Global temporary tables

diff --git a/contrib/pg_buffercache/pg_buffercache_pages.c b/contrib/pg_buffercache/pg_buffercache_pages.c
index 1bd579f..2d93f6f 100644
--- a/contrib/pg_buffercache/pg_buffercache_pages.c
+++ b/contrib/pg_buffercache/pg_buffercache_pages.c
@@ -153,9 +153,9 @@ pg_buffercache_pages(PG_FUNCTION_ARGS)
 			buf_state = LockBufHdr(bufHdr);
 
 			fctx->record[i].bufferid = BufferDescriptorGetBuffer(bufHdr);
-			fctx->record[i].relfilenode = bufHdr->tag.rnode.relNode;
-			fctx->record[i].reltablespace = bufHdr->tag.rnode.spcNode;
-			fctx->record[i].reldatabase = bufHdr->tag.rnode.dbNode;
+			fctx->record[i].relfilenode = bufHdr->tag.rnode.node.relNode;
+			fctx->record[i].reltablespace = bufHdr->tag.rnode.node.spcNode;
+			fctx->record[i].reldatabase = bufHdr->tag.rnode.node.dbNode;
 			fctx->record[i].forknum = bufHdr->tag.forkNum;
 			fctx->record[i].blocknum = bufHdr->tag.blockNum;
 			fctx->record[i].usagecount = BUF_STATE_GET_USAGECOUNT(buf_state);
diff --git a/contrib/pg_prewarm/autoprewarm.c b/contrib/pg_prewarm/autoprewarm.c
index 38ae240..8a04954 100644
--- a/contrib/pg_prewarm/autoprewarm.c
+++ b/contrib/pg_prewarm/autoprewarm.c
@@ -608,9 +608,9 @@ apw_dump_now(bool is_bgworker, bool dump_unlogged)
 		if (buf_state & BM_TAG_VALID &&
 			((buf_state & BM_PERMANENT) || dump_unlogged))
 		{
-			block_info_array[num_blocks].database = bufHdr->tag.rnode.dbNode;
-			block_info_array[num_blocks].tablespace = bufHdr->tag.rnode.spcNode;
-			block_info_array[num_blocks].filenode = bufHdr->tag.rnode.relNode;
+			block_info_array[num_blocks].database = bufHdr->tag.rnode.node.dbNode;
+			block_info_array[num_blocks].tablespace = bufHdr->tag.rnode.node.spcNode;
+			block_info_array[num_blocks].filenode = bufHdr->tag.rnode.node.relNode;
 			block_info_array[num_blocks].forknum = bufHdr->tag.forkNum;
 			block_info_array[num_blocks].blocknum = bufHdr->tag.blockNum;
 			++num_blocks;
diff --git a/src/backend/access/gin/ginxlog.c b/src/backend/access/gin/ginxlog.c
index c945b28..14d4e48 100644
--- a/src/backend/access/gin/ginxlog.c
+++ b/src/backend/access/gin/ginxlog.c
@@ -95,13 +95,13 @@ ginRedoInsertEntry(Buffer buffer, bool isLeaf, BlockNumber rightblkno, void *rda
 
 	if (PageAddItem(page, (Item) itup, IndexTupleSize(itup), offset, false, false) == InvalidOffsetNumber)
 	{
-		RelFileNode node;
+		RelFileNodeBackend rnode;
 		ForkNumber	forknum;
 		BlockNumber blknum;
 
-		BufferGetTag(buffer, &node, &forknum, &blknum);
+		BufferGetTag(buffer, &rnode, &forknum, &blknum);
 		elog(ERROR, "failed to add item to index page in %u/%u/%u",
-			 node.spcNode, node.dbNode, node.relNode);
+			 rnode.node.spcNode, rnode.node.dbNode, rnode.node.relNode);
 	}
 }
 
diff --git a/src/backend/access/heap/heapam_handler.c b/src/backend/access/heap/heapam_handler.c
index 09bc6fe..c60effd 100644
--- a/src/backend/access/heap/heapam_handler.c
+++ b/src/backend/access/heap/heapam_handler.c
@@ -671,6 +671,7 @@ heapam_relation_copy_data(Relation rel, const RelFileNode *newrnode)
 			 * init fork of an unlogged relation.
 			 */
 			if (rel->rd_rel->relpersistence == RELPERSISTENCE_PERMANENT ||
+				rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ||
 				(rel->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED &&
 				 forkNum == INIT_FORKNUM))
 				log_smgrcreate(newrnode, forkNum);
diff --git a/src/backend/access/nbtree/nbtpage.c b/src/backend/access/nbtree/nbtpage.c
index 5962126..60f4696 100644
--- a/src/backend/access/nbtree/nbtpage.c
+++ b/src/backend/access/nbtree/nbtpage.c
@@ -763,7 +763,11 @@ _bt_getbuf(Relation rel, BlockNumber blkno, int access)
 		/* Read an existing block of the relation */
 		buf = ReadBuffer(rel, blkno);
 		LockBuffer(buf, access);
-		_bt_checkpage(rel, buf);
+		/* Session temporary relation may be not yet initialized for this backend. */
+		if (blkno == BTREE_METAPAGE && PageIsNew(BufferGetPage(buf)) && IsSessionRelationBackendId(rel->rd_backend))
+			_bt_initmetapage(BufferGetPage(buf), P_NONE, 0);
+		else
+			_bt_checkpage(rel, buf);
 	}
 	else
 	{
diff --git a/src/backend/access/transam/xloginsert.c b/src/backend/access/transam/xloginsert.c
index 3ec67d4..edec8ca 100644
--- a/src/backend/access/transam/xloginsert.c
+++ b/src/backend/access/transam/xloginsert.c
@@ -213,6 +213,7 @@ void
 XLogRegisterBuffer(uint8 block_id, Buffer buffer, uint8 flags)
 {
 	registered_buffer *regbuf;
+	RelFileNodeBackend rnode;
 
 	/* NO_IMAGE doesn't make sense with FORCE_IMAGE */
 	Assert(!((flags & REGBUF_FORCE_IMAGE) && (flags & (REGBUF_NO_IMAGE))));
@@ -227,7 +228,8 @@ XLogRegisterBuffer(uint8 block_id, Buffer buffer, uint8 flags)
 
 	regbuf = &registered_buffers[block_id];
 
-	BufferGetTag(buffer, &regbuf->rnode, &regbuf->forkno, &regbuf->block);
+	BufferGetTag(buffer, &rnode, &regbuf->forkno, &regbuf->block);
+	regbuf->rnode = rnode.node;
 	regbuf->page = BufferGetPage(buffer);
 	regbuf->flags = flags;
 	regbuf->rdata_tail = (XLogRecData *) &regbuf->rdata_head;
@@ -919,7 +921,7 @@ XLogSaveBufferForHint(Buffer buffer, bool buffer_std)
 		int			flags;
 		PGAlignedBlock copied_buffer;
 		char	   *origdata = (char *) BufferGetBlock(buffer);
-		RelFileNode rnode;
+		RelFileNodeBackend rnode;
 		ForkNumber	forkno;
 		BlockNumber blkno;
 
@@ -948,7 +950,7 @@ XLogSaveBufferForHint(Buffer buffer, bool buffer_std)
 			flags |= REGBUF_STANDARD;
 
 		BufferGetTag(buffer, &rnode, &forkno, &blkno);
-		XLogRegisterBlock(0, &rnode, forkno, blkno, copied_buffer.data, flags);
+		XLogRegisterBlock(0, &rnode.node, forkno, blkno, copied_buffer.data, flags);
 
 		recptr = XLogInsert(RM_XLOG_ID, XLOG_FPI_FOR_HINT);
 	}
@@ -1009,7 +1011,7 @@ XLogRecPtr
 log_newpage_buffer(Buffer buffer, bool page_std)
 {
 	Page		page = BufferGetPage(buffer);
-	RelFileNode rnode;
+	RelFileNodeBackend rnode;
 	ForkNumber	forkNum;
 	BlockNumber blkno;
 
@@ -1018,7 +1020,7 @@ log_newpage_buffer(Buffer buffer, bool page_std)
 
 	BufferGetTag(buffer, &rnode, &forkNum, &blkno);
 
-	return log_newpage(&rnode, forkNum, blkno, page, page_std);
+	return log_newpage(&rnode.node, forkNum, blkno, page, page_std);
 }
 
 /*
diff --git a/src/backend/catalog/catalog.c b/src/backend/catalog/catalog.c
index a065419..8814afb 100644
--- a/src/backend/catalog/catalog.c
+++ b/src/backend/catalog/catalog.c
@@ -409,6 +409,9 @@ GetNewRelFileNode(Oid reltablespace, Relation pg_class, char relpersistence)
 		case RELPERSISTENCE_TEMP:
 			backend = BackendIdForTempRelations();
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 99ae159..24b2438 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3612,7 +3612,7 @@ reindex_relation(Oid relid, int flags, int options)
 		if (flags & REINDEX_REL_FORCE_INDEXES_UNLOGGED)
 			persistence = RELPERSISTENCE_UNLOGGED;
 		else if (flags & REINDEX_REL_FORCE_INDEXES_PERMANENT)
-			persistence = RELPERSISTENCE_PERMANENT;
+			persistence = rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ? RELPERSISTENCE_SESSION : RELPERSISTENCE_PERMANENT;
 		else
 			persistence = rel->rd_rel->relpersistence;
 
diff --git a/src/backend/catalog/storage.c b/src/backend/catalog/storage.c
index 3cc886f..a111ddc 100644
--- a/src/backend/catalog/storage.c
+++ b/src/backend/catalog/storage.c
@@ -93,6 +93,10 @@ RelationCreateStorage(RelFileNode rnode, char relpersistence)
 			backend = InvalidBackendId;
 			needs_wal = false;
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			needs_wal = false;
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
 			needs_wal = true;
diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index cedb4ee..d11c5b3 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -1400,7 +1400,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap,
 	 */
 	if (newrelpersistence == RELPERSISTENCE_UNLOGGED)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_UNLOGGED;
-	else if (newrelpersistence == RELPERSISTENCE_PERMANENT)
+	else if (newrelpersistence != RELPERSISTENCE_TEMP)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_PERMANENT;
 
 	/* Report that we are now reindexing relations */
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index fb2be10..372c9a5 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -7678,6 +7678,12 @@ ATAddForeignKeyConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
 						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 						 errmsg("constraints on unlogged tables may reference only permanent or unlogged tables")));
 			break;
+		case RELPERSISTENCE_SESSION:
+			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
+				ereport(ERROR,
+						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+						 errmsg("constraints on session tables may reference only session tables")));
+			break;
 		case RELPERSISTENCE_TEMP:
 			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_TEMP)
 				ereport(ERROR,
@@ -14082,6 +14088,13 @@ ATPrepChangePersistence(Relation rel, bool toLogged)
 							RelationGetRelationName(rel)),
 					 errtable(rel)));
 			break;
+		case RELPERSISTENCE_SESSION:
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+					 errmsg("cannot change logged status of session table \"%s\"",
+							RelationGetRelationName(rel)),
+					 errtable(rel)));
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			if (toLogged)
 				/* nothing to do */
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index c97bb36..f9b2000 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -3265,20 +3265,11 @@ OptTemp:	TEMPORARY					{ $$ = RELPERSISTENCE_TEMP; }
 			| TEMP						{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMPORARY			{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMP				{ $$ = RELPERSISTENCE_TEMP; }
-			| GLOBAL TEMPORARY
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
-			| GLOBAL TEMP
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
+			| GLOBAL TEMPORARY          { $$ = RELPERSISTENCE_SESSION; }
+			| GLOBAL TEMP               { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION                   { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMPORARY         { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMP              { $$ = RELPERSISTENCE_SESSION; }
 			| UNLOGGED					{ $$ = RELPERSISTENCE_UNLOGGED; }
 			| /*EMPTY*/					{ $$ = RELPERSISTENCE_PERMANENT; }
 		;
diff --git a/src/backend/replication/logical/reorderbuffer.c b/src/backend/replication/logical/reorderbuffer.c
index e8ffa04..2004d2f 100644
--- a/src/backend/replication/logical/reorderbuffer.c
+++ b/src/backend/replication/logical/reorderbuffer.c
@@ -3483,6 +3483,7 @@ ResolveCminCmaxDuringDecoding(HTAB *tuplecid_data,
 {
 	ReorderBufferTupleCidKey key;
 	ReorderBufferTupleCidEnt *ent;
+	RelFileNodeBackend rnode;
 	ForkNumber	forkno;
 	BlockNumber blockno;
 	bool		updated_mapping = false;
@@ -3496,7 +3497,8 @@ ResolveCminCmaxDuringDecoding(HTAB *tuplecid_data,
 	 * get relfilenode from the buffer, no convenient way to access it other
 	 * than that.
 	 */
-	BufferGetTag(buffer, &key.relnode, &forkno, &blockno);
+	BufferGetTag(buffer, &rnode, &forkno, &blockno);
+	key.relnode = rnode.node;
 
 	/* tuples can only be in the main fork */
 	Assert(forkno == MAIN_FORKNUM);
diff --git a/src/backend/storage/buffer/bufmgr.c b/src/backend/storage/buffer/bufmgr.c
index 6f3a402..76ce953 100644
--- a/src/backend/storage/buffer/bufmgr.c
+++ b/src/backend/storage/buffer/bufmgr.c
@@ -556,7 +556,7 @@ PrefetchBuffer(Relation reln, ForkNumber forkNum, BlockNumber blockNum)
 		int			buf_id;
 
 		/* create a tag so we can lookup the buffer */
-		INIT_BUFFERTAG(newTag, reln->rd_smgr->smgr_rnode.node,
+		INIT_BUFFERTAG(newTag, reln->rd_smgr->smgr_rnode,
 					   forkNum, blockNum);
 
 		/* determine its hash code and partition lock ID */
@@ -710,7 +710,7 @@ ReadBuffer_common(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
 	Block		bufBlock;
 	bool		found;
 	bool		isExtend;
-	bool		isLocalBuf = SmgrIsTemp(smgr);
+	bool		isLocalBuf = SmgrIsTemp(smgr) && relpersistence == RELPERSISTENCE_TEMP;
 
 	*hit = false;
 
@@ -1010,7 +1010,7 @@ BufferAlloc(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
 	uint32		buf_state;
 
 	/* create a tag so we can lookup the buffer */
-	INIT_BUFFERTAG(newTag, smgr->smgr_rnode.node, forkNum, blockNum);
+	INIT_BUFFERTAG(newTag, smgr->smgr_rnode, forkNum, blockNum);
 
 	/* determine its hash code and partition lock ID */
 	newHash = BufTableHashCode(&newTag);
@@ -1532,7 +1532,8 @@ ReleaseAndReadBuffer(Buffer buffer,
 		{
 			bufHdr = GetLocalBufferDescriptor(-buffer - 1);
 			if (bufHdr->tag.blockNum == blockNum &&
-				RelFileNodeEquals(bufHdr->tag.rnode, relation->rd_node) &&
+				RelFileNodeEquals(bufHdr->tag.rnode.node, relation->rd_node) &&
+				bufHdr->tag.rnode.backend == relation->rd_backend &&
 				bufHdr->tag.forkNum == forkNum)
 				return buffer;
 			ResourceOwnerForgetBuffer(CurrentResourceOwner, buffer);
@@ -1543,7 +1544,8 @@ ReleaseAndReadBuffer(Buffer buffer,
 			bufHdr = GetBufferDescriptor(buffer - 1);
 			/* we have pin, so it's ok to examine tag without spinlock */
 			if (bufHdr->tag.blockNum == blockNum &&
-				RelFileNodeEquals(bufHdr->tag.rnode, relation->rd_node) &&
+				RelFileNodeEquals(bufHdr->tag.rnode.node, relation->rd_node) &&
+				bufHdr->tag.rnode.backend == relation->rd_backend &&
 				bufHdr->tag.forkNum == forkNum)
 				return buffer;
 			UnpinBuffer(bufHdr, true);
@@ -1845,8 +1847,8 @@ BufferSync(int flags)
 
 			item = &CkptBufferIds[num_to_scan++];
 			item->buf_id = buf_id;
-			item->tsId = bufHdr->tag.rnode.spcNode;
-			item->relNode = bufHdr->tag.rnode.relNode;
+			item->tsId = bufHdr->tag.rnode.node.spcNode;
+			item->relNode = bufHdr->tag.rnode.node.relNode;
 			item->forkNum = bufHdr->tag.forkNum;
 			item->blockNum = bufHdr->tag.blockNum;
 		}
@@ -2559,7 +2561,7 @@ PrintBufferLeakWarning(Buffer buffer)
 	}
 
 	/* theoretically we should lock the bufhdr here */
-	path = relpathbackend(buf->tag.rnode, backend, buf->tag.forkNum);
+	path = relpathbackend(buf->tag.rnode.node, backend, buf->tag.forkNum);
 	buf_state = pg_atomic_read_u32(&buf->state);
 	elog(WARNING,
 		 "buffer refcount leak: [%03d] "
@@ -2631,7 +2633,7 @@ BufferGetBlockNumber(Buffer buffer)
  *		a buffer.
  */
 void
-BufferGetTag(Buffer buffer, RelFileNode *rnode, ForkNumber *forknum,
+BufferGetTag(Buffer buffer, RelFileNodeBackend *rnode, ForkNumber *forknum,
 			 BlockNumber *blknum)
 {
 	BufferDesc *bufHdr;
@@ -2696,7 +2698,7 @@ FlushBuffer(BufferDesc *buf, SMgrRelation reln)
 
 	/* Find smgr relation for buffer */
 	if (reln == NULL)
-		reln = smgropen(buf->tag.rnode, InvalidBackendId);
+		reln = smgropen(buf->tag.rnode.node, buf->tag.rnode.backend);
 
 	TRACE_POSTGRESQL_BUFFER_FLUSH_START(buf->tag.forkNum,
 										buf->tag.blockNum,
@@ -2930,7 +2932,7 @@ DropRelFileNodeBuffers(RelFileNodeBackend rnode, ForkNumber forkNum,
 	int			i;
 
 	/* If it's a local relation, it's localbuf.c's problem. */
-	if (RelFileNodeBackendIsTemp(rnode))
+	if (RelFileNodeBackendIsLocalTemp(rnode))
 	{
 		if (rnode.backend == MyBackendId)
 			DropRelFileNodeLocalBuffers(rnode.node, forkNum, firstDelBlock);
@@ -2958,11 +2960,11 @@ DropRelFileNodeBuffers(RelFileNodeBackend rnode, ForkNumber forkNum,
 		 * We could check forkNum and blockNum as well as the rnode, but the
 		 * incremental win from doing so seems small.
 		 */
-		if (!RelFileNodeEquals(bufHdr->tag.rnode, rnode.node))
+		if (!RelFileNodeBackendEquals(bufHdr->tag.rnode, rnode))
 			continue;
 
 		buf_state = LockBufHdr(bufHdr);
-		if (RelFileNodeEquals(bufHdr->tag.rnode, rnode.node) &&
+		if (RelFileNodeBackendEquals(bufHdr->tag.rnode, rnode) &&
 			bufHdr->tag.forkNum == forkNum &&
 			bufHdr->tag.blockNum >= firstDelBlock)
 			InvalidateBuffer(bufHdr);	/* releases spinlock */
@@ -2985,24 +2987,24 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 {
 	int			i,
 				n = 0;
-	RelFileNode *nodes;
+	RelFileNodeBackend *nodes;
 	bool		use_bsearch;
 
 	if (nnodes == 0)
 		return;
 
-	nodes = palloc(sizeof(RelFileNode) * nnodes);	/* non-local relations */
+	nodes = palloc(sizeof(RelFileNodeBackend) * nnodes);	/* non-local relations */
 
 	/* If it's a local relation, it's localbuf.c's problem. */
 	for (i = 0; i < nnodes; i++)
 	{
-		if (RelFileNodeBackendIsTemp(rnodes[i]))
+		if (RelFileNodeBackendIsLocalTemp(rnodes[i]))
 		{
 			if (rnodes[i].backend == MyBackendId)
 				DropRelFileNodeAllLocalBuffers(rnodes[i].node);
 		}
 		else
-			nodes[n++] = rnodes[i].node;
+			nodes[n++] = rnodes[i];
 	}
 
 	/*
@@ -3025,11 +3027,11 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 
 	/* sort the list of rnodes if necessary */
 	if (use_bsearch)
-		pg_qsort(nodes, n, sizeof(RelFileNode), rnode_comparator);
+		pg_qsort(nodes, n, sizeof(RelFileNodeBackend), rnode_comparator);
 
 	for (i = 0; i < NBuffers; i++)
 	{
-		RelFileNode *rnode = NULL;
+		RelFileNodeBackend *rnode = NULL;
 		BufferDesc *bufHdr = GetBufferDescriptor(i);
 		uint32		buf_state;
 
@@ -3044,7 +3046,7 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 
 			for (j = 0; j < n; j++)
 			{
-				if (RelFileNodeEquals(bufHdr->tag.rnode, nodes[j]))
+				if (RelFileNodeBackendEquals(bufHdr->tag.rnode, nodes[j]))
 				{
 					rnode = &nodes[j];
 					break;
@@ -3054,7 +3056,7 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 		else
 		{
 			rnode = bsearch((const void *) &(bufHdr->tag.rnode),
-							nodes, n, sizeof(RelFileNode),
+							nodes, n, sizeof(RelFileNodeBackend),
 							rnode_comparator);
 		}
 
@@ -3063,7 +3065,7 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 			continue;
 
 		buf_state = LockBufHdr(bufHdr);
-		if (RelFileNodeEquals(bufHdr->tag.rnode, (*rnode)))
+		if (RelFileNodeBackendEquals(bufHdr->tag.rnode, (*rnode)))
 			InvalidateBuffer(bufHdr);	/* releases spinlock */
 		else
 			UnlockBufHdr(bufHdr, buf_state);
@@ -3102,11 +3104,11 @@ DropDatabaseBuffers(Oid dbid)
 		 * As in DropRelFileNodeBuffers, an unlocked precheck should be safe
 		 * and saves some cycles.
 		 */
-		if (bufHdr->tag.rnode.dbNode != dbid)
+		if (bufHdr->tag.rnode.node.dbNode != dbid)
 			continue;
 
 		buf_state = LockBufHdr(bufHdr);
-		if (bufHdr->tag.rnode.dbNode == dbid)
+		if (bufHdr->tag.rnode.node.dbNode == dbid)
 			InvalidateBuffer(bufHdr);	/* releases spinlock */
 		else
 			UnlockBufHdr(bufHdr, buf_state);
@@ -3136,7 +3138,7 @@ PrintBufferDescs(void)
 			 "[%02d] (freeNext=%d, rel=%s, "
 			 "blockNum=%u, flags=0x%x, refcount=%u %d)",
 			 i, buf->freeNext,
-			 relpathbackend(buf->tag.rnode, InvalidBackendId, buf->tag.forkNum),
+			 relpath(buf->tag.rnode, buf->tag.forkNum),
 			 buf->tag.blockNum, buf->flags,
 			 buf->refcount, GetPrivateRefCount(b));
 	}
@@ -3204,7 +3206,8 @@ FlushRelationBuffers(Relation rel)
 			uint32		buf_state;
 
 			bufHdr = GetLocalBufferDescriptor(i);
-			if (RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node) &&
+			if (RelFileNodeEquals(bufHdr->tag.rnode.node, rel->rd_node) &&
+				bufHdr->tag.rnode.backend == rel->rd_backend &&
 				((buf_state = pg_atomic_read_u32(&bufHdr->state)) &
 				 (BM_VALID | BM_DIRTY)) == (BM_VALID | BM_DIRTY))
 			{
@@ -3251,13 +3254,15 @@ FlushRelationBuffers(Relation rel)
 		 * As in DropRelFileNodeBuffers, an unlocked precheck should be safe
 		 * and saves some cycles.
 		 */
-		if (!RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node))
+		if (!RelFileNodeEquals(bufHdr->tag.rnode.node, rel->rd_node)
+			|| bufHdr->tag.rnode.backend != rel->rd_backend)
 			continue;
 
 		ReservePrivateRefCountEntry();
 
 		buf_state = LockBufHdr(bufHdr);
-		if (RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node) &&
+		if (RelFileNodeEquals(bufHdr->tag.rnode.node, rel->rd_node) &&
+			bufHdr->tag.rnode.backend == rel->rd_backend &&
 			(buf_state & (BM_VALID | BM_DIRTY)) == (BM_VALID | BM_DIRTY))
 		{
 			PinBuffer_Locked(bufHdr);
@@ -3305,13 +3310,13 @@ FlushDatabaseBuffers(Oid dbid)
 		 * As in DropRelFileNodeBuffers, an unlocked precheck should be safe
 		 * and saves some cycles.
 		 */
-		if (bufHdr->tag.rnode.dbNode != dbid)
+		if (bufHdr->tag.rnode.node.dbNode != dbid)
 			continue;
 
 		ReservePrivateRefCountEntry();
 
 		buf_state = LockBufHdr(bufHdr);
-		if (bufHdr->tag.rnode.dbNode == dbid &&
+		if (bufHdr->tag.rnode.node.dbNode == dbid &&
 			(buf_state & (BM_VALID | BM_DIRTY)) == (BM_VALID | BM_DIRTY))
 		{
 			PinBuffer_Locked(bufHdr);
@@ -4051,7 +4056,7 @@ AbortBufferIO(void)
 				/* Buffer is pinned, so we can read tag without spinlock */
 				char	   *path;
 
-				path = relpathperm(buf->tag.rnode, buf->tag.forkNum);
+				path = relpath(buf->tag.rnode, buf->tag.forkNum);
 				ereport(WARNING,
 						(errcode(ERRCODE_IO_ERROR),
 						 errmsg("could not write block %u of %s",
@@ -4075,7 +4080,7 @@ shared_buffer_write_error_callback(void *arg)
 	/* Buffer is pinned, so we can read the tag without locking the spinlock */
 	if (bufHdr != NULL)
 	{
-		char	   *path = relpathperm(bufHdr->tag.rnode, bufHdr->tag.forkNum);
+		char	   *path = relpath(bufHdr->tag.rnode, bufHdr->tag.forkNum);
 
 		errcontext("writing block %u of relation %s",
 				   bufHdr->tag.blockNum, path);
@@ -4093,7 +4098,7 @@ local_buffer_write_error_callback(void *arg)
 
 	if (bufHdr != NULL)
 	{
-		char	   *path = relpathbackend(bufHdr->tag.rnode, MyBackendId,
+		char	   *path = relpathbackend(bufHdr->tag.rnode.node, MyBackendId,
 										  bufHdr->tag.forkNum);
 
 		errcontext("writing block %u of relation %s",
@@ -4108,22 +4113,27 @@ local_buffer_write_error_callback(void *arg)
 static int
 rnode_comparator(const void *p1, const void *p2)
 {
-	RelFileNode n1 = *(const RelFileNode *) p1;
-	RelFileNode n2 = *(const RelFileNode *) p2;
+	RelFileNodeBackend n1 = *(const RelFileNodeBackend *) p1;
+	RelFileNodeBackend n2 = *(const RelFileNodeBackend *) p2;
 
-	if (n1.relNode < n2.relNode)
+	if (n1.node.relNode < n2.node.relNode)
 		return -1;
-	else if (n1.relNode > n2.relNode)
+	else if (n1.node.relNode > n2.node.relNode)
 		return 1;
 
-	if (n1.dbNode < n2.dbNode)
+	if (n1.node.dbNode < n2.node.dbNode)
 		return -1;
-	else if (n1.dbNode > n2.dbNode)
+	else if (n1.node.dbNode > n2.node.dbNode)
 		return 1;
 
-	if (n1.spcNode < n2.spcNode)
+	if (n1.node.spcNode < n2.node.spcNode)
 		return -1;
-	else if (n1.spcNode > n2.spcNode)
+	else if (n1.node.spcNode > n2.node.spcNode)
+		return 1;
+
+	if (n1.backend < n2.backend)
+		return -1;
+	else if (n1.backend > n2.backend)
 		return 1;
 	else
 		return 0;
@@ -4359,7 +4369,7 @@ IssuePendingWritebacks(WritebackContext *context)
 			next = &context->pending_writebacks[i + ahead + 1];
 
 			/* different file, stop */
-			if (!RelFileNodeEquals(cur->tag.rnode, next->tag.rnode) ||
+			if (!RelFileNodeBackendEquals(cur->tag.rnode, next->tag.rnode) ||
 				cur->tag.forkNum != next->tag.forkNum)
 				break;
 
@@ -4378,7 +4388,7 @@ IssuePendingWritebacks(WritebackContext *context)
 		i += ahead;
 
 		/* and finally tell the kernel to write the data to storage */
-		reln = smgropen(tag.rnode, InvalidBackendId);
+		reln = smgropen(tag.rnode.node, tag.rnode.backend);
 		smgrwriteback(reln, tag.forkNum, tag.blockNum, nblocks);
 	}
 
diff --git a/src/backend/storage/buffer/localbuf.c b/src/backend/storage/buffer/localbuf.c
index f5f6a29..6bd5ecb 100644
--- a/src/backend/storage/buffer/localbuf.c
+++ b/src/backend/storage/buffer/localbuf.c
@@ -68,7 +68,7 @@ LocalPrefetchBuffer(SMgrRelation smgr, ForkNumber forkNum,
 	BufferTag	newTag;			/* identity of requested block */
 	LocalBufferLookupEnt *hresult;
 
-	INIT_BUFFERTAG(newTag, smgr->smgr_rnode.node, forkNum, blockNum);
+	INIT_BUFFERTAG(newTag, smgr->smgr_rnode, forkNum, blockNum);
 
 	/* Initialize local buffers if first request in this session */
 	if (LocalBufHash == NULL)
@@ -111,7 +111,7 @@ LocalBufferAlloc(SMgrRelation smgr, ForkNumber forkNum, BlockNumber blockNum,
 	bool		found;
 	uint32		buf_state;
 
-	INIT_BUFFERTAG(newTag, smgr->smgr_rnode.node, forkNum, blockNum);
+	INIT_BUFFERTAG(newTag, smgr->smgr_rnode, forkNum, blockNum);
 
 	/* Initialize local buffers if first request in this session */
 	if (LocalBufHash == NULL)
@@ -209,7 +209,7 @@ LocalBufferAlloc(SMgrRelation smgr, ForkNumber forkNum, BlockNumber blockNum,
 		Page		localpage = (char *) LocalBufHdrGetBlock(bufHdr);
 
 		/* Find smgr relation for buffer */
-		oreln = smgropen(bufHdr->tag.rnode, MyBackendId);
+		oreln = smgropen(bufHdr->tag.rnode.node, MyBackendId);
 
 		PageSetChecksumInplace(localpage, bufHdr->tag.blockNum);
 
@@ -331,14 +331,14 @@ DropRelFileNodeLocalBuffers(RelFileNode rnode, ForkNumber forkNum,
 		buf_state = pg_atomic_read_u32(&bufHdr->state);
 
 		if ((buf_state & BM_TAG_VALID) &&
-			RelFileNodeEquals(bufHdr->tag.rnode, rnode) &&
+			RelFileNodeEquals(bufHdr->tag.rnode.node, rnode) &&
 			bufHdr->tag.forkNum == forkNum &&
 			bufHdr->tag.blockNum >= firstDelBlock)
 		{
 			if (LocalRefCount[i] != 0)
 				elog(ERROR, "block %u of %s is still referenced (local %u)",
 					 bufHdr->tag.blockNum,
-					 relpathbackend(bufHdr->tag.rnode, MyBackendId,
+					 relpathbackend(bufHdr->tag.rnode.node, MyBackendId,
 									bufHdr->tag.forkNum),
 					 LocalRefCount[i]);
 			/* Remove entry from hashtable */
@@ -377,12 +377,12 @@ DropRelFileNodeAllLocalBuffers(RelFileNode rnode)
 		buf_state = pg_atomic_read_u32(&bufHdr->state);
 
 		if ((buf_state & BM_TAG_VALID) &&
-			RelFileNodeEquals(bufHdr->tag.rnode, rnode))
+			RelFileNodeEquals(bufHdr->tag.rnode.node, rnode))
 		{
 			if (LocalRefCount[i] != 0)
 				elog(ERROR, "block %u of %s is still referenced (local %u)",
 					 bufHdr->tag.blockNum,
-					 relpathbackend(bufHdr->tag.rnode, MyBackendId,
+					 relpathbackend(bufHdr->tag.rnode.node, MyBackendId,
 									bufHdr->tag.forkNum),
 					 LocalRefCount[i]);
 			/* Remove entry from hashtable */
diff --git a/src/backend/storage/freespace/fsmpage.c b/src/backend/storage/freespace/fsmpage.c
index cf7f03f..65eb422 100644
--- a/src/backend/storage/freespace/fsmpage.c
+++ b/src/backend/storage/freespace/fsmpage.c
@@ -268,13 +268,13 @@ restart:
 			 *
 			 * Fix the corruption and restart.
 			 */
-			RelFileNode rnode;
+			RelFileNodeBackend rnode;
 			ForkNumber	forknum;
 			BlockNumber blknum;
 
 			BufferGetTag(buf, &rnode, &forknum, &blknum);
 			elog(DEBUG1, "fixing corrupt FSM block %u, relation %u/%u/%u",
-				 blknum, rnode.spcNode, rnode.dbNode, rnode.relNode);
+				 blknum, rnode.node.spcNode, rnode.node.dbNode, rnode.node.relNode);
 
 			/* make sure we hold an exclusive lock */
 			if (!exclusive_lock_held)
diff --git a/src/backend/storage/smgr/md.c b/src/backend/storage/smgr/md.c
index 07f3c93..204c4cb 100644
--- a/src/backend/storage/smgr/md.c
+++ b/src/backend/storage/smgr/md.c
@@ -33,6 +33,7 @@
 #include "postmaster/bgwriter.h"
 #include "storage/fd.h"
 #include "storage/bufmgr.h"
+#include "storage/ipc.h"
 #include "storage/md.h"
 #include "storage/relfilenode.h"
 #include "storage/smgr.h"
@@ -87,6 +88,18 @@ typedef struct _MdfdVec
 
 static MemoryContext MdCxt;		/* context for all MdfdVec objects */
 
+/*
+ * Structure used to collect information created by this backend.
+ * Data of this related should be deleted on backend exit.
+ */
+typedef struct SessionRelation
+{
+	RelFileNodeBackend rnode;
+	struct SessionRelation* next;
+} SessionRelation;
+
+
+static SessionRelation* SessionRelations;
 
 /* Populate a file tag describing an md.c segment file. */
 #define INIT_MD_FILETAG(a,xx_rnode,xx_forknum,xx_segno) \
@@ -152,6 +165,48 @@ mdinit(void)
 								  ALLOCSET_DEFAULT_SIZES);
 }
 
+
+/*
+ * Delete all data of session relations and remove their pages from shared buffers.
+ * This function is called on backend exit.
+ */
+static void
+TruncateSessionRelations(int code, Datum arg)
+{
+	SessionRelation* rel;
+	for (rel = SessionRelations; rel != NULL; rel = rel->next)
+	{
+		/* Remove relation pages from shared buffers */
+		DropRelFileNodesAllBuffers(&rel->rnode, 1);
+
+		/* Delete relation files */
+		mdunlink(rel->rnode, InvalidForkNumber, false);
+	}
+}
+
+/*
+ * Maintain information about session relations accessed by this backend.
+ * This list is needed to perform cleanup on backend exit.
+ * Session relation is linked in this list when this relation is created or opened and file doesn't exist.
+ * Such procedure guarantee that each relation is linked into list only once.
+ */
+static void
+RegisterSessionRelation(SMgrRelation reln)
+{
+	SessionRelation* rel = (SessionRelation*)MemoryContextAlloc(TopMemoryContext, sizeof(SessionRelation));
+
+	/*
+	 * Perform session relation cleanup on backend exit. We are using shared memory hook, because
+	 * cleanup should be performed before backend is disconnected from shared memory.
+	 */
+	if (SessionRelations == NULL)
+		on_shmem_exit(TruncateSessionRelations, 0);
+
+	rel->rnode = reln->smgr_rnode;
+	rel->next = SessionRelations;
+	SessionRelations = rel;
+}
+
 /*
  *	mdexists() -- Does the physical file exist?
  *
@@ -218,6 +273,8 @@ mdcreate(SMgrRelation reln, ForkNumber forkNum, bool isRedo)
 					 errmsg("could not create file \"%s\": %m", path)));
 		}
 	}
+	if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		RegisterSessionRelation(reln);
 
 	pfree(path);
 
@@ -465,6 +522,19 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 
 	if (fd < 0)
 	{
+		/*
+		 * In case of session relation access, there may be no yet files of this relation for this backend.
+		 * If so, then create file and register session relation for truncation on backend exit.
+		 */
+		if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
+			fd = PathNameOpenFile(path, O_RDWR | PG_BINARY | O_CREAT);
+			if (fd >= 0)
+			{
+				RegisterSessionRelation(reln);
+				goto NewSegment;
+			}
+		}
 		if ((behavior & EXTENSION_RETURN_NULL) &&
 			FILE_POSSIBLY_DELETED(errno))
 		{
@@ -476,6 +546,7 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 				 errmsg("could not open file \"%s\": %m", path)));
 	}
 
+  NewSegment:
 	pfree(path);
 
 	_fdvec_resize(reln, forknum, 1);
@@ -652,8 +723,13 @@ mdread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
 		 * complaining.  This allows, for example, the case of trying to
 		 * update a block that was later truncated away.
 		 */
-		if (zero_damaged_pages || InRecovery)
+		if (zero_damaged_pages || InRecovery || RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
 			MemSet(buffer, 0, BLCKSZ);
+			/* In case of session relation we need to write zero page to provide correct result of subsequent mdnblocks */
+			if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+				mdwrite(reln, forknum, blocknum, buffer, true);
+		}
 		else
 			ereport(ERROR,
 					(errcode(ERRCODE_DATA_CORRUPTED),
@@ -738,12 +814,18 @@ mdwrite(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
 BlockNumber
 mdnblocks(SMgrRelation reln, ForkNumber forknum)
 {
-	MdfdVec    *v = mdopenfork(reln, forknum, EXTENSION_FAIL);
+	/*
+	 * If we access session relation, there may be no files yet of this relation for this backend.
+	 * Pass EXTENSION_RETURN_NULL to make mdopen return NULL in this case instead of reporting error.
+	 */
+	MdfdVec    *v = mdopenfork(reln, forknum, RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode)
+							   ? EXTENSION_RETURN_NULL : EXTENSION_FAIL);
 	BlockNumber nblocks;
 	BlockNumber segno = 0;
 
 	/* mdopen has opened the first segment */
-	Assert(reln->md_num_open_segs[forknum] > 0);
+	if (reln->md_num_open_segs[forknum] == 0)
+		return 0;
 
 	/*
 	 * Start from the last open segments, to avoid redundant seeks.  We have
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index a87e721..2401361 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -994,6 +994,9 @@ pg_relation_filepath(PG_FUNCTION_ARGS)
 	/* Determine owning backend. */
 	switch (relform->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c
index 2488607..86e8fca 100644
--- a/src/backend/utils/cache/relcache.c
+++ b/src/backend/utils/cache/relcache.c
@@ -1098,6 +1098,10 @@ RelationBuildDesc(Oid targetRelId, bool insertIt)
 	relation->rd_newRelfilenodeSubid = InvalidSubTransactionId;
 	switch (relation->rd_rel->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			relation->rd_backend = BackendIdForSessionRelations();
+			relation->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			relation->rd_backend = InvalidBackendId;
@@ -3301,6 +3305,10 @@ RelationBuildLocalRelation(const char *relname,
 	rel->rd_rel->relpersistence = relpersistence;
 	switch (relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			rel->rd_backend = BackendIdForSessionRelations();
+			rel->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			rel->rd_backend = InvalidBackendId;
diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
index 0cc9ede..1dff0c8 100644
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -15593,8 +15593,8 @@ dumpTableSchema(Archive *fout, TableInfo *tbinfo)
 											 tbinfo->dobj.catId.oid, false);
 
 		appendPQExpBuffer(q, "CREATE %s%s %s",
-						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ?
-						  "UNLOGGED " : "",
+						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ? "UNLOGGED "
+						  : tbinfo->relpersistence == RELPERSISTENCE_SESSION ? "SESSION " : "",
 						  reltypename,
 						  qualrelname);
 
diff --git a/src/common/relpath.c b/src/common/relpath.c
index 62b9553..cef99d2 100644
--- a/src/common/relpath.c
+++ b/src/common/relpath.c
@@ -166,7 +166,18 @@ GetRelationPath(Oid dbNode, Oid spcNode, Oid relNode,
 		}
 		else
 		{
-			if (forkNumber != MAIN_FORKNUM)
+			/*
+			 * Session relations are distinguished from local temp relations by adding
+			 * SessionRelFirstBackendId offset to backendId.
+			 * These is no need to separate them at file system level, so just subtract SessionRelFirstBackendId
+			 * to avoid too long file names.
+			 * Segments of session relations have the same prefix (t%d_) as local temporary relations
+			 * to make it possible to cleanup them in the same way as local temporary relation files.
+			 */
+			 if (backendId >= SessionRelFirstBackendId)
+				 backendId -= SessionRelFirstBackendId;
+
+			 if (forkNumber != MAIN_FORKNUM)
 				path = psprintf("base/%u/t%d_%u_%s",
 								dbNode, backendId, relNode,
 								forkNames[forkNumber]);
diff --git a/src/include/catalog/pg_class.h b/src/include/catalog/pg_class.h
index 090b6ba..6a39663 100644
--- a/src/include/catalog/pg_class.h
+++ b/src/include/catalog/pg_class.h
@@ -165,6 +165,7 @@ typedef FormData_pg_class *Form_pg_class;
 #define		  RELPERSISTENCE_PERMANENT	'p' /* regular table */
 #define		  RELPERSISTENCE_UNLOGGED	'u' /* unlogged permanent table */
 #define		  RELPERSISTENCE_TEMP		't' /* temporary table */
+#define		  RELPERSISTENCE_SESSION	's' /* session table */
 
 /* default selection for replica identity (primary key or nothing) */
 #define		  REPLICA_IDENTITY_DEFAULT	'd'
diff --git a/src/include/storage/backendid.h b/src/include/storage/backendid.h
index 70ef8eb..f226e7c 100644
--- a/src/include/storage/backendid.h
+++ b/src/include/storage/backendid.h
@@ -22,6 +22,13 @@ typedef int BackendId;			/* unique currently active backend identifier */
 
 #define InvalidBackendId		(-1)
 
+/*
+ * We need to distinguish local and global temporary relations by RelFileNodeBackend.
+ * The least invasive change is to add some special bias value to backend id (since 
+ * maximal number of backed is limited by MaxBackends).
+ */
+#define SessionRelFirstBackendId (0x40000000)
+
 extern PGDLLIMPORT BackendId MyBackendId;	/* backend id of this backend */
 
 /* backend id of our parallel session leader, or InvalidBackendId if none */
@@ -34,4 +41,10 @@ extern PGDLLIMPORT BackendId ParallelMasterBackendId;
 #define BackendIdForTempRelations() \
 	(ParallelMasterBackendId == InvalidBackendId ? MyBackendId : ParallelMasterBackendId)
 
+
+#define BackendIdForSessionRelations() \
+	(BackendIdForTempRelations() + SessionRelFirstBackendId)
+
+#define IsSessionRelationBackendId(id) ((id) >= SessionRelFirstBackendId)
+
 #endif							/* BACKENDID_H */
diff --git a/src/include/storage/buf_internals.h b/src/include/storage/buf_internals.h
index df2dda7..7adb96b 100644
--- a/src/include/storage/buf_internals.h
+++ b/src/include/storage/buf_internals.h
@@ -90,16 +90,17 @@
  */
 typedef struct buftag
 {
-	RelFileNode rnode;			/* physical relation identifier */
+	RelFileNodeBackend rnode;			/* physical relation identifier */
 	ForkNumber	forkNum;
 	BlockNumber blockNum;		/* blknum relative to begin of reln */
 } BufferTag;
 
 #define CLEAR_BUFFERTAG(a) \
 ( \
-	(a).rnode.spcNode = InvalidOid, \
-	(a).rnode.dbNode = InvalidOid, \
-	(a).rnode.relNode = InvalidOid, \
+	(a).rnode.node.spcNode = InvalidOid, \
+	(a).rnode.node.dbNode = InvalidOid, \
+	(a).rnode.node.relNode = InvalidOid, \
+	(a).rnode.backend = InvalidBackendId, \
 	(a).forkNum = InvalidForkNumber, \
 	(a).blockNum = InvalidBlockNumber \
 )
@@ -113,7 +114,7 @@ typedef struct buftag
 
 #define BUFFERTAGS_EQUAL(a,b) \
 ( \
-	RelFileNodeEquals((a).rnode, (b).rnode) && \
+	RelFileNodeBackendEquals((a).rnode, (b).rnode) && \
 	(a).blockNum == (b).blockNum && \
 	(a).forkNum == (b).forkNum \
 )
diff --git a/src/include/storage/bufmgr.h b/src/include/storage/bufmgr.h
index 509f4b7..3315fa0 100644
--- a/src/include/storage/bufmgr.h
+++ b/src/include/storage/bufmgr.h
@@ -205,7 +205,7 @@ extern XLogRecPtr BufferGetLSNAtomic(Buffer buffer);
 extern void PrintPinnedBufs(void);
 #endif
 extern Size BufferShmemSize(void);
-extern void BufferGetTag(Buffer buffer, RelFileNode *rnode,
+extern void BufferGetTag(Buffer buffer, RelFileNodeBackend *rnode,
 						 ForkNumber *forknum, BlockNumber *blknum);
 
 extern void MarkBufferDirtyHint(Buffer buffer, bool buffer_std);
diff --git a/src/include/storage/relfilenode.h b/src/include/storage/relfilenode.h
index 586500a..20aec72 100644
--- a/src/include/storage/relfilenode.h
+++ b/src/include/storage/relfilenode.h
@@ -75,10 +75,25 @@ typedef struct RelFileNodeBackend
 	BackendId	backend;
 } RelFileNodeBackend;
 
+/*
+ * Check whether it is local or global temporary relation, which data belongs only to one backend.
+ */
 #define RelFileNodeBackendIsTemp(rnode) \
 	((rnode).backend != InvalidBackendId)
 
 /*
+ * Check whether it is global temporary relation which metadata is shared by all sessions,
+ * but data is private for the current session.
+ */
+#define RelFileNodeBackendIsGlobalTemp(rnode) IsSessionRelationBackendId((rnode).backend)
+
+/*
+ * Check whether it is local temporary relation which exists only in this backend.
+ */
+#define RelFileNodeBackendIsLocalTemp(rnode) \
+	(RelFileNodeBackendIsTemp(rnode) && !RelFileNodeBackendIsGlobalTemp(rnode))
+
+/*
  * Note: RelFileNodeEquals and RelFileNodeBackendEquals compare relNode first
  * since that is most likely to be different in two unequal RelFileNodes.  It
  * is probably redundant to compare spcNode if the other fields are found equal,
diff --git a/src/test/regress/expected/session_table.out b/src/test/regress/expected/session_table.out
new file mode 100644
index 0000000..1b9b3f4
--- /dev/null
+++ b/src/test/regress/expected/session_table.out
@@ -0,0 +1,64 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+ count 
+-------
+ 10000
+(1 row)
+
+\c
+select count(*) from my_private_table;
+ count 
+-------
+     0
+(1 row)
+
+select * from my_private_table where x=10001;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select * from my_private_table where y=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select count(*) from my_private_table;
+ count  
+--------
+ 100000
+(1 row)
+
+\c
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+   x    |   y    
+--------+--------
+ 100000 | 100000
+(1 row)
+
+drop table  my_private_table;
diff --git a/src/test/regress/parallel_schedule b/src/test/regress/parallel_schedule
index fc0f141..3a6c78d 100644
--- a/src/test/regress/parallel_schedule
+++ b/src/test/regress/parallel_schedule
@@ -107,7 +107,7 @@ test: json jsonb json_encoding jsonpath jsonpath_encoding jsonb_jsonpath
 # NB: temp.sql does a reconnect which transiently uses 2 connections,
 # so keep this parallel group to at most 19 tests
 # ----------
-test: plancache limit plpgsql copy2 temp domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
+test: plancache limit plpgsql copy2 temp session_table domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
 
 # ----------
 # Another group of parallel tests
diff --git a/src/test/regress/serial_schedule b/src/test/regress/serial_schedule
index 68ac56a..b7fcc99 100644
--- a/src/test/regress/serial_schedule
+++ b/src/test/regress/serial_schedule
@@ -172,6 +172,7 @@ test: limit
 test: plpgsql
 test: copy2
 test: temp
+test: session_table
 test: domain
 test: rangefuncs
 test: prepare
diff --git a/src/test/regress/sql/session_table.sql b/src/test/regress/sql/session_table.sql
new file mode 100644
index 0000000..c6663dc
--- /dev/null
+++ b/src/test/regress/sql/session_table.sql
@@ -0,0 +1,18 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+\c
+select count(*) from my_private_table;
+select * from my_private_table where x=10001;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+select * from my_private_table where y=10001;
+select count(*) from my_private_table;
+\c
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+drop table  my_private_table;

diff --git a/contrib/pg_buffercache/pg_buffercache_pages.c b/contrib/pg_buffercache/pg_buffercache_pages.c
index 1bd579f..2d93f6f 100644
--- a/contrib/pg_buffercache/pg_buffercache_pages.c
+++ b/contrib/pg_buffercache/pg_buffercache_pages.c
@@ -153,9 +153,9 @@ pg_buffercache_pages(PG_FUNCTION_ARGS)
 			buf_state = LockBufHdr(bufHdr);
 
 			fctx->record[i].bufferid = BufferDescriptorGetBuffer(bufHdr);
-			fctx->record[i].relfilenode = bufHdr->tag.rnode.relNode;
-			fctx->record[i].reltablespace = bufHdr->tag.rnode.spcNode;
-			fctx->record[i].reldatabase = bufHdr->tag.rnode.dbNode;
+			fctx->record[i].relfilenode = bufHdr->tag.rnode.node.relNode;
+			fctx->record[i].reltablespace = bufHdr->tag.rnode.node.spcNode;
+			fctx->record[i].reldatabase = bufHdr->tag.rnode.node.dbNode;
 			fctx->record[i].forknum = bufHdr->tag.forkNum;
 			fctx->record[i].blocknum = bufHdr->tag.blockNum;
 			fctx->record[i].usagecount = BUF_STATE_GET_USAGECOUNT(buf_state);
diff --git a/contrib/pg_prewarm/autoprewarm.c b/contrib/pg_prewarm/autoprewarm.c
index 38ae240..8a04954 100644
--- a/contrib/pg_prewarm/autoprewarm.c
+++ b/contrib/pg_prewarm/autoprewarm.c
@@ -608,9 +608,9 @@ apw_dump_now(bool is_bgworker, bool dump_unlogged)
 		if (buf_state & BM_TAG_VALID &&
 			((buf_state & BM_PERMANENT) || dump_unlogged))
 		{
-			block_info_array[num_blocks].database = bufHdr->tag.rnode.dbNode;
-			block_info_array[num_blocks].tablespace = bufHdr->tag.rnode.spcNode;
-			block_info_array[num_blocks].filenode = bufHdr->tag.rnode.relNode;
+			block_info_array[num_blocks].database = bufHdr->tag.rnode.node.dbNode;
+			block_info_array[num_blocks].tablespace = bufHdr->tag.rnode.node.spcNode;
+			block_info_array[num_blocks].filenode = bufHdr->tag.rnode.node.relNode;
 			block_info_array[num_blocks].forknum = bufHdr->tag.forkNum;
 			block_info_array[num_blocks].blocknum = bufHdr->tag.blockNum;
 			++num_blocks;
diff --git a/src/backend/access/gin/ginxlog.c b/src/backend/access/gin/ginxlog.c
index c945b28..14d4e48 100644
--- a/src/backend/access/gin/ginxlog.c
+++ b/src/backend/access/gin/ginxlog.c
@@ -95,13 +95,13 @@ ginRedoInsertEntry(Buffer buffer, bool isLeaf, BlockNumber rightblkno, void *rda
 
 	if (PageAddItem(page, (Item) itup, IndexTupleSize(itup), offset, false, false) == InvalidOffsetNumber)
 	{
-		RelFileNode node;
+		RelFileNodeBackend rnode;
 		ForkNumber	forknum;
 		BlockNumber blknum;
 
-		BufferGetTag(buffer, &node, &forknum, &blknum);
+		BufferGetTag(buffer, &rnode, &forknum, &blknum);
 		elog(ERROR, "failed to add item to index page in %u/%u/%u",
-			 node.spcNode, node.dbNode, node.relNode);
+			 rnode.node.spcNode, rnode.node.dbNode, rnode.node.relNode);
 	}
 }
 
diff --git a/src/backend/access/gist/gistutil.c b/src/backend/access/gist/gistutil.c
index 9726020..389466e 100644
--- a/src/backend/access/gist/gistutil.c
+++ b/src/backend/access/gist/gistutil.c
@@ -1028,7 +1028,8 @@ gistGetFakeLSN(Relation rel)
 {
 	static XLogRecPtr counter = FirstNormalUnloggedLSN;
 
-	if (rel->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
+	if (rel->rd_rel->relpersistence == RELPERSISTENCE_TEMP ||
+		rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
 	{
 		/*
 		 * Temporary relations are only accessible in our session, so a simple
diff --git a/src/backend/access/heap/heapam_handler.c b/src/backend/access/heap/heapam_handler.c
index 09bc6fe..c60effd 100644
--- a/src/backend/access/heap/heapam_handler.c
+++ b/src/backend/access/heap/heapam_handler.c
@@ -671,6 +671,7 @@ heapam_relation_copy_data(Relation rel, const RelFileNode *newrnode)
 			 * init fork of an unlogged relation.
 			 */
 			if (rel->rd_rel->relpersistence == RELPERSISTENCE_PERMANENT ||
+				rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ||
 				(rel->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED &&
 				 forkNum == INIT_FORKNUM))
 				log_smgrcreate(newrnode, forkNum);
diff --git a/src/backend/access/nbtree/nbtpage.c b/src/backend/access/nbtree/nbtpage.c
index 5962126..60f4696 100644
--- a/src/backend/access/nbtree/nbtpage.c
+++ b/src/backend/access/nbtree/nbtpage.c
@@ -763,7 +763,11 @@ _bt_getbuf(Relation rel, BlockNumber blkno, int access)
 		/* Read an existing block of the relation */
 		buf = ReadBuffer(rel, blkno);
 		LockBuffer(buf, access);
-		_bt_checkpage(rel, buf);
+		/* Session temporary relation may be not yet initialized for this backend. */
+		if (blkno == BTREE_METAPAGE && PageIsNew(BufferGetPage(buf)) && IsSessionRelationBackendId(rel->rd_backend))
+			_bt_initmetapage(BufferGetPage(buf), P_NONE, 0);
+		else
+			_bt_checkpage(rel, buf);
 	}
 	else
 	{
diff --git a/src/backend/access/transam/xloginsert.c b/src/backend/access/transam/xloginsert.c
index 3ec67d4..edec8ca 100644
--- a/src/backend/access/transam/xloginsert.c
+++ b/src/backend/access/transam/xloginsert.c
@@ -213,6 +213,7 @@ void
 XLogRegisterBuffer(uint8 block_id, Buffer buffer, uint8 flags)
 {
 	registered_buffer *regbuf;
+	RelFileNodeBackend rnode;
 
 	/* NO_IMAGE doesn't make sense with FORCE_IMAGE */
 	Assert(!((flags & REGBUF_FORCE_IMAGE) && (flags & (REGBUF_NO_IMAGE))));
@@ -227,7 +228,8 @@ XLogRegisterBuffer(uint8 block_id, Buffer buffer, uint8 flags)
 
 	regbuf = &registered_buffers[block_id];
 
-	BufferGetTag(buffer, &regbuf->rnode, &regbuf->forkno, &regbuf->block);
+	BufferGetTag(buffer, &rnode, &regbuf->forkno, &regbuf->block);
+	regbuf->rnode = rnode.node;
 	regbuf->page = BufferGetPage(buffer);
 	regbuf->flags = flags;
 	regbuf->rdata_tail = (XLogRecData *) &regbuf->rdata_head;
@@ -919,7 +921,7 @@ XLogSaveBufferForHint(Buffer buffer, bool buffer_std)
 		int			flags;
 		PGAlignedBlock copied_buffer;
 		char	   *origdata = (char *) BufferGetBlock(buffer);
-		RelFileNode rnode;
+		RelFileNodeBackend rnode;
 		ForkNumber	forkno;
 		BlockNumber blkno;
 
@@ -948,7 +950,7 @@ XLogSaveBufferForHint(Buffer buffer, bool buffer_std)
 			flags |= REGBUF_STANDARD;
 
 		BufferGetTag(buffer, &rnode, &forkno, &blkno);
-		XLogRegisterBlock(0, &rnode, forkno, blkno, copied_buffer.data, flags);
+		XLogRegisterBlock(0, &rnode.node, forkno, blkno, copied_buffer.data, flags);
 
 		recptr = XLogInsert(RM_XLOG_ID, XLOG_FPI_FOR_HINT);
 	}
@@ -1009,7 +1011,7 @@ XLogRecPtr
 log_newpage_buffer(Buffer buffer, bool page_std)
 {
 	Page		page = BufferGetPage(buffer);
-	RelFileNode rnode;
+	RelFileNodeBackend rnode;
 	ForkNumber	forkNum;
 	BlockNumber blkno;
 
@@ -1018,7 +1020,7 @@ log_newpage_buffer(Buffer buffer, bool page_std)
 
 	BufferGetTag(buffer, &rnode, &forkNum, &blkno);
 
-	return log_newpage(&rnode, forkNum, blkno, page, page_std);
+	return log_newpage(&rnode.node, forkNum, blkno, page, page_std);
 }
 
 /*
diff --git a/src/backend/catalog/catalog.c b/src/backend/catalog/catalog.c
index a065419..8814afb 100644
--- a/src/backend/catalog/catalog.c
+++ b/src/backend/catalog/catalog.c
@@ -409,6 +409,9 @@ GetNewRelFileNode(Oid reltablespace, Relation pg_class, char relpersistence)
 		case RELPERSISTENCE_TEMP:
 			backend = BackendIdForTempRelations();
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 99ae159..24b2438 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3612,7 +3612,7 @@ reindex_relation(Oid relid, int flags, int options)
 		if (flags & REINDEX_REL_FORCE_INDEXES_UNLOGGED)
 			persistence = RELPERSISTENCE_UNLOGGED;
 		else if (flags & REINDEX_REL_FORCE_INDEXES_PERMANENT)
-			persistence = RELPERSISTENCE_PERMANENT;
+			persistence = rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ? RELPERSISTENCE_SESSION : RELPERSISTENCE_PERMANENT;
 		else
 			persistence = rel->rd_rel->relpersistence;
 
diff --git a/src/backend/catalog/storage.c b/src/backend/catalog/storage.c
index 3cc886f..a111ddc 100644
--- a/src/backend/catalog/storage.c
+++ b/src/backend/catalog/storage.c
@@ -93,6 +93,10 @@ RelationCreateStorage(RelFileNode rnode, char relpersistence)
 			backend = InvalidBackendId;
 			needs_wal = false;
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			needs_wal = false;
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
 			needs_wal = true;
diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index cedb4ee..d11c5b3 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -1400,7 +1400,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap,
 	 */
 	if (newrelpersistence == RELPERSISTENCE_UNLOGGED)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_UNLOGGED;
-	else if (newrelpersistence == RELPERSISTENCE_PERMANENT)
+	else if (newrelpersistence != RELPERSISTENCE_TEMP)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_PERMANENT;
 
 	/* Report that we are now reindexing relations */
diff --git a/src/backend/commands/sequence.c b/src/backend/commands/sequence.c
index 0960b33..3604e4af 100644
--- a/src/backend/commands/sequence.c
+++ b/src/backend/commands/sequence.c
@@ -94,7 +94,7 @@ static HTAB *seqhashtab = NULL; /* hash table for SeqTable items */
  */
 static SeqTableData *last_used_seq = NULL;
 
-static void fill_seq_with_data(Relation rel, HeapTuple tuple);
+static void fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf);
 static Relation lock_and_open_sequence(SeqTable seq);
 static void create_seq_hashtable(void);
 static void init_sequence(Oid relid, SeqTable *p_elm, Relation *p_rel);
@@ -222,7 +222,7 @@ DefineSequence(ParseState *pstate, CreateSeqStmt *seq)
 
 	/* now initialize the sequence's data */
 	tuple = heap_form_tuple(tupDesc, value, null);
-	fill_seq_with_data(rel, tuple);
+	fill_seq_with_data(rel, tuple, InvalidBuffer);
 
 	/* process OWNED BY if given */
 	if (owned_by)
@@ -327,7 +327,7 @@ ResetSequence(Oid seq_relid)
 	/*
 	 * Insert the modified tuple into the new storage file.
 	 */
-	fill_seq_with_data(seq_rel, tuple);
+	fill_seq_with_data(seq_rel, tuple, InvalidBuffer);
 
 	/* Clear local cache so that we don't think we have cached numbers */
 	/* Note that we do not change the currval() state */
@@ -340,18 +340,21 @@ ResetSequence(Oid seq_relid)
  * Initialize a sequence's relation with the specified tuple as content
  */
 static void
-fill_seq_with_data(Relation rel, HeapTuple tuple)
+fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf)
 {
-	Buffer		buf;
 	Page		page;
 	sequence_magic *sm;
 	OffsetNumber offnum;
+	bool lockBuffer = false;
 
 	/* Initialize first page of relation with special magic number */
 
-	buf = ReadBuffer(rel, P_NEW);
-	Assert(BufferGetBlockNumber(buf) == 0);
-
+	if (buf == InvalidBuffer)
+	{
+		buf = ReadBuffer(rel, P_NEW);
+		Assert(BufferGetBlockNumber(buf) == 0);
+		lockBuffer = true;
+	}
 	page = BufferGetPage(buf);
 
 	PageInit(page, BufferGetPageSize(buf), sizeof(sequence_magic));
@@ -360,7 +363,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	/* Now insert sequence tuple */
 
-	LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
+	if (lockBuffer)
+		LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
 
 	/*
 	 * Since VACUUM does not process sequences, we have to force the tuple to
@@ -410,7 +414,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	END_CRIT_SECTION();
 
-	UnlockReleaseBuffer(buf);
+	if (lockBuffer)
+		UnlockReleaseBuffer(buf);
 }
 
 /*
@@ -502,7 +507,7 @@ AlterSequence(ParseState *pstate, AlterSeqStmt *stmt)
 		/*
 		 * Insert the modified tuple into the new storage file.
 		 */
-		fill_seq_with_data(seqrel, newdatatuple);
+		fill_seq_with_data(seqrel, newdatatuple, InvalidBuffer);
 	}
 
 	/* process OWNED BY if given */
@@ -1178,6 +1183,16 @@ read_seq_tuple(Relation rel, Buffer *buf, HeapTuple seqdatatuple)
 	LockBuffer(*buf, BUFFER_LOCK_EXCLUSIVE);
 
 	page = BufferGetPage(*buf);
+	if (rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION && PageIsNew(page))
+	{
+		/* Initialize sequence for global temporary tables */
+		Datum		value[SEQ_COL_LASTCOL] = {0};
+		bool		null[SEQ_COL_LASTCOL] = {false};
+		value[SEQ_COL_LASTVAL-1] = Int64GetDatumFast(1); /* start sequence with 1 */
+		HeapTuple tuple = heap_form_tuple(RelationGetDescr(rel), value, null);
+		fill_seq_with_data(rel, tuple, *buf);
+	}
+
 	sm = (sequence_magic *) PageGetSpecialPointer(page);
 
 	if (sm->magic != SEQ_MAGIC)
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index fb2be10..38a25cf 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -586,7 +586,8 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 	 * Check consistency of arguments
 	 */
 	if (stmt->oncommit != ONCOMMIT_NOOP
-		&& stmt->relation->relpersistence != RELPERSISTENCE_TEMP)
+		&& stmt->relation->relpersistence != RELPERSISTENCE_TEMP
+		&& stmt->relation->relpersistence != RELPERSISTENCE_SESSION)
 		ereport(ERROR,
 				(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 				 errmsg("ON COMMIT can only be used on temporary tables")));
@@ -7678,6 +7679,12 @@ ATAddForeignKeyConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
 						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 						 errmsg("constraints on unlogged tables may reference only permanent or unlogged tables")));
 			break;
+		case RELPERSISTENCE_SESSION:
+			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
+				ereport(ERROR,
+						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+						 errmsg("constraints on session tables may reference only session tables")));
+			break;
 		case RELPERSISTENCE_TEMP:
 			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_TEMP)
 				ereport(ERROR,
@@ -14082,6 +14089,13 @@ ATPrepChangePersistence(Relation rel, bool toLogged)
 							RelationGetRelationName(rel)),
 					 errtable(rel)));
 			break;
+		case RELPERSISTENCE_SESSION:
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+					 errmsg("cannot change logged status of session table \"%s\"",
+							RelationGetRelationName(rel)),
+					 errtable(rel)));
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			if (toLogged)
 				/* nothing to do */
@@ -14569,14 +14583,7 @@ PreCommit_on_commit_actions(void)
 				/* Do nothing (there shouldn't be such entries, actually) */
 				break;
 			case ONCOMMIT_DELETE_ROWS:
-
-				/*
-				 * If this transaction hasn't accessed any temporary
-				 * relations, we can skip truncating ON COMMIT DELETE ROWS
-				 * tables, as they must still be empty.
-				 */
-				if ((MyXactFlags & XACT_FLAGS_ACCESSEDTEMPNAMESPACE))
-					oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
+				oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
 				break;
 			case ONCOMMIT_DROP:
 				oids_to_drop = lappend_oid(oids_to_drop, oc->relid);
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index c97bb36..f9b2000 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -3265,20 +3265,11 @@ OptTemp:	TEMPORARY					{ $$ = RELPERSISTENCE_TEMP; }
 			| TEMP						{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMPORARY			{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMP				{ $$ = RELPERSISTENCE_TEMP; }
-			| GLOBAL TEMPORARY
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
-			| GLOBAL TEMP
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
+			| GLOBAL TEMPORARY          { $$ = RELPERSISTENCE_SESSION; }
+			| GLOBAL TEMP               { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION                   { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMPORARY         { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMP              { $$ = RELPERSISTENCE_SESSION; }
 			| UNLOGGED					{ $$ = RELPERSISTENCE_UNLOGGED; }
 			| /*EMPTY*/					{ $$ = RELPERSISTENCE_PERMANENT; }
 		;
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index a9b2f8b..2f261b9 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -437,6 +437,14 @@ generateSerialExtraStmts(CreateStmtContext *cxt, ColumnDef *column,
 	seqstmt->options = seqoptions;
 
 	/*
+	 * Why we should not always use persistence of parent table?
+	 * Although it is prohibited to have unlogged sequences,
+	 * unlogged tables with SERIAL fields are accepted!
+	 */
+	if (cxt->relation->relpersistence != RELPERSISTENCE_UNLOGGED)
+		seqstmt->sequence->relpersistence = cxt->relation->relpersistence;
+
+	/*
 	 * If a sequence data type was specified, add it to the options.  Prepend
 	 * to the list rather than append; in case a user supplied their own AS
 	 * clause, the "redundant options" error will point to their occurrence,
diff --git a/src/backend/postmaster/autovacuum.c b/src/backend/postmaster/autovacuum.c
index 073f313..ae8b7fd 100644
--- a/src/backend/postmaster/autovacuum.c
+++ b/src/backend/postmaster/autovacuum.c
@@ -2069,7 +2069,8 @@ do_autovacuum(void)
 		 * Check if it is a temp table (presumably, of some other backend's).
 		 * We cannot safely process other backends' temp tables.
 		 */
-		if (classForm->relpersistence == RELPERSISTENCE_TEMP)
+		if (classForm->relpersistence == RELPERSISTENCE_TEMP ||
+			classForm->relpersistence == RELPERSISTENCE_SESSION)
 		{
 			/*
 			 * We just ignore it if the owning backend is still active and
@@ -2154,7 +2155,8 @@ do_autovacuum(void)
 		/*
 		 * We cannot safely process other backends' temp tables, so skip 'em.
 		 */
-		if (classForm->relpersistence == RELPERSISTENCE_TEMP)
+		if (classForm->relpersistence == RELPERSISTENCE_TEMP ||
+			classForm->relpersistence == RELPERSISTENCE_SESSION)
 			continue;
 
 		relid = classForm->oid;
diff --git a/src/backend/replication/logical/reorderbuffer.c b/src/backend/replication/logical/reorderbuffer.c
index e8ffa04..2004d2f 100644
--- a/src/backend/replication/logical/reorderbuffer.c
+++ b/src/backend/replication/logical/reorderbuffer.c
@@ -3483,6 +3483,7 @@ ResolveCminCmaxDuringDecoding(HTAB *tuplecid_data,
 {
 	ReorderBufferTupleCidKey key;
 	ReorderBufferTupleCidEnt *ent;
+	RelFileNodeBackend rnode;
 	ForkNumber	forkno;
 	BlockNumber blockno;
 	bool		updated_mapping = false;
@@ -3496,7 +3497,8 @@ ResolveCminCmaxDuringDecoding(HTAB *tuplecid_data,
 	 * get relfilenode from the buffer, no convenient way to access it other
 	 * than that.
 	 */
-	BufferGetTag(buffer, &key.relnode, &forkno, &blockno);
+	BufferGetTag(buffer, &rnode, &forkno, &blockno);
+	key.relnode = rnode.node;
 
 	/* tuples can only be in the main fork */
 	Assert(forkno == MAIN_FORKNUM);
diff --git a/src/backend/storage/buffer/bufmgr.c b/src/backend/storage/buffer/bufmgr.c
index 6f3a402..76ce953 100644
--- a/src/backend/storage/buffer/bufmgr.c
+++ b/src/backend/storage/buffer/bufmgr.c
@@ -556,7 +556,7 @@ PrefetchBuffer(Relation reln, ForkNumber forkNum, BlockNumber blockNum)
 		int			buf_id;
 
 		/* create a tag so we can lookup the buffer */
-		INIT_BUFFERTAG(newTag, reln->rd_smgr->smgr_rnode.node,
+		INIT_BUFFERTAG(newTag, reln->rd_smgr->smgr_rnode,
 					   forkNum, blockNum);
 
 		/* determine its hash code and partition lock ID */
@@ -710,7 +710,7 @@ ReadBuffer_common(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
 	Block		bufBlock;
 	bool		found;
 	bool		isExtend;
-	bool		isLocalBuf = SmgrIsTemp(smgr);
+	bool		isLocalBuf = SmgrIsTemp(smgr) && relpersistence == RELPERSISTENCE_TEMP;
 
 	*hit = false;
 
@@ -1010,7 +1010,7 @@ BufferAlloc(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
 	uint32		buf_state;
 
 	/* create a tag so we can lookup the buffer */
-	INIT_BUFFERTAG(newTag, smgr->smgr_rnode.node, forkNum, blockNum);
+	INIT_BUFFERTAG(newTag, smgr->smgr_rnode, forkNum, blockNum);
 
 	/* determine its hash code and partition lock ID */
 	newHash = BufTableHashCode(&newTag);
@@ -1532,7 +1532,8 @@ ReleaseAndReadBuffer(Buffer buffer,
 		{
 			bufHdr = GetLocalBufferDescriptor(-buffer - 1);
 			if (bufHdr->tag.blockNum == blockNum &&
-				RelFileNodeEquals(bufHdr->tag.rnode, relation->rd_node) &&
+				RelFileNodeEquals(bufHdr->tag.rnode.node, relation->rd_node) &&
+				bufHdr->tag.rnode.backend == relation->rd_backend &&
 				bufHdr->tag.forkNum == forkNum)
 				return buffer;
 			ResourceOwnerForgetBuffer(CurrentResourceOwner, buffer);
@@ -1543,7 +1544,8 @@ ReleaseAndReadBuffer(Buffer buffer,
 			bufHdr = GetBufferDescriptor(buffer - 1);
 			/* we have pin, so it's ok to examine tag without spinlock */
 			if (bufHdr->tag.blockNum == blockNum &&
-				RelFileNodeEquals(bufHdr->tag.rnode, relation->rd_node) &&
+				RelFileNodeEquals(bufHdr->tag.rnode.node, relation->rd_node) &&
+				bufHdr->tag.rnode.backend == relation->rd_backend &&
 				bufHdr->tag.forkNum == forkNum)
 				return buffer;
 			UnpinBuffer(bufHdr, true);
@@ -1845,8 +1847,8 @@ BufferSync(int flags)
 
 			item = &CkptBufferIds[num_to_scan++];
 			item->buf_id = buf_id;
-			item->tsId = bufHdr->tag.rnode.spcNode;
-			item->relNode = bufHdr->tag.rnode.relNode;
+			item->tsId = bufHdr->tag.rnode.node.spcNode;
+			item->relNode = bufHdr->tag.rnode.node.relNode;
 			item->forkNum = bufHdr->tag.forkNum;
 			item->blockNum = bufHdr->tag.blockNum;
 		}
@@ -2559,7 +2561,7 @@ PrintBufferLeakWarning(Buffer buffer)
 	}
 
 	/* theoretically we should lock the bufhdr here */
-	path = relpathbackend(buf->tag.rnode, backend, buf->tag.forkNum);
+	path = relpathbackend(buf->tag.rnode.node, backend, buf->tag.forkNum);
 	buf_state = pg_atomic_read_u32(&buf->state);
 	elog(WARNING,
 		 "buffer refcount leak: [%03d] "
@@ -2631,7 +2633,7 @@ BufferGetBlockNumber(Buffer buffer)
  *		a buffer.
  */
 void
-BufferGetTag(Buffer buffer, RelFileNode *rnode, ForkNumber *forknum,
+BufferGetTag(Buffer buffer, RelFileNodeBackend *rnode, ForkNumber *forknum,
 			 BlockNumber *blknum)
 {
 	BufferDesc *bufHdr;
@@ -2696,7 +2698,7 @@ FlushBuffer(BufferDesc *buf, SMgrRelation reln)
 
 	/* Find smgr relation for buffer */
 	if (reln == NULL)
-		reln = smgropen(buf->tag.rnode, InvalidBackendId);
+		reln = smgropen(buf->tag.rnode.node, buf->tag.rnode.backend);
 
 	TRACE_POSTGRESQL_BUFFER_FLUSH_START(buf->tag.forkNum,
 										buf->tag.blockNum,
@@ -2930,7 +2932,7 @@ DropRelFileNodeBuffers(RelFileNodeBackend rnode, ForkNumber forkNum,
 	int			i;
 
 	/* If it's a local relation, it's localbuf.c's problem. */
-	if (RelFileNodeBackendIsTemp(rnode))
+	if (RelFileNodeBackendIsLocalTemp(rnode))
 	{
 		if (rnode.backend == MyBackendId)
 			DropRelFileNodeLocalBuffers(rnode.node, forkNum, firstDelBlock);
@@ -2958,11 +2960,11 @@ DropRelFileNodeBuffers(RelFileNodeBackend rnode, ForkNumber forkNum,
 		 * We could check forkNum and blockNum as well as the rnode, but the
 		 * incremental win from doing so seems small.
 		 */
-		if (!RelFileNodeEquals(bufHdr->tag.rnode, rnode.node))
+		if (!RelFileNodeBackendEquals(bufHdr->tag.rnode, rnode))
 			continue;
 
 		buf_state = LockBufHdr(bufHdr);
-		if (RelFileNodeEquals(bufHdr->tag.rnode, rnode.node) &&
+		if (RelFileNodeBackendEquals(bufHdr->tag.rnode, rnode) &&
 			bufHdr->tag.forkNum == forkNum &&
 			bufHdr->tag.blockNum >= firstDelBlock)
 			InvalidateBuffer(bufHdr);	/* releases spinlock */
@@ -2985,24 +2987,24 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 {
 	int			i,
 				n = 0;
-	RelFileNode *nodes;
+	RelFileNodeBackend *nodes;
 	bool		use_bsearch;
 
 	if (nnodes == 0)
 		return;
 
-	nodes = palloc(sizeof(RelFileNode) * nnodes);	/* non-local relations */
+	nodes = palloc(sizeof(RelFileNodeBackend) * nnodes);	/* non-local relations */
 
 	/* If it's a local relation, it's localbuf.c's problem. */
 	for (i = 0; i < nnodes; i++)
 	{
-		if (RelFileNodeBackendIsTemp(rnodes[i]))
+		if (RelFileNodeBackendIsLocalTemp(rnodes[i]))
 		{
 			if (rnodes[i].backend == MyBackendId)
 				DropRelFileNodeAllLocalBuffers(rnodes[i].node);
 		}
 		else
-			nodes[n++] = rnodes[i].node;
+			nodes[n++] = rnodes[i];
 	}
 
 	/*
@@ -3025,11 +3027,11 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 
 	/* sort the list of rnodes if necessary */
 	if (use_bsearch)
-		pg_qsort(nodes, n, sizeof(RelFileNode), rnode_comparator);
+		pg_qsort(nodes, n, sizeof(RelFileNodeBackend), rnode_comparator);
 
 	for (i = 0; i < NBuffers; i++)
 	{
-		RelFileNode *rnode = NULL;
+		RelFileNodeBackend *rnode = NULL;
 		BufferDesc *bufHdr = GetBufferDescriptor(i);
 		uint32		buf_state;
 
@@ -3044,7 +3046,7 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 
 			for (j = 0; j < n; j++)
 			{
-				if (RelFileNodeEquals(bufHdr->tag.rnode, nodes[j]))
+				if (RelFileNodeBackendEquals(bufHdr->tag.rnode, nodes[j]))
 				{
 					rnode = &nodes[j];
 					break;
@@ -3054,7 +3056,7 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 		else
 		{
 			rnode = bsearch((const void *) &(bufHdr->tag.rnode),
-							nodes, n, sizeof(RelFileNode),
+							nodes, n, sizeof(RelFileNodeBackend),
 							rnode_comparator);
 		}
 
@@ -3063,7 +3065,7 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 			continue;
 
 		buf_state = LockBufHdr(bufHdr);
-		if (RelFileNodeEquals(bufHdr->tag.rnode, (*rnode)))
+		if (RelFileNodeBackendEquals(bufHdr->tag.rnode, (*rnode)))
 			InvalidateBuffer(bufHdr);	/* releases spinlock */
 		else
 			UnlockBufHdr(bufHdr, buf_state);
@@ -3102,11 +3104,11 @@ DropDatabaseBuffers(Oid dbid)
 		 * As in DropRelFileNodeBuffers, an unlocked precheck should be safe
 		 * and saves some cycles.
 		 */
-		if (bufHdr->tag.rnode.dbNode != dbid)
+		if (bufHdr->tag.rnode.node.dbNode != dbid)
 			continue;
 
 		buf_state = LockBufHdr(bufHdr);
-		if (bufHdr->tag.rnode.dbNode == dbid)
+		if (bufHdr->tag.rnode.node.dbNode == dbid)
 			InvalidateBuffer(bufHdr);	/* releases spinlock */
 		else
 			UnlockBufHdr(bufHdr, buf_state);
@@ -3136,7 +3138,7 @@ PrintBufferDescs(void)
 			 "[%02d] (freeNext=%d, rel=%s, "
 			 "blockNum=%u, flags=0x%x, refcount=%u %d)",
 			 i, buf->freeNext,
-			 relpathbackend(buf->tag.rnode, InvalidBackendId, buf->tag.forkNum),
+			 relpath(buf->tag.rnode, buf->tag.forkNum),
 			 buf->tag.blockNum, buf->flags,
 			 buf->refcount, GetPrivateRefCount(b));
 	}
@@ -3204,7 +3206,8 @@ FlushRelationBuffers(Relation rel)
 			uint32		buf_state;
 
 			bufHdr = GetLocalBufferDescriptor(i);
-			if (RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node) &&
+			if (RelFileNodeEquals(bufHdr->tag.rnode.node, rel->rd_node) &&
+				bufHdr->tag.rnode.backend == rel->rd_backend &&
 				((buf_state = pg_atomic_read_u32(&bufHdr->state)) &
 				 (BM_VALID | BM_DIRTY)) == (BM_VALID | BM_DIRTY))
 			{
@@ -3251,13 +3254,15 @@ FlushRelationBuffers(Relation rel)
 		 * As in DropRelFileNodeBuffers, an unlocked precheck should be safe
 		 * and saves some cycles.
 		 */
-		if (!RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node))
+		if (!RelFileNodeEquals(bufHdr->tag.rnode.node, rel->rd_node)
+			|| bufHdr->tag.rnode.backend != rel->rd_backend)
 			continue;
 
 		ReservePrivateRefCountEntry();
 
 		buf_state = LockBufHdr(bufHdr);
-		if (RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node) &&
+		if (RelFileNodeEquals(bufHdr->tag.rnode.node, rel->rd_node) &&
+			bufHdr->tag.rnode.backend == rel->rd_backend &&
 			(buf_state & (BM_VALID | BM_DIRTY)) == (BM_VALID | BM_DIRTY))
 		{
 			PinBuffer_Locked(bufHdr);
@@ -3305,13 +3310,13 @@ FlushDatabaseBuffers(Oid dbid)
 		 * As in DropRelFileNodeBuffers, an unlocked precheck should be safe
 		 * and saves some cycles.
 		 */
-		if (bufHdr->tag.rnode.dbNode != dbid)
+		if (bufHdr->tag.rnode.node.dbNode != dbid)
 			continue;
 
 		ReservePrivateRefCountEntry();
 
 		buf_state = LockBufHdr(bufHdr);
-		if (bufHdr->tag.rnode.dbNode == dbid &&
+		if (bufHdr->tag.rnode.node.dbNode == dbid &&
 			(buf_state & (BM_VALID | BM_DIRTY)) == (BM_VALID | BM_DIRTY))
 		{
 			PinBuffer_Locked(bufHdr);
@@ -4051,7 +4056,7 @@ AbortBufferIO(void)
 				/* Buffer is pinned, so we can read tag without spinlock */
 				char	   *path;
 
-				path = relpathperm(buf->tag.rnode, buf->tag.forkNum);
+				path = relpath(buf->tag.rnode, buf->tag.forkNum);
 				ereport(WARNING,
 						(errcode(ERRCODE_IO_ERROR),
 						 errmsg("could not write block %u of %s",
@@ -4075,7 +4080,7 @@ shared_buffer_write_error_callback(void *arg)
 	/* Buffer is pinned, so we can read the tag without locking the spinlock */
 	if (bufHdr != NULL)
 	{
-		char	   *path = relpathperm(bufHdr->tag.rnode, bufHdr->tag.forkNum);
+		char	   *path = relpath(bufHdr->tag.rnode, bufHdr->tag.forkNum);
 
 		errcontext("writing block %u of relation %s",
 				   bufHdr->tag.blockNum, path);
@@ -4093,7 +4098,7 @@ local_buffer_write_error_callback(void *arg)
 
 	if (bufHdr != NULL)
 	{
-		char	   *path = relpathbackend(bufHdr->tag.rnode, MyBackendId,
+		char	   *path = relpathbackend(bufHdr->tag.rnode.node, MyBackendId,
 										  bufHdr->tag.forkNum);
 
 		errcontext("writing block %u of relation %s",
@@ -4108,22 +4113,27 @@ local_buffer_write_error_callback(void *arg)
 static int
 rnode_comparator(const void *p1, const void *p2)
 {
-	RelFileNode n1 = *(const RelFileNode *) p1;
-	RelFileNode n2 = *(const RelFileNode *) p2;
+	RelFileNodeBackend n1 = *(const RelFileNodeBackend *) p1;
+	RelFileNodeBackend n2 = *(const RelFileNodeBackend *) p2;
 
-	if (n1.relNode < n2.relNode)
+	if (n1.node.relNode < n2.node.relNode)
 		return -1;
-	else if (n1.relNode > n2.relNode)
+	else if (n1.node.relNode > n2.node.relNode)
 		return 1;
 
-	if (n1.dbNode < n2.dbNode)
+	if (n1.node.dbNode < n2.node.dbNode)
 		return -1;
-	else if (n1.dbNode > n2.dbNode)
+	else if (n1.node.dbNode > n2.node.dbNode)
 		return 1;
 
-	if (n1.spcNode < n2.spcNode)
+	if (n1.node.spcNode < n2.node.spcNode)
 		return -1;
-	else if (n1.spcNode > n2.spcNode)
+	else if (n1.node.spcNode > n2.node.spcNode)
+		return 1;
+
+	if (n1.backend < n2.backend)
+		return -1;
+	else if (n1.backend > n2.backend)
 		return 1;
 	else
 		return 0;
@@ -4359,7 +4369,7 @@ IssuePendingWritebacks(WritebackContext *context)
 			next = &context->pending_writebacks[i + ahead + 1];
 
 			/* different file, stop */
-			if (!RelFileNodeEquals(cur->tag.rnode, next->tag.rnode) ||
+			if (!RelFileNodeBackendEquals(cur->tag.rnode, next->tag.rnode) ||
 				cur->tag.forkNum != next->tag.forkNum)
 				break;
 
@@ -4378,7 +4388,7 @@ IssuePendingWritebacks(WritebackContext *context)
 		i += ahead;
 
 		/* and finally tell the kernel to write the data to storage */
-		reln = smgropen(tag.rnode, InvalidBackendId);
+		reln = smgropen(tag.rnode.node, tag.rnode.backend);
 		smgrwriteback(reln, tag.forkNum, tag.blockNum, nblocks);
 	}
 
diff --git a/src/backend/storage/buffer/localbuf.c b/src/backend/storage/buffer/localbuf.c
index f5f6a29..6bd5ecb 100644
--- a/src/backend/storage/buffer/localbuf.c
+++ b/src/backend/storage/buffer/localbuf.c
@@ -68,7 +68,7 @@ LocalPrefetchBuffer(SMgrRelation smgr, ForkNumber forkNum,
 	BufferTag	newTag;			/* identity of requested block */
 	LocalBufferLookupEnt *hresult;
 
-	INIT_BUFFERTAG(newTag, smgr->smgr_rnode.node, forkNum, blockNum);
+	INIT_BUFFERTAG(newTag, smgr->smgr_rnode, forkNum, blockNum);
 
 	/* Initialize local buffers if first request in this session */
 	if (LocalBufHash == NULL)
@@ -111,7 +111,7 @@ LocalBufferAlloc(SMgrRelation smgr, ForkNumber forkNum, BlockNumber blockNum,
 	bool		found;
 	uint32		buf_state;
 
-	INIT_BUFFERTAG(newTag, smgr->smgr_rnode.node, forkNum, blockNum);
+	INIT_BUFFERTAG(newTag, smgr->smgr_rnode, forkNum, blockNum);
 
 	/* Initialize local buffers if first request in this session */
 	if (LocalBufHash == NULL)
@@ -209,7 +209,7 @@ LocalBufferAlloc(SMgrRelation smgr, ForkNumber forkNum, BlockNumber blockNum,
 		Page		localpage = (char *) LocalBufHdrGetBlock(bufHdr);
 
 		/* Find smgr relation for buffer */
-		oreln = smgropen(bufHdr->tag.rnode, MyBackendId);
+		oreln = smgropen(bufHdr->tag.rnode.node, MyBackendId);
 
 		PageSetChecksumInplace(localpage, bufHdr->tag.blockNum);
 
@@ -331,14 +331,14 @@ DropRelFileNodeLocalBuffers(RelFileNode rnode, ForkNumber forkNum,
 		buf_state = pg_atomic_read_u32(&bufHdr->state);
 
 		if ((buf_state & BM_TAG_VALID) &&
-			RelFileNodeEquals(bufHdr->tag.rnode, rnode) &&
+			RelFileNodeEquals(bufHdr->tag.rnode.node, rnode) &&
 			bufHdr->tag.forkNum == forkNum &&
 			bufHdr->tag.blockNum >= firstDelBlock)
 		{
 			if (LocalRefCount[i] != 0)
 				elog(ERROR, "block %u of %s is still referenced (local %u)",
 					 bufHdr->tag.blockNum,
-					 relpathbackend(bufHdr->tag.rnode, MyBackendId,
+					 relpathbackend(bufHdr->tag.rnode.node, MyBackendId,
 									bufHdr->tag.forkNum),
 					 LocalRefCount[i]);
 			/* Remove entry from hashtable */
@@ -377,12 +377,12 @@ DropRelFileNodeAllLocalBuffers(RelFileNode rnode)
 		buf_state = pg_atomic_read_u32(&bufHdr->state);
 
 		if ((buf_state & BM_TAG_VALID) &&
-			RelFileNodeEquals(bufHdr->tag.rnode, rnode))
+			RelFileNodeEquals(bufHdr->tag.rnode.node, rnode))
 		{
 			if (LocalRefCount[i] != 0)
 				elog(ERROR, "block %u of %s is still referenced (local %u)",
 					 bufHdr->tag.blockNum,
-					 relpathbackend(bufHdr->tag.rnode, MyBackendId,
+					 relpathbackend(bufHdr->tag.rnode.node, MyBackendId,
 									bufHdr->tag.forkNum),
 					 LocalRefCount[i]);
 			/* Remove entry from hashtable */
diff --git a/src/backend/storage/freespace/fsmpage.c b/src/backend/storage/freespace/fsmpage.c
index cf7f03f..65eb422 100644
--- a/src/backend/storage/freespace/fsmpage.c
+++ b/src/backend/storage/freespace/fsmpage.c
@@ -268,13 +268,13 @@ restart:
 			 *
 			 * Fix the corruption and restart.
 			 */
-			RelFileNode rnode;
+			RelFileNodeBackend rnode;
 			ForkNumber	forknum;
 			BlockNumber blknum;
 
 			BufferGetTag(buf, &rnode, &forknum, &blknum);
 			elog(DEBUG1, "fixing corrupt FSM block %u, relation %u/%u/%u",
-				 blknum, rnode.spcNode, rnode.dbNode, rnode.relNode);
+				 blknum, rnode.node.spcNode, rnode.node.dbNode, rnode.node.relNode);
 
 			/* make sure we hold an exclusive lock */
 			if (!exclusive_lock_held)
diff --git a/src/backend/storage/smgr/md.c b/src/backend/storage/smgr/md.c
index 07f3c93..204c4cb 100644
--- a/src/backend/storage/smgr/md.c
+++ b/src/backend/storage/smgr/md.c
@@ -33,6 +33,7 @@
 #include "postmaster/bgwriter.h"
 #include "storage/fd.h"
 #include "storage/bufmgr.h"
+#include "storage/ipc.h"
 #include "storage/md.h"
 #include "storage/relfilenode.h"
 #include "storage/smgr.h"
@@ -87,6 +88,18 @@ typedef struct _MdfdVec
 
 static MemoryContext MdCxt;		/* context for all MdfdVec objects */
 
+/*
+ * Structure used to collect information created by this backend.
+ * Data of this related should be deleted on backend exit.
+ */
+typedef struct SessionRelation
+{
+	RelFileNodeBackend rnode;
+	struct SessionRelation* next;
+} SessionRelation;
+
+
+static SessionRelation* SessionRelations;
 
 /* Populate a file tag describing an md.c segment file. */
 #define INIT_MD_FILETAG(a,xx_rnode,xx_forknum,xx_segno) \
@@ -152,6 +165,48 @@ mdinit(void)
 								  ALLOCSET_DEFAULT_SIZES);
 }
 
+
+/*
+ * Delete all data of session relations and remove their pages from shared buffers.
+ * This function is called on backend exit.
+ */
+static void
+TruncateSessionRelations(int code, Datum arg)
+{
+	SessionRelation* rel;
+	for (rel = SessionRelations; rel != NULL; rel = rel->next)
+	{
+		/* Remove relation pages from shared buffers */
+		DropRelFileNodesAllBuffers(&rel->rnode, 1);
+
+		/* Delete relation files */
+		mdunlink(rel->rnode, InvalidForkNumber, false);
+	}
+}
+
+/*
+ * Maintain information about session relations accessed by this backend.
+ * This list is needed to perform cleanup on backend exit.
+ * Session relation is linked in this list when this relation is created or opened and file doesn't exist.
+ * Such procedure guarantee that each relation is linked into list only once.
+ */
+static void
+RegisterSessionRelation(SMgrRelation reln)
+{
+	SessionRelation* rel = (SessionRelation*)MemoryContextAlloc(TopMemoryContext, sizeof(SessionRelation));
+
+	/*
+	 * Perform session relation cleanup on backend exit. We are using shared memory hook, because
+	 * cleanup should be performed before backend is disconnected from shared memory.
+	 */
+	if (SessionRelations == NULL)
+		on_shmem_exit(TruncateSessionRelations, 0);
+
+	rel->rnode = reln->smgr_rnode;
+	rel->next = SessionRelations;
+	SessionRelations = rel;
+}
+
 /*
  *	mdexists() -- Does the physical file exist?
  *
@@ -218,6 +273,8 @@ mdcreate(SMgrRelation reln, ForkNumber forkNum, bool isRedo)
 					 errmsg("could not create file \"%s\": %m", path)));
 		}
 	}
+	if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		RegisterSessionRelation(reln);
 
 	pfree(path);
 
@@ -465,6 +522,19 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 
 	if (fd < 0)
 	{
+		/*
+		 * In case of session relation access, there may be no yet files of this relation for this backend.
+		 * If so, then create file and register session relation for truncation on backend exit.
+		 */
+		if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
+			fd = PathNameOpenFile(path, O_RDWR | PG_BINARY | O_CREAT);
+			if (fd >= 0)
+			{
+				RegisterSessionRelation(reln);
+				goto NewSegment;
+			}
+		}
 		if ((behavior & EXTENSION_RETURN_NULL) &&
 			FILE_POSSIBLY_DELETED(errno))
 		{
@@ -476,6 +546,7 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 				 errmsg("could not open file \"%s\": %m", path)));
 	}
 
+  NewSegment:
 	pfree(path);
 
 	_fdvec_resize(reln, forknum, 1);
@@ -652,8 +723,13 @@ mdread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
 		 * complaining.  This allows, for example, the case of trying to
 		 * update a block that was later truncated away.
 		 */
-		if (zero_damaged_pages || InRecovery)
+		if (zero_damaged_pages || InRecovery || RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
 			MemSet(buffer, 0, BLCKSZ);
+			/* In case of session relation we need to write zero page to provide correct result of subsequent mdnblocks */
+			if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+				mdwrite(reln, forknum, blocknum, buffer, true);
+		}
 		else
 			ereport(ERROR,
 					(errcode(ERRCODE_DATA_CORRUPTED),
@@ -738,12 +814,18 @@ mdwrite(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
 BlockNumber
 mdnblocks(SMgrRelation reln, ForkNumber forknum)
 {
-	MdfdVec    *v = mdopenfork(reln, forknum, EXTENSION_FAIL);
+	/*
+	 * If we access session relation, there may be no files yet of this relation for this backend.
+	 * Pass EXTENSION_RETURN_NULL to make mdopen return NULL in this case instead of reporting error.
+	 */
+	MdfdVec    *v = mdopenfork(reln, forknum, RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode)
+							   ? EXTENSION_RETURN_NULL : EXTENSION_FAIL);
 	BlockNumber nblocks;
 	BlockNumber segno = 0;
 
 	/* mdopen has opened the first segment */
-	Assert(reln->md_num_open_segs[forknum] > 0);
+	if (reln->md_num_open_segs[forknum] == 0)
+		return 0;
 
 	/*
 	 * Start from the last open segments, to avoid redundant seeks.  We have
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index a87e721..2401361 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -994,6 +994,9 @@ pg_relation_filepath(PG_FUNCTION_ARGS)
 	/* Determine owning backend. */
 	switch (relform->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c
index 2488607..86e8fca 100644
--- a/src/backend/utils/cache/relcache.c
+++ b/src/backend/utils/cache/relcache.c
@@ -1098,6 +1098,10 @@ RelationBuildDesc(Oid targetRelId, bool insertIt)
 	relation->rd_newRelfilenodeSubid = InvalidSubTransactionId;
 	switch (relation->rd_rel->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			relation->rd_backend = BackendIdForSessionRelations();
+			relation->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			relation->rd_backend = InvalidBackendId;
@@ -3301,6 +3305,10 @@ RelationBuildLocalRelation(const char *relname,
 	rel->rd_rel->relpersistence = relpersistence;
 	switch (relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			rel->rd_backend = BackendIdForSessionRelations();
+			rel->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			rel->rd_backend = InvalidBackendId;
diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
index 0cc9ede..1dff0c8 100644
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -15593,8 +15593,8 @@ dumpTableSchema(Archive *fout, TableInfo *tbinfo)
 											 tbinfo->dobj.catId.oid, false);
 
 		appendPQExpBuffer(q, "CREATE %s%s %s",
-						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ?
-						  "UNLOGGED " : "",
+						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ? "UNLOGGED "
+						  : tbinfo->relpersistence == RELPERSISTENCE_SESSION ? "SESSION " : "",
 						  reltypename,
 						  qualrelname);
 
diff --git a/src/common/relpath.c b/src/common/relpath.c
index 62b9553..cef99d2 100644
--- a/src/common/relpath.c
+++ b/src/common/relpath.c
@@ -166,7 +166,18 @@ GetRelationPath(Oid dbNode, Oid spcNode, Oid relNode,
 		}
 		else
 		{
-			if (forkNumber != MAIN_FORKNUM)
+			/*
+			 * Session relations are distinguished from local temp relations by adding
+			 * SessionRelFirstBackendId offset to backendId.
+			 * These is no need to separate them at file system level, so just subtract SessionRelFirstBackendId
+			 * to avoid too long file names.
+			 * Segments of session relations have the same prefix (t%d_) as local temporary relations
+			 * to make it possible to cleanup them in the same way as local temporary relation files.
+			 */
+			 if (backendId >= SessionRelFirstBackendId)
+				 backendId -= SessionRelFirstBackendId;
+
+			 if (forkNumber != MAIN_FORKNUM)
 				path = psprintf("base/%u/t%d_%u_%s",
 								dbNode, backendId, relNode,
 								forkNames[forkNumber]);
diff --git a/src/include/catalog/pg_class.h b/src/include/catalog/pg_class.h
index 090b6ba..6a39663 100644
--- a/src/include/catalog/pg_class.h
+++ b/src/include/catalog/pg_class.h
@@ -165,6 +165,7 @@ typedef FormData_pg_class *Form_pg_class;
 #define		  RELPERSISTENCE_PERMANENT	'p' /* regular table */
 #define		  RELPERSISTENCE_UNLOGGED	'u' /* unlogged permanent table */
 #define		  RELPERSISTENCE_TEMP		't' /* temporary table */
+#define		  RELPERSISTENCE_SESSION	's' /* session table */
 
 /* default selection for replica identity (primary key or nothing) */
 #define		  REPLICA_IDENTITY_DEFAULT	'd'
diff --git a/src/include/storage/backendid.h b/src/include/storage/backendid.h
index 70ef8eb..f226e7c 100644
--- a/src/include/storage/backendid.h
+++ b/src/include/storage/backendid.h
@@ -22,6 +22,13 @@ typedef int BackendId;			/* unique currently active backend identifier */
 
 #define InvalidBackendId		(-1)
 
+/*
+ * We need to distinguish local and global temporary relations by RelFileNodeBackend.
+ * The least invasive change is to add some special bias value to backend id (since 
+ * maximal number of backed is limited by MaxBackends).
+ */
+#define SessionRelFirstBackendId (0x40000000)
+
 extern PGDLLIMPORT BackendId MyBackendId;	/* backend id of this backend */
 
 /* backend id of our parallel session leader, or InvalidBackendId if none */
@@ -34,4 +41,10 @@ extern PGDLLIMPORT BackendId ParallelMasterBackendId;
 #define BackendIdForTempRelations() \
 	(ParallelMasterBackendId == InvalidBackendId ? MyBackendId : ParallelMasterBackendId)
 
+
+#define BackendIdForSessionRelations() \
+	(BackendIdForTempRelations() + SessionRelFirstBackendId)
+
+#define IsSessionRelationBackendId(id) ((id) >= SessionRelFirstBackendId)
+
 #endif							/* BACKENDID_H */
diff --git a/src/include/storage/buf_internals.h b/src/include/storage/buf_internals.h
index df2dda7..7adb96b 100644
--- a/src/include/storage/buf_internals.h
+++ b/src/include/storage/buf_internals.h
@@ -90,16 +90,17 @@
  */
 typedef struct buftag
 {
-	RelFileNode rnode;			/* physical relation identifier */
+	RelFileNodeBackend rnode;			/* physical relation identifier */
 	ForkNumber	forkNum;
 	BlockNumber blockNum;		/* blknum relative to begin of reln */
 } BufferTag;
 
 #define CLEAR_BUFFERTAG(a) \
 ( \
-	(a).rnode.spcNode = InvalidOid, \
-	(a).rnode.dbNode = InvalidOid, \
-	(a).rnode.relNode = InvalidOid, \
+	(a).rnode.node.spcNode = InvalidOid, \
+	(a).rnode.node.dbNode = InvalidOid, \
+	(a).rnode.node.relNode = InvalidOid, \
+	(a).rnode.backend = InvalidBackendId, \
 	(a).forkNum = InvalidForkNumber, \
 	(a).blockNum = InvalidBlockNumber \
 )
@@ -113,7 +114,7 @@ typedef struct buftag
 
 #define BUFFERTAGS_EQUAL(a,b) \
 ( \
-	RelFileNodeEquals((a).rnode, (b).rnode) && \
+	RelFileNodeBackendEquals((a).rnode, (b).rnode) && \
 	(a).blockNum == (b).blockNum && \
 	(a).forkNum == (b).forkNum \
 )
diff --git a/src/include/storage/bufmgr.h b/src/include/storage/bufmgr.h
index 509f4b7..3315fa0 100644
--- a/src/include/storage/bufmgr.h
+++ b/src/include/storage/bufmgr.h
@@ -205,7 +205,7 @@ extern XLogRecPtr BufferGetLSNAtomic(Buffer buffer);
 extern void PrintPinnedBufs(void);
 #endif
 extern Size BufferShmemSize(void);
-extern void BufferGetTag(Buffer buffer, RelFileNode *rnode,
+extern void BufferGetTag(Buffer buffer, RelFileNodeBackend *rnode,
 						 ForkNumber *forknum, BlockNumber *blknum);
 
 extern void MarkBufferDirtyHint(Buffer buffer, bool buffer_std);
diff --git a/src/include/storage/relfilenode.h b/src/include/storage/relfilenode.h
index 586500a..20aec72 100644
--- a/src/include/storage/relfilenode.h
+++ b/src/include/storage/relfilenode.h
@@ -75,10 +75,25 @@ typedef struct RelFileNodeBackend
 	BackendId	backend;
 } RelFileNodeBackend;
 
+/*
+ * Check whether it is local or global temporary relation, which data belongs only to one backend.
+ */
 #define RelFileNodeBackendIsTemp(rnode) \
 	((rnode).backend != InvalidBackendId)
 
 /*
+ * Check whether it is global temporary relation which metadata is shared by all sessions,
+ * but data is private for the current session.
+ */
+#define RelFileNodeBackendIsGlobalTemp(rnode) IsSessionRelationBackendId((rnode).backend)
+
+/*
+ * Check whether it is local temporary relation which exists only in this backend.
+ */
+#define RelFileNodeBackendIsLocalTemp(rnode) \
+	(RelFileNodeBackendIsTemp(rnode) && !RelFileNodeBackendIsGlobalTemp(rnode))
+
+/*
  * Note: RelFileNodeEquals and RelFileNodeBackendEquals compare relNode first
  * since that is most likely to be different in two unequal RelFileNodes.  It
  * is probably redundant to compare spcNode if the other fields are found equal,
diff --git a/src/test/regress/expected/global_temp.out b/src/test/regress/expected/global_temp.out
new file mode 100644
index 0000000..ae1adb6
--- /dev/null
+++ b/src/test/regress/expected/global_temp.out
@@ -0,0 +1,247 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+-- Test ON COMMIT DELETE ROWS
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+   2
+(2 rows)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+(1 row)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+ col 
+-----
+   1
+(1 row)
+
+SELECT * FROM global_temptest2;
+ col 
+-----
+(0 rows)
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+ERROR:  unsupported ON COMMIT and foreign key combination
+DETAIL:  Table "global_temptest4" references "global_temptest3", but they do not have the same ON COMMIT setting.
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+ a 
+---
+(0 rows)
+
+DROP TABLE temp_parted_oncommit;
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+              relname              
+-----------------------------------
+ global_temp_parted_oncommit_test
+ global_temp_parted_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_parted_oncommit_test;
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+            relname             
+--------------------------------
+ global_temp_inh_oncommit_test
+ global_temp_inh_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ERROR:  cannot inherit from temporary relation "global_temp_table"
+ROLLBACK;
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM global_temp_table;
+ a 
+---
+ 1
+(1 row)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+(2 rows)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       1
+(1 row)
+
+\c
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+(0 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       2
+(1 row)
+
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       3
+(1 row)
+
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
diff --git a/src/test/regress/expected/session_table.out b/src/test/regress/expected/session_table.out
new file mode 100644
index 0000000..1b9b3f4
--- /dev/null
+++ b/src/test/regress/expected/session_table.out
@@ -0,0 +1,64 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+ count 
+-------
+ 10000
+(1 row)
+
+\c
+select count(*) from my_private_table;
+ count 
+-------
+     0
+(1 row)
+
+select * from my_private_table where x=10001;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select * from my_private_table where y=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select count(*) from my_private_table;
+ count  
+--------
+ 100000
+(1 row)
+
+\c
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+   x    |   y    
+--------+--------
+ 100000 | 100000
+(1 row)
+
+drop table  my_private_table;
diff --git a/src/test/regress/parallel_schedule b/src/test/regress/parallel_schedule
index fc0f141..507cf7d 100644
--- a/src/test/regress/parallel_schedule
+++ b/src/test/regress/parallel_schedule
@@ -107,7 +107,7 @@ test: json jsonb json_encoding jsonpath jsonpath_encoding jsonb_jsonpath
 # NB: temp.sql does a reconnect which transiently uses 2 connections,
 # so keep this parallel group to at most 19 tests
 # ----------
-test: plancache limit plpgsql copy2 temp domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
+test: plancache limit plpgsql copy2 temp global_temp session_table domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
 
 # ----------
 # Another group of parallel tests
diff --git a/src/test/regress/serial_schedule b/src/test/regress/serial_schedule
index 68ac56a..3890777 100644
--- a/src/test/regress/serial_schedule
+++ b/src/test/regress/serial_schedule
@@ -172,6 +172,8 @@ test: limit
 test: plpgsql
 test: copy2
 test: temp
+test: global_temp
+test: session_table
 test: domain
 test: rangefuncs
 test: prepare
diff --git a/src/test/regress/sql/global_temp.sql b/src/test/regress/sql/global_temp.sql
new file mode 100644
index 0000000..3058b9b
--- /dev/null
+++ b/src/test/regress/sql/global_temp.sql
@@ -0,0 +1,151 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+
+-- Test ON COMMIT DELETE ROWS
+
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+SELECT * FROM global_temptest2;
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+DROP TABLE temp_parted_oncommit;
+
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+DROP TABLE global_temp_parted_oncommit_test;
+
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ROLLBACK;
+
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+COMMIT;
+SELECT * FROM global_temp_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+COMMIT;
+SELECT * FROM normal_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+\c
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
diff --git a/src/test/regress/sql/session_table.sql b/src/test/regress/sql/session_table.sql
new file mode 100644
index 0000000..c6663dc
--- /dev/null
+++ b/src/test/regress/sql/session_table.sql
@@ -0,0 +1,18 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+\c
+select count(*) from my_private_table;
+select * from my_private_table where x=10001;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+select * from my_private_table where y=10001;
+select count(*) from my_private_table;
+\c
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+drop table  my_private_table;

diff --git a/contrib/pg_buffercache/pg_buffercache_pages.c b/contrib/pg_buffercache/pg_buffercache_pages.c
index 1bd579f..2d93f6f 100644
--- a/contrib/pg_buffercache/pg_buffercache_pages.c
+++ b/contrib/pg_buffercache/pg_buffercache_pages.c
@@ -153,9 +153,9 @@ pg_buffercache_pages(PG_FUNCTION_ARGS)
 			buf_state = LockBufHdr(bufHdr);
 
 			fctx->record[i].bufferid = BufferDescriptorGetBuffer(bufHdr);
-			fctx->record[i].relfilenode = bufHdr->tag.rnode.relNode;
-			fctx->record[i].reltablespace = bufHdr->tag.rnode.spcNode;
-			fctx->record[i].reldatabase = bufHdr->tag.rnode.dbNode;
+			fctx->record[i].relfilenode = bufHdr->tag.rnode.node.relNode;
+			fctx->record[i].reltablespace = bufHdr->tag.rnode.node.spcNode;
+			fctx->record[i].reldatabase = bufHdr->tag.rnode.node.dbNode;
 			fctx->record[i].forknum = bufHdr->tag.forkNum;
 			fctx->record[i].blocknum = bufHdr->tag.blockNum;
 			fctx->record[i].usagecount = BUF_STATE_GET_USAGECOUNT(buf_state);
diff --git a/contrib/pg_prewarm/autoprewarm.c b/contrib/pg_prewarm/autoprewarm.c
index 38ae240..8a04954 100644
--- a/contrib/pg_prewarm/autoprewarm.c
+++ b/contrib/pg_prewarm/autoprewarm.c
@@ -608,9 +608,9 @@ apw_dump_now(bool is_bgworker, bool dump_unlogged)
 		if (buf_state & BM_TAG_VALID &&
 			((buf_state & BM_PERMANENT) || dump_unlogged))
 		{
-			block_info_array[num_blocks].database = bufHdr->tag.rnode.dbNode;
-			block_info_array[num_blocks].tablespace = bufHdr->tag.rnode.spcNode;
-			block_info_array[num_blocks].filenode = bufHdr->tag.rnode.relNode;
+			block_info_array[num_blocks].database = bufHdr->tag.rnode.node.dbNode;
+			block_info_array[num_blocks].tablespace = bufHdr->tag.rnode.node.spcNode;
+			block_info_array[num_blocks].filenode = bufHdr->tag.rnode.node.relNode;
 			block_info_array[num_blocks].forknum = bufHdr->tag.forkNum;
 			block_info_array[num_blocks].blocknum = bufHdr->tag.blockNum;
 			++num_blocks;
diff --git a/src/backend/access/gin/ginxlog.c b/src/backend/access/gin/ginxlog.c
index c945b28..14d4e48 100644
--- a/src/backend/access/gin/ginxlog.c
+++ b/src/backend/access/gin/ginxlog.c
@@ -95,13 +95,13 @@ ginRedoInsertEntry(Buffer buffer, bool isLeaf, BlockNumber rightblkno, void *rda
 
 	if (PageAddItem(page, (Item) itup, IndexTupleSize(itup), offset, false, false) == InvalidOffsetNumber)
 	{
-		RelFileNode node;
+		RelFileNodeBackend rnode;
 		ForkNumber	forknum;
 		BlockNumber blknum;
 
-		BufferGetTag(buffer, &node, &forknum, &blknum);
+		BufferGetTag(buffer, &rnode, &forknum, &blknum);
 		elog(ERROR, "failed to add item to index page in %u/%u/%u",
-			 node.spcNode, node.dbNode, node.relNode);
+			 rnode.node.spcNode, rnode.node.dbNode, rnode.node.relNode);
 	}
 }
 
diff --git a/src/backend/access/gist/gistutil.c b/src/backend/access/gist/gistutil.c
index 9726020..389466e 100644
--- a/src/backend/access/gist/gistutil.c
+++ b/src/backend/access/gist/gistutil.c
@@ -1028,7 +1028,8 @@ gistGetFakeLSN(Relation rel)
 {
 	static XLogRecPtr counter = FirstNormalUnloggedLSN;
 
-	if (rel->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
+	if (rel->rd_rel->relpersistence == RELPERSISTENCE_TEMP ||
+		rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
 	{
 		/*
 		 * Temporary relations are only accessible in our session, so a simple
diff --git a/src/backend/access/heap/heapam_handler.c b/src/backend/access/heap/heapam_handler.c
index 09bc6fe..c60effd 100644
--- a/src/backend/access/heap/heapam_handler.c
+++ b/src/backend/access/heap/heapam_handler.c
@@ -671,6 +671,7 @@ heapam_relation_copy_data(Relation rel, const RelFileNode *newrnode)
 			 * init fork of an unlogged relation.
 			 */
 			if (rel->rd_rel->relpersistence == RELPERSISTENCE_PERMANENT ||
+				rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ||
 				(rel->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED &&
 				 forkNum == INIT_FORKNUM))
 				log_smgrcreate(newrnode, forkNum);
diff --git a/src/backend/access/nbtree/nbtpage.c b/src/backend/access/nbtree/nbtpage.c
index 5962126..60f4696 100644
--- a/src/backend/access/nbtree/nbtpage.c
+++ b/src/backend/access/nbtree/nbtpage.c
@@ -763,7 +763,11 @@ _bt_getbuf(Relation rel, BlockNumber blkno, int access)
 		/* Read an existing block of the relation */
 		buf = ReadBuffer(rel, blkno);
 		LockBuffer(buf, access);
-		_bt_checkpage(rel, buf);
+		/* Session temporary relation may be not yet initialized for this backend. */
+		if (blkno == BTREE_METAPAGE && PageIsNew(BufferGetPage(buf)) && IsSessionRelationBackendId(rel->rd_backend))
+			_bt_initmetapage(BufferGetPage(buf), P_NONE, 0);
+		else
+			_bt_checkpage(rel, buf);
 	}
 	else
 	{
diff --git a/src/backend/access/transam/xloginsert.c b/src/backend/access/transam/xloginsert.c
index 3ec67d4..edec8ca 100644
--- a/src/backend/access/transam/xloginsert.c
+++ b/src/backend/access/transam/xloginsert.c
@@ -213,6 +213,7 @@ void
 XLogRegisterBuffer(uint8 block_id, Buffer buffer, uint8 flags)
 {
 	registered_buffer *regbuf;
+	RelFileNodeBackend rnode;
 
 	/* NO_IMAGE doesn't make sense with FORCE_IMAGE */
 	Assert(!((flags & REGBUF_FORCE_IMAGE) && (flags & (REGBUF_NO_IMAGE))));
@@ -227,7 +228,8 @@ XLogRegisterBuffer(uint8 block_id, Buffer buffer, uint8 flags)
 
 	regbuf = &registered_buffers[block_id];
 
-	BufferGetTag(buffer, &regbuf->rnode, &regbuf->forkno, &regbuf->block);
+	BufferGetTag(buffer, &rnode, &regbuf->forkno, &regbuf->block);
+	regbuf->rnode = rnode.node;
 	regbuf->page = BufferGetPage(buffer);
 	regbuf->flags = flags;
 	regbuf->rdata_tail = (XLogRecData *) &regbuf->rdata_head;
@@ -919,7 +921,7 @@ XLogSaveBufferForHint(Buffer buffer, bool buffer_std)
 		int			flags;
 		PGAlignedBlock copied_buffer;
 		char	   *origdata = (char *) BufferGetBlock(buffer);
-		RelFileNode rnode;
+		RelFileNodeBackend rnode;
 		ForkNumber	forkno;
 		BlockNumber blkno;
 
@@ -948,7 +950,7 @@ XLogSaveBufferForHint(Buffer buffer, bool buffer_std)
 			flags |= REGBUF_STANDARD;
 
 		BufferGetTag(buffer, &rnode, &forkno, &blkno);
-		XLogRegisterBlock(0, &rnode, forkno, blkno, copied_buffer.data, flags);
+		XLogRegisterBlock(0, &rnode.node, forkno, blkno, copied_buffer.data, flags);
 
 		recptr = XLogInsert(RM_XLOG_ID, XLOG_FPI_FOR_HINT);
 	}
@@ -1009,7 +1011,7 @@ XLogRecPtr
 log_newpage_buffer(Buffer buffer, bool page_std)
 {
 	Page		page = BufferGetPage(buffer);
-	RelFileNode rnode;
+	RelFileNodeBackend rnode;
 	ForkNumber	forkNum;
 	BlockNumber blkno;
 
@@ -1018,7 +1020,7 @@ log_newpage_buffer(Buffer buffer, bool page_std)
 
 	BufferGetTag(buffer, &rnode, &forkNum, &blkno);
 
-	return log_newpage(&rnode, forkNum, blkno, page, page_std);
+	return log_newpage(&rnode.node, forkNum, blkno, page, page_std);
 }
 
 /*
diff --git a/src/backend/catalog/catalog.c b/src/backend/catalog/catalog.c
index a065419..8814afb 100644
--- a/src/backend/catalog/catalog.c
+++ b/src/backend/catalog/catalog.c
@@ -409,6 +409,9 @@ GetNewRelFileNode(Oid reltablespace, Relation pg_class, char relpersistence)
 		case RELPERSISTENCE_TEMP:
 			backend = BackendIdForTempRelations();
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 99ae159..24b2438 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3612,7 +3612,7 @@ reindex_relation(Oid relid, int flags, int options)
 		if (flags & REINDEX_REL_FORCE_INDEXES_UNLOGGED)
 			persistence = RELPERSISTENCE_UNLOGGED;
 		else if (flags & REINDEX_REL_FORCE_INDEXES_PERMANENT)
-			persistence = RELPERSISTENCE_PERMANENT;
+			persistence = rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ? RELPERSISTENCE_SESSION : RELPERSISTENCE_PERMANENT;
 		else
 			persistence = rel->rd_rel->relpersistence;
 
diff --git a/src/backend/catalog/storage.c b/src/backend/catalog/storage.c
index 3cc886f..a111ddc 100644
--- a/src/backend/catalog/storage.c
+++ b/src/backend/catalog/storage.c
@@ -93,6 +93,10 @@ RelationCreateStorage(RelFileNode rnode, char relpersistence)
 			backend = InvalidBackendId;
 			needs_wal = false;
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			needs_wal = false;
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
 			needs_wal = true;
diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index cedb4ee..d11c5b3 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -1400,7 +1400,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap,
 	 */
 	if (newrelpersistence == RELPERSISTENCE_UNLOGGED)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_UNLOGGED;
-	else if (newrelpersistence == RELPERSISTENCE_PERMANENT)
+	else if (newrelpersistence != RELPERSISTENCE_TEMP)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_PERMANENT;
 
 	/* Report that we are now reindexing relations */
diff --git a/src/backend/commands/sequence.c b/src/backend/commands/sequence.c
index 0960b33..d700650 100644
--- a/src/backend/commands/sequence.c
+++ b/src/backend/commands/sequence.c
@@ -94,7 +94,7 @@ static HTAB *seqhashtab = NULL; /* hash table for SeqTable items */
  */
 static SeqTableData *last_used_seq = NULL;
 
-static void fill_seq_with_data(Relation rel, HeapTuple tuple);
+static void fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf);
 static Relation lock_and_open_sequence(SeqTable seq);
 static void create_seq_hashtable(void);
 static void init_sequence(Oid relid, SeqTable *p_elm, Relation *p_rel);
@@ -222,7 +222,7 @@ DefineSequence(ParseState *pstate, CreateSeqStmt *seq)
 
 	/* now initialize the sequence's data */
 	tuple = heap_form_tuple(tupDesc, value, null);
-	fill_seq_with_data(rel, tuple);
+	fill_seq_with_data(rel, tuple, InvalidBuffer);
 
 	/* process OWNED BY if given */
 	if (owned_by)
@@ -327,7 +327,7 @@ ResetSequence(Oid seq_relid)
 	/*
 	 * Insert the modified tuple into the new storage file.
 	 */
-	fill_seq_with_data(seq_rel, tuple);
+	fill_seq_with_data(seq_rel, tuple, InvalidBuffer);
 
 	/* Clear local cache so that we don't think we have cached numbers */
 	/* Note that we do not change the currval() state */
@@ -340,18 +340,21 @@ ResetSequence(Oid seq_relid)
  * Initialize a sequence's relation with the specified tuple as content
  */
 static void
-fill_seq_with_data(Relation rel, HeapTuple tuple)
+fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf)
 {
-	Buffer		buf;
 	Page		page;
 	sequence_magic *sm;
 	OffsetNumber offnum;
+	bool lockBuffer = false;
 
 	/* Initialize first page of relation with special magic number */
 
-	buf = ReadBuffer(rel, P_NEW);
-	Assert(BufferGetBlockNumber(buf) == 0);
-
+	if (buf == InvalidBuffer)
+	{
+		buf = ReadBuffer(rel, P_NEW);
+		Assert(BufferGetBlockNumber(buf) == 0);
+		lockBuffer = true;
+	}
 	page = BufferGetPage(buf);
 
 	PageInit(page, BufferGetPageSize(buf), sizeof(sequence_magic));
@@ -360,7 +363,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	/* Now insert sequence tuple */
 
-	LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
+	if (lockBuffer)
+		LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
 
 	/*
 	 * Since VACUUM does not process sequences, we have to force the tuple to
@@ -410,7 +414,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	END_CRIT_SECTION();
 
-	UnlockReleaseBuffer(buf);
+	if (lockBuffer)
+		UnlockReleaseBuffer(buf);
 }
 
 /*
@@ -502,7 +507,7 @@ AlterSequence(ParseState *pstate, AlterSeqStmt *stmt)
 		/*
 		 * Insert the modified tuple into the new storage file.
 		 */
-		fill_seq_with_data(seqrel, newdatatuple);
+		fill_seq_with_data(seqrel, newdatatuple, InvalidBuffer);
 	}
 
 	/* process OWNED BY if given */
@@ -1178,6 +1183,17 @@ read_seq_tuple(Relation rel, Buffer *buf, HeapTuple seqdatatuple)
 	LockBuffer(*buf, BUFFER_LOCK_EXCLUSIVE);
 
 	page = BufferGetPage(*buf);
+	if (rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION && PageIsNew(page))
+	{
+		/* Initialize sequence for global temporary tables */
+		Datum		value[SEQ_COL_LASTCOL] = {0};
+		bool		null[SEQ_COL_LASTCOL] = {false};
+		HeapTuple tuple;
+		value[SEQ_COL_LASTVAL-1] = Int64GetDatumFast(1); /* start sequence with 1 */
+		tuple = heap_form_tuple(RelationGetDescr(rel), value, null);
+		fill_seq_with_data(rel, tuple, *buf);
+	}
+
 	sm = (sequence_magic *) PageGetSpecialPointer(page);
 
 	if (sm->magic != SEQ_MAGIC)
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index fb2be10..a7d0e99 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -586,7 +586,8 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 	 * Check consistency of arguments
 	 */
 	if (stmt->oncommit != ONCOMMIT_NOOP
-		&& stmt->relation->relpersistence != RELPERSISTENCE_TEMP)
+		&& stmt->relation->relpersistence != RELPERSISTENCE_TEMP
+		&& stmt->relation->relpersistence != RELPERSISTENCE_SESSION)
 		ereport(ERROR,
 				(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 				 errmsg("ON COMMIT can only be used on temporary tables")));
@@ -1772,7 +1773,8 @@ ExecuteTruncateGuts(List *explicit_rels, List *relids, List *relids_logged,
 		 * table or the current physical file to be thrown away anyway.
 		 */
 		if (rel->rd_createSubid == mySubid ||
-			rel->rd_newRelfilenodeSubid == mySubid)
+			rel->rd_newRelfilenodeSubid == mySubid ||
+			rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
 		{
 			/* Immediate, non-rollbackable truncation is OK */
 			heap_truncate_one_rel(rel);
@@ -7678,6 +7680,12 @@ ATAddForeignKeyConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
 						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 						 errmsg("constraints on unlogged tables may reference only permanent or unlogged tables")));
 			break;
+		case RELPERSISTENCE_SESSION:
+			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
+				ereport(ERROR,
+						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+						 errmsg("constraints on session tables may reference only session tables")));
+			break;
 		case RELPERSISTENCE_TEMP:
 			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_TEMP)
 				ereport(ERROR,
@@ -14082,6 +14090,13 @@ ATPrepChangePersistence(Relation rel, bool toLogged)
 							RelationGetRelationName(rel)),
 					 errtable(rel)));
 			break;
+		case RELPERSISTENCE_SESSION:
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+					 errmsg("cannot change logged status of session table \"%s\"",
+							RelationGetRelationName(rel)),
+					 errtable(rel)));
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			if (toLogged)
 				/* nothing to do */
@@ -14569,14 +14584,7 @@ PreCommit_on_commit_actions(void)
 				/* Do nothing (there shouldn't be such entries, actually) */
 				break;
 			case ONCOMMIT_DELETE_ROWS:
-
-				/*
-				 * If this transaction hasn't accessed any temporary
-				 * relations, we can skip truncating ON COMMIT DELETE ROWS
-				 * tables, as they must still be empty.
-				 */
-				if ((MyXactFlags & XACT_FLAGS_ACCESSEDTEMPNAMESPACE))
-					oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
+				oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
 				break;
 			case ONCOMMIT_DROP:
 				oids_to_drop = lappend_oid(oids_to_drop, oc->relid);
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index c97bb36..f9b2000 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -3265,20 +3265,11 @@ OptTemp:	TEMPORARY					{ $$ = RELPERSISTENCE_TEMP; }
 			| TEMP						{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMPORARY			{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMP				{ $$ = RELPERSISTENCE_TEMP; }
-			| GLOBAL TEMPORARY
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
-			| GLOBAL TEMP
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
+			| GLOBAL TEMPORARY          { $$ = RELPERSISTENCE_SESSION; }
+			| GLOBAL TEMP               { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION                   { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMPORARY         { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMP              { $$ = RELPERSISTENCE_SESSION; }
 			| UNLOGGED					{ $$ = RELPERSISTENCE_UNLOGGED; }
 			| /*EMPTY*/					{ $$ = RELPERSISTENCE_PERMANENT; }
 		;
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index a9b2f8b..2f261b9 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -437,6 +437,14 @@ generateSerialExtraStmts(CreateStmtContext *cxt, ColumnDef *column,
 	seqstmt->options = seqoptions;
 
 	/*
+	 * Why we should not always use persistence of parent table?
+	 * Although it is prohibited to have unlogged sequences,
+	 * unlogged tables with SERIAL fields are accepted!
+	 */
+	if (cxt->relation->relpersistence != RELPERSISTENCE_UNLOGGED)
+		seqstmt->sequence->relpersistence = cxt->relation->relpersistence;
+
+	/*
 	 * If a sequence data type was specified, add it to the options.  Prepend
 	 * to the list rather than append; in case a user supplied their own AS
 	 * clause, the "redundant options" error will point to their occurrence,
diff --git a/src/backend/postmaster/autovacuum.c b/src/backend/postmaster/autovacuum.c
index 073f313..ae8b7fd 100644
--- a/src/backend/postmaster/autovacuum.c
+++ b/src/backend/postmaster/autovacuum.c
@@ -2069,7 +2069,8 @@ do_autovacuum(void)
 		 * Check if it is a temp table (presumably, of some other backend's).
 		 * We cannot safely process other backends' temp tables.
 		 */
-		if (classForm->relpersistence == RELPERSISTENCE_TEMP)
+		if (classForm->relpersistence == RELPERSISTENCE_TEMP ||
+			classForm->relpersistence == RELPERSISTENCE_SESSION)
 		{
 			/*
 			 * We just ignore it if the owning backend is still active and
@@ -2154,7 +2155,8 @@ do_autovacuum(void)
 		/*
 		 * We cannot safely process other backends' temp tables, so skip 'em.
 		 */
-		if (classForm->relpersistence == RELPERSISTENCE_TEMP)
+		if (classForm->relpersistence == RELPERSISTENCE_TEMP ||
+			classForm->relpersistence == RELPERSISTENCE_SESSION)
 			continue;
 
 		relid = classForm->oid;
diff --git a/src/backend/replication/logical/reorderbuffer.c b/src/backend/replication/logical/reorderbuffer.c
index e8ffa04..2004d2f 100644
--- a/src/backend/replication/logical/reorderbuffer.c
+++ b/src/backend/replication/logical/reorderbuffer.c
@@ -3483,6 +3483,7 @@ ResolveCminCmaxDuringDecoding(HTAB *tuplecid_data,
 {
 	ReorderBufferTupleCidKey key;
 	ReorderBufferTupleCidEnt *ent;
+	RelFileNodeBackend rnode;
 	ForkNumber	forkno;
 	BlockNumber blockno;
 	bool		updated_mapping = false;
@@ -3496,7 +3497,8 @@ ResolveCminCmaxDuringDecoding(HTAB *tuplecid_data,
 	 * get relfilenode from the buffer, no convenient way to access it other
 	 * than that.
 	 */
-	BufferGetTag(buffer, &key.relnode, &forkno, &blockno);
+	BufferGetTag(buffer, &rnode, &forkno, &blockno);
+	key.relnode = rnode.node;
 
 	/* tuples can only be in the main fork */
 	Assert(forkno == MAIN_FORKNUM);
diff --git a/src/backend/storage/buffer/bufmgr.c b/src/backend/storage/buffer/bufmgr.c
index 6f3a402..76ce953 100644
--- a/src/backend/storage/buffer/bufmgr.c
+++ b/src/backend/storage/buffer/bufmgr.c
@@ -556,7 +556,7 @@ PrefetchBuffer(Relation reln, ForkNumber forkNum, BlockNumber blockNum)
 		int			buf_id;
 
 		/* create a tag so we can lookup the buffer */
-		INIT_BUFFERTAG(newTag, reln->rd_smgr->smgr_rnode.node,
+		INIT_BUFFERTAG(newTag, reln->rd_smgr->smgr_rnode,
 					   forkNum, blockNum);
 
 		/* determine its hash code and partition lock ID */
@@ -710,7 +710,7 @@ ReadBuffer_common(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
 	Block		bufBlock;
 	bool		found;
 	bool		isExtend;
-	bool		isLocalBuf = SmgrIsTemp(smgr);
+	bool		isLocalBuf = SmgrIsTemp(smgr) && relpersistence == RELPERSISTENCE_TEMP;
 
 	*hit = false;
 
@@ -1010,7 +1010,7 @@ BufferAlloc(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
 	uint32		buf_state;
 
 	/* create a tag so we can lookup the buffer */
-	INIT_BUFFERTAG(newTag, smgr->smgr_rnode.node, forkNum, blockNum);
+	INIT_BUFFERTAG(newTag, smgr->smgr_rnode, forkNum, blockNum);
 
 	/* determine its hash code and partition lock ID */
 	newHash = BufTableHashCode(&newTag);
@@ -1532,7 +1532,8 @@ ReleaseAndReadBuffer(Buffer buffer,
 		{
 			bufHdr = GetLocalBufferDescriptor(-buffer - 1);
 			if (bufHdr->tag.blockNum == blockNum &&
-				RelFileNodeEquals(bufHdr->tag.rnode, relation->rd_node) &&
+				RelFileNodeEquals(bufHdr->tag.rnode.node, relation->rd_node) &&
+				bufHdr->tag.rnode.backend == relation->rd_backend &&
 				bufHdr->tag.forkNum == forkNum)
 				return buffer;
 			ResourceOwnerForgetBuffer(CurrentResourceOwner, buffer);
@@ -1543,7 +1544,8 @@ ReleaseAndReadBuffer(Buffer buffer,
 			bufHdr = GetBufferDescriptor(buffer - 1);
 			/* we have pin, so it's ok to examine tag without spinlock */
 			if (bufHdr->tag.blockNum == blockNum &&
-				RelFileNodeEquals(bufHdr->tag.rnode, relation->rd_node) &&
+				RelFileNodeEquals(bufHdr->tag.rnode.node, relation->rd_node) &&
+				bufHdr->tag.rnode.backend == relation->rd_backend &&
 				bufHdr->tag.forkNum == forkNum)
 				return buffer;
 			UnpinBuffer(bufHdr, true);
@@ -1845,8 +1847,8 @@ BufferSync(int flags)
 
 			item = &CkptBufferIds[num_to_scan++];
 			item->buf_id = buf_id;
-			item->tsId = bufHdr->tag.rnode.spcNode;
-			item->relNode = bufHdr->tag.rnode.relNode;
+			item->tsId = bufHdr->tag.rnode.node.spcNode;
+			item->relNode = bufHdr->tag.rnode.node.relNode;
 			item->forkNum = bufHdr->tag.forkNum;
 			item->blockNum = bufHdr->tag.blockNum;
 		}
@@ -2559,7 +2561,7 @@ PrintBufferLeakWarning(Buffer buffer)
 	}
 
 	/* theoretically we should lock the bufhdr here */
-	path = relpathbackend(buf->tag.rnode, backend, buf->tag.forkNum);
+	path = relpathbackend(buf->tag.rnode.node, backend, buf->tag.forkNum);
 	buf_state = pg_atomic_read_u32(&buf->state);
 	elog(WARNING,
 		 "buffer refcount leak: [%03d] "
@@ -2631,7 +2633,7 @@ BufferGetBlockNumber(Buffer buffer)
  *		a buffer.
  */
 void
-BufferGetTag(Buffer buffer, RelFileNode *rnode, ForkNumber *forknum,
+BufferGetTag(Buffer buffer, RelFileNodeBackend *rnode, ForkNumber *forknum,
 			 BlockNumber *blknum)
 {
 	BufferDesc *bufHdr;
@@ -2696,7 +2698,7 @@ FlushBuffer(BufferDesc *buf, SMgrRelation reln)
 
 	/* Find smgr relation for buffer */
 	if (reln == NULL)
-		reln = smgropen(buf->tag.rnode, InvalidBackendId);
+		reln = smgropen(buf->tag.rnode.node, buf->tag.rnode.backend);
 
 	TRACE_POSTGRESQL_BUFFER_FLUSH_START(buf->tag.forkNum,
 										buf->tag.blockNum,
@@ -2930,7 +2932,7 @@ DropRelFileNodeBuffers(RelFileNodeBackend rnode, ForkNumber forkNum,
 	int			i;
 
 	/* If it's a local relation, it's localbuf.c's problem. */
-	if (RelFileNodeBackendIsTemp(rnode))
+	if (RelFileNodeBackendIsLocalTemp(rnode))
 	{
 		if (rnode.backend == MyBackendId)
 			DropRelFileNodeLocalBuffers(rnode.node, forkNum, firstDelBlock);
@@ -2958,11 +2960,11 @@ DropRelFileNodeBuffers(RelFileNodeBackend rnode, ForkNumber forkNum,
 		 * We could check forkNum and blockNum as well as the rnode, but the
 		 * incremental win from doing so seems small.
 		 */
-		if (!RelFileNodeEquals(bufHdr->tag.rnode, rnode.node))
+		if (!RelFileNodeBackendEquals(bufHdr->tag.rnode, rnode))
 			continue;
 
 		buf_state = LockBufHdr(bufHdr);
-		if (RelFileNodeEquals(bufHdr->tag.rnode, rnode.node) &&
+		if (RelFileNodeBackendEquals(bufHdr->tag.rnode, rnode) &&
 			bufHdr->tag.forkNum == forkNum &&
 			bufHdr->tag.blockNum >= firstDelBlock)
 			InvalidateBuffer(bufHdr);	/* releases spinlock */
@@ -2985,24 +2987,24 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 {
 	int			i,
 				n = 0;
-	RelFileNode *nodes;
+	RelFileNodeBackend *nodes;
 	bool		use_bsearch;
 
 	if (nnodes == 0)
 		return;
 
-	nodes = palloc(sizeof(RelFileNode) * nnodes);	/* non-local relations */
+	nodes = palloc(sizeof(RelFileNodeBackend) * nnodes);	/* non-local relations */
 
 	/* If it's a local relation, it's localbuf.c's problem. */
 	for (i = 0; i < nnodes; i++)
 	{
-		if (RelFileNodeBackendIsTemp(rnodes[i]))
+		if (RelFileNodeBackendIsLocalTemp(rnodes[i]))
 		{
 			if (rnodes[i].backend == MyBackendId)
 				DropRelFileNodeAllLocalBuffers(rnodes[i].node);
 		}
 		else
-			nodes[n++] = rnodes[i].node;
+			nodes[n++] = rnodes[i];
 	}
 
 	/*
@@ -3025,11 +3027,11 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 
 	/* sort the list of rnodes if necessary */
 	if (use_bsearch)
-		pg_qsort(nodes, n, sizeof(RelFileNode), rnode_comparator);
+		pg_qsort(nodes, n, sizeof(RelFileNodeBackend), rnode_comparator);
 
 	for (i = 0; i < NBuffers; i++)
 	{
-		RelFileNode *rnode = NULL;
+		RelFileNodeBackend *rnode = NULL;
 		BufferDesc *bufHdr = GetBufferDescriptor(i);
 		uint32		buf_state;
 
@@ -3044,7 +3046,7 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 
 			for (j = 0; j < n; j++)
 			{
-				if (RelFileNodeEquals(bufHdr->tag.rnode, nodes[j]))
+				if (RelFileNodeBackendEquals(bufHdr->tag.rnode, nodes[j]))
 				{
 					rnode = &nodes[j];
 					break;
@@ -3054,7 +3056,7 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 		else
 		{
 			rnode = bsearch((const void *) &(bufHdr->tag.rnode),
-							nodes, n, sizeof(RelFileNode),
+							nodes, n, sizeof(RelFileNodeBackend),
 							rnode_comparator);
 		}
 
@@ -3063,7 +3065,7 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 			continue;
 
 		buf_state = LockBufHdr(bufHdr);
-		if (RelFileNodeEquals(bufHdr->tag.rnode, (*rnode)))
+		if (RelFileNodeBackendEquals(bufHdr->tag.rnode, (*rnode)))
 			InvalidateBuffer(bufHdr);	/* releases spinlock */
 		else
 			UnlockBufHdr(bufHdr, buf_state);
@@ -3102,11 +3104,11 @@ DropDatabaseBuffers(Oid dbid)
 		 * As in DropRelFileNodeBuffers, an unlocked precheck should be safe
 		 * and saves some cycles.
 		 */
-		if (bufHdr->tag.rnode.dbNode != dbid)
+		if (bufHdr->tag.rnode.node.dbNode != dbid)
 			continue;
 
 		buf_state = LockBufHdr(bufHdr);
-		if (bufHdr->tag.rnode.dbNode == dbid)
+		if (bufHdr->tag.rnode.node.dbNode == dbid)
 			InvalidateBuffer(bufHdr);	/* releases spinlock */
 		else
 			UnlockBufHdr(bufHdr, buf_state);
@@ -3136,7 +3138,7 @@ PrintBufferDescs(void)
 			 "[%02d] (freeNext=%d, rel=%s, "
 			 "blockNum=%u, flags=0x%x, refcount=%u %d)",
 			 i, buf->freeNext,
-			 relpathbackend(buf->tag.rnode, InvalidBackendId, buf->tag.forkNum),
+			 relpath(buf->tag.rnode, buf->tag.forkNum),
 			 buf->tag.blockNum, buf->flags,
 			 buf->refcount, GetPrivateRefCount(b));
 	}
@@ -3204,7 +3206,8 @@ FlushRelationBuffers(Relation rel)
 			uint32		buf_state;
 
 			bufHdr = GetLocalBufferDescriptor(i);
-			if (RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node) &&
+			if (RelFileNodeEquals(bufHdr->tag.rnode.node, rel->rd_node) &&
+				bufHdr->tag.rnode.backend == rel->rd_backend &&
 				((buf_state = pg_atomic_read_u32(&bufHdr->state)) &
 				 (BM_VALID | BM_DIRTY)) == (BM_VALID | BM_DIRTY))
 			{
@@ -3251,13 +3254,15 @@ FlushRelationBuffers(Relation rel)
 		 * As in DropRelFileNodeBuffers, an unlocked precheck should be safe
 		 * and saves some cycles.
 		 */
-		if (!RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node))
+		if (!RelFileNodeEquals(bufHdr->tag.rnode.node, rel->rd_node)
+			|| bufHdr->tag.rnode.backend != rel->rd_backend)
 			continue;
 
 		ReservePrivateRefCountEntry();
 
 		buf_state = LockBufHdr(bufHdr);
-		if (RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node) &&
+		if (RelFileNodeEquals(bufHdr->tag.rnode.node, rel->rd_node) &&
+			bufHdr->tag.rnode.backend == rel->rd_backend &&
 			(buf_state & (BM_VALID | BM_DIRTY)) == (BM_VALID | BM_DIRTY))
 		{
 			PinBuffer_Locked(bufHdr);
@@ -3305,13 +3310,13 @@ FlushDatabaseBuffers(Oid dbid)
 		 * As in DropRelFileNodeBuffers, an unlocked precheck should be safe
 		 * and saves some cycles.
 		 */
-		if (bufHdr->tag.rnode.dbNode != dbid)
+		if (bufHdr->tag.rnode.node.dbNode != dbid)
 			continue;
 
 		ReservePrivateRefCountEntry();
 
 		buf_state = LockBufHdr(bufHdr);
-		if (bufHdr->tag.rnode.dbNode == dbid &&
+		if (bufHdr->tag.rnode.node.dbNode == dbid &&
 			(buf_state & (BM_VALID | BM_DIRTY)) == (BM_VALID | BM_DIRTY))
 		{
 			PinBuffer_Locked(bufHdr);
@@ -4051,7 +4056,7 @@ AbortBufferIO(void)
 				/* Buffer is pinned, so we can read tag without spinlock */
 				char	   *path;
 
-				path = relpathperm(buf->tag.rnode, buf->tag.forkNum);
+				path = relpath(buf->tag.rnode, buf->tag.forkNum);
 				ereport(WARNING,
 						(errcode(ERRCODE_IO_ERROR),
 						 errmsg("could not write block %u of %s",
@@ -4075,7 +4080,7 @@ shared_buffer_write_error_callback(void *arg)
 	/* Buffer is pinned, so we can read the tag without locking the spinlock */
 	if (bufHdr != NULL)
 	{
-		char	   *path = relpathperm(bufHdr->tag.rnode, bufHdr->tag.forkNum);
+		char	   *path = relpath(bufHdr->tag.rnode, bufHdr->tag.forkNum);
 
 		errcontext("writing block %u of relation %s",
 				   bufHdr->tag.blockNum, path);
@@ -4093,7 +4098,7 @@ local_buffer_write_error_callback(void *arg)
 
 	if (bufHdr != NULL)
 	{
-		char	   *path = relpathbackend(bufHdr->tag.rnode, MyBackendId,
+		char	   *path = relpathbackend(bufHdr->tag.rnode.node, MyBackendId,
 										  bufHdr->tag.forkNum);
 
 		errcontext("writing block %u of relation %s",
@@ -4108,22 +4113,27 @@ local_buffer_write_error_callback(void *arg)
 static int
 rnode_comparator(const void *p1, const void *p2)
 {
-	RelFileNode n1 = *(const RelFileNode *) p1;
-	RelFileNode n2 = *(const RelFileNode *) p2;
+	RelFileNodeBackend n1 = *(const RelFileNodeBackend *) p1;
+	RelFileNodeBackend n2 = *(const RelFileNodeBackend *) p2;
 
-	if (n1.relNode < n2.relNode)
+	if (n1.node.relNode < n2.node.relNode)
 		return -1;
-	else if (n1.relNode > n2.relNode)
+	else if (n1.node.relNode > n2.node.relNode)
 		return 1;
 
-	if (n1.dbNode < n2.dbNode)
+	if (n1.node.dbNode < n2.node.dbNode)
 		return -1;
-	else if (n1.dbNode > n2.dbNode)
+	else if (n1.node.dbNode > n2.node.dbNode)
 		return 1;
 
-	if (n1.spcNode < n2.spcNode)
+	if (n1.node.spcNode < n2.node.spcNode)
 		return -1;
-	else if (n1.spcNode > n2.spcNode)
+	else if (n1.node.spcNode > n2.node.spcNode)
+		return 1;
+
+	if (n1.backend < n2.backend)
+		return -1;
+	else if (n1.backend > n2.backend)
 		return 1;
 	else
 		return 0;
@@ -4359,7 +4369,7 @@ IssuePendingWritebacks(WritebackContext *context)
 			next = &context->pending_writebacks[i + ahead + 1];
 
 			/* different file, stop */
-			if (!RelFileNodeEquals(cur->tag.rnode, next->tag.rnode) ||
+			if (!RelFileNodeBackendEquals(cur->tag.rnode, next->tag.rnode) ||
 				cur->tag.forkNum != next->tag.forkNum)
 				break;
 
@@ -4378,7 +4388,7 @@ IssuePendingWritebacks(WritebackContext *context)
 		i += ahead;
 
 		/* and finally tell the kernel to write the data to storage */
-		reln = smgropen(tag.rnode, InvalidBackendId);
+		reln = smgropen(tag.rnode.node, tag.rnode.backend);
 		smgrwriteback(reln, tag.forkNum, tag.blockNum, nblocks);
 	}
 
diff --git a/src/backend/storage/buffer/localbuf.c b/src/backend/storage/buffer/localbuf.c
index f5f6a29..6bd5ecb 100644
--- a/src/backend/storage/buffer/localbuf.c
+++ b/src/backend/storage/buffer/localbuf.c
@@ -68,7 +68,7 @@ LocalPrefetchBuffer(SMgrRelation smgr, ForkNumber forkNum,
 	BufferTag	newTag;			/* identity of requested block */
 	LocalBufferLookupEnt *hresult;
 
-	INIT_BUFFERTAG(newTag, smgr->smgr_rnode.node, forkNum, blockNum);
+	INIT_BUFFERTAG(newTag, smgr->smgr_rnode, forkNum, blockNum);
 
 	/* Initialize local buffers if first request in this session */
 	if (LocalBufHash == NULL)
@@ -111,7 +111,7 @@ LocalBufferAlloc(SMgrRelation smgr, ForkNumber forkNum, BlockNumber blockNum,
 	bool		found;
 	uint32		buf_state;
 
-	INIT_BUFFERTAG(newTag, smgr->smgr_rnode.node, forkNum, blockNum);
+	INIT_BUFFERTAG(newTag, smgr->smgr_rnode, forkNum, blockNum);
 
 	/* Initialize local buffers if first request in this session */
 	if (LocalBufHash == NULL)
@@ -209,7 +209,7 @@ LocalBufferAlloc(SMgrRelation smgr, ForkNumber forkNum, BlockNumber blockNum,
 		Page		localpage = (char *) LocalBufHdrGetBlock(bufHdr);
 
 		/* Find smgr relation for buffer */
-		oreln = smgropen(bufHdr->tag.rnode, MyBackendId);
+		oreln = smgropen(bufHdr->tag.rnode.node, MyBackendId);
 
 		PageSetChecksumInplace(localpage, bufHdr->tag.blockNum);
 
@@ -331,14 +331,14 @@ DropRelFileNodeLocalBuffers(RelFileNode rnode, ForkNumber forkNum,
 		buf_state = pg_atomic_read_u32(&bufHdr->state);
 
 		if ((buf_state & BM_TAG_VALID) &&
-			RelFileNodeEquals(bufHdr->tag.rnode, rnode) &&
+			RelFileNodeEquals(bufHdr->tag.rnode.node, rnode) &&
 			bufHdr->tag.forkNum == forkNum &&
 			bufHdr->tag.blockNum >= firstDelBlock)
 		{
 			if (LocalRefCount[i] != 0)
 				elog(ERROR, "block %u of %s is still referenced (local %u)",
 					 bufHdr->tag.blockNum,
-					 relpathbackend(bufHdr->tag.rnode, MyBackendId,
+					 relpathbackend(bufHdr->tag.rnode.node, MyBackendId,
 									bufHdr->tag.forkNum),
 					 LocalRefCount[i]);
 			/* Remove entry from hashtable */
@@ -377,12 +377,12 @@ DropRelFileNodeAllLocalBuffers(RelFileNode rnode)
 		buf_state = pg_atomic_read_u32(&bufHdr->state);
 
 		if ((buf_state & BM_TAG_VALID) &&
-			RelFileNodeEquals(bufHdr->tag.rnode, rnode))
+			RelFileNodeEquals(bufHdr->tag.rnode.node, rnode))
 		{
 			if (LocalRefCount[i] != 0)
 				elog(ERROR, "block %u of %s is still referenced (local %u)",
 					 bufHdr->tag.blockNum,
-					 relpathbackend(bufHdr->tag.rnode, MyBackendId,
+					 relpathbackend(bufHdr->tag.rnode.node, MyBackendId,
 									bufHdr->tag.forkNum),
 					 LocalRefCount[i]);
 			/* Remove entry from hashtable */
diff --git a/src/backend/storage/freespace/fsmpage.c b/src/backend/storage/freespace/fsmpage.c
index cf7f03f..65eb422 100644
--- a/src/backend/storage/freespace/fsmpage.c
+++ b/src/backend/storage/freespace/fsmpage.c
@@ -268,13 +268,13 @@ restart:
 			 *
 			 * Fix the corruption and restart.
 			 */
-			RelFileNode rnode;
+			RelFileNodeBackend rnode;
 			ForkNumber	forknum;
 			BlockNumber blknum;
 
 			BufferGetTag(buf, &rnode, &forknum, &blknum);
 			elog(DEBUG1, "fixing corrupt FSM block %u, relation %u/%u/%u",
-				 blknum, rnode.spcNode, rnode.dbNode, rnode.relNode);
+				 blknum, rnode.node.spcNode, rnode.node.dbNode, rnode.node.relNode);
 
 			/* make sure we hold an exclusive lock */
 			if (!exclusive_lock_held)
diff --git a/src/backend/storage/smgr/md.c b/src/backend/storage/smgr/md.c
index 07f3c93..204c4cb 100644
--- a/src/backend/storage/smgr/md.c
+++ b/src/backend/storage/smgr/md.c
@@ -33,6 +33,7 @@
 #include "postmaster/bgwriter.h"
 #include "storage/fd.h"
 #include "storage/bufmgr.h"
+#include "storage/ipc.h"
 #include "storage/md.h"
 #include "storage/relfilenode.h"
 #include "storage/smgr.h"
@@ -87,6 +88,18 @@ typedef struct _MdfdVec
 
 static MemoryContext MdCxt;		/* context for all MdfdVec objects */
 
+/*
+ * Structure used to collect information created by this backend.
+ * Data of this related should be deleted on backend exit.
+ */
+typedef struct SessionRelation
+{
+	RelFileNodeBackend rnode;
+	struct SessionRelation* next;
+} SessionRelation;
+
+
+static SessionRelation* SessionRelations;
 
 /* Populate a file tag describing an md.c segment file. */
 #define INIT_MD_FILETAG(a,xx_rnode,xx_forknum,xx_segno) \
@@ -152,6 +165,48 @@ mdinit(void)
 								  ALLOCSET_DEFAULT_SIZES);
 }
 
+
+/*
+ * Delete all data of session relations and remove their pages from shared buffers.
+ * This function is called on backend exit.
+ */
+static void
+TruncateSessionRelations(int code, Datum arg)
+{
+	SessionRelation* rel;
+	for (rel = SessionRelations; rel != NULL; rel = rel->next)
+	{
+		/* Remove relation pages from shared buffers */
+		DropRelFileNodesAllBuffers(&rel->rnode, 1);
+
+		/* Delete relation files */
+		mdunlink(rel->rnode, InvalidForkNumber, false);
+	}
+}
+
+/*
+ * Maintain information about session relations accessed by this backend.
+ * This list is needed to perform cleanup on backend exit.
+ * Session relation is linked in this list when this relation is created or opened and file doesn't exist.
+ * Such procedure guarantee that each relation is linked into list only once.
+ */
+static void
+RegisterSessionRelation(SMgrRelation reln)
+{
+	SessionRelation* rel = (SessionRelation*)MemoryContextAlloc(TopMemoryContext, sizeof(SessionRelation));
+
+	/*
+	 * Perform session relation cleanup on backend exit. We are using shared memory hook, because
+	 * cleanup should be performed before backend is disconnected from shared memory.
+	 */
+	if (SessionRelations == NULL)
+		on_shmem_exit(TruncateSessionRelations, 0);
+
+	rel->rnode = reln->smgr_rnode;
+	rel->next = SessionRelations;
+	SessionRelations = rel;
+}
+
 /*
  *	mdexists() -- Does the physical file exist?
  *
@@ -218,6 +273,8 @@ mdcreate(SMgrRelation reln, ForkNumber forkNum, bool isRedo)
 					 errmsg("could not create file \"%s\": %m", path)));
 		}
 	}
+	if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		RegisterSessionRelation(reln);
 
 	pfree(path);
 
@@ -465,6 +522,19 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 
 	if (fd < 0)
 	{
+		/*
+		 * In case of session relation access, there may be no yet files of this relation for this backend.
+		 * If so, then create file and register session relation for truncation on backend exit.
+		 */
+		if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
+			fd = PathNameOpenFile(path, O_RDWR | PG_BINARY | O_CREAT);
+			if (fd >= 0)
+			{
+				RegisterSessionRelation(reln);
+				goto NewSegment;
+			}
+		}
 		if ((behavior & EXTENSION_RETURN_NULL) &&
 			FILE_POSSIBLY_DELETED(errno))
 		{
@@ -476,6 +546,7 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 				 errmsg("could not open file \"%s\": %m", path)));
 	}
 
+  NewSegment:
 	pfree(path);
 
 	_fdvec_resize(reln, forknum, 1);
@@ -652,8 +723,13 @@ mdread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
 		 * complaining.  This allows, for example, the case of trying to
 		 * update a block that was later truncated away.
 		 */
-		if (zero_damaged_pages || InRecovery)
+		if (zero_damaged_pages || InRecovery || RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
 			MemSet(buffer, 0, BLCKSZ);
+			/* In case of session relation we need to write zero page to provide correct result of subsequent mdnblocks */
+			if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+				mdwrite(reln, forknum, blocknum, buffer, true);
+		}
 		else
 			ereport(ERROR,
 					(errcode(ERRCODE_DATA_CORRUPTED),
@@ -738,12 +814,18 @@ mdwrite(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
 BlockNumber
 mdnblocks(SMgrRelation reln, ForkNumber forknum)
 {
-	MdfdVec    *v = mdopenfork(reln, forknum, EXTENSION_FAIL);
+	/*
+	 * If we access session relation, there may be no files yet of this relation for this backend.
+	 * Pass EXTENSION_RETURN_NULL to make mdopen return NULL in this case instead of reporting error.
+	 */
+	MdfdVec    *v = mdopenfork(reln, forknum, RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode)
+							   ? EXTENSION_RETURN_NULL : EXTENSION_FAIL);
 	BlockNumber nblocks;
 	BlockNumber segno = 0;
 
 	/* mdopen has opened the first segment */
-	Assert(reln->md_num_open_segs[forknum] > 0);
+	if (reln->md_num_open_segs[forknum] == 0)
+		return 0;
 
 	/*
 	 * Start from the last open segments, to avoid redundant seeks.  We have
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index a87e721..2401361 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -994,6 +994,9 @@ pg_relation_filepath(PG_FUNCTION_ARGS)
 	/* Determine owning backend. */
 	switch (relform->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c
index 2488607..86e8fca 100644
--- a/src/backend/utils/cache/relcache.c
+++ b/src/backend/utils/cache/relcache.c
@@ -1098,6 +1098,10 @@ RelationBuildDesc(Oid targetRelId, bool insertIt)
 	relation->rd_newRelfilenodeSubid = InvalidSubTransactionId;
 	switch (relation->rd_rel->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			relation->rd_backend = BackendIdForSessionRelations();
+			relation->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			relation->rd_backend = InvalidBackendId;
@@ -3301,6 +3305,10 @@ RelationBuildLocalRelation(const char *relname,
 	rel->rd_rel->relpersistence = relpersistence;
 	switch (relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			rel->rd_backend = BackendIdForSessionRelations();
+			rel->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			rel->rd_backend = InvalidBackendId;
diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
index 0cc9ede..1dff0c8 100644
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -15593,8 +15593,8 @@ dumpTableSchema(Archive *fout, TableInfo *tbinfo)
 											 tbinfo->dobj.catId.oid, false);
 
 		appendPQExpBuffer(q, "CREATE %s%s %s",
-						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ?
-						  "UNLOGGED " : "",
+						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ? "UNLOGGED "
+						  : tbinfo->relpersistence == RELPERSISTENCE_SESSION ? "SESSION " : "",
 						  reltypename,
 						  qualrelname);
 
diff --git a/src/common/relpath.c b/src/common/relpath.c
index 62b9553..cef99d2 100644
--- a/src/common/relpath.c
+++ b/src/common/relpath.c
@@ -166,7 +166,18 @@ GetRelationPath(Oid dbNode, Oid spcNode, Oid relNode,
 		}
 		else
 		{
-			if (forkNumber != MAIN_FORKNUM)
+			/*
+			 * Session relations are distinguished from local temp relations by adding
+			 * SessionRelFirstBackendId offset to backendId.
+			 * These is no need to separate them at file system level, so just subtract SessionRelFirstBackendId
+			 * to avoid too long file names.
+			 * Segments of session relations have the same prefix (t%d_) as local temporary relations
+			 * to make it possible to cleanup them in the same way as local temporary relation files.
+			 */
+			 if (backendId >= SessionRelFirstBackendId)
+				 backendId -= SessionRelFirstBackendId;
+
+			 if (forkNumber != MAIN_FORKNUM)
 				path = psprintf("base/%u/t%d_%u_%s",
 								dbNode, backendId, relNode,
 								forkNames[forkNumber]);
diff --git a/src/include/catalog/pg_class.h b/src/include/catalog/pg_class.h
index 090b6ba..6a39663 100644
--- a/src/include/catalog/pg_class.h
+++ b/src/include/catalog/pg_class.h
@@ -165,6 +165,7 @@ typedef FormData_pg_class *Form_pg_class;
 #define		  RELPERSISTENCE_PERMANENT	'p' /* regular table */
 #define		  RELPERSISTENCE_UNLOGGED	'u' /* unlogged permanent table */
 #define		  RELPERSISTENCE_TEMP		't' /* temporary table */
+#define		  RELPERSISTENCE_SESSION	's' /* session table */
 
 /* default selection for replica identity (primary key or nothing) */
 #define		  REPLICA_IDENTITY_DEFAULT	'd'
diff --git a/src/include/storage/backendid.h b/src/include/storage/backendid.h
index 70ef8eb..f226e7c 100644
--- a/src/include/storage/backendid.h
+++ b/src/include/storage/backendid.h
@@ -22,6 +22,13 @@ typedef int BackendId;			/* unique currently active backend identifier */
 
 #define InvalidBackendId		(-1)
 
+/*
+ * We need to distinguish local and global temporary relations by RelFileNodeBackend.
+ * The least invasive change is to add some special bias value to backend id (since 
+ * maximal number of backed is limited by MaxBackends).
+ */
+#define SessionRelFirstBackendId (0x40000000)
+
 extern PGDLLIMPORT BackendId MyBackendId;	/* backend id of this backend */
 
 /* backend id of our parallel session leader, or InvalidBackendId if none */
@@ -34,4 +41,10 @@ extern PGDLLIMPORT BackendId ParallelMasterBackendId;
 #define BackendIdForTempRelations() \
 	(ParallelMasterBackendId == InvalidBackendId ? MyBackendId : ParallelMasterBackendId)
 
+
+#define BackendIdForSessionRelations() \
+	(BackendIdForTempRelations() + SessionRelFirstBackendId)
+
+#define IsSessionRelationBackendId(id) ((id) >= SessionRelFirstBackendId)
+
 #endif							/* BACKENDID_H */
diff --git a/src/include/storage/buf_internals.h b/src/include/storage/buf_internals.h
index df2dda7..7adb96b 100644
--- a/src/include/storage/buf_internals.h
+++ b/src/include/storage/buf_internals.h
@@ -90,16 +90,17 @@
  */
 typedef struct buftag
 {
-	RelFileNode rnode;			/* physical relation identifier */
+	RelFileNodeBackend rnode;			/* physical relation identifier */
 	ForkNumber	forkNum;
 	BlockNumber blockNum;		/* blknum relative to begin of reln */
 } BufferTag;
 
 #define CLEAR_BUFFERTAG(a) \
 ( \
-	(a).rnode.spcNode = InvalidOid, \
-	(a).rnode.dbNode = InvalidOid, \
-	(a).rnode.relNode = InvalidOid, \
+	(a).rnode.node.spcNode = InvalidOid, \
+	(a).rnode.node.dbNode = InvalidOid, \
+	(a).rnode.node.relNode = InvalidOid, \
+	(a).rnode.backend = InvalidBackendId, \
 	(a).forkNum = InvalidForkNumber, \
 	(a).blockNum = InvalidBlockNumber \
 )
@@ -113,7 +114,7 @@ typedef struct buftag
 
 #define BUFFERTAGS_EQUAL(a,b) \
 ( \
-	RelFileNodeEquals((a).rnode, (b).rnode) && \
+	RelFileNodeBackendEquals((a).rnode, (b).rnode) && \
 	(a).blockNum == (b).blockNum && \
 	(a).forkNum == (b).forkNum \
 )
diff --git a/src/include/storage/bufmgr.h b/src/include/storage/bufmgr.h
index 509f4b7..3315fa0 100644
--- a/src/include/storage/bufmgr.h
+++ b/src/include/storage/bufmgr.h
@@ -205,7 +205,7 @@ extern XLogRecPtr BufferGetLSNAtomic(Buffer buffer);
 extern void PrintPinnedBufs(void);
 #endif
 extern Size BufferShmemSize(void);
-extern void BufferGetTag(Buffer buffer, RelFileNode *rnode,
+extern void BufferGetTag(Buffer buffer, RelFileNodeBackend *rnode,
 						 ForkNumber *forknum, BlockNumber *blknum);
 
 extern void MarkBufferDirtyHint(Buffer buffer, bool buffer_std);
diff --git a/src/include/storage/relfilenode.h b/src/include/storage/relfilenode.h
index 586500a..20aec72 100644
--- a/src/include/storage/relfilenode.h
+++ b/src/include/storage/relfilenode.h
@@ -75,10 +75,25 @@ typedef struct RelFileNodeBackend
 	BackendId	backend;
 } RelFileNodeBackend;
 
+/*
+ * Check whether it is local or global temporary relation, which data belongs only to one backend.
+ */
 #define RelFileNodeBackendIsTemp(rnode) \
 	((rnode).backend != InvalidBackendId)
 
 /*
+ * Check whether it is global temporary relation which metadata is shared by all sessions,
+ * but data is private for the current session.
+ */
+#define RelFileNodeBackendIsGlobalTemp(rnode) IsSessionRelationBackendId((rnode).backend)
+
+/*
+ * Check whether it is local temporary relation which exists only in this backend.
+ */
+#define RelFileNodeBackendIsLocalTemp(rnode) \
+	(RelFileNodeBackendIsTemp(rnode) && !RelFileNodeBackendIsGlobalTemp(rnode))
+
+/*
  * Note: RelFileNodeEquals and RelFileNodeBackendEquals compare relNode first
  * since that is most likely to be different in two unequal RelFileNodes.  It
  * is probably redundant to compare spcNode if the other fields are found equal,
diff --git a/src/test/isolation/expected/inherit-global-temp.out b/src/test/isolation/expected/inherit-global-temp.out
new file mode 100644
index 0000000..6114f8c
--- /dev/null
+++ b/src/test/isolation/expected/inherit-global-temp.out
@@ -0,0 +1,218 @@
+Parsed test spec with 2 sessions
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_update_p s1_update_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_update_p: UPDATE inh_global_parent SET a = 11 WHERE a = 1;
+step s1_update_c: UPDATE inh_global_parent SET a = 13 WHERE a IN (3, 5);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+2              
+11             
+4              
+13             
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+4              
+13             
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+2              
+11             
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_update_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_update_c: UPDATE inh_global_parent SET a = 15 WHERE a IN (3, 5);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+6              
+15             
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+6              
+15             
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_delete_p s1_delete_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_delete_p: DELETE FROM inh_global_parent WHERE a = 2;
+step s1_delete_c: DELETE FROM inh_global_parent WHERE a IN (4, 6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+3              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_delete_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_delete_c: DELETE FROM inh_global_parent WHERE a IN (4, 6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+5              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_truncate_p s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_truncate_p s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_truncate_p: TRUNCATE inh_global_parent;
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_begin s1_truncate_p s2_select_p s1_commit
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_begin: BEGIN;
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s2_select_p: SELECT a FROM inh_global_parent; <waiting ...>
+step s1_commit: COMMIT;
+step s2_select_p: <... completed>
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_begin s1_truncate_p s2_select_c s1_commit
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_begin: BEGIN;
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2; <waiting ...>
+step s1_commit: COMMIT;
+step s2_select_c: <... completed>
+a              
+
+5              
+6              
diff --git a/src/test/isolation/isolation_schedule b/src/test/isolation/isolation_schedule
index 74b5077..44df4e0 100644
--- a/src/test/isolation/isolation_schedule
+++ b/src/test/isolation/isolation_schedule
@@ -85,3 +85,4 @@ test: plpgsql-toast
 test: truncate-conflict
 test: serializable-parallel
 test: serializable-parallel-2
+test: inherit-global-temp
diff --git a/src/test/isolation/specs/inherit-global-temp.spec b/src/test/isolation/specs/inherit-global-temp.spec
new file mode 100644
index 0000000..5e95dd6
--- /dev/null
+++ b/src/test/isolation/specs/inherit-global-temp.spec
@@ -0,0 +1,73 @@
+# This is a copy of the inherit-temp test with little changes for global temporary tables.
+#
+
+setup
+{
+  CREATE TABLE inh_global_parent (a int);
+}
+
+teardown
+{
+  DROP TABLE inh_global_parent;
+}
+
+# Session 1 executes actions which act directly on both the parent and
+# its child.  Abbreviation "c" is used for queries working on the child
+# and "p" on the parent.
+session "s1"
+setup
+{
+  CREATE GLOBAL TEMPORARY TABLE inh_global_temp_child_s1 () INHERITS (inh_global_parent);
+}
+step "s1_begin" { BEGIN; }
+step "s1_truncate_p" { TRUNCATE inh_global_parent; }
+step "s1_select_p" { SELECT a FROM inh_global_parent; }
+step "s1_select_c" { SELECT a FROM inh_global_temp_child_s1; }
+step "s1_insert_p" { INSERT INTO inh_global_parent VALUES (1), (2); }
+step "s1_insert_c" { INSERT INTO inh_global_temp_child_s1 VALUES (3), (4); }
+step "s1_update_p" { UPDATE inh_global_parent SET a = 11 WHERE a = 1; }
+step "s1_update_c" { UPDATE inh_global_parent SET a = 13 WHERE a IN (3, 5); }
+step "s1_delete_p" { DELETE FROM inh_global_parent WHERE a = 2; }
+step "s1_delete_c" { DELETE FROM inh_global_parent WHERE a IN (4, 6); }
+step "s1_commit" { COMMIT; }
+teardown
+{
+  DROP TABLE inh_global_temp_child_s1;
+}
+
+# Session 2 executes actions on the parent which act only on the child.
+session "s2"
+setup
+{
+  CREATE GLOBAL TEMPORARY TABLE inh_global_temp_child_s2 () INHERITS (inh_global_parent);
+}
+step "s2_truncate_p" { TRUNCATE inh_global_parent; }
+step "s2_select_p" { SELECT a FROM inh_global_parent; }
+step "s2_select_c" { SELECT a FROM inh_global_temp_child_s2; }
+step "s2_insert_c" { INSERT INTO inh_global_temp_child_s2 VALUES (5), (6); }
+step "s2_update_c" { UPDATE inh_global_parent SET a = 15 WHERE a IN (3, 5); }
+step "s2_delete_c" { DELETE FROM inh_global_parent WHERE a IN (4, 6); }
+teardown
+{
+  DROP TABLE inh_global_temp_child_s2;
+}
+
+# Check INSERT behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check UPDATE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_update_p" "s1_update_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_update_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check DELETE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_delete_p" "s1_delete_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_delete_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check TRUNCATE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_truncate_p" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_truncate_p" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# TRUNCATE on a parent tree does not block access to temporary child relation
+# of another session, and blocks when scanning the parent.
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_begin" "s1_truncate_p" "s2_select_p" "s1_commit"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_begin" "s1_truncate_p" "s2_select_c" "s1_commit"
diff --git a/src/test/regress/expected/global_temp.out b/src/test/regress/expected/global_temp.out
new file mode 100644
index 0000000..ae1adb6
--- /dev/null
+++ b/src/test/regress/expected/global_temp.out
@@ -0,0 +1,247 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+-- Test ON COMMIT DELETE ROWS
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+   2
+(2 rows)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+(1 row)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+ col 
+-----
+   1
+(1 row)
+
+SELECT * FROM global_temptest2;
+ col 
+-----
+(0 rows)
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+ERROR:  unsupported ON COMMIT and foreign key combination
+DETAIL:  Table "global_temptest4" references "global_temptest3", but they do not have the same ON COMMIT setting.
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+ a 
+---
+(0 rows)
+
+DROP TABLE temp_parted_oncommit;
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+              relname              
+-----------------------------------
+ global_temp_parted_oncommit_test
+ global_temp_parted_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_parted_oncommit_test;
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+            relname             
+--------------------------------
+ global_temp_inh_oncommit_test
+ global_temp_inh_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ERROR:  cannot inherit from temporary relation "global_temp_table"
+ROLLBACK;
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM global_temp_table;
+ a 
+---
+ 1
+(1 row)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+(2 rows)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       1
+(1 row)
+
+\c
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+(0 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       2
+(1 row)
+
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       3
+(1 row)
+
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
diff --git a/src/test/regress/expected/session_table.out b/src/test/regress/expected/session_table.out
new file mode 100644
index 0000000..1b9b3f4
--- /dev/null
+++ b/src/test/regress/expected/session_table.out
@@ -0,0 +1,64 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+ count 
+-------
+ 10000
+(1 row)
+
+\c
+select count(*) from my_private_table;
+ count 
+-------
+     0
+(1 row)
+
+select * from my_private_table where x=10001;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select * from my_private_table where y=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select count(*) from my_private_table;
+ count  
+--------
+ 100000
+(1 row)
+
+\c
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+   x    |   y    
+--------+--------
+ 100000 | 100000
+(1 row)
+
+drop table  my_private_table;
diff --git a/src/test/regress/parallel_schedule b/src/test/regress/parallel_schedule
index fc0f141..507cf7d 100644
--- a/src/test/regress/parallel_schedule
+++ b/src/test/regress/parallel_schedule
@@ -107,7 +107,7 @@ test: json jsonb json_encoding jsonpath jsonpath_encoding jsonb_jsonpath
 # NB: temp.sql does a reconnect which transiently uses 2 connections,
 # so keep this parallel group to at most 19 tests
 # ----------
-test: plancache limit plpgsql copy2 temp domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
+test: plancache limit plpgsql copy2 temp global_temp session_table domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
 
 # ----------
 # Another group of parallel tests
diff --git a/src/test/regress/serial_schedule b/src/test/regress/serial_schedule
index 68ac56a..3890777 100644
--- a/src/test/regress/serial_schedule
+++ b/src/test/regress/serial_schedule
@@ -172,6 +172,8 @@ test: limit
 test: plpgsql
 test: copy2
 test: temp
+test: global_temp
+test: session_table
 test: domain
 test: rangefuncs
 test: prepare
diff --git a/src/test/regress/sql/global_temp.sql b/src/test/regress/sql/global_temp.sql
new file mode 100644
index 0000000..3058b9b
--- /dev/null
+++ b/src/test/regress/sql/global_temp.sql
@@ -0,0 +1,151 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+
+-- Test ON COMMIT DELETE ROWS
+
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+SELECT * FROM global_temptest2;
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+DROP TABLE temp_parted_oncommit;
+
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+DROP TABLE global_temp_parted_oncommit_test;
+
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ROLLBACK;
+
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+COMMIT;
+SELECT * FROM global_temp_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+COMMIT;
+SELECT * FROM normal_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+\c
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
diff --git a/src/test/regress/sql/session_table.sql b/src/test/regress/sql/session_table.sql
new file mode 100644
index 0000000..c6663dc
--- /dev/null
+++ b/src/test/regress/sql/session_table.sql
@@ -0,0 +1,18 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+\c
+select count(*) from my_private_table;
+select * from my_private_table where x=10001;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+select * from my_private_table where y=10001;
+select count(*) from my_private_table;
+\c
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+drop table  my_private_table;

diff --git a/src/backend/access/gist/gistutil.c b/src/backend/access/gist/gistutil.c
index 9726020..389466e 100644
--- a/src/backend/access/gist/gistutil.c
+++ b/src/backend/access/gist/gistutil.c
@@ -1028,7 +1028,8 @@ gistGetFakeLSN(Relation rel)
 {
 	static XLogRecPtr counter = FirstNormalUnloggedLSN;
 
-	if (rel->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
+	if (rel->rd_rel->relpersistence == RELPERSISTENCE_TEMP ||
+		rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
 	{
 		/*
 		 * Temporary relations are only accessible in our session, so a simple
diff --git a/src/backend/access/heap/heapam_handler.c b/src/backend/access/heap/heapam_handler.c
index f1ff01e..e92d324 100644
--- a/src/backend/access/heap/heapam_handler.c
+++ b/src/backend/access/heap/heapam_handler.c
@@ -673,6 +673,7 @@ heapam_relation_copy_data(Relation rel, const RelFileNode *newrnode)
 			 * init fork of an unlogged relation.
 			 */
 			if (rel->rd_rel->relpersistence == RELPERSISTENCE_PERMANENT ||
+				rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ||
 				(rel->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED &&
 				 forkNum == INIT_FORKNUM))
 				log_smgrcreate(newrnode, forkNum);
diff --git a/src/backend/access/nbtree/nbtpage.c b/src/backend/access/nbtree/nbtpage.c
index 9c1f7de..e4a56f6 100644
--- a/src/backend/access/nbtree/nbtpage.c
+++ b/src/backend/access/nbtree/nbtpage.c
@@ -763,7 +763,11 @@ _bt_getbuf(Relation rel, BlockNumber blkno, int access)
 		/* Read an existing block of the relation */
 		buf = ReadBuffer(rel, blkno);
 		LockBuffer(buf, access);
-		_bt_checkpage(rel, buf);
+		/* Session temporary relation may be not yet initialized for this backend. */
+		if (blkno == BTREE_METAPAGE && PageIsNew(BufferGetPage(buf)) && IsSessionRelationBackendId(rel->rd_backend))
+			_bt_initmetapage(BufferGetPage(buf), P_NONE, 0);
+		else
+			_bt_checkpage(rel, buf);
 	}
 	else
 	{
diff --git a/src/backend/catalog/catalog.c b/src/backend/catalog/catalog.c
index a065419..8814afb 100644
--- a/src/backend/catalog/catalog.c
+++ b/src/backend/catalog/catalog.c
@@ -409,6 +409,9 @@ GetNewRelFileNode(Oid reltablespace, Relation pg_class, char relpersistence)
 		case RELPERSISTENCE_TEMP:
 			backend = BackendIdForTempRelations();
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 3e1d406..aaa2c49 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3590,7 +3590,7 @@ reindex_relation(Oid relid, int flags, int options)
 		if (flags & REINDEX_REL_FORCE_INDEXES_UNLOGGED)
 			persistence = RELPERSISTENCE_UNLOGGED;
 		else if (flags & REINDEX_REL_FORCE_INDEXES_PERMANENT)
-			persistence = RELPERSISTENCE_PERMANENT;
+			persistence = rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ? RELPERSISTENCE_SESSION : RELPERSISTENCE_PERMANENT;
 		else
 			persistence = rel->rd_rel->relpersistence;
 
diff --git a/src/backend/catalog/storage.c b/src/backend/catalog/storage.c
index 3cc886f..a111ddc 100644
--- a/src/backend/catalog/storage.c
+++ b/src/backend/catalog/storage.c
@@ -93,6 +93,10 @@ RelationCreateStorage(RelFileNode rnode, char relpersistence)
 			backend = InvalidBackendId;
 			needs_wal = false;
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			needs_wal = false;
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
 			needs_wal = true;
diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index cedb4ee..d11c5b3 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -1400,7 +1400,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap,
 	 */
 	if (newrelpersistence == RELPERSISTENCE_UNLOGGED)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_UNLOGGED;
-	else if (newrelpersistence == RELPERSISTENCE_PERMANENT)
+	else if (newrelpersistence != RELPERSISTENCE_TEMP)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_PERMANENT;
 
 	/* Report that we are now reindexing relations */
diff --git a/src/backend/commands/sequence.c b/src/backend/commands/sequence.c
index 0960b33..d700650 100644
--- a/src/backend/commands/sequence.c
+++ b/src/backend/commands/sequence.c
@@ -94,7 +94,7 @@ static HTAB *seqhashtab = NULL; /* hash table for SeqTable items */
  */
 static SeqTableData *last_used_seq = NULL;
 
-static void fill_seq_with_data(Relation rel, HeapTuple tuple);
+static void fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf);
 static Relation lock_and_open_sequence(SeqTable seq);
 static void create_seq_hashtable(void);
 static void init_sequence(Oid relid, SeqTable *p_elm, Relation *p_rel);
@@ -222,7 +222,7 @@ DefineSequence(ParseState *pstate, CreateSeqStmt *seq)
 
 	/* now initialize the sequence's data */
 	tuple = heap_form_tuple(tupDesc, value, null);
-	fill_seq_with_data(rel, tuple);
+	fill_seq_with_data(rel, tuple, InvalidBuffer);
 
 	/* process OWNED BY if given */
 	if (owned_by)
@@ -327,7 +327,7 @@ ResetSequence(Oid seq_relid)
 	/*
 	 * Insert the modified tuple into the new storage file.
 	 */
-	fill_seq_with_data(seq_rel, tuple);
+	fill_seq_with_data(seq_rel, tuple, InvalidBuffer);
 
 	/* Clear local cache so that we don't think we have cached numbers */
 	/* Note that we do not change the currval() state */
@@ -340,18 +340,21 @@ ResetSequence(Oid seq_relid)
  * Initialize a sequence's relation with the specified tuple as content
  */
 static void
-fill_seq_with_data(Relation rel, HeapTuple tuple)
+fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf)
 {
-	Buffer		buf;
 	Page		page;
 	sequence_magic *sm;
 	OffsetNumber offnum;
+	bool lockBuffer = false;
 
 	/* Initialize first page of relation with special magic number */
 
-	buf = ReadBuffer(rel, P_NEW);
-	Assert(BufferGetBlockNumber(buf) == 0);
-
+	if (buf == InvalidBuffer)
+	{
+		buf = ReadBuffer(rel, P_NEW);
+		Assert(BufferGetBlockNumber(buf) == 0);
+		lockBuffer = true;
+	}
 	page = BufferGetPage(buf);
 
 	PageInit(page, BufferGetPageSize(buf), sizeof(sequence_magic));
@@ -360,7 +363,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	/* Now insert sequence tuple */
 
-	LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
+	if (lockBuffer)
+		LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
 
 	/*
 	 * Since VACUUM does not process sequences, we have to force the tuple to
@@ -410,7 +414,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	END_CRIT_SECTION();
 
-	UnlockReleaseBuffer(buf);
+	if (lockBuffer)
+		UnlockReleaseBuffer(buf);
 }
 
 /*
@@ -502,7 +507,7 @@ AlterSequence(ParseState *pstate, AlterSeqStmt *stmt)
 		/*
 		 * Insert the modified tuple into the new storage file.
 		 */
-		fill_seq_with_data(seqrel, newdatatuple);
+		fill_seq_with_data(seqrel, newdatatuple, InvalidBuffer);
 	}
 
 	/* process OWNED BY if given */
@@ -1178,6 +1183,17 @@ read_seq_tuple(Relation rel, Buffer *buf, HeapTuple seqdatatuple)
 	LockBuffer(*buf, BUFFER_LOCK_EXCLUSIVE);
 
 	page = BufferGetPage(*buf);
+	if (rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION && PageIsNew(page))
+	{
+		/* Initialize sequence for global temporary tables */
+		Datum		value[SEQ_COL_LASTCOL] = {0};
+		bool		null[SEQ_COL_LASTCOL] = {false};
+		HeapTuple tuple;
+		value[SEQ_COL_LASTVAL-1] = Int64GetDatumFast(1); /* start sequence with 1 */
+		tuple = heap_form_tuple(RelationGetDescr(rel), value, null);
+		fill_seq_with_data(rel, tuple, *buf);
+	}
+
 	sm = (sequence_magic *) PageGetSpecialPointer(page);
 
 	if (sm->magic != SEQ_MAGIC)
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index fb2be10..a7d0e99 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -586,7 +586,8 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 	 * Check consistency of arguments
 	 */
 	if (stmt->oncommit != ONCOMMIT_NOOP
-		&& stmt->relation->relpersistence != RELPERSISTENCE_TEMP)
+		&& stmt->relation->relpersistence != RELPERSISTENCE_TEMP
+		&& stmt->relation->relpersistence != RELPERSISTENCE_SESSION)
 		ereport(ERROR,
 				(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 				 errmsg("ON COMMIT can only be used on temporary tables")));
@@ -1772,7 +1773,8 @@ ExecuteTruncateGuts(List *explicit_rels, List *relids, List *relids_logged,
 		 * table or the current physical file to be thrown away anyway.
 		 */
 		if (rel->rd_createSubid == mySubid ||
-			rel->rd_newRelfilenodeSubid == mySubid)
+			rel->rd_newRelfilenodeSubid == mySubid ||
+			rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
 		{
 			/* Immediate, non-rollbackable truncation is OK */
 			heap_truncate_one_rel(rel);
@@ -7678,6 +7680,12 @@ ATAddForeignKeyConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
 						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 						 errmsg("constraints on unlogged tables may reference only permanent or unlogged tables")));
 			break;
+		case RELPERSISTENCE_SESSION:
+			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
+				ereport(ERROR,
+						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+						 errmsg("constraints on session tables may reference only session tables")));
+			break;
 		case RELPERSISTENCE_TEMP:
 			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_TEMP)
 				ereport(ERROR,
@@ -14082,6 +14090,13 @@ ATPrepChangePersistence(Relation rel, bool toLogged)
 							RelationGetRelationName(rel)),
 					 errtable(rel)));
 			break;
+		case RELPERSISTENCE_SESSION:
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+					 errmsg("cannot change logged status of session table \"%s\"",
+							RelationGetRelationName(rel)),
+					 errtable(rel)));
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			if (toLogged)
 				/* nothing to do */
@@ -14569,14 +14584,7 @@ PreCommit_on_commit_actions(void)
 				/* Do nothing (there shouldn't be such entries, actually) */
 				break;
 			case ONCOMMIT_DELETE_ROWS:
-
-				/*
-				 * If this transaction hasn't accessed any temporary
-				 * relations, we can skip truncating ON COMMIT DELETE ROWS
-				 * tables, as they must still be empty.
-				 */
-				if ((MyXactFlags & XACT_FLAGS_ACCESSEDTEMPNAMESPACE))
-					oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
+				oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
 				break;
 			case ONCOMMIT_DROP:
 				oids_to_drop = lappend_oid(oids_to_drop, oc->relid);
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index c97bb36..f9b2000 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -3265,20 +3265,11 @@ OptTemp:	TEMPORARY					{ $$ = RELPERSISTENCE_TEMP; }
 			| TEMP						{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMPORARY			{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMP				{ $$ = RELPERSISTENCE_TEMP; }
-			| GLOBAL TEMPORARY
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
-			| GLOBAL TEMP
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
+			| GLOBAL TEMPORARY          { $$ = RELPERSISTENCE_SESSION; }
+			| GLOBAL TEMP               { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION                   { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMPORARY         { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMP              { $$ = RELPERSISTENCE_SESSION; }
 			| UNLOGGED					{ $$ = RELPERSISTENCE_UNLOGGED; }
 			| /*EMPTY*/					{ $$ = RELPERSISTENCE_PERMANENT; }
 		;
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index 6e5768c..ea6989b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -437,6 +437,14 @@ generateSerialExtraStmts(CreateStmtContext *cxt, ColumnDef *column,
 	seqstmt->options = seqoptions;
 
 	/*
+	 * Why we should not always use persistence of parent table?
+	 * Although it is prohibited to have unlogged sequences,
+	 * unlogged tables with SERIAL fields are accepted!
+	 */
+	if (cxt->relation->relpersistence != RELPERSISTENCE_UNLOGGED)
+		seqstmt->sequence->relpersistence = cxt->relation->relpersistence;
+
+	/*
 	 * If a sequence data type was specified, add it to the options.  Prepend
 	 * to the list rather than append; in case a user supplied their own AS
 	 * clause, the "redundant options" error will point to their occurrence,
diff --git a/src/backend/postmaster/autovacuum.c b/src/backend/postmaster/autovacuum.c
index 073f313..ae8b7fd 100644
--- a/src/backend/postmaster/autovacuum.c
+++ b/src/backend/postmaster/autovacuum.c
@@ -2069,7 +2069,8 @@ do_autovacuum(void)
 		 * Check if it is a temp table (presumably, of some other backend's).
 		 * We cannot safely process other backends' temp tables.
 		 */
-		if (classForm->relpersistence == RELPERSISTENCE_TEMP)
+		if (classForm->relpersistence == RELPERSISTENCE_TEMP ||
+			classForm->relpersistence == RELPERSISTENCE_SESSION)
 		{
 			/*
 			 * We just ignore it if the owning backend is still active and
@@ -2154,7 +2155,8 @@ do_autovacuum(void)
 		/*
 		 * We cannot safely process other backends' temp tables, so skip 'em.
 		 */
-		if (classForm->relpersistence == RELPERSISTENCE_TEMP)
+		if (classForm->relpersistence == RELPERSISTENCE_TEMP ||
+			classForm->relpersistence == RELPERSISTENCE_SESSION)
 			continue;
 
 		relid = classForm->oid;
diff --git a/src/backend/storage/smgr/md.c b/src/backend/storage/smgr/md.c
index 07f3c93..5db79ec 100644
--- a/src/backend/storage/smgr/md.c
+++ b/src/backend/storage/smgr/md.c
@@ -33,6 +33,7 @@
 #include "postmaster/bgwriter.h"
 #include "storage/fd.h"
 #include "storage/bufmgr.h"
+#include "storage/ipc.h"
 #include "storage/md.h"
 #include "storage/relfilenode.h"
 #include "storage/smgr.h"
@@ -87,6 +88,18 @@ typedef struct _MdfdVec
 
 static MemoryContext MdCxt;		/* context for all MdfdVec objects */
 
+/*
+ * Structure used to collect information created by this backend.
+ * Data of this related should be deleted on backend exit.
+ */
+typedef struct SessionRelation
+{
+	RelFileNodeBackend rnode;
+	struct SessionRelation* next;
+} SessionRelation;
+
+
+static SessionRelation* SessionRelations;
 
 /* Populate a file tag describing an md.c segment file. */
 #define INIT_MD_FILETAG(a,xx_rnode,xx_forknum,xx_segno) \
@@ -152,6 +165,45 @@ mdinit(void)
 								  ALLOCSET_DEFAULT_SIZES);
 }
 
+
+/*
+ * Delete all data of session relations and remove their pages from shared buffers.
+ * This function is called on backend exit.
+ */
+static void
+TruncateSessionRelations(int code, Datum arg)
+{
+	SessionRelation* rel;
+	for (rel = SessionRelations; rel != NULL; rel = rel->next)
+	{
+		/* Delete relation files */
+		mdunlink(rel->rnode, InvalidForkNumber, false);
+	}
+}
+
+/*
+ * Maintain information about session relations accessed by this backend.
+ * This list is needed to perform cleanup on backend exit.
+ * Session relation is linked in this list when this relation is created or opened and file doesn't exist.
+ * Such procedure guarantee that each relation is linked into list only once.
+ */
+static void
+RegisterSessionRelation(SMgrRelation reln)
+{
+	SessionRelation* rel = (SessionRelation*)MemoryContextAlloc(TopMemoryContext, sizeof(SessionRelation));
+
+	/*
+	 * Perform session relation cleanup on backend exit. We are using shared memory hook, because
+	 * cleanup should be performed before backend is disconnected from shared memory.
+	 */
+	if (SessionRelations == NULL)
+		on_shmem_exit(TruncateSessionRelations, 0);
+
+	rel->rnode = reln->smgr_rnode;
+	rel->next = SessionRelations;
+	SessionRelations = rel;
+}
+
 /*
  *	mdexists() -- Does the physical file exist?
  *
@@ -218,6 +270,8 @@ mdcreate(SMgrRelation reln, ForkNumber forkNum, bool isRedo)
 					 errmsg("could not create file \"%s\": %m", path)));
 		}
 	}
+	if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		RegisterSessionRelation(reln);
 
 	pfree(path);
 
@@ -465,6 +519,19 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 
 	if (fd < 0)
 	{
+		/*
+		 * In case of session relation access, there may be no yet files of this relation for this backend.
+		 * If so, then create file and register session relation for truncation on backend exit.
+		 */
+		if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
+			fd = PathNameOpenFile(path, O_RDWR | PG_BINARY | O_CREAT);
+			if (fd >= 0)
+			{
+				RegisterSessionRelation(reln);
+				goto NewSegment;
+			}
+		}
 		if ((behavior & EXTENSION_RETURN_NULL) &&
 			FILE_POSSIBLY_DELETED(errno))
 		{
@@ -476,6 +543,7 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 				 errmsg("could not open file \"%s\": %m", path)));
 	}
 
+  NewSegment:
 	pfree(path);
 
 	_fdvec_resize(reln, forknum, 1);
@@ -652,8 +720,13 @@ mdread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
 		 * complaining.  This allows, for example, the case of trying to
 		 * update a block that was later truncated away.
 		 */
-		if (zero_damaged_pages || InRecovery)
+		if (zero_damaged_pages || InRecovery || RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
 			MemSet(buffer, 0, BLCKSZ);
+			/* In case of session relation we need to write zero page to provide correct result of subsequent mdnblocks */
+			if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+				mdwrite(reln, forknum, blocknum, buffer, true);
+		}
 		else
 			ereport(ERROR,
 					(errcode(ERRCODE_DATA_CORRUPTED),
@@ -738,12 +811,18 @@ mdwrite(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
 BlockNumber
 mdnblocks(SMgrRelation reln, ForkNumber forknum)
 {
-	MdfdVec    *v = mdopenfork(reln, forknum, EXTENSION_FAIL);
+	/*
+	 * If we access session relation, there may be no files yet of this relation for this backend.
+	 * Pass EXTENSION_RETURN_NULL to make mdopen return NULL in this case instead of reporting error.
+	 */
+	MdfdVec    *v = mdopenfork(reln, forknum, RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode)
+							   ? EXTENSION_RETURN_NULL : EXTENSION_FAIL);
 	BlockNumber nblocks;
 	BlockNumber segno = 0;
 
 	/* mdopen has opened the first segment */
-	Assert(reln->md_num_open_segs[forknum] > 0);
+	if (reln->md_num_open_segs[forknum] == 0)
+		return 0;
 
 	/*
 	 * Start from the last open segments, to avoid redundant seeks.  We have
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index a87e721..2401361 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -994,6 +994,9 @@ pg_relation_filepath(PG_FUNCTION_ARGS)
 	/* Determine owning backend. */
 	switch (relform->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c
index 2488607..86e8fca 100644
--- a/src/backend/utils/cache/relcache.c
+++ b/src/backend/utils/cache/relcache.c
@@ -1098,6 +1098,10 @@ RelationBuildDesc(Oid targetRelId, bool insertIt)
 	relation->rd_newRelfilenodeSubid = InvalidSubTransactionId;
 	switch (relation->rd_rel->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			relation->rd_backend = BackendIdForSessionRelations();
+			relation->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			relation->rd_backend = InvalidBackendId;
@@ -3301,6 +3305,10 @@ RelationBuildLocalRelation(const char *relname,
 	rel->rd_rel->relpersistence = relpersistence;
 	switch (relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			rel->rd_backend = BackendIdForSessionRelations();
+			rel->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			rel->rd_backend = InvalidBackendId;
diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
index 0cc9ede..1dff0c8 100644
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -15593,8 +15593,8 @@ dumpTableSchema(Archive *fout, TableInfo *tbinfo)
 											 tbinfo->dobj.catId.oid, false);
 
 		appendPQExpBuffer(q, "CREATE %s%s %s",
-						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ?
-						  "UNLOGGED " : "",
+						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ? "UNLOGGED "
+						  : tbinfo->relpersistence == RELPERSISTENCE_SESSION ? "SESSION " : "",
 						  reltypename,
 						  qualrelname);
 
diff --git a/src/common/relpath.c b/src/common/relpath.c
index 62b9553..cef99d2 100644
--- a/src/common/relpath.c
+++ b/src/common/relpath.c
@@ -166,7 +166,18 @@ GetRelationPath(Oid dbNode, Oid spcNode, Oid relNode,
 		}
 		else
 		{
-			if (forkNumber != MAIN_FORKNUM)
+			/*
+			 * Session relations are distinguished from local temp relations by adding
+			 * SessionRelFirstBackendId offset to backendId.
+			 * These is no need to separate them at file system level, so just subtract SessionRelFirstBackendId
+			 * to avoid too long file names.
+			 * Segments of session relations have the same prefix (t%d_) as local temporary relations
+			 * to make it possible to cleanup them in the same way as local temporary relation files.
+			 */
+			 if (backendId >= SessionRelFirstBackendId)
+				 backendId -= SessionRelFirstBackendId;
+
+			 if (forkNumber != MAIN_FORKNUM)
 				path = psprintf("base/%u/t%d_%u_%s",
 								dbNode, backendId, relNode,
 								forkNames[forkNumber]);
diff --git a/src/include/catalog/pg_class.h b/src/include/catalog/pg_class.h
index 090b6ba..6a39663 100644
--- a/src/include/catalog/pg_class.h
+++ b/src/include/catalog/pg_class.h
@@ -165,6 +165,7 @@ typedef FormData_pg_class *Form_pg_class;
 #define		  RELPERSISTENCE_PERMANENT	'p' /* regular table */
 #define		  RELPERSISTENCE_UNLOGGED	'u' /* unlogged permanent table */
 #define		  RELPERSISTENCE_TEMP		't' /* temporary table */
+#define		  RELPERSISTENCE_SESSION	's' /* session table */
 
 /* default selection for replica identity (primary key or nothing) */
 #define		  REPLICA_IDENTITY_DEFAULT	'd'
diff --git a/src/include/storage/backendid.h b/src/include/storage/backendid.h
index 70ef8eb..f226e7c 100644
--- a/src/include/storage/backendid.h
+++ b/src/include/storage/backendid.h
@@ -22,6 +22,13 @@ typedef int BackendId;			/* unique currently active backend identifier */
 
 #define InvalidBackendId		(-1)
 
+/*
+ * We need to distinguish local and global temporary relations by RelFileNodeBackend.
+ * The least invasive change is to add some special bias value to backend id (since 
+ * maximal number of backed is limited by MaxBackends).
+ */
+#define SessionRelFirstBackendId (0x40000000)
+
 extern PGDLLIMPORT BackendId MyBackendId;	/* backend id of this backend */
 
 /* backend id of our parallel session leader, or InvalidBackendId if none */
@@ -34,4 +41,10 @@ extern PGDLLIMPORT BackendId ParallelMasterBackendId;
 #define BackendIdForTempRelations() \
 	(ParallelMasterBackendId == InvalidBackendId ? MyBackendId : ParallelMasterBackendId)
 
+
+#define BackendIdForSessionRelations() \
+	(BackendIdForTempRelations() + SessionRelFirstBackendId)
+
+#define IsSessionRelationBackendId(id) ((id) >= SessionRelFirstBackendId)
+
 #endif							/* BACKENDID_H */
diff --git a/src/include/storage/relfilenode.h b/src/include/storage/relfilenode.h
index 586500a..20aec72 100644
--- a/src/include/storage/relfilenode.h
+++ b/src/include/storage/relfilenode.h
@@ -75,10 +75,25 @@ typedef struct RelFileNodeBackend
 	BackendId	backend;
 } RelFileNodeBackend;
 
+/*
+ * Check whether it is local or global temporary relation, which data belongs only to one backend.
+ */
 #define RelFileNodeBackendIsTemp(rnode) \
 	((rnode).backend != InvalidBackendId)
 
 /*
+ * Check whether it is global temporary relation which metadata is shared by all sessions,
+ * but data is private for the current session.
+ */
+#define RelFileNodeBackendIsGlobalTemp(rnode) IsSessionRelationBackendId((rnode).backend)
+
+/*
+ * Check whether it is local temporary relation which exists only in this backend.
+ */
+#define RelFileNodeBackendIsLocalTemp(rnode) \
+	(RelFileNodeBackendIsTemp(rnode) && !RelFileNodeBackendIsGlobalTemp(rnode))
+
+/*
  * Note: RelFileNodeEquals and RelFileNodeBackendEquals compare relNode first
  * since that is most likely to be different in two unequal RelFileNodes.  It
  * is probably redundant to compare spcNode if the other fields are found equal,
diff --git a/src/test/isolation/expected/inherit-global-temp.out b/src/test/isolation/expected/inherit-global-temp.out
new file mode 100644
index 0000000..6114f8c
--- /dev/null
+++ b/src/test/isolation/expected/inherit-global-temp.out
@@ -0,0 +1,218 @@
+Parsed test spec with 2 sessions
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_update_p s1_update_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_update_p: UPDATE inh_global_parent SET a = 11 WHERE a = 1;
+step s1_update_c: UPDATE inh_global_parent SET a = 13 WHERE a IN (3, 5);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+2              
+11             
+4              
+13             
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+4              
+13             
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+2              
+11             
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_update_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_update_c: UPDATE inh_global_parent SET a = 15 WHERE a IN (3, 5);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+6              
+15             
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+6              
+15             
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_delete_p s1_delete_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_delete_p: DELETE FROM inh_global_parent WHERE a = 2;
+step s1_delete_c: DELETE FROM inh_global_parent WHERE a IN (4, 6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+3              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_delete_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_delete_c: DELETE FROM inh_global_parent WHERE a IN (4, 6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+5              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_truncate_p s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_truncate_p s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_truncate_p: TRUNCATE inh_global_parent;
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_begin s1_truncate_p s2_select_p s1_commit
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_begin: BEGIN;
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s2_select_p: SELECT a FROM inh_global_parent; <waiting ...>
+step s1_commit: COMMIT;
+step s2_select_p: <... completed>
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_begin s1_truncate_p s2_select_c s1_commit
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_begin: BEGIN;
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2; <waiting ...>
+step s1_commit: COMMIT;
+step s2_select_c: <... completed>
+a              
+
+5              
+6              
diff --git a/src/test/isolation/isolation_schedule b/src/test/isolation/isolation_schedule
index 69ae227..95919f8 100644
--- a/src/test/isolation/isolation_schedule
+++ b/src/test/isolation/isolation_schedule
@@ -87,3 +87,4 @@ test: plpgsql-toast
 test: truncate-conflict
 test: serializable-parallel
 test: serializable-parallel-2
+test: inherit-global-temp
diff --git a/src/test/isolation/specs/inherit-global-temp.spec b/src/test/isolation/specs/inherit-global-temp.spec
new file mode 100644
index 0000000..5e95dd6
--- /dev/null
+++ b/src/test/isolation/specs/inherit-global-temp.spec
@@ -0,0 +1,73 @@
+# This is a copy of the inherit-temp test with little changes for global temporary tables.
+#
+
+setup
+{
+  CREATE TABLE inh_global_parent (a int);
+}
+
+teardown
+{
+  DROP TABLE inh_global_parent;
+}
+
+# Session 1 executes actions which act directly on both the parent and
+# its child.  Abbreviation "c" is used for queries working on the child
+# and "p" on the parent.
+session "s1"
+setup
+{
+  CREATE GLOBAL TEMPORARY TABLE inh_global_temp_child_s1 () INHERITS (inh_global_parent);
+}
+step "s1_begin" { BEGIN; }
+step "s1_truncate_p" { TRUNCATE inh_global_parent; }
+step "s1_select_p" { SELECT a FROM inh_global_parent; }
+step "s1_select_c" { SELECT a FROM inh_global_temp_child_s1; }
+step "s1_insert_p" { INSERT INTO inh_global_parent VALUES (1), (2); }
+step "s1_insert_c" { INSERT INTO inh_global_temp_child_s1 VALUES (3), (4); }
+step "s1_update_p" { UPDATE inh_global_parent SET a = 11 WHERE a = 1; }
+step "s1_update_c" { UPDATE inh_global_parent SET a = 13 WHERE a IN (3, 5); }
+step "s1_delete_p" { DELETE FROM inh_global_parent WHERE a = 2; }
+step "s1_delete_c" { DELETE FROM inh_global_parent WHERE a IN (4, 6); }
+step "s1_commit" { COMMIT; }
+teardown
+{
+  DROP TABLE inh_global_temp_child_s1;
+}
+
+# Session 2 executes actions on the parent which act only on the child.
+session "s2"
+setup
+{
+  CREATE GLOBAL TEMPORARY TABLE inh_global_temp_child_s2 () INHERITS (inh_global_parent);
+}
+step "s2_truncate_p" { TRUNCATE inh_global_parent; }
+step "s2_select_p" { SELECT a FROM inh_global_parent; }
+step "s2_select_c" { SELECT a FROM inh_global_temp_child_s2; }
+step "s2_insert_c" { INSERT INTO inh_global_temp_child_s2 VALUES (5), (6); }
+step "s2_update_c" { UPDATE inh_global_parent SET a = 15 WHERE a IN (3, 5); }
+step "s2_delete_c" { DELETE FROM inh_global_parent WHERE a IN (4, 6); }
+teardown
+{
+  DROP TABLE inh_global_temp_child_s2;
+}
+
+# Check INSERT behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check UPDATE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_update_p" "s1_update_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_update_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check DELETE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_delete_p" "s1_delete_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_delete_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check TRUNCATE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_truncate_p" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_truncate_p" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# TRUNCATE on a parent tree does not block access to temporary child relation
+# of another session, and blocks when scanning the parent.
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_begin" "s1_truncate_p" "s2_select_p" "s1_commit"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_begin" "s1_truncate_p" "s2_select_c" "s1_commit"
diff --git a/src/test/regress/expected/global_temp.out b/src/test/regress/expected/global_temp.out
new file mode 100644
index 0000000..ae1adb6
--- /dev/null
+++ b/src/test/regress/expected/global_temp.out
@@ -0,0 +1,247 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+-- Test ON COMMIT DELETE ROWS
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+   2
+(2 rows)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+(1 row)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+ col 
+-----
+   1
+(1 row)
+
+SELECT * FROM global_temptest2;
+ col 
+-----
+(0 rows)
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+ERROR:  unsupported ON COMMIT and foreign key combination
+DETAIL:  Table "global_temptest4" references "global_temptest3", but they do not have the same ON COMMIT setting.
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+ a 
+---
+(0 rows)
+
+DROP TABLE temp_parted_oncommit;
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+              relname              
+-----------------------------------
+ global_temp_parted_oncommit_test
+ global_temp_parted_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_parted_oncommit_test;
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+            relname             
+--------------------------------
+ global_temp_inh_oncommit_test
+ global_temp_inh_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ERROR:  cannot inherit from temporary relation "global_temp_table"
+ROLLBACK;
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM global_temp_table;
+ a 
+---
+ 1
+(1 row)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+(2 rows)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       1
+(1 row)
+
+\c
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+(0 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       2
+(1 row)
+
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       3
+(1 row)
+
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
diff --git a/src/test/regress/expected/session_table.out b/src/test/regress/expected/session_table.out
new file mode 100644
index 0000000..1b9b3f4
--- /dev/null
+++ b/src/test/regress/expected/session_table.out
@@ -0,0 +1,64 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+ count 
+-------
+ 10000
+(1 row)
+
+\c
+select count(*) from my_private_table;
+ count 
+-------
+     0
+(1 row)
+
+select * from my_private_table where x=10001;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select * from my_private_table where y=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select count(*) from my_private_table;
+ count  
+--------
+ 100000
+(1 row)
+
+\c
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+   x    |   y    
+--------+--------
+ 100000 | 100000
+(1 row)
+
+drop table  my_private_table;
diff --git a/src/test/regress/parallel_schedule b/src/test/regress/parallel_schedule
index fc0f141..507cf7d 100644
--- a/src/test/regress/parallel_schedule
+++ b/src/test/regress/parallel_schedule
@@ -107,7 +107,7 @@ test: json jsonb json_encoding jsonpath jsonpath_encoding jsonb_jsonpath
 # NB: temp.sql does a reconnect which transiently uses 2 connections,
 # so keep this parallel group to at most 19 tests
 # ----------
-test: plancache limit plpgsql copy2 temp domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
+test: plancache limit plpgsql copy2 temp global_temp session_table domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
 
 # ----------
 # Another group of parallel tests
diff --git a/src/test/regress/serial_schedule b/src/test/regress/serial_schedule
index 68ac56a..3890777 100644
--- a/src/test/regress/serial_schedule
+++ b/src/test/regress/serial_schedule
@@ -172,6 +172,8 @@ test: limit
 test: plpgsql
 test: copy2
 test: temp
+test: global_temp
+test: session_table
 test: domain
 test: rangefuncs
 test: prepare
diff --git a/src/test/regress/sql/global_temp.sql b/src/test/regress/sql/global_temp.sql
new file mode 100644
index 0000000..3058b9b
--- /dev/null
+++ b/src/test/regress/sql/global_temp.sql
@@ -0,0 +1,151 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+
+-- Test ON COMMIT DELETE ROWS
+
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+SELECT * FROM global_temptest2;
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+DROP TABLE temp_parted_oncommit;
+
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+DROP TABLE global_temp_parted_oncommit_test;
+
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ROLLBACK;
+
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+COMMIT;
+SELECT * FROM global_temp_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+COMMIT;
+SELECT * FROM normal_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+\c
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
diff --git a/src/test/regress/sql/session_table.sql b/src/test/regress/sql/session_table.sql
new file mode 100644
index 0000000..c6663dc
--- /dev/null
+++ b/src/test/regress/sql/session_table.sql
@@ -0,0 +1,18 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+\c
+select count(*) from my_private_table;
+select * from my_private_table where x=10001;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+select * from my_private_table where y=10001;
+select count(*) from my_private_table;
+\c
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+drop table  my_private_table;

diff --git a/contrib/pg_buffercache/pg_buffercache_pages.c b/contrib/pg_buffercache/pg_buffercache_pages.c
index 1bd579f..2d93f6f 100644
--- a/contrib/pg_buffercache/pg_buffercache_pages.c
+++ b/contrib/pg_buffercache/pg_buffercache_pages.c
@@ -153,9 +153,9 @@ pg_buffercache_pages(PG_FUNCTION_ARGS)
 			buf_state = LockBufHdr(bufHdr);
 
 			fctx->record[i].bufferid = BufferDescriptorGetBuffer(bufHdr);
-			fctx->record[i].relfilenode = bufHdr->tag.rnode.relNode;
-			fctx->record[i].reltablespace = bufHdr->tag.rnode.spcNode;
-			fctx->record[i].reldatabase = bufHdr->tag.rnode.dbNode;
+			fctx->record[i].relfilenode = bufHdr->tag.rnode.node.relNode;
+			fctx->record[i].reltablespace = bufHdr->tag.rnode.node.spcNode;
+			fctx->record[i].reldatabase = bufHdr->tag.rnode.node.dbNode;
 			fctx->record[i].forknum = bufHdr->tag.forkNum;
 			fctx->record[i].blocknum = bufHdr->tag.blockNum;
 			fctx->record[i].usagecount = BUF_STATE_GET_USAGECOUNT(buf_state);
diff --git a/contrib/pg_prewarm/autoprewarm.c b/contrib/pg_prewarm/autoprewarm.c
index 38ae240..8a04954 100644
--- a/contrib/pg_prewarm/autoprewarm.c
+++ b/contrib/pg_prewarm/autoprewarm.c
@@ -608,9 +608,9 @@ apw_dump_now(bool is_bgworker, bool dump_unlogged)
 		if (buf_state & BM_TAG_VALID &&
 			((buf_state & BM_PERMANENT) || dump_unlogged))
 		{
-			block_info_array[num_blocks].database = bufHdr->tag.rnode.dbNode;
-			block_info_array[num_blocks].tablespace = bufHdr->tag.rnode.spcNode;
-			block_info_array[num_blocks].filenode = bufHdr->tag.rnode.relNode;
+			block_info_array[num_blocks].database = bufHdr->tag.rnode.node.dbNode;
+			block_info_array[num_blocks].tablespace = bufHdr->tag.rnode.node.spcNode;
+			block_info_array[num_blocks].filenode = bufHdr->tag.rnode.node.relNode;
 			block_info_array[num_blocks].forknum = bufHdr->tag.forkNum;
 			block_info_array[num_blocks].blocknum = bufHdr->tag.blockNum;
 			++num_blocks;
diff --git a/src/backend/access/gin/ginxlog.c b/src/backend/access/gin/ginxlog.c
index c945b28..14d4e48 100644
--- a/src/backend/access/gin/ginxlog.c
+++ b/src/backend/access/gin/ginxlog.c
@@ -95,13 +95,13 @@ ginRedoInsertEntry(Buffer buffer, bool isLeaf, BlockNumber rightblkno, void *rda
 
 	if (PageAddItem(page, (Item) itup, IndexTupleSize(itup), offset, false, false) == InvalidOffsetNumber)
 	{
-		RelFileNode node;
+		RelFileNodeBackend rnode;
 		ForkNumber	forknum;
 		BlockNumber blknum;
 
-		BufferGetTag(buffer, &node, &forknum, &blknum);
+		BufferGetTag(buffer, &rnode, &forknum, &blknum);
 		elog(ERROR, "failed to add item to index page in %u/%u/%u",
-			 node.spcNode, node.dbNode, node.relNode);
+			 rnode.node.spcNode, rnode.node.dbNode, rnode.node.relNode);
 	}
 }
 
diff --git a/src/backend/access/gist/gistutil.c b/src/backend/access/gist/gistutil.c
index 9726020..c99701d 100644
--- a/src/backend/access/gist/gistutil.c
+++ b/src/backend/access/gist/gistutil.c
@@ -1028,7 +1028,7 @@ gistGetFakeLSN(Relation rel)
 {
 	static XLogRecPtr counter = FirstNormalUnloggedLSN;
 
-	if (rel->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
+	if (RelationHasSessionScope(rel))
 	{
 		/*
 		 * Temporary relations are only accessible in our session, so a simple
diff --git a/src/backend/access/heap/heapam_handler.c b/src/backend/access/heap/heapam_handler.c
index 09bc6fe..c60effd 100644
--- a/src/backend/access/heap/heapam_handler.c
+++ b/src/backend/access/heap/heapam_handler.c
@@ -671,6 +671,7 @@ heapam_relation_copy_data(Relation rel, const RelFileNode *newrnode)
 			 * init fork of an unlogged relation.
 			 */
 			if (rel->rd_rel->relpersistence == RELPERSISTENCE_PERMANENT ||
+				rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ||
 				(rel->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED &&
 				 forkNum == INIT_FORKNUM))
 				log_smgrcreate(newrnode, forkNum);
diff --git a/src/backend/access/nbtree/nbtpage.c b/src/backend/access/nbtree/nbtpage.c
index 5962126..bdb6c95 100644
--- a/src/backend/access/nbtree/nbtpage.c
+++ b/src/backend/access/nbtree/nbtpage.c
@@ -763,7 +763,11 @@ _bt_getbuf(Relation rel, BlockNumber blkno, int access)
 		/* Read an existing block of the relation */
 		buf = ReadBuffer(rel, blkno);
 		LockBuffer(buf, access);
-		_bt_checkpage(rel, buf);
+		/* Session temporary relation may be not yet initialized for this backend. */
+		if (blkno == BTREE_METAPAGE && GlobalTempRelationPageIsNotInitialized(rel, BufferGetPage(buf)))
+			_bt_initmetapage(BufferGetPage(buf), P_NONE, 0);
+		else
+			_bt_checkpage(rel, buf);
 	}
 	else
 	{
diff --git a/src/backend/access/transam/xloginsert.c b/src/backend/access/transam/xloginsert.c
index 3ec67d4..edec8ca 100644
--- a/src/backend/access/transam/xloginsert.c
+++ b/src/backend/access/transam/xloginsert.c
@@ -213,6 +213,7 @@ void
 XLogRegisterBuffer(uint8 block_id, Buffer buffer, uint8 flags)
 {
 	registered_buffer *regbuf;
+	RelFileNodeBackend rnode;
 
 	/* NO_IMAGE doesn't make sense with FORCE_IMAGE */
 	Assert(!((flags & REGBUF_FORCE_IMAGE) && (flags & (REGBUF_NO_IMAGE))));
@@ -227,7 +228,8 @@ XLogRegisterBuffer(uint8 block_id, Buffer buffer, uint8 flags)
 
 	regbuf = &registered_buffers[block_id];
 
-	BufferGetTag(buffer, &regbuf->rnode, &regbuf->forkno, &regbuf->block);
+	BufferGetTag(buffer, &rnode, &regbuf->forkno, &regbuf->block);
+	regbuf->rnode = rnode.node;
 	regbuf->page = BufferGetPage(buffer);
 	regbuf->flags = flags;
 	regbuf->rdata_tail = (XLogRecData *) &regbuf->rdata_head;
@@ -919,7 +921,7 @@ XLogSaveBufferForHint(Buffer buffer, bool buffer_std)
 		int			flags;
 		PGAlignedBlock copied_buffer;
 		char	   *origdata = (char *) BufferGetBlock(buffer);
-		RelFileNode rnode;
+		RelFileNodeBackend rnode;
 		ForkNumber	forkno;
 		BlockNumber blkno;
 
@@ -948,7 +950,7 @@ XLogSaveBufferForHint(Buffer buffer, bool buffer_std)
 			flags |= REGBUF_STANDARD;
 
 		BufferGetTag(buffer, &rnode, &forkno, &blkno);
-		XLogRegisterBlock(0, &rnode, forkno, blkno, copied_buffer.data, flags);
+		XLogRegisterBlock(0, &rnode.node, forkno, blkno, copied_buffer.data, flags);
 
 		recptr = XLogInsert(RM_XLOG_ID, XLOG_FPI_FOR_HINT);
 	}
@@ -1009,7 +1011,7 @@ XLogRecPtr
 log_newpage_buffer(Buffer buffer, bool page_std)
 {
 	Page		page = BufferGetPage(buffer);
-	RelFileNode rnode;
+	RelFileNodeBackend rnode;
 	ForkNumber	forkNum;
 	BlockNumber blkno;
 
@@ -1018,7 +1020,7 @@ log_newpage_buffer(Buffer buffer, bool page_std)
 
 	BufferGetTag(buffer, &rnode, &forkNum, &blkno);
 
-	return log_newpage(&rnode, forkNum, blkno, page, page_std);
+	return log_newpage(&rnode.node, forkNum, blkno, page, page_std);
 }
 
 /*
diff --git a/src/backend/catalog/catalog.c b/src/backend/catalog/catalog.c
index a065419..8814afb 100644
--- a/src/backend/catalog/catalog.c
+++ b/src/backend/catalog/catalog.c
@@ -409,6 +409,9 @@ GetNewRelFileNode(Oid reltablespace, Relation pg_class, char relpersistence)
 		case RELPERSISTENCE_TEMP:
 			backend = BackendIdForTempRelations();
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 99ae159..24b2438 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3612,7 +3612,7 @@ reindex_relation(Oid relid, int flags, int options)
 		if (flags & REINDEX_REL_FORCE_INDEXES_UNLOGGED)
 			persistence = RELPERSISTENCE_UNLOGGED;
 		else if (flags & REINDEX_REL_FORCE_INDEXES_PERMANENT)
-			persistence = RELPERSISTENCE_PERMANENT;
+			persistence = rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ? RELPERSISTENCE_SESSION : RELPERSISTENCE_PERMANENT;
 		else
 			persistence = rel->rd_rel->relpersistence;
 
diff --git a/src/backend/catalog/storage.c b/src/backend/catalog/storage.c
index 3cc886f..a111ddc 100644
--- a/src/backend/catalog/storage.c
+++ b/src/backend/catalog/storage.c
@@ -93,6 +93,10 @@ RelationCreateStorage(RelFileNode rnode, char relpersistence)
 			backend = InvalidBackendId;
 			needs_wal = false;
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			needs_wal = false;
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
 			needs_wal = true;
diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index cedb4ee..d11c5b3 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -1400,7 +1400,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap,
 	 */
 	if (newrelpersistence == RELPERSISTENCE_UNLOGGED)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_UNLOGGED;
-	else if (newrelpersistence == RELPERSISTENCE_PERMANENT)
+	else if (newrelpersistence != RELPERSISTENCE_TEMP)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_PERMANENT;
 
 	/* Report that we are now reindexing relations */
diff --git a/src/backend/commands/sequence.c b/src/backend/commands/sequence.c
index 0960b33..6c3998f 100644
--- a/src/backend/commands/sequence.c
+++ b/src/backend/commands/sequence.c
@@ -94,7 +94,7 @@ static HTAB *seqhashtab = NULL; /* hash table for SeqTable items */
  */
 static SeqTableData *last_used_seq = NULL;
 
-static void fill_seq_with_data(Relation rel, HeapTuple tuple);
+static void fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf);
 static Relation lock_and_open_sequence(SeqTable seq);
 static void create_seq_hashtable(void);
 static void init_sequence(Oid relid, SeqTable *p_elm, Relation *p_rel);
@@ -222,7 +222,7 @@ DefineSequence(ParseState *pstate, CreateSeqStmt *seq)
 
 	/* now initialize the sequence's data */
 	tuple = heap_form_tuple(tupDesc, value, null);
-	fill_seq_with_data(rel, tuple);
+	fill_seq_with_data(rel, tuple, InvalidBuffer);
 
 	/* process OWNED BY if given */
 	if (owned_by)
@@ -327,7 +327,7 @@ ResetSequence(Oid seq_relid)
 	/*
 	 * Insert the modified tuple into the new storage file.
 	 */
-	fill_seq_with_data(seq_rel, tuple);
+	fill_seq_with_data(seq_rel, tuple, InvalidBuffer);
 
 	/* Clear local cache so that we don't think we have cached numbers */
 	/* Note that we do not change the currval() state */
@@ -340,18 +340,21 @@ ResetSequence(Oid seq_relid)
  * Initialize a sequence's relation with the specified tuple as content
  */
 static void
-fill_seq_with_data(Relation rel, HeapTuple tuple)
+fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf)
 {
-	Buffer		buf;
 	Page		page;
 	sequence_magic *sm;
 	OffsetNumber offnum;
+	bool lockBuffer = false;
 
 	/* Initialize first page of relation with special magic number */
 
-	buf = ReadBuffer(rel, P_NEW);
-	Assert(BufferGetBlockNumber(buf) == 0);
-
+	if (buf == InvalidBuffer)
+	{
+		buf = ReadBuffer(rel, P_NEW);
+		Assert(BufferGetBlockNumber(buf) == 0);
+		lockBuffer = true;
+	}
 	page = BufferGetPage(buf);
 
 	PageInit(page, BufferGetPageSize(buf), sizeof(sequence_magic));
@@ -360,7 +363,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	/* Now insert sequence tuple */
 
-	LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
+	if (lockBuffer)
+		LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
 
 	/*
 	 * Since VACUUM does not process sequences, we have to force the tuple to
@@ -410,7 +414,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	END_CRIT_SECTION();
 
-	UnlockReleaseBuffer(buf);
+	if (lockBuffer)
+		UnlockReleaseBuffer(buf);
 }
 
 /*
@@ -502,7 +507,7 @@ AlterSequence(ParseState *pstate, AlterSeqStmt *stmt)
 		/*
 		 * Insert the modified tuple into the new storage file.
 		 */
-		fill_seq_with_data(seqrel, newdatatuple);
+		fill_seq_with_data(seqrel, newdatatuple, InvalidBuffer);
 	}
 
 	/* process OWNED BY if given */
@@ -1178,6 +1183,17 @@ read_seq_tuple(Relation rel, Buffer *buf, HeapTuple seqdatatuple)
 	LockBuffer(*buf, BUFFER_LOCK_EXCLUSIVE);
 
 	page = BufferGetPage(*buf);
+	if (GlobalTempRelationPageIsNotInitialized(rel, page))
+	{
+		/* Initialize sequence for global temporary tables */
+		Datum		value[SEQ_COL_LASTCOL] = {0};
+		bool		null[SEQ_COL_LASTCOL] = {false};
+		HeapTuple tuple;
+		value[SEQ_COL_LASTVAL-1] = Int64GetDatumFast(1); /* start sequence with 1 */
+		tuple = heap_form_tuple(RelationGetDescr(rel), value, null);
+		fill_seq_with_data(rel, tuple, *buf);
+	}
+
 	sm = (sequence_magic *) PageGetSpecialPointer(page);
 
 	if (sm->magic != SEQ_MAGIC)
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index fb2be10..a31f775 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -586,7 +586,7 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 	 * Check consistency of arguments
 	 */
 	if (stmt->oncommit != ONCOMMIT_NOOP
-		&& stmt->relation->relpersistence != RELPERSISTENCE_TEMP)
+		&& !IsLocalRelpersistence(stmt->relation->relpersistence))
 		ereport(ERROR,
 				(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 				 errmsg("ON COMMIT can only be used on temporary tables")));
@@ -1772,7 +1772,8 @@ ExecuteTruncateGuts(List *explicit_rels, List *relids, List *relids_logged,
 		 * table or the current physical file to be thrown away anyway.
 		 */
 		if (rel->rd_createSubid == mySubid ||
-			rel->rd_newRelfilenodeSubid == mySubid)
+			rel->rd_newRelfilenodeSubid == mySubid ||
+			rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
 		{
 			/* Immediate, non-rollbackable truncation is OK */
 			heap_truncate_one_rel(rel);
@@ -7678,6 +7679,12 @@ ATAddForeignKeyConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
 						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 						 errmsg("constraints on unlogged tables may reference only permanent or unlogged tables")));
 			break;
+		case RELPERSISTENCE_SESSION:
+			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
+				ereport(ERROR,
+						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+						 errmsg("constraints on session tables may reference only session tables")));
+			break;
 		case RELPERSISTENCE_TEMP:
 			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_TEMP)
 				ereport(ERROR,
@@ -14082,6 +14089,13 @@ ATPrepChangePersistence(Relation rel, bool toLogged)
 							RelationGetRelationName(rel)),
 					 errtable(rel)));
 			break;
+		case RELPERSISTENCE_SESSION:
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+					 errmsg("cannot change logged status of session table \"%s\"",
+							RelationGetRelationName(rel)),
+					 errtable(rel)));
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			if (toLogged)
 				/* nothing to do */
@@ -14569,14 +14583,7 @@ PreCommit_on_commit_actions(void)
 				/* Do nothing (there shouldn't be such entries, actually) */
 				break;
 			case ONCOMMIT_DELETE_ROWS:
-
-				/*
-				 * If this transaction hasn't accessed any temporary
-				 * relations, we can skip truncating ON COMMIT DELETE ROWS
-				 * tables, as they must still be empty.
-				 */
-				if ((MyXactFlags & XACT_FLAGS_ACCESSEDTEMPNAMESPACE))
-					oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
+				oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
 				break;
 			case ONCOMMIT_DROP:
 				oids_to_drop = lappend_oid(oids_to_drop, oc->relid);
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index c97bb36..f9b2000 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -3265,20 +3265,11 @@ OptTemp:	TEMPORARY					{ $$ = RELPERSISTENCE_TEMP; }
 			| TEMP						{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMPORARY			{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMP				{ $$ = RELPERSISTENCE_TEMP; }
-			| GLOBAL TEMPORARY
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
-			| GLOBAL TEMP
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
+			| GLOBAL TEMPORARY          { $$ = RELPERSISTENCE_SESSION; }
+			| GLOBAL TEMP               { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION                   { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMPORARY         { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMP              { $$ = RELPERSISTENCE_SESSION; }
 			| UNLOGGED					{ $$ = RELPERSISTENCE_UNLOGGED; }
 			| /*EMPTY*/					{ $$ = RELPERSISTENCE_PERMANENT; }
 		;
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index a9b2f8b..2f261b9 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -437,6 +437,14 @@ generateSerialExtraStmts(CreateStmtContext *cxt, ColumnDef *column,
 	seqstmt->options = seqoptions;
 
 	/*
+	 * Why we should not always use persistence of parent table?
+	 * Although it is prohibited to have unlogged sequences,
+	 * unlogged tables with SERIAL fields are accepted!
+	 */
+	if (cxt->relation->relpersistence != RELPERSISTENCE_UNLOGGED)
+		seqstmt->sequence->relpersistence = cxt->relation->relpersistence;
+
+	/*
 	 * If a sequence data type was specified, add it to the options.  Prepend
 	 * to the list rather than append; in case a user supplied their own AS
 	 * clause, the "redundant options" error will point to their occurrence,
diff --git a/src/backend/postmaster/autovacuum.c b/src/backend/postmaster/autovacuum.c
index 073f313..3383c35 100644
--- a/src/backend/postmaster/autovacuum.c
+++ b/src/backend/postmaster/autovacuum.c
@@ -2069,7 +2069,7 @@ do_autovacuum(void)
 		 * Check if it is a temp table (presumably, of some other backend's).
 		 * We cannot safely process other backends' temp tables.
 		 */
-		if (classForm->relpersistence == RELPERSISTENCE_TEMP)
+		if (IsLocalRelpersistence(classForm->relpersistence))
 		{
 			/*
 			 * We just ignore it if the owning backend is still active and
@@ -2154,7 +2154,7 @@ do_autovacuum(void)
 		/*
 		 * We cannot safely process other backends' temp tables, so skip 'em.
 		 */
-		if (classForm->relpersistence == RELPERSISTENCE_TEMP)
+		if (IsLocalRelpersistence(classForm->relpersistence))
 			continue;
 
 		relid = classForm->oid;
diff --git a/src/backend/replication/logical/reorderbuffer.c b/src/backend/replication/logical/reorderbuffer.c
index e8ffa04..2004d2f 100644
--- a/src/backend/replication/logical/reorderbuffer.c
+++ b/src/backend/replication/logical/reorderbuffer.c
@@ -3483,6 +3483,7 @@ ResolveCminCmaxDuringDecoding(HTAB *tuplecid_data,
 {
 	ReorderBufferTupleCidKey key;
 	ReorderBufferTupleCidEnt *ent;
+	RelFileNodeBackend rnode;
 	ForkNumber	forkno;
 	BlockNumber blockno;
 	bool		updated_mapping = false;
@@ -3496,7 +3497,8 @@ ResolveCminCmaxDuringDecoding(HTAB *tuplecid_data,
 	 * get relfilenode from the buffer, no convenient way to access it other
 	 * than that.
 	 */
-	BufferGetTag(buffer, &key.relnode, &forkno, &blockno);
+	BufferGetTag(buffer, &rnode, &forkno, &blockno);
+	key.relnode = rnode.node;
 
 	/* tuples can only be in the main fork */
 	Assert(forkno == MAIN_FORKNUM);
diff --git a/src/backend/storage/buffer/bufmgr.c b/src/backend/storage/buffer/bufmgr.c
index 6f3a402..76ce953 100644
--- a/src/backend/storage/buffer/bufmgr.c
+++ b/src/backend/storage/buffer/bufmgr.c
@@ -556,7 +556,7 @@ PrefetchBuffer(Relation reln, ForkNumber forkNum, BlockNumber blockNum)
 		int			buf_id;
 
 		/* create a tag so we can lookup the buffer */
-		INIT_BUFFERTAG(newTag, reln->rd_smgr->smgr_rnode.node,
+		INIT_BUFFERTAG(newTag, reln->rd_smgr->smgr_rnode,
 					   forkNum, blockNum);
 
 		/* determine its hash code and partition lock ID */
@@ -710,7 +710,7 @@ ReadBuffer_common(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
 	Block		bufBlock;
 	bool		found;
 	bool		isExtend;
-	bool		isLocalBuf = SmgrIsTemp(smgr);
+	bool		isLocalBuf = SmgrIsTemp(smgr) && relpersistence == RELPERSISTENCE_TEMP;
 
 	*hit = false;
 
@@ -1010,7 +1010,7 @@ BufferAlloc(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
 	uint32		buf_state;
 
 	/* create a tag so we can lookup the buffer */
-	INIT_BUFFERTAG(newTag, smgr->smgr_rnode.node, forkNum, blockNum);
+	INIT_BUFFERTAG(newTag, smgr->smgr_rnode, forkNum, blockNum);
 
 	/* determine its hash code and partition lock ID */
 	newHash = BufTableHashCode(&newTag);
@@ -1532,7 +1532,8 @@ ReleaseAndReadBuffer(Buffer buffer,
 		{
 			bufHdr = GetLocalBufferDescriptor(-buffer - 1);
 			if (bufHdr->tag.blockNum == blockNum &&
-				RelFileNodeEquals(bufHdr->tag.rnode, relation->rd_node) &&
+				RelFileNodeEquals(bufHdr->tag.rnode.node, relation->rd_node) &&
+				bufHdr->tag.rnode.backend == relation->rd_backend &&
 				bufHdr->tag.forkNum == forkNum)
 				return buffer;
 			ResourceOwnerForgetBuffer(CurrentResourceOwner, buffer);
@@ -1543,7 +1544,8 @@ ReleaseAndReadBuffer(Buffer buffer,
 			bufHdr = GetBufferDescriptor(buffer - 1);
 			/* we have pin, so it's ok to examine tag without spinlock */
 			if (bufHdr->tag.blockNum == blockNum &&
-				RelFileNodeEquals(bufHdr->tag.rnode, relation->rd_node) &&
+				RelFileNodeEquals(bufHdr->tag.rnode.node, relation->rd_node) &&
+				bufHdr->tag.rnode.backend == relation->rd_backend &&
 				bufHdr->tag.forkNum == forkNum)
 				return buffer;
 			UnpinBuffer(bufHdr, true);
@@ -1845,8 +1847,8 @@ BufferSync(int flags)
 
 			item = &CkptBufferIds[num_to_scan++];
 			item->buf_id = buf_id;
-			item->tsId = bufHdr->tag.rnode.spcNode;
-			item->relNode = bufHdr->tag.rnode.relNode;
+			item->tsId = bufHdr->tag.rnode.node.spcNode;
+			item->relNode = bufHdr->tag.rnode.node.relNode;
 			item->forkNum = bufHdr->tag.forkNum;
 			item->blockNum = bufHdr->tag.blockNum;
 		}
@@ -2559,7 +2561,7 @@ PrintBufferLeakWarning(Buffer buffer)
 	}
 
 	/* theoretically we should lock the bufhdr here */
-	path = relpathbackend(buf->tag.rnode, backend, buf->tag.forkNum);
+	path = relpathbackend(buf->tag.rnode.node, backend, buf->tag.forkNum);
 	buf_state = pg_atomic_read_u32(&buf->state);
 	elog(WARNING,
 		 "buffer refcount leak: [%03d] "
@@ -2631,7 +2633,7 @@ BufferGetBlockNumber(Buffer buffer)
  *		a buffer.
  */
 void
-BufferGetTag(Buffer buffer, RelFileNode *rnode, ForkNumber *forknum,
+BufferGetTag(Buffer buffer, RelFileNodeBackend *rnode, ForkNumber *forknum,
 			 BlockNumber *blknum)
 {
 	BufferDesc *bufHdr;
@@ -2696,7 +2698,7 @@ FlushBuffer(BufferDesc *buf, SMgrRelation reln)
 
 	/* Find smgr relation for buffer */
 	if (reln == NULL)
-		reln = smgropen(buf->tag.rnode, InvalidBackendId);
+		reln = smgropen(buf->tag.rnode.node, buf->tag.rnode.backend);
 
 	TRACE_POSTGRESQL_BUFFER_FLUSH_START(buf->tag.forkNum,
 										buf->tag.blockNum,
@@ -2930,7 +2932,7 @@ DropRelFileNodeBuffers(RelFileNodeBackend rnode, ForkNumber forkNum,
 	int			i;
 
 	/* If it's a local relation, it's localbuf.c's problem. */
-	if (RelFileNodeBackendIsTemp(rnode))
+	if (RelFileNodeBackendIsLocalTemp(rnode))
 	{
 		if (rnode.backend == MyBackendId)
 			DropRelFileNodeLocalBuffers(rnode.node, forkNum, firstDelBlock);
@@ -2958,11 +2960,11 @@ DropRelFileNodeBuffers(RelFileNodeBackend rnode, ForkNumber forkNum,
 		 * We could check forkNum and blockNum as well as the rnode, but the
 		 * incremental win from doing so seems small.
 		 */
-		if (!RelFileNodeEquals(bufHdr->tag.rnode, rnode.node))
+		if (!RelFileNodeBackendEquals(bufHdr->tag.rnode, rnode))
 			continue;
 
 		buf_state = LockBufHdr(bufHdr);
-		if (RelFileNodeEquals(bufHdr->tag.rnode, rnode.node) &&
+		if (RelFileNodeBackendEquals(bufHdr->tag.rnode, rnode) &&
 			bufHdr->tag.forkNum == forkNum &&
 			bufHdr->tag.blockNum >= firstDelBlock)
 			InvalidateBuffer(bufHdr);	/* releases spinlock */
@@ -2985,24 +2987,24 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 {
 	int			i,
 				n = 0;
-	RelFileNode *nodes;
+	RelFileNodeBackend *nodes;
 	bool		use_bsearch;
 
 	if (nnodes == 0)
 		return;
 
-	nodes = palloc(sizeof(RelFileNode) * nnodes);	/* non-local relations */
+	nodes = palloc(sizeof(RelFileNodeBackend) * nnodes);	/* non-local relations */
 
 	/* If it's a local relation, it's localbuf.c's problem. */
 	for (i = 0; i < nnodes; i++)
 	{
-		if (RelFileNodeBackendIsTemp(rnodes[i]))
+		if (RelFileNodeBackendIsLocalTemp(rnodes[i]))
 		{
 			if (rnodes[i].backend == MyBackendId)
 				DropRelFileNodeAllLocalBuffers(rnodes[i].node);
 		}
 		else
-			nodes[n++] = rnodes[i].node;
+			nodes[n++] = rnodes[i];
 	}
 
 	/*
@@ -3025,11 +3027,11 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 
 	/* sort the list of rnodes if necessary */
 	if (use_bsearch)
-		pg_qsort(nodes, n, sizeof(RelFileNode), rnode_comparator);
+		pg_qsort(nodes, n, sizeof(RelFileNodeBackend), rnode_comparator);
 
 	for (i = 0; i < NBuffers; i++)
 	{
-		RelFileNode *rnode = NULL;
+		RelFileNodeBackend *rnode = NULL;
 		BufferDesc *bufHdr = GetBufferDescriptor(i);
 		uint32		buf_state;
 
@@ -3044,7 +3046,7 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 
 			for (j = 0; j < n; j++)
 			{
-				if (RelFileNodeEquals(bufHdr->tag.rnode, nodes[j]))
+				if (RelFileNodeBackendEquals(bufHdr->tag.rnode, nodes[j]))
 				{
 					rnode = &nodes[j];
 					break;
@@ -3054,7 +3056,7 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 		else
 		{
 			rnode = bsearch((const void *) &(bufHdr->tag.rnode),
-							nodes, n, sizeof(RelFileNode),
+							nodes, n, sizeof(RelFileNodeBackend),
 							rnode_comparator);
 		}
 
@@ -3063,7 +3065,7 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 			continue;
 
 		buf_state = LockBufHdr(bufHdr);
-		if (RelFileNodeEquals(bufHdr->tag.rnode, (*rnode)))
+		if (RelFileNodeBackendEquals(bufHdr->tag.rnode, (*rnode)))
 			InvalidateBuffer(bufHdr);	/* releases spinlock */
 		else
 			UnlockBufHdr(bufHdr, buf_state);
@@ -3102,11 +3104,11 @@ DropDatabaseBuffers(Oid dbid)
 		 * As in DropRelFileNodeBuffers, an unlocked precheck should be safe
 		 * and saves some cycles.
 		 */
-		if (bufHdr->tag.rnode.dbNode != dbid)
+		if (bufHdr->tag.rnode.node.dbNode != dbid)
 			continue;
 
 		buf_state = LockBufHdr(bufHdr);
-		if (bufHdr->tag.rnode.dbNode == dbid)
+		if (bufHdr->tag.rnode.node.dbNode == dbid)
 			InvalidateBuffer(bufHdr);	/* releases spinlock */
 		else
 			UnlockBufHdr(bufHdr, buf_state);
@@ -3136,7 +3138,7 @@ PrintBufferDescs(void)
 			 "[%02d] (freeNext=%d, rel=%s, "
 			 "blockNum=%u, flags=0x%x, refcount=%u %d)",
 			 i, buf->freeNext,
-			 relpathbackend(buf->tag.rnode, InvalidBackendId, buf->tag.forkNum),
+			 relpath(buf->tag.rnode, buf->tag.forkNum),
 			 buf->tag.blockNum, buf->flags,
 			 buf->refcount, GetPrivateRefCount(b));
 	}
@@ -3204,7 +3206,8 @@ FlushRelationBuffers(Relation rel)
 			uint32		buf_state;
 
 			bufHdr = GetLocalBufferDescriptor(i);
-			if (RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node) &&
+			if (RelFileNodeEquals(bufHdr->tag.rnode.node, rel->rd_node) &&
+				bufHdr->tag.rnode.backend == rel->rd_backend &&
 				((buf_state = pg_atomic_read_u32(&bufHdr->state)) &
 				 (BM_VALID | BM_DIRTY)) == (BM_VALID | BM_DIRTY))
 			{
@@ -3251,13 +3254,15 @@ FlushRelationBuffers(Relation rel)
 		 * As in DropRelFileNodeBuffers, an unlocked precheck should be safe
 		 * and saves some cycles.
 		 */
-		if (!RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node))
+		if (!RelFileNodeEquals(bufHdr->tag.rnode.node, rel->rd_node)
+			|| bufHdr->tag.rnode.backend != rel->rd_backend)
 			continue;
 
 		ReservePrivateRefCountEntry();
 
 		buf_state = LockBufHdr(bufHdr);
-		if (RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node) &&
+		if (RelFileNodeEquals(bufHdr->tag.rnode.node, rel->rd_node) &&
+			bufHdr->tag.rnode.backend == rel->rd_backend &&
 			(buf_state & (BM_VALID | BM_DIRTY)) == (BM_VALID | BM_DIRTY))
 		{
 			PinBuffer_Locked(bufHdr);
@@ -3305,13 +3310,13 @@ FlushDatabaseBuffers(Oid dbid)
 		 * As in DropRelFileNodeBuffers, an unlocked precheck should be safe
 		 * and saves some cycles.
 		 */
-		if (bufHdr->tag.rnode.dbNode != dbid)
+		if (bufHdr->tag.rnode.node.dbNode != dbid)
 			continue;
 
 		ReservePrivateRefCountEntry();
 
 		buf_state = LockBufHdr(bufHdr);
-		if (bufHdr->tag.rnode.dbNode == dbid &&
+		if (bufHdr->tag.rnode.node.dbNode == dbid &&
 			(buf_state & (BM_VALID | BM_DIRTY)) == (BM_VALID | BM_DIRTY))
 		{
 			PinBuffer_Locked(bufHdr);
@@ -4051,7 +4056,7 @@ AbortBufferIO(void)
 				/* Buffer is pinned, so we can read tag without spinlock */
 				char	   *path;
 
-				path = relpathperm(buf->tag.rnode, buf->tag.forkNum);
+				path = relpath(buf->tag.rnode, buf->tag.forkNum);
 				ereport(WARNING,
 						(errcode(ERRCODE_IO_ERROR),
 						 errmsg("could not write block %u of %s",
@@ -4075,7 +4080,7 @@ shared_buffer_write_error_callback(void *arg)
 	/* Buffer is pinned, so we can read the tag without locking the spinlock */
 	if (bufHdr != NULL)
 	{
-		char	   *path = relpathperm(bufHdr->tag.rnode, bufHdr->tag.forkNum);
+		char	   *path = relpath(bufHdr->tag.rnode, bufHdr->tag.forkNum);
 
 		errcontext("writing block %u of relation %s",
 				   bufHdr->tag.blockNum, path);
@@ -4093,7 +4098,7 @@ local_buffer_write_error_callback(void *arg)
 
 	if (bufHdr != NULL)
 	{
-		char	   *path = relpathbackend(bufHdr->tag.rnode, MyBackendId,
+		char	   *path = relpathbackend(bufHdr->tag.rnode.node, MyBackendId,
 										  bufHdr->tag.forkNum);
 
 		errcontext("writing block %u of relation %s",
@@ -4108,22 +4113,27 @@ local_buffer_write_error_callback(void *arg)
 static int
 rnode_comparator(const void *p1, const void *p2)
 {
-	RelFileNode n1 = *(const RelFileNode *) p1;
-	RelFileNode n2 = *(const RelFileNode *) p2;
+	RelFileNodeBackend n1 = *(const RelFileNodeBackend *) p1;
+	RelFileNodeBackend n2 = *(const RelFileNodeBackend *) p2;
 
-	if (n1.relNode < n2.relNode)
+	if (n1.node.relNode < n2.node.relNode)
 		return -1;
-	else if (n1.relNode > n2.relNode)
+	else if (n1.node.relNode > n2.node.relNode)
 		return 1;
 
-	if (n1.dbNode < n2.dbNode)
+	if (n1.node.dbNode < n2.node.dbNode)
 		return -1;
-	else if (n1.dbNode > n2.dbNode)
+	else if (n1.node.dbNode > n2.node.dbNode)
 		return 1;
 
-	if (n1.spcNode < n2.spcNode)
+	if (n1.node.spcNode < n2.node.spcNode)
 		return -1;
-	else if (n1.spcNode > n2.spcNode)
+	else if (n1.node.spcNode > n2.node.spcNode)
+		return 1;
+
+	if (n1.backend < n2.backend)
+		return -1;
+	else if (n1.backend > n2.backend)
 		return 1;
 	else
 		return 0;
@@ -4359,7 +4369,7 @@ IssuePendingWritebacks(WritebackContext *context)
 			next = &context->pending_writebacks[i + ahead + 1];
 
 			/* different file, stop */
-			if (!RelFileNodeEquals(cur->tag.rnode, next->tag.rnode) ||
+			if (!RelFileNodeBackendEquals(cur->tag.rnode, next->tag.rnode) ||
 				cur->tag.forkNum != next->tag.forkNum)
 				break;
 
@@ -4378,7 +4388,7 @@ IssuePendingWritebacks(WritebackContext *context)
 		i += ahead;
 
 		/* and finally tell the kernel to write the data to storage */
-		reln = smgropen(tag.rnode, InvalidBackendId);
+		reln = smgropen(tag.rnode.node, tag.rnode.backend);
 		smgrwriteback(reln, tag.forkNum, tag.blockNum, nblocks);
 	}
 
diff --git a/src/backend/storage/buffer/localbuf.c b/src/backend/storage/buffer/localbuf.c
index f5f6a29..6bd5ecb 100644
--- a/src/backend/storage/buffer/localbuf.c
+++ b/src/backend/storage/buffer/localbuf.c
@@ -68,7 +68,7 @@ LocalPrefetchBuffer(SMgrRelation smgr, ForkNumber forkNum,
 	BufferTag	newTag;			/* identity of requested block */
 	LocalBufferLookupEnt *hresult;
 
-	INIT_BUFFERTAG(newTag, smgr->smgr_rnode.node, forkNum, blockNum);
+	INIT_BUFFERTAG(newTag, smgr->smgr_rnode, forkNum, blockNum);
 
 	/* Initialize local buffers if first request in this session */
 	if (LocalBufHash == NULL)
@@ -111,7 +111,7 @@ LocalBufferAlloc(SMgrRelation smgr, ForkNumber forkNum, BlockNumber blockNum,
 	bool		found;
 	uint32		buf_state;
 
-	INIT_BUFFERTAG(newTag, smgr->smgr_rnode.node, forkNum, blockNum);
+	INIT_BUFFERTAG(newTag, smgr->smgr_rnode, forkNum, blockNum);
 
 	/* Initialize local buffers if first request in this session */
 	if (LocalBufHash == NULL)
@@ -209,7 +209,7 @@ LocalBufferAlloc(SMgrRelation smgr, ForkNumber forkNum, BlockNumber blockNum,
 		Page		localpage = (char *) LocalBufHdrGetBlock(bufHdr);
 
 		/* Find smgr relation for buffer */
-		oreln = smgropen(bufHdr->tag.rnode, MyBackendId);
+		oreln = smgropen(bufHdr->tag.rnode.node, MyBackendId);
 
 		PageSetChecksumInplace(localpage, bufHdr->tag.blockNum);
 
@@ -331,14 +331,14 @@ DropRelFileNodeLocalBuffers(RelFileNode rnode, ForkNumber forkNum,
 		buf_state = pg_atomic_read_u32(&bufHdr->state);
 
 		if ((buf_state & BM_TAG_VALID) &&
-			RelFileNodeEquals(bufHdr->tag.rnode, rnode) &&
+			RelFileNodeEquals(bufHdr->tag.rnode.node, rnode) &&
 			bufHdr->tag.forkNum == forkNum &&
 			bufHdr->tag.blockNum >= firstDelBlock)
 		{
 			if (LocalRefCount[i] != 0)
 				elog(ERROR, "block %u of %s is still referenced (local %u)",
 					 bufHdr->tag.blockNum,
-					 relpathbackend(bufHdr->tag.rnode, MyBackendId,
+					 relpathbackend(bufHdr->tag.rnode.node, MyBackendId,
 									bufHdr->tag.forkNum),
 					 LocalRefCount[i]);
 			/* Remove entry from hashtable */
@@ -377,12 +377,12 @@ DropRelFileNodeAllLocalBuffers(RelFileNode rnode)
 		buf_state = pg_atomic_read_u32(&bufHdr->state);
 
 		if ((buf_state & BM_TAG_VALID) &&
-			RelFileNodeEquals(bufHdr->tag.rnode, rnode))
+			RelFileNodeEquals(bufHdr->tag.rnode.node, rnode))
 		{
 			if (LocalRefCount[i] != 0)
 				elog(ERROR, "block %u of %s is still referenced (local %u)",
 					 bufHdr->tag.blockNum,
-					 relpathbackend(bufHdr->tag.rnode, MyBackendId,
+					 relpathbackend(bufHdr->tag.rnode.node, MyBackendId,
 									bufHdr->tag.forkNum),
 					 LocalRefCount[i]);
 			/* Remove entry from hashtable */
diff --git a/src/backend/storage/freespace/fsmpage.c b/src/backend/storage/freespace/fsmpage.c
index cf7f03f..65eb422 100644
--- a/src/backend/storage/freespace/fsmpage.c
+++ b/src/backend/storage/freespace/fsmpage.c
@@ -268,13 +268,13 @@ restart:
 			 *
 			 * Fix the corruption and restart.
 			 */
-			RelFileNode rnode;
+			RelFileNodeBackend rnode;
 			ForkNumber	forknum;
 			BlockNumber blknum;
 
 			BufferGetTag(buf, &rnode, &forknum, &blknum);
 			elog(DEBUG1, "fixing corrupt FSM block %u, relation %u/%u/%u",
-				 blknum, rnode.spcNode, rnode.dbNode, rnode.relNode);
+				 blknum, rnode.node.spcNode, rnode.node.dbNode, rnode.node.relNode);
 
 			/* make sure we hold an exclusive lock */
 			if (!exclusive_lock_held)
diff --git a/src/backend/storage/smgr/md.c b/src/backend/storage/smgr/md.c
index 07f3c93..204c4cb 100644
--- a/src/backend/storage/smgr/md.c
+++ b/src/backend/storage/smgr/md.c
@@ -33,6 +33,7 @@
 #include "postmaster/bgwriter.h"
 #include "storage/fd.h"
 #include "storage/bufmgr.h"
+#include "storage/ipc.h"
 #include "storage/md.h"
 #include "storage/relfilenode.h"
 #include "storage/smgr.h"
@@ -87,6 +88,18 @@ typedef struct _MdfdVec
 
 static MemoryContext MdCxt;		/* context for all MdfdVec objects */
 
+/*
+ * Structure used to collect information created by this backend.
+ * Data of this related should be deleted on backend exit.
+ */
+typedef struct SessionRelation
+{
+	RelFileNodeBackend rnode;
+	struct SessionRelation* next;
+} SessionRelation;
+
+
+static SessionRelation* SessionRelations;
 
 /* Populate a file tag describing an md.c segment file. */
 #define INIT_MD_FILETAG(a,xx_rnode,xx_forknum,xx_segno) \
@@ -152,6 +165,48 @@ mdinit(void)
 								  ALLOCSET_DEFAULT_SIZES);
 }
 
+
+/*
+ * Delete all data of session relations and remove their pages from shared buffers.
+ * This function is called on backend exit.
+ */
+static void
+TruncateSessionRelations(int code, Datum arg)
+{
+	SessionRelation* rel;
+	for (rel = SessionRelations; rel != NULL; rel = rel->next)
+	{
+		/* Remove relation pages from shared buffers */
+		DropRelFileNodesAllBuffers(&rel->rnode, 1);
+
+		/* Delete relation files */
+		mdunlink(rel->rnode, InvalidForkNumber, false);
+	}
+}
+
+/*
+ * Maintain information about session relations accessed by this backend.
+ * This list is needed to perform cleanup on backend exit.
+ * Session relation is linked in this list when this relation is created or opened and file doesn't exist.
+ * Such procedure guarantee that each relation is linked into list only once.
+ */
+static void
+RegisterSessionRelation(SMgrRelation reln)
+{
+	SessionRelation* rel = (SessionRelation*)MemoryContextAlloc(TopMemoryContext, sizeof(SessionRelation));
+
+	/*
+	 * Perform session relation cleanup on backend exit. We are using shared memory hook, because
+	 * cleanup should be performed before backend is disconnected from shared memory.
+	 */
+	if (SessionRelations == NULL)
+		on_shmem_exit(TruncateSessionRelations, 0);
+
+	rel->rnode = reln->smgr_rnode;
+	rel->next = SessionRelations;
+	SessionRelations = rel;
+}
+
 /*
  *	mdexists() -- Does the physical file exist?
  *
@@ -218,6 +273,8 @@ mdcreate(SMgrRelation reln, ForkNumber forkNum, bool isRedo)
 					 errmsg("could not create file \"%s\": %m", path)));
 		}
 	}
+	if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		RegisterSessionRelation(reln);
 
 	pfree(path);
 
@@ -465,6 +522,19 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 
 	if (fd < 0)
 	{
+		/*
+		 * In case of session relation access, there may be no yet files of this relation for this backend.
+		 * If so, then create file and register session relation for truncation on backend exit.
+		 */
+		if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
+			fd = PathNameOpenFile(path, O_RDWR | PG_BINARY | O_CREAT);
+			if (fd >= 0)
+			{
+				RegisterSessionRelation(reln);
+				goto NewSegment;
+			}
+		}
 		if ((behavior & EXTENSION_RETURN_NULL) &&
 			FILE_POSSIBLY_DELETED(errno))
 		{
@@ -476,6 +546,7 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 				 errmsg("could not open file \"%s\": %m", path)));
 	}
 
+  NewSegment:
 	pfree(path);
 
 	_fdvec_resize(reln, forknum, 1);
@@ -652,8 +723,13 @@ mdread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
 		 * complaining.  This allows, for example, the case of trying to
 		 * update a block that was later truncated away.
 		 */
-		if (zero_damaged_pages || InRecovery)
+		if (zero_damaged_pages || InRecovery || RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
 			MemSet(buffer, 0, BLCKSZ);
+			/* In case of session relation we need to write zero page to provide correct result of subsequent mdnblocks */
+			if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+				mdwrite(reln, forknum, blocknum, buffer, true);
+		}
 		else
 			ereport(ERROR,
 					(errcode(ERRCODE_DATA_CORRUPTED),
@@ -738,12 +814,18 @@ mdwrite(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
 BlockNumber
 mdnblocks(SMgrRelation reln, ForkNumber forknum)
 {
-	MdfdVec    *v = mdopenfork(reln, forknum, EXTENSION_FAIL);
+	/*
+	 * If we access session relation, there may be no files yet of this relation for this backend.
+	 * Pass EXTENSION_RETURN_NULL to make mdopen return NULL in this case instead of reporting error.
+	 */
+	MdfdVec    *v = mdopenfork(reln, forknum, RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode)
+							   ? EXTENSION_RETURN_NULL : EXTENSION_FAIL);
 	BlockNumber nblocks;
 	BlockNumber segno = 0;
 
 	/* mdopen has opened the first segment */
-	Assert(reln->md_num_open_segs[forknum] > 0);
+	if (reln->md_num_open_segs[forknum] == 0)
+		return 0;
 
 	/*
 	 * Start from the last open segments, to avoid redundant seeks.  We have
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index a87e721..2401361 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -994,6 +994,9 @@ pg_relation_filepath(PG_FUNCTION_ARGS)
 	/* Determine owning backend. */
 	switch (relform->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c
index 2488607..86e8fca 100644
--- a/src/backend/utils/cache/relcache.c
+++ b/src/backend/utils/cache/relcache.c
@@ -1098,6 +1098,10 @@ RelationBuildDesc(Oid targetRelId, bool insertIt)
 	relation->rd_newRelfilenodeSubid = InvalidSubTransactionId;
 	switch (relation->rd_rel->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			relation->rd_backend = BackendIdForSessionRelations();
+			relation->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			relation->rd_backend = InvalidBackendId;
@@ -3301,6 +3305,10 @@ RelationBuildLocalRelation(const char *relname,
 	rel->rd_rel->relpersistence = relpersistence;
 	switch (relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			rel->rd_backend = BackendIdForSessionRelations();
+			rel->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			rel->rd_backend = InvalidBackendId;
diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
index 0cc9ede..1dff0c8 100644
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -15593,8 +15593,8 @@ dumpTableSchema(Archive *fout, TableInfo *tbinfo)
 											 tbinfo->dobj.catId.oid, false);
 
 		appendPQExpBuffer(q, "CREATE %s%s %s",
-						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ?
-						  "UNLOGGED " : "",
+						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ? "UNLOGGED "
+						  : tbinfo->relpersistence == RELPERSISTENCE_SESSION ? "SESSION " : "",
 						  reltypename,
 						  qualrelname);
 
diff --git a/src/common/relpath.c b/src/common/relpath.c
index 62b9553..cef99d2 100644
--- a/src/common/relpath.c
+++ b/src/common/relpath.c
@@ -166,7 +166,18 @@ GetRelationPath(Oid dbNode, Oid spcNode, Oid relNode,
 		}
 		else
 		{
-			if (forkNumber != MAIN_FORKNUM)
+			/*
+			 * Session relations are distinguished from local temp relations by adding
+			 * SessionRelFirstBackendId offset to backendId.
+			 * These is no need to separate them at file system level, so just subtract SessionRelFirstBackendId
+			 * to avoid too long file names.
+			 * Segments of session relations have the same prefix (t%d_) as local temporary relations
+			 * to make it possible to cleanup them in the same way as local temporary relation files.
+			 */
+			 if (backendId >= SessionRelFirstBackendId)
+				 backendId -= SessionRelFirstBackendId;
+
+			 if (forkNumber != MAIN_FORKNUM)
 				path = psprintf("base/%u/t%d_%u_%s",
 								dbNode, backendId, relNode,
 								forkNames[forkNumber]);
diff --git a/src/include/catalog/pg_class.h b/src/include/catalog/pg_class.h
index 090b6ba..6a39663 100644
--- a/src/include/catalog/pg_class.h
+++ b/src/include/catalog/pg_class.h
@@ -165,6 +165,7 @@ typedef FormData_pg_class *Form_pg_class;
 #define		  RELPERSISTENCE_PERMANENT	'p' /* regular table */
 #define		  RELPERSISTENCE_UNLOGGED	'u' /* unlogged permanent table */
 #define		  RELPERSISTENCE_TEMP		't' /* temporary table */
+#define		  RELPERSISTENCE_SESSION	's' /* session table */
 
 /* default selection for replica identity (primary key or nothing) */
 #define		  REPLICA_IDENTITY_DEFAULT	'd'
diff --git a/src/include/storage/backendid.h b/src/include/storage/backendid.h
index 70ef8eb..f226e7c 100644
--- a/src/include/storage/backendid.h
+++ b/src/include/storage/backendid.h
@@ -22,6 +22,13 @@ typedef int BackendId;			/* unique currently active backend identifier */
 
 #define InvalidBackendId		(-1)
 
+/*
+ * We need to distinguish local and global temporary relations by RelFileNodeBackend.
+ * The least invasive change is to add some special bias value to backend id (since 
+ * maximal number of backed is limited by MaxBackends).
+ */
+#define SessionRelFirstBackendId (0x40000000)
+
 extern PGDLLIMPORT BackendId MyBackendId;	/* backend id of this backend */
 
 /* backend id of our parallel session leader, or InvalidBackendId if none */
@@ -34,4 +41,10 @@ extern PGDLLIMPORT BackendId ParallelMasterBackendId;
 #define BackendIdForTempRelations() \
 	(ParallelMasterBackendId == InvalidBackendId ? MyBackendId : ParallelMasterBackendId)
 
+
+#define BackendIdForSessionRelations() \
+	(BackendIdForTempRelations() + SessionRelFirstBackendId)
+
+#define IsSessionRelationBackendId(id) ((id) >= SessionRelFirstBackendId)
+
 #endif							/* BACKENDID_H */
diff --git a/src/include/storage/buf_internals.h b/src/include/storage/buf_internals.h
index df2dda7..7adb96b 100644
--- a/src/include/storage/buf_internals.h
+++ b/src/include/storage/buf_internals.h
@@ -90,16 +90,17 @@
  */
 typedef struct buftag
 {
-	RelFileNode rnode;			/* physical relation identifier */
+	RelFileNodeBackend rnode;			/* physical relation identifier */
 	ForkNumber	forkNum;
 	BlockNumber blockNum;		/* blknum relative to begin of reln */
 } BufferTag;
 
 #define CLEAR_BUFFERTAG(a) \
 ( \
-	(a).rnode.spcNode = InvalidOid, \
-	(a).rnode.dbNode = InvalidOid, \
-	(a).rnode.relNode = InvalidOid, \
+	(a).rnode.node.spcNode = InvalidOid, \
+	(a).rnode.node.dbNode = InvalidOid, \
+	(a).rnode.node.relNode = InvalidOid, \
+	(a).rnode.backend = InvalidBackendId, \
 	(a).forkNum = InvalidForkNumber, \
 	(a).blockNum = InvalidBlockNumber \
 )
@@ -113,7 +114,7 @@ typedef struct buftag
 
 #define BUFFERTAGS_EQUAL(a,b) \
 ( \
-	RelFileNodeEquals((a).rnode, (b).rnode) && \
+	RelFileNodeBackendEquals((a).rnode, (b).rnode) && \
 	(a).blockNum == (b).blockNum && \
 	(a).forkNum == (b).forkNum \
 )
diff --git a/src/include/storage/bufmgr.h b/src/include/storage/bufmgr.h
index 509f4b7..3315fa0 100644
--- a/src/include/storage/bufmgr.h
+++ b/src/include/storage/bufmgr.h
@@ -205,7 +205,7 @@ extern XLogRecPtr BufferGetLSNAtomic(Buffer buffer);
 extern void PrintPinnedBufs(void);
 #endif
 extern Size BufferShmemSize(void);
-extern void BufferGetTag(Buffer buffer, RelFileNode *rnode,
+extern void BufferGetTag(Buffer buffer, RelFileNodeBackend *rnode,
 						 ForkNumber *forknum, BlockNumber *blknum);
 
 extern void MarkBufferDirtyHint(Buffer buffer, bool buffer_std);
diff --git a/src/include/storage/bufpage.h b/src/include/storage/bufpage.h
index 4ef6d8d..bac7a31 100644
--- a/src/include/storage/bufpage.h
+++ b/src/include/storage/bufpage.h
@@ -229,6 +229,13 @@ typedef PageHeaderData *PageHeader;
 #define PageIsNew(page) (((PageHeader) (page))->pd_upper == 0)
 
 /*
+ * Page of temporary relation is not initialized
+ */
+#define GlobalTempRelationPageIsNotInitialized(rel, page) \
+	((rel)->rd_rel->relpersistence == RELPERSISTENCE_SESSION && PageIsNew(page))
+
+
+/*
  * PageGetItemId
  *		Returns an item identifier of a page.
  */
diff --git a/src/include/storage/relfilenode.h b/src/include/storage/relfilenode.h
index 586500a..20aec72 100644
--- a/src/include/storage/relfilenode.h
+++ b/src/include/storage/relfilenode.h
@@ -75,10 +75,25 @@ typedef struct RelFileNodeBackend
 	BackendId	backend;
 } RelFileNodeBackend;
 
+/*
+ * Check whether it is local or global temporary relation, which data belongs only to one backend.
+ */
 #define RelFileNodeBackendIsTemp(rnode) \
 	((rnode).backend != InvalidBackendId)
 
 /*
+ * Check whether it is global temporary relation which metadata is shared by all sessions,
+ * but data is private for the current session.
+ */
+#define RelFileNodeBackendIsGlobalTemp(rnode) IsSessionRelationBackendId((rnode).backend)
+
+/*
+ * Check whether it is local temporary relation which exists only in this backend.
+ */
+#define RelFileNodeBackendIsLocalTemp(rnode) \
+	(RelFileNodeBackendIsTemp(rnode) && !RelFileNodeBackendIsGlobalTemp(rnode))
+
+/*
  * Note: RelFileNodeEquals and RelFileNodeBackendEquals compare relNode first
  * since that is most likely to be different in two unequal RelFileNodes.  It
  * is probably redundant to compare spcNode if the other fields are found equal,
diff --git a/src/include/utils/rel.h b/src/include/utils/rel.h
index b0fe19e..b361851 100644
--- a/src/include/utils/rel.h
+++ b/src/include/utils/rel.h
@@ -328,6 +328,17 @@ typedef struct StdRdOptions
 	((relation)->rd_options ? \
 	 ((StdRdOptions *) (relation)->rd_options)->parallel_workers : (defaultpw))
 
+/*
+ * Relation persistence is either TEMP either SESSION
+ */
+#define IsLocalRelpersistence(relpersistence) \
+	((relpersistence) == RELPERSISTENCE_TEMP || (relpersistence) == RELPERSISTENCE_SESSION)
+
+/*
+ * Relation is either global either local temp table
+ */
+#define RelationHasSessionScope(relation) \
+	IsLocalRelpersistence(((relation)->rd_rel->relpersistence))
 
 /*
  * ViewOptions
diff --git a/src/test/isolation/expected/inherit-global-temp.out b/src/test/isolation/expected/inherit-global-temp.out
new file mode 100644
index 0000000..6114f8c
--- /dev/null
+++ b/src/test/isolation/expected/inherit-global-temp.out
@@ -0,0 +1,218 @@
+Parsed test spec with 2 sessions
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_update_p s1_update_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_update_p: UPDATE inh_global_parent SET a = 11 WHERE a = 1;
+step s1_update_c: UPDATE inh_global_parent SET a = 13 WHERE a IN (3, 5);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+2              
+11             
+4              
+13             
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+4              
+13             
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+2              
+11             
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_update_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_update_c: UPDATE inh_global_parent SET a = 15 WHERE a IN (3, 5);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+6              
+15             
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+6              
+15             
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_delete_p s1_delete_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_delete_p: DELETE FROM inh_global_parent WHERE a = 2;
+step s1_delete_c: DELETE FROM inh_global_parent WHERE a IN (4, 6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+3              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_delete_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_delete_c: DELETE FROM inh_global_parent WHERE a IN (4, 6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+5              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_truncate_p s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_truncate_p s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_truncate_p: TRUNCATE inh_global_parent;
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_begin s1_truncate_p s2_select_p s1_commit
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_begin: BEGIN;
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s2_select_p: SELECT a FROM inh_global_parent; <waiting ...>
+step s1_commit: COMMIT;
+step s2_select_p: <... completed>
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_begin s1_truncate_p s2_select_c s1_commit
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_begin: BEGIN;
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2; <waiting ...>
+step s1_commit: COMMIT;
+step s2_select_c: <... completed>
+a              
+
+5              
+6              
diff --git a/src/test/isolation/isolation_schedule b/src/test/isolation/isolation_schedule
index 74b5077..44df4e0 100644
--- a/src/test/isolation/isolation_schedule
+++ b/src/test/isolation/isolation_schedule
@@ -85,3 +85,4 @@ test: plpgsql-toast
 test: truncate-conflict
 test: serializable-parallel
 test: serializable-parallel-2
+test: inherit-global-temp
diff --git a/src/test/isolation/specs/inherit-global-temp.spec b/src/test/isolation/specs/inherit-global-temp.spec
new file mode 100644
index 0000000..5e95dd6
--- /dev/null
+++ b/src/test/isolation/specs/inherit-global-temp.spec
@@ -0,0 +1,73 @@
+# This is a copy of the inherit-temp test with little changes for global temporary tables.
+#
+
+setup
+{
+  CREATE TABLE inh_global_parent (a int);
+}
+
+teardown
+{
+  DROP TABLE inh_global_parent;
+}
+
+# Session 1 executes actions which act directly on both the parent and
+# its child.  Abbreviation "c" is used for queries working on the child
+# and "p" on the parent.
+session "s1"
+setup
+{
+  CREATE GLOBAL TEMPORARY TABLE inh_global_temp_child_s1 () INHERITS (inh_global_parent);
+}
+step "s1_begin" { BEGIN; }
+step "s1_truncate_p" { TRUNCATE inh_global_parent; }
+step "s1_select_p" { SELECT a FROM inh_global_parent; }
+step "s1_select_c" { SELECT a FROM inh_global_temp_child_s1; }
+step "s1_insert_p" { INSERT INTO inh_global_parent VALUES (1), (2); }
+step "s1_insert_c" { INSERT INTO inh_global_temp_child_s1 VALUES (3), (4); }
+step "s1_update_p" { UPDATE inh_global_parent SET a = 11 WHERE a = 1; }
+step "s1_update_c" { UPDATE inh_global_parent SET a = 13 WHERE a IN (3, 5); }
+step "s1_delete_p" { DELETE FROM inh_global_parent WHERE a = 2; }
+step "s1_delete_c" { DELETE FROM inh_global_parent WHERE a IN (4, 6); }
+step "s1_commit" { COMMIT; }
+teardown
+{
+  DROP TABLE inh_global_temp_child_s1;
+}
+
+# Session 2 executes actions on the parent which act only on the child.
+session "s2"
+setup
+{
+  CREATE GLOBAL TEMPORARY TABLE inh_global_temp_child_s2 () INHERITS (inh_global_parent);
+}
+step "s2_truncate_p" { TRUNCATE inh_global_parent; }
+step "s2_select_p" { SELECT a FROM inh_global_parent; }
+step "s2_select_c" { SELECT a FROM inh_global_temp_child_s2; }
+step "s2_insert_c" { INSERT INTO inh_global_temp_child_s2 VALUES (5), (6); }
+step "s2_update_c" { UPDATE inh_global_parent SET a = 15 WHERE a IN (3, 5); }
+step "s2_delete_c" { DELETE FROM inh_global_parent WHERE a IN (4, 6); }
+teardown
+{
+  DROP TABLE inh_global_temp_child_s2;
+}
+
+# Check INSERT behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check UPDATE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_update_p" "s1_update_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_update_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check DELETE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_delete_p" "s1_delete_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_delete_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check TRUNCATE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_truncate_p" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_truncate_p" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# TRUNCATE on a parent tree does not block access to temporary child relation
+# of another session, and blocks when scanning the parent.
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_begin" "s1_truncate_p" "s2_select_p" "s1_commit"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_begin" "s1_truncate_p" "s2_select_c" "s1_commit"
diff --git a/src/test/regress/expected/global_temp.out b/src/test/regress/expected/global_temp.out
new file mode 100644
index 0000000..ae1adb6
--- /dev/null
+++ b/src/test/regress/expected/global_temp.out
@@ -0,0 +1,247 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+-- Test ON COMMIT DELETE ROWS
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+   2
+(2 rows)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+(1 row)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+ col 
+-----
+   1
+(1 row)
+
+SELECT * FROM global_temptest2;
+ col 
+-----
+(0 rows)
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+ERROR:  unsupported ON COMMIT and foreign key combination
+DETAIL:  Table "global_temptest4" references "global_temptest3", but they do not have the same ON COMMIT setting.
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+ a 
+---
+(0 rows)
+
+DROP TABLE temp_parted_oncommit;
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+              relname              
+-----------------------------------
+ global_temp_parted_oncommit_test
+ global_temp_parted_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_parted_oncommit_test;
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+            relname             
+--------------------------------
+ global_temp_inh_oncommit_test
+ global_temp_inh_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ERROR:  cannot inherit from temporary relation "global_temp_table"
+ROLLBACK;
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM global_temp_table;
+ a 
+---
+ 1
+(1 row)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+(2 rows)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       1
+(1 row)
+
+\c
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+(0 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       2
+(1 row)
+
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       3
+(1 row)
+
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
diff --git a/src/test/regress/expected/session_table.out b/src/test/regress/expected/session_table.out
new file mode 100644
index 0000000..1b9b3f4
--- /dev/null
+++ b/src/test/regress/expected/session_table.out
@@ -0,0 +1,64 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+ count 
+-------
+ 10000
+(1 row)
+
+\c
+select count(*) from my_private_table;
+ count 
+-------
+     0
+(1 row)
+
+select * from my_private_table where x=10001;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select * from my_private_table where y=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select count(*) from my_private_table;
+ count  
+--------
+ 100000
+(1 row)
+
+\c
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+   x    |   y    
+--------+--------
+ 100000 | 100000
+(1 row)
+
+drop table  my_private_table;
diff --git a/src/test/regress/parallel_schedule b/src/test/regress/parallel_schedule
index fc0f141..507cf7d 100644
--- a/src/test/regress/parallel_schedule
+++ b/src/test/regress/parallel_schedule
@@ -107,7 +107,7 @@ test: json jsonb json_encoding jsonpath jsonpath_encoding jsonb_jsonpath
 # NB: temp.sql does a reconnect which transiently uses 2 connections,
 # so keep this parallel group to at most 19 tests
 # ----------
-test: plancache limit plpgsql copy2 temp domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
+test: plancache limit plpgsql copy2 temp global_temp session_table domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
 
 # ----------
 # Another group of parallel tests
diff --git a/src/test/regress/serial_schedule b/src/test/regress/serial_schedule
index 68ac56a..3890777 100644
--- a/src/test/regress/serial_schedule
+++ b/src/test/regress/serial_schedule
@@ -172,6 +172,8 @@ test: limit
 test: plpgsql
 test: copy2
 test: temp
+test: global_temp
+test: session_table
 test: domain
 test: rangefuncs
 test: prepare
diff --git a/src/test/regress/sql/global_temp.sql b/src/test/regress/sql/global_temp.sql
new file mode 100644
index 0000000..3058b9b
--- /dev/null
+++ b/src/test/regress/sql/global_temp.sql
@@ -0,0 +1,151 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+
+-- Test ON COMMIT DELETE ROWS
+
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+SELECT * FROM global_temptest2;
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+DROP TABLE temp_parted_oncommit;
+
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+DROP TABLE global_temp_parted_oncommit_test;
+
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ROLLBACK;
+
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+COMMIT;
+SELECT * FROM global_temp_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+COMMIT;
+SELECT * FROM normal_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+\c
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
diff --git a/src/test/regress/sql/session_table.sql b/src/test/regress/sql/session_table.sql
new file mode 100644
index 0000000..c6663dc
--- /dev/null
+++ b/src/test/regress/sql/session_table.sql
@@ -0,0 +1,18 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+\c
+select count(*) from my_private_table;
+select * from my_private_table where x=10001;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+select * from my_private_table where y=10001;
+select count(*) from my_private_table;
+\c
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+drop table  my_private_table;

diff --git a/src/backend/access/gist/gistutil.c b/src/backend/access/gist/gistutil.c
index 9726020..c99701d 100644
--- a/src/backend/access/gist/gistutil.c
+++ b/src/backend/access/gist/gistutil.c
@@ -1028,7 +1028,7 @@ gistGetFakeLSN(Relation rel)
 {
 	static XLogRecPtr counter = FirstNormalUnloggedLSN;
 
-	if (rel->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
+	if (RelationHasSessionScope(rel))
 	{
 		/*
 		 * Temporary relations are only accessible in our session, so a simple
diff --git a/src/backend/access/heap/heapam_handler.c b/src/backend/access/heap/heapam_handler.c
index f1ff01e..e92d324 100644
--- a/src/backend/access/heap/heapam_handler.c
+++ b/src/backend/access/heap/heapam_handler.c
@@ -673,6 +673,7 @@ heapam_relation_copy_data(Relation rel, const RelFileNode *newrnode)
 			 * init fork of an unlogged relation.
 			 */
 			if (rel->rd_rel->relpersistence == RELPERSISTENCE_PERMANENT ||
+				rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ||
 				(rel->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED &&
 				 forkNum == INIT_FORKNUM))
 				log_smgrcreate(newrnode, forkNum);
diff --git a/src/backend/access/nbtree/nbtpage.c b/src/backend/access/nbtree/nbtpage.c
index 9c1f7de..97cc9e4 100644
--- a/src/backend/access/nbtree/nbtpage.c
+++ b/src/backend/access/nbtree/nbtpage.c
@@ -763,7 +763,11 @@ _bt_getbuf(Relation rel, BlockNumber blkno, int access)
 		/* Read an existing block of the relation */
 		buf = ReadBuffer(rel, blkno);
 		LockBuffer(buf, access);
-		_bt_checkpage(rel, buf);
+		/* Session temporary relation may be not yet initialized for this backend. */
+		if (blkno == BTREE_METAPAGE && GlobalTempRelationPageIsNotInitialized(rel, BufferGetPage(buf)))
+			_bt_initmetapage(BufferGetPage(buf), P_NONE, 0);
+		else
+			_bt_checkpage(rel, buf);
 	}
 	else
 	{
diff --git a/src/backend/catalog/catalog.c b/src/backend/catalog/catalog.c
index a065419..8814afb 100644
--- a/src/backend/catalog/catalog.c
+++ b/src/backend/catalog/catalog.c
@@ -409,6 +409,9 @@ GetNewRelFileNode(Oid reltablespace, Relation pg_class, char relpersistence)
 		case RELPERSISTENCE_TEMP:
 			backend = BackendIdForTempRelations();
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 3e1d406..aaa2c49 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3590,7 +3590,7 @@ reindex_relation(Oid relid, int flags, int options)
 		if (flags & REINDEX_REL_FORCE_INDEXES_UNLOGGED)
 			persistence = RELPERSISTENCE_UNLOGGED;
 		else if (flags & REINDEX_REL_FORCE_INDEXES_PERMANENT)
-			persistence = RELPERSISTENCE_PERMANENT;
+			persistence = rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ? RELPERSISTENCE_SESSION : RELPERSISTENCE_PERMANENT;
 		else
 			persistence = rel->rd_rel->relpersistence;
 
diff --git a/src/backend/catalog/storage.c b/src/backend/catalog/storage.c
index 3cc886f..a111ddc 100644
--- a/src/backend/catalog/storage.c
+++ b/src/backend/catalog/storage.c
@@ -93,6 +93,10 @@ RelationCreateStorage(RelFileNode rnode, char relpersistence)
 			backend = InvalidBackendId;
 			needs_wal = false;
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			needs_wal = false;
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
 			needs_wal = true;
diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index cedb4ee..d11c5b3 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -1400,7 +1400,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap,
 	 */
 	if (newrelpersistence == RELPERSISTENCE_UNLOGGED)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_UNLOGGED;
-	else if (newrelpersistence == RELPERSISTENCE_PERMANENT)
+	else if (newrelpersistence != RELPERSISTENCE_TEMP)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_PERMANENT;
 
 	/* Report that we are now reindexing relations */
diff --git a/src/backend/commands/sequence.c b/src/backend/commands/sequence.c
index 0960b33..6c3998f 100644
--- a/src/backend/commands/sequence.c
+++ b/src/backend/commands/sequence.c
@@ -94,7 +94,7 @@ static HTAB *seqhashtab = NULL; /* hash table for SeqTable items */
  */
 static SeqTableData *last_used_seq = NULL;
 
-static void fill_seq_with_data(Relation rel, HeapTuple tuple);
+static void fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf);
 static Relation lock_and_open_sequence(SeqTable seq);
 static void create_seq_hashtable(void);
 static void init_sequence(Oid relid, SeqTable *p_elm, Relation *p_rel);
@@ -222,7 +222,7 @@ DefineSequence(ParseState *pstate, CreateSeqStmt *seq)
 
 	/* now initialize the sequence's data */
 	tuple = heap_form_tuple(tupDesc, value, null);
-	fill_seq_with_data(rel, tuple);
+	fill_seq_with_data(rel, tuple, InvalidBuffer);
 
 	/* process OWNED BY if given */
 	if (owned_by)
@@ -327,7 +327,7 @@ ResetSequence(Oid seq_relid)
 	/*
 	 * Insert the modified tuple into the new storage file.
 	 */
-	fill_seq_with_data(seq_rel, tuple);
+	fill_seq_with_data(seq_rel, tuple, InvalidBuffer);
 
 	/* Clear local cache so that we don't think we have cached numbers */
 	/* Note that we do not change the currval() state */
@@ -340,18 +340,21 @@ ResetSequence(Oid seq_relid)
  * Initialize a sequence's relation with the specified tuple as content
  */
 static void
-fill_seq_with_data(Relation rel, HeapTuple tuple)
+fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf)
 {
-	Buffer		buf;
 	Page		page;
 	sequence_magic *sm;
 	OffsetNumber offnum;
+	bool lockBuffer = false;
 
 	/* Initialize first page of relation with special magic number */
 
-	buf = ReadBuffer(rel, P_NEW);
-	Assert(BufferGetBlockNumber(buf) == 0);
-
+	if (buf == InvalidBuffer)
+	{
+		buf = ReadBuffer(rel, P_NEW);
+		Assert(BufferGetBlockNumber(buf) == 0);
+		lockBuffer = true;
+	}
 	page = BufferGetPage(buf);
 
 	PageInit(page, BufferGetPageSize(buf), sizeof(sequence_magic));
@@ -360,7 +363,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	/* Now insert sequence tuple */
 
-	LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
+	if (lockBuffer)
+		LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
 
 	/*
 	 * Since VACUUM does not process sequences, we have to force the tuple to
@@ -410,7 +414,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	END_CRIT_SECTION();
 
-	UnlockReleaseBuffer(buf);
+	if (lockBuffer)
+		UnlockReleaseBuffer(buf);
 }
 
 /*
@@ -502,7 +507,7 @@ AlterSequence(ParseState *pstate, AlterSeqStmt *stmt)
 		/*
 		 * Insert the modified tuple into the new storage file.
 		 */
-		fill_seq_with_data(seqrel, newdatatuple);
+		fill_seq_with_data(seqrel, newdatatuple, InvalidBuffer);
 	}
 
 	/* process OWNED BY if given */
@@ -1178,6 +1183,17 @@ read_seq_tuple(Relation rel, Buffer *buf, HeapTuple seqdatatuple)
 	LockBuffer(*buf, BUFFER_LOCK_EXCLUSIVE);
 
 	page = BufferGetPage(*buf);
+	if (GlobalTempRelationPageIsNotInitialized(rel, page))
+	{
+		/* Initialize sequence for global temporary tables */
+		Datum		value[SEQ_COL_LASTCOL] = {0};
+		bool		null[SEQ_COL_LASTCOL] = {false};
+		HeapTuple tuple;
+		value[SEQ_COL_LASTVAL-1] = Int64GetDatumFast(1); /* start sequence with 1 */
+		tuple = heap_form_tuple(RelationGetDescr(rel), value, null);
+		fill_seq_with_data(rel, tuple, *buf);
+	}
+
 	sm = (sequence_magic *) PageGetSpecialPointer(page);
 
 	if (sm->magic != SEQ_MAGIC)
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index fb2be10..a31f775 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -586,7 +586,7 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 	 * Check consistency of arguments
 	 */
 	if (stmt->oncommit != ONCOMMIT_NOOP
-		&& stmt->relation->relpersistence != RELPERSISTENCE_TEMP)
+		&& !IsLocalRelpersistence(stmt->relation->relpersistence))
 		ereport(ERROR,
 				(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 				 errmsg("ON COMMIT can only be used on temporary tables")));
@@ -1772,7 +1772,8 @@ ExecuteTruncateGuts(List *explicit_rels, List *relids, List *relids_logged,
 		 * table or the current physical file to be thrown away anyway.
 		 */
 		if (rel->rd_createSubid == mySubid ||
-			rel->rd_newRelfilenodeSubid == mySubid)
+			rel->rd_newRelfilenodeSubid == mySubid ||
+			rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
 		{
 			/* Immediate, non-rollbackable truncation is OK */
 			heap_truncate_one_rel(rel);
@@ -7678,6 +7679,12 @@ ATAddForeignKeyConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
 						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 						 errmsg("constraints on unlogged tables may reference only permanent or unlogged tables")));
 			break;
+		case RELPERSISTENCE_SESSION:
+			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
+				ereport(ERROR,
+						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+						 errmsg("constraints on session tables may reference only session tables")));
+			break;
 		case RELPERSISTENCE_TEMP:
 			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_TEMP)
 				ereport(ERROR,
@@ -14082,6 +14089,13 @@ ATPrepChangePersistence(Relation rel, bool toLogged)
 							RelationGetRelationName(rel)),
 					 errtable(rel)));
 			break;
+		case RELPERSISTENCE_SESSION:
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+					 errmsg("cannot change logged status of session table \"%s\"",
+							RelationGetRelationName(rel)),
+					 errtable(rel)));
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			if (toLogged)
 				/* nothing to do */
@@ -14569,14 +14583,7 @@ PreCommit_on_commit_actions(void)
 				/* Do nothing (there shouldn't be such entries, actually) */
 				break;
 			case ONCOMMIT_DELETE_ROWS:
-
-				/*
-				 * If this transaction hasn't accessed any temporary
-				 * relations, we can skip truncating ON COMMIT DELETE ROWS
-				 * tables, as they must still be empty.
-				 */
-				if ((MyXactFlags & XACT_FLAGS_ACCESSEDTEMPNAMESPACE))
-					oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
+				oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
 				break;
 			case ONCOMMIT_DROP:
 				oids_to_drop = lappend_oid(oids_to_drop, oc->relid);
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index c97bb36..f9b2000 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -3265,20 +3265,11 @@ OptTemp:	TEMPORARY					{ $$ = RELPERSISTENCE_TEMP; }
 			| TEMP						{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMPORARY			{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMP				{ $$ = RELPERSISTENCE_TEMP; }
-			| GLOBAL TEMPORARY
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
-			| GLOBAL TEMP
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
+			| GLOBAL TEMPORARY          { $$ = RELPERSISTENCE_SESSION; }
+			| GLOBAL TEMP               { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION                   { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMPORARY         { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMP              { $$ = RELPERSISTENCE_SESSION; }
 			| UNLOGGED					{ $$ = RELPERSISTENCE_UNLOGGED; }
 			| /*EMPTY*/					{ $$ = RELPERSISTENCE_PERMANENT; }
 		;
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index 6e5768c..ea6989b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -437,6 +437,14 @@ generateSerialExtraStmts(CreateStmtContext *cxt, ColumnDef *column,
 	seqstmt->options = seqoptions;
 
 	/*
+	 * Why we should not always use persistence of parent table?
+	 * Although it is prohibited to have unlogged sequences,
+	 * unlogged tables with SERIAL fields are accepted!
+	 */
+	if (cxt->relation->relpersistence != RELPERSISTENCE_UNLOGGED)
+		seqstmt->sequence->relpersistence = cxt->relation->relpersistence;
+
+	/*
 	 * If a sequence data type was specified, add it to the options.  Prepend
 	 * to the list rather than append; in case a user supplied their own AS
 	 * clause, the "redundant options" error will point to their occurrence,
diff --git a/src/backend/postmaster/autovacuum.c b/src/backend/postmaster/autovacuum.c
index 073f313..3383c35 100644
--- a/src/backend/postmaster/autovacuum.c
+++ b/src/backend/postmaster/autovacuum.c
@@ -2069,7 +2069,7 @@ do_autovacuum(void)
 		 * Check if it is a temp table (presumably, of some other backend's).
 		 * We cannot safely process other backends' temp tables.
 		 */
-		if (classForm->relpersistence == RELPERSISTENCE_TEMP)
+		if (IsLocalRelpersistence(classForm->relpersistence))
 		{
 			/*
 			 * We just ignore it if the owning backend is still active and
@@ -2154,7 +2154,7 @@ do_autovacuum(void)
 		/*
 		 * We cannot safely process other backends' temp tables, so skip 'em.
 		 */
-		if (classForm->relpersistence == RELPERSISTENCE_TEMP)
+		if (IsLocalRelpersistence(classForm->relpersistence))
 			continue;
 
 		relid = classForm->oid;
diff --git a/src/backend/storage/smgr/md.c b/src/backend/storage/smgr/md.c
index 07f3c93..5db79ec 100644
--- a/src/backend/storage/smgr/md.c
+++ b/src/backend/storage/smgr/md.c
@@ -33,6 +33,7 @@
 #include "postmaster/bgwriter.h"
 #include "storage/fd.h"
 #include "storage/bufmgr.h"
+#include "storage/ipc.h"
 #include "storage/md.h"
 #include "storage/relfilenode.h"
 #include "storage/smgr.h"
@@ -87,6 +88,18 @@ typedef struct _MdfdVec
 
 static MemoryContext MdCxt;		/* context for all MdfdVec objects */
 
+/*
+ * Structure used to collect information created by this backend.
+ * Data of this related should be deleted on backend exit.
+ */
+typedef struct SessionRelation
+{
+	RelFileNodeBackend rnode;
+	struct SessionRelation* next;
+} SessionRelation;
+
+
+static SessionRelation* SessionRelations;
 
 /* Populate a file tag describing an md.c segment file. */
 #define INIT_MD_FILETAG(a,xx_rnode,xx_forknum,xx_segno) \
@@ -152,6 +165,45 @@ mdinit(void)
 								  ALLOCSET_DEFAULT_SIZES);
 }
 
+
+/*
+ * Delete all data of session relations and remove their pages from shared buffers.
+ * This function is called on backend exit.
+ */
+static void
+TruncateSessionRelations(int code, Datum arg)
+{
+	SessionRelation* rel;
+	for (rel = SessionRelations; rel != NULL; rel = rel->next)
+	{
+		/* Delete relation files */
+		mdunlink(rel->rnode, InvalidForkNumber, false);
+	}
+}
+
+/*
+ * Maintain information about session relations accessed by this backend.
+ * This list is needed to perform cleanup on backend exit.
+ * Session relation is linked in this list when this relation is created or opened and file doesn't exist.
+ * Such procedure guarantee that each relation is linked into list only once.
+ */
+static void
+RegisterSessionRelation(SMgrRelation reln)
+{
+	SessionRelation* rel = (SessionRelation*)MemoryContextAlloc(TopMemoryContext, sizeof(SessionRelation));
+
+	/*
+	 * Perform session relation cleanup on backend exit. We are using shared memory hook, because
+	 * cleanup should be performed before backend is disconnected from shared memory.
+	 */
+	if (SessionRelations == NULL)
+		on_shmem_exit(TruncateSessionRelations, 0);
+
+	rel->rnode = reln->smgr_rnode;
+	rel->next = SessionRelations;
+	SessionRelations = rel;
+}
+
 /*
  *	mdexists() -- Does the physical file exist?
  *
@@ -218,6 +270,8 @@ mdcreate(SMgrRelation reln, ForkNumber forkNum, bool isRedo)
 					 errmsg("could not create file \"%s\": %m", path)));
 		}
 	}
+	if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		RegisterSessionRelation(reln);
 
 	pfree(path);
 
@@ -465,6 +519,19 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 
 	if (fd < 0)
 	{
+		/*
+		 * In case of session relation access, there may be no yet files of this relation for this backend.
+		 * If so, then create file and register session relation for truncation on backend exit.
+		 */
+		if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
+			fd = PathNameOpenFile(path, O_RDWR | PG_BINARY | O_CREAT);
+			if (fd >= 0)
+			{
+				RegisterSessionRelation(reln);
+				goto NewSegment;
+			}
+		}
 		if ((behavior & EXTENSION_RETURN_NULL) &&
 			FILE_POSSIBLY_DELETED(errno))
 		{
@@ -476,6 +543,7 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 				 errmsg("could not open file \"%s\": %m", path)));
 	}
 
+  NewSegment:
 	pfree(path);
 
 	_fdvec_resize(reln, forknum, 1);
@@ -652,8 +720,13 @@ mdread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
 		 * complaining.  This allows, for example, the case of trying to
 		 * update a block that was later truncated away.
 		 */
-		if (zero_damaged_pages || InRecovery)
+		if (zero_damaged_pages || InRecovery || RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
 			MemSet(buffer, 0, BLCKSZ);
+			/* In case of session relation we need to write zero page to provide correct result of subsequent mdnblocks */
+			if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+				mdwrite(reln, forknum, blocknum, buffer, true);
+		}
 		else
 			ereport(ERROR,
 					(errcode(ERRCODE_DATA_CORRUPTED),
@@ -738,12 +811,18 @@ mdwrite(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
 BlockNumber
 mdnblocks(SMgrRelation reln, ForkNumber forknum)
 {
-	MdfdVec    *v = mdopenfork(reln, forknum, EXTENSION_FAIL);
+	/*
+	 * If we access session relation, there may be no files yet of this relation for this backend.
+	 * Pass EXTENSION_RETURN_NULL to make mdopen return NULL in this case instead of reporting error.
+	 */
+	MdfdVec    *v = mdopenfork(reln, forknum, RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode)
+							   ? EXTENSION_RETURN_NULL : EXTENSION_FAIL);
 	BlockNumber nblocks;
 	BlockNumber segno = 0;
 
 	/* mdopen has opened the first segment */
-	Assert(reln->md_num_open_segs[forknum] > 0);
+	if (reln->md_num_open_segs[forknum] == 0)
+		return 0;
 
 	/*
 	 * Start from the last open segments, to avoid redundant seeks.  We have
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index a87e721..2401361 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -994,6 +994,9 @@ pg_relation_filepath(PG_FUNCTION_ARGS)
 	/* Determine owning backend. */
 	switch (relform->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c
index 2488607..86e8fca 100644
--- a/src/backend/utils/cache/relcache.c
+++ b/src/backend/utils/cache/relcache.c
@@ -1098,6 +1098,10 @@ RelationBuildDesc(Oid targetRelId, bool insertIt)
 	relation->rd_newRelfilenodeSubid = InvalidSubTransactionId;
 	switch (relation->rd_rel->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			relation->rd_backend = BackendIdForSessionRelations();
+			relation->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			relation->rd_backend = InvalidBackendId;
@@ -3301,6 +3305,10 @@ RelationBuildLocalRelation(const char *relname,
 	rel->rd_rel->relpersistence = relpersistence;
 	switch (relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			rel->rd_backend = BackendIdForSessionRelations();
+			rel->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			rel->rd_backend = InvalidBackendId;
diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
index 0cc9ede..1dff0c8 100644
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -15593,8 +15593,8 @@ dumpTableSchema(Archive *fout, TableInfo *tbinfo)
 											 tbinfo->dobj.catId.oid, false);
 
 		appendPQExpBuffer(q, "CREATE %s%s %s",
-						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ?
-						  "UNLOGGED " : "",
+						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ? "UNLOGGED "
+						  : tbinfo->relpersistence == RELPERSISTENCE_SESSION ? "SESSION " : "",
 						  reltypename,
 						  qualrelname);
 
diff --git a/src/common/relpath.c b/src/common/relpath.c
index 62b9553..cef99d2 100644
--- a/src/common/relpath.c
+++ b/src/common/relpath.c
@@ -166,7 +166,18 @@ GetRelationPath(Oid dbNode, Oid spcNode, Oid relNode,
 		}
 		else
 		{
-			if (forkNumber != MAIN_FORKNUM)
+			/*
+			 * Session relations are distinguished from local temp relations by adding
+			 * SessionRelFirstBackendId offset to backendId.
+			 * These is no need to separate them at file system level, so just subtract SessionRelFirstBackendId
+			 * to avoid too long file names.
+			 * Segments of session relations have the same prefix (t%d_) as local temporary relations
+			 * to make it possible to cleanup them in the same way as local temporary relation files.
+			 */
+			 if (backendId >= SessionRelFirstBackendId)
+				 backendId -= SessionRelFirstBackendId;
+
+			 if (forkNumber != MAIN_FORKNUM)
 				path = psprintf("base/%u/t%d_%u_%s",
 								dbNode, backendId, relNode,
 								forkNames[forkNumber]);
diff --git a/src/include/catalog/pg_class.h b/src/include/catalog/pg_class.h
index 090b6ba..6a39663 100644
--- a/src/include/catalog/pg_class.h
+++ b/src/include/catalog/pg_class.h
@@ -165,6 +165,7 @@ typedef FormData_pg_class *Form_pg_class;
 #define		  RELPERSISTENCE_PERMANENT	'p' /* regular table */
 #define		  RELPERSISTENCE_UNLOGGED	'u' /* unlogged permanent table */
 #define		  RELPERSISTENCE_TEMP		't' /* temporary table */
+#define		  RELPERSISTENCE_SESSION	's' /* session table */
 
 /* default selection for replica identity (primary key or nothing) */
 #define		  REPLICA_IDENTITY_DEFAULT	'd'
diff --git a/src/include/storage/backendid.h b/src/include/storage/backendid.h
index 70ef8eb..f226e7c 100644
--- a/src/include/storage/backendid.h
+++ b/src/include/storage/backendid.h
@@ -22,6 +22,13 @@ typedef int BackendId;			/* unique currently active backend identifier */
 
 #define InvalidBackendId		(-1)
 
+/*
+ * We need to distinguish local and global temporary relations by RelFileNodeBackend.
+ * The least invasive change is to add some special bias value to backend id (since 
+ * maximal number of backed is limited by MaxBackends).
+ */
+#define SessionRelFirstBackendId (0x40000000)
+
 extern PGDLLIMPORT BackendId MyBackendId;	/* backend id of this backend */
 
 /* backend id of our parallel session leader, or InvalidBackendId if none */
@@ -34,4 +41,10 @@ extern PGDLLIMPORT BackendId ParallelMasterBackendId;
 #define BackendIdForTempRelations() \
 	(ParallelMasterBackendId == InvalidBackendId ? MyBackendId : ParallelMasterBackendId)
 
+
+#define BackendIdForSessionRelations() \
+	(BackendIdForTempRelations() + SessionRelFirstBackendId)
+
+#define IsSessionRelationBackendId(id) ((id) >= SessionRelFirstBackendId)
+
 #endif							/* BACKENDID_H */
diff --git a/src/include/storage/bufpage.h b/src/include/storage/bufpage.h
index 4ef6d8d..bac7a31 100644
--- a/src/include/storage/bufpage.h
+++ b/src/include/storage/bufpage.h
@@ -229,6 +229,13 @@ typedef PageHeaderData *PageHeader;
 #define PageIsNew(page) (((PageHeader) (page))->pd_upper == 0)
 
 /*
+ * Page of temporary relation is not initialized
+ */
+#define GlobalTempRelationPageIsNotInitialized(rel, page) \
+	((rel)->rd_rel->relpersistence == RELPERSISTENCE_SESSION && PageIsNew(page))
+
+
+/*
  * PageGetItemId
  *		Returns an item identifier of a page.
  */
diff --git a/src/include/storage/relfilenode.h b/src/include/storage/relfilenode.h
index 586500a..20aec72 100644
--- a/src/include/storage/relfilenode.h
+++ b/src/include/storage/relfilenode.h
@@ -75,10 +75,25 @@ typedef struct RelFileNodeBackend
 	BackendId	backend;
 } RelFileNodeBackend;
 
+/*
+ * Check whether it is local or global temporary relation, which data belongs only to one backend.
+ */
 #define RelFileNodeBackendIsTemp(rnode) \
 	((rnode).backend != InvalidBackendId)
 
 /*
+ * Check whether it is global temporary relation which metadata is shared by all sessions,
+ * but data is private for the current session.
+ */
+#define RelFileNodeBackendIsGlobalTemp(rnode) IsSessionRelationBackendId((rnode).backend)
+
+/*
+ * Check whether it is local temporary relation which exists only in this backend.
+ */
+#define RelFileNodeBackendIsLocalTemp(rnode) \
+	(RelFileNodeBackendIsTemp(rnode) && !RelFileNodeBackendIsGlobalTemp(rnode))
+
+/*
  * Note: RelFileNodeEquals and RelFileNodeBackendEquals compare relNode first
  * since that is most likely to be different in two unequal RelFileNodes.  It
  * is probably redundant to compare spcNode if the other fields are found equal,
diff --git a/src/include/utils/rel.h b/src/include/utils/rel.h
index b0fe19e..dfa2044 100644
--- a/src/include/utils/rel.h
+++ b/src/include/utils/rel.h
@@ -328,6 +328,17 @@ typedef struct StdRdOptions
 	((relation)->rd_options ? \
 	 ((StdRdOptions *) (relation)->rd_options)->parallel_workers : (defaultpw))
 
+/*
+ * Relation persistence is either TEMP either SESSION
+ */
+#define IsLocalRelpersistence(relpersistence) \
+	((relpersistence) == RELPERSISTENCE_TEMP || (relpersistence) == RELPERSISTENCE_SESSION)
+
+/*
+ * Relation is either global either local temp table
+ */
+#define RelationHasSessionScope(relation) \
+	IsLocalRelpersistence(((relation)->rd_rel->relpersistence))
 
 /*
  * ViewOptions
@@ -524,7 +535,7 @@ typedef struct ViewOptions
  *		True if relation's pages are stored in local buffers.
  */
 #define RelationUsesLocalBuffers(relation) \
-	((relation)->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
+	RelationHasSessionScope(relation)
 
 /*
  * RELATION_IS_LOCAL
diff --git a/src/test/isolation/expected/inherit-global-temp.out b/src/test/isolation/expected/inherit-global-temp.out
new file mode 100644
index 0000000..6114f8c
--- /dev/null
+++ b/src/test/isolation/expected/inherit-global-temp.out
@@ -0,0 +1,218 @@
+Parsed test spec with 2 sessions
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_update_p s1_update_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_update_p: UPDATE inh_global_parent SET a = 11 WHERE a = 1;
+step s1_update_c: UPDATE inh_global_parent SET a = 13 WHERE a IN (3, 5);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+2              
+11             
+4              
+13             
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+4              
+13             
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+2              
+11             
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_update_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_update_c: UPDATE inh_global_parent SET a = 15 WHERE a IN (3, 5);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+6              
+15             
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+6              
+15             
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_delete_p s1_delete_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_delete_p: DELETE FROM inh_global_parent WHERE a = 2;
+step s1_delete_c: DELETE FROM inh_global_parent WHERE a IN (4, 6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+3              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_delete_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_delete_c: DELETE FROM inh_global_parent WHERE a IN (4, 6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+5              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_truncate_p s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_truncate_p s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_truncate_p: TRUNCATE inh_global_parent;
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_begin s1_truncate_p s2_select_p s1_commit
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_begin: BEGIN;
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s2_select_p: SELECT a FROM inh_global_parent; <waiting ...>
+step s1_commit: COMMIT;
+step s2_select_p: <... completed>
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_begin s1_truncate_p s2_select_c s1_commit
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_begin: BEGIN;
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2; <waiting ...>
+step s1_commit: COMMIT;
+step s2_select_c: <... completed>
+a              
+
+5              
+6              
diff --git a/src/test/isolation/isolation_schedule b/src/test/isolation/isolation_schedule
index 69ae227..95919f8 100644
--- a/src/test/isolation/isolation_schedule
+++ b/src/test/isolation/isolation_schedule
@@ -87,3 +87,4 @@ test: plpgsql-toast
 test: truncate-conflict
 test: serializable-parallel
 test: serializable-parallel-2
+test: inherit-global-temp
diff --git a/src/test/isolation/specs/inherit-global-temp.spec b/src/test/isolation/specs/inherit-global-temp.spec
new file mode 100644
index 0000000..5e95dd6
--- /dev/null
+++ b/src/test/isolation/specs/inherit-global-temp.spec
@@ -0,0 +1,73 @@
+# This is a copy of the inherit-temp test with little changes for global temporary tables.
+#
+
+setup
+{
+  CREATE TABLE inh_global_parent (a int);
+}
+
+teardown
+{
+  DROP TABLE inh_global_parent;
+}
+
+# Session 1 executes actions which act directly on both the parent and
+# its child.  Abbreviation "c" is used for queries working on the child
+# and "p" on the parent.
+session "s1"
+setup
+{
+  CREATE GLOBAL TEMPORARY TABLE inh_global_temp_child_s1 () INHERITS (inh_global_parent);
+}
+step "s1_begin" { BEGIN; }
+step "s1_truncate_p" { TRUNCATE inh_global_parent; }
+step "s1_select_p" { SELECT a FROM inh_global_parent; }
+step "s1_select_c" { SELECT a FROM inh_global_temp_child_s1; }
+step "s1_insert_p" { INSERT INTO inh_global_parent VALUES (1), (2); }
+step "s1_insert_c" { INSERT INTO inh_global_temp_child_s1 VALUES (3), (4); }
+step "s1_update_p" { UPDATE inh_global_parent SET a = 11 WHERE a = 1; }
+step "s1_update_c" { UPDATE inh_global_parent SET a = 13 WHERE a IN (3, 5); }
+step "s1_delete_p" { DELETE FROM inh_global_parent WHERE a = 2; }
+step "s1_delete_c" { DELETE FROM inh_global_parent WHERE a IN (4, 6); }
+step "s1_commit" { COMMIT; }
+teardown
+{
+  DROP TABLE inh_global_temp_child_s1;
+}
+
+# Session 2 executes actions on the parent which act only on the child.
+session "s2"
+setup
+{
+  CREATE GLOBAL TEMPORARY TABLE inh_global_temp_child_s2 () INHERITS (inh_global_parent);
+}
+step "s2_truncate_p" { TRUNCATE inh_global_parent; }
+step "s2_select_p" { SELECT a FROM inh_global_parent; }
+step "s2_select_c" { SELECT a FROM inh_global_temp_child_s2; }
+step "s2_insert_c" { INSERT INTO inh_global_temp_child_s2 VALUES (5), (6); }
+step "s2_update_c" { UPDATE inh_global_parent SET a = 15 WHERE a IN (3, 5); }
+step "s2_delete_c" { DELETE FROM inh_global_parent WHERE a IN (4, 6); }
+teardown
+{
+  DROP TABLE inh_global_temp_child_s2;
+}
+
+# Check INSERT behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check UPDATE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_update_p" "s1_update_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_update_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check DELETE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_delete_p" "s1_delete_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_delete_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check TRUNCATE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_truncate_p" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_truncate_p" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# TRUNCATE on a parent tree does not block access to temporary child relation
+# of another session, and blocks when scanning the parent.
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_begin" "s1_truncate_p" "s2_select_p" "s1_commit"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_begin" "s1_truncate_p" "s2_select_c" "s1_commit"
diff --git a/src/test/regress/expected/global_temp.out b/src/test/regress/expected/global_temp.out
new file mode 100644
index 0000000..ae1adb6
--- /dev/null
+++ b/src/test/regress/expected/global_temp.out
@@ -0,0 +1,247 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+-- Test ON COMMIT DELETE ROWS
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+   2
+(2 rows)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+(1 row)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+ col 
+-----
+   1
+(1 row)
+
+SELECT * FROM global_temptest2;
+ col 
+-----
+(0 rows)
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+ERROR:  unsupported ON COMMIT and foreign key combination
+DETAIL:  Table "global_temptest4" references "global_temptest3", but they do not have the same ON COMMIT setting.
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+ a 
+---
+(0 rows)
+
+DROP TABLE temp_parted_oncommit;
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+              relname              
+-----------------------------------
+ global_temp_parted_oncommit_test
+ global_temp_parted_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_parted_oncommit_test;
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+            relname             
+--------------------------------
+ global_temp_inh_oncommit_test
+ global_temp_inh_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ERROR:  cannot inherit from temporary relation "global_temp_table"
+ROLLBACK;
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM global_temp_table;
+ a 
+---
+ 1
+(1 row)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+(2 rows)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       1
+(1 row)
+
+\c
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+(0 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       2
+(1 row)
+
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       3
+(1 row)
+
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
diff --git a/src/test/regress/expected/session_table.out b/src/test/regress/expected/session_table.out
new file mode 100644
index 0000000..1b9b3f4
--- /dev/null
+++ b/src/test/regress/expected/session_table.out
@@ -0,0 +1,64 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+ count 
+-------
+ 10000
+(1 row)
+
+\c
+select count(*) from my_private_table;
+ count 
+-------
+     0
+(1 row)
+
+select * from my_private_table where x=10001;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select * from my_private_table where y=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select count(*) from my_private_table;
+ count  
+--------
+ 100000
+(1 row)
+
+\c
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+   x    |   y    
+--------+--------
+ 100000 | 100000
+(1 row)
+
+drop table  my_private_table;
diff --git a/src/test/regress/parallel_schedule b/src/test/regress/parallel_schedule
index fc0f141..507cf7d 100644
--- a/src/test/regress/parallel_schedule
+++ b/src/test/regress/parallel_schedule
@@ -107,7 +107,7 @@ test: json jsonb json_encoding jsonpath jsonpath_encoding jsonb_jsonpath
 # NB: temp.sql does a reconnect which transiently uses 2 connections,
 # so keep this parallel group to at most 19 tests
 # ----------
-test: plancache limit plpgsql copy2 temp domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
+test: plancache limit plpgsql copy2 temp global_temp session_table domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
 
 # ----------
 # Another group of parallel tests
diff --git a/src/test/regress/serial_schedule b/src/test/regress/serial_schedule
index 68ac56a..3890777 100644
--- a/src/test/regress/serial_schedule
+++ b/src/test/regress/serial_schedule
@@ -172,6 +172,8 @@ test: limit
 test: plpgsql
 test: copy2
 test: temp
+test: global_temp
+test: session_table
 test: domain
 test: rangefuncs
 test: prepare
diff --git a/src/test/regress/sql/global_temp.sql b/src/test/regress/sql/global_temp.sql
new file mode 100644
index 0000000..3058b9b
--- /dev/null
+++ b/src/test/regress/sql/global_temp.sql
@@ -0,0 +1,151 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+
+-- Test ON COMMIT DELETE ROWS
+
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+SELECT * FROM global_temptest2;
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+DROP TABLE temp_parted_oncommit;
+
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+DROP TABLE global_temp_parted_oncommit_test;
+
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ROLLBACK;
+
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+COMMIT;
+SELECT * FROM global_temp_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+COMMIT;
+SELECT * FROM normal_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+\c
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
diff --git a/src/test/regress/sql/session_table.sql b/src/test/regress/sql/session_table.sql
new file mode 100644
index 0000000..c6663dc
--- /dev/null
+++ b/src/test/regress/sql/session_table.sql
@@ -0,0 +1,18 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+\c
+select count(*) from my_private_table;
+select * from my_private_table where x=10001;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+select * from my_private_table where y=10001;
+select count(*) from my_private_table;
+\c
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+drop table  my_private_table;

diff --git a/src/backend/access/gist/gistutil.c b/src/backend/access/gist/gistutil.c
index 9726020..c99701d 100644
--- a/src/backend/access/gist/gistutil.c
+++ b/src/backend/access/gist/gistutil.c
@@ -1028,7 +1028,7 @@ gistGetFakeLSN(Relation rel)
 {
 	static XLogRecPtr counter = FirstNormalUnloggedLSN;
 
-	if (rel->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
+	if (RelationHasSessionScope(rel))
 	{
 		/*
 		 * Temporary relations are only accessible in our session, so a simple
diff --git a/src/backend/access/heap/heapam_handler.c b/src/backend/access/heap/heapam_handler.c
index f1ff01e..e92d324 100644
--- a/src/backend/access/heap/heapam_handler.c
+++ b/src/backend/access/heap/heapam_handler.c
@@ -673,6 +673,7 @@ heapam_relation_copy_data(Relation rel, const RelFileNode *newrnode)
 			 * init fork of an unlogged relation.
 			 */
 			if (rel->rd_rel->relpersistence == RELPERSISTENCE_PERMANENT ||
+				rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ||
 				(rel->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED &&
 				 forkNum == INIT_FORKNUM))
 				log_smgrcreate(newrnode, forkNum);
diff --git a/src/backend/access/nbtree/nbtpage.c b/src/backend/access/nbtree/nbtpage.c
index 9c1f7de..97cc9e4 100644
--- a/src/backend/access/nbtree/nbtpage.c
+++ b/src/backend/access/nbtree/nbtpage.c
@@ -763,7 +763,11 @@ _bt_getbuf(Relation rel, BlockNumber blkno, int access)
 		/* Read an existing block of the relation */
 		buf = ReadBuffer(rel, blkno);
 		LockBuffer(buf, access);
-		_bt_checkpage(rel, buf);
+		/* Session temporary relation may be not yet initialized for this backend. */
+		if (blkno == BTREE_METAPAGE && GlobalTempRelationPageIsNotInitialized(rel, BufferGetPage(buf)))
+			_bt_initmetapage(BufferGetPage(buf), P_NONE, 0);
+		else
+			_bt_checkpage(rel, buf);
 	}
 	else
 	{
diff --git a/src/backend/access/transam/varsup.c b/src/backend/access/transam/varsup.c
index 5b759ec..fda7573 100644
--- a/src/backend/access/transam/varsup.c
+++ b/src/backend/access/transam/varsup.c
@@ -69,9 +69,10 @@ GetNewTransactionId(bool isSubXact)
 		return FullTransactionIdFromEpochAndXid(0, BootstrapTransactionId);
 	}
 
-	/* safety check, we should never get this far in a HS standby */
+	/* Make it possible to access global temporary tables at standby */
 	if (RecoveryInProgress())
-		elog(ERROR, "cannot assign TransactionIds during recovery");
+		return FullTransactionIdFromEpochAndXid(0, FrozenTransactionId);
+   	    /* elog(ERROR, "cannot assign TransactionIds during recovery"); */
 
 	LWLockAcquire(XidGenLock, LW_EXCLUSIVE);
 
diff --git a/src/backend/access/transam/xact.c b/src/backend/access/transam/xact.c
index 1bbaeee..9857f1c 100644
--- a/src/backend/access/transam/xact.c
+++ b/src/backend/access/transam/xact.c
@@ -1206,7 +1206,7 @@ static TransactionId
 RecordTransactionCommit(void)
 {
 	TransactionId xid = GetTopTransactionIdIfAny();
-	bool		markXidCommitted = TransactionIdIsValid(xid);
+	bool		markXidCommitted = TransactionIdIsNormal(xid);
 	TransactionId latestXid = InvalidTransactionId;
 	int			nrels;
 	RelFileNode *rels;
@@ -1624,7 +1624,7 @@ RecordTransactionAbort(bool isSubXact)
 	 * rels to delete (note that this routine is not responsible for actually
 	 * deleting 'em).  We cannot have any child XIDs, either.
 	 */
-	if (!TransactionIdIsValid(xid))
+	if (!TransactionIdIsNormal(xid))
 	{
 		/* Reset XactLastRecEnd until the next transaction writes something */
 		if (!isSubXact)
@@ -2991,6 +2991,9 @@ CommitTransactionCommand(void)
 			 * and then clean up.
 			 */
 		case TBLOCK_ABORT_PENDING:
+			if (GetCurrentTransactionIdIfAny() == FrozenTransactionId)
+				elog(FATAL, "Transaction is aborted at standby");
+
 			AbortTransaction();
 			CleanupTransaction();
 			s->blockState = TBLOCK_DEFAULT;
diff --git a/src/backend/catalog/catalog.c b/src/backend/catalog/catalog.c
index a065419..8814afb 100644
--- a/src/backend/catalog/catalog.c
+++ b/src/backend/catalog/catalog.c
@@ -409,6 +409,9 @@ GetNewRelFileNode(Oid reltablespace, Relation pg_class, char relpersistence)
 		case RELPERSISTENCE_TEMP:
 			backend = BackendIdForTempRelations();
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 3e1d406..aaa2c49 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3590,7 +3590,7 @@ reindex_relation(Oid relid, int flags, int options)
 		if (flags & REINDEX_REL_FORCE_INDEXES_UNLOGGED)
 			persistence = RELPERSISTENCE_UNLOGGED;
 		else if (flags & REINDEX_REL_FORCE_INDEXES_PERMANENT)
-			persistence = RELPERSISTENCE_PERMANENT;
+			persistence = rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ? RELPERSISTENCE_SESSION : RELPERSISTENCE_PERMANENT;
 		else
 			persistence = rel->rd_rel->relpersistence;
 
diff --git a/src/backend/catalog/storage.c b/src/backend/catalog/storage.c
index 3cc886f..a111ddc 100644
--- a/src/backend/catalog/storage.c
+++ b/src/backend/catalog/storage.c
@@ -93,6 +93,10 @@ RelationCreateStorage(RelFileNode rnode, char relpersistence)
 			backend = InvalidBackendId;
 			needs_wal = false;
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			needs_wal = false;
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
 			needs_wal = true;
diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index cedb4ee..d11c5b3 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -1400,7 +1400,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap,
 	 */
 	if (newrelpersistence == RELPERSISTENCE_UNLOGGED)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_UNLOGGED;
-	else if (newrelpersistence == RELPERSISTENCE_PERMANENT)
+	else if (newrelpersistence != RELPERSISTENCE_TEMP)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_PERMANENT;
 
 	/* Report that we are now reindexing relations */
diff --git a/src/backend/commands/sequence.c b/src/backend/commands/sequence.c
index 0960b33..6c3998f 100644
--- a/src/backend/commands/sequence.c
+++ b/src/backend/commands/sequence.c
@@ -94,7 +94,7 @@ static HTAB *seqhashtab = NULL; /* hash table for SeqTable items */
  */
 static SeqTableData *last_used_seq = NULL;
 
-static void fill_seq_with_data(Relation rel, HeapTuple tuple);
+static void fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf);
 static Relation lock_and_open_sequence(SeqTable seq);
 static void create_seq_hashtable(void);
 static void init_sequence(Oid relid, SeqTable *p_elm, Relation *p_rel);
@@ -222,7 +222,7 @@ DefineSequence(ParseState *pstate, CreateSeqStmt *seq)
 
 	/* now initialize the sequence's data */
 	tuple = heap_form_tuple(tupDesc, value, null);
-	fill_seq_with_data(rel, tuple);
+	fill_seq_with_data(rel, tuple, InvalidBuffer);
 
 	/* process OWNED BY if given */
 	if (owned_by)
@@ -327,7 +327,7 @@ ResetSequence(Oid seq_relid)
 	/*
 	 * Insert the modified tuple into the new storage file.
 	 */
-	fill_seq_with_data(seq_rel, tuple);
+	fill_seq_with_data(seq_rel, tuple, InvalidBuffer);
 
 	/* Clear local cache so that we don't think we have cached numbers */
 	/* Note that we do not change the currval() state */
@@ -340,18 +340,21 @@ ResetSequence(Oid seq_relid)
  * Initialize a sequence's relation with the specified tuple as content
  */
 static void
-fill_seq_with_data(Relation rel, HeapTuple tuple)
+fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf)
 {
-	Buffer		buf;
 	Page		page;
 	sequence_magic *sm;
 	OffsetNumber offnum;
+	bool lockBuffer = false;
 
 	/* Initialize first page of relation with special magic number */
 
-	buf = ReadBuffer(rel, P_NEW);
-	Assert(BufferGetBlockNumber(buf) == 0);
-
+	if (buf == InvalidBuffer)
+	{
+		buf = ReadBuffer(rel, P_NEW);
+		Assert(BufferGetBlockNumber(buf) == 0);
+		lockBuffer = true;
+	}
 	page = BufferGetPage(buf);
 
 	PageInit(page, BufferGetPageSize(buf), sizeof(sequence_magic));
@@ -360,7 +363,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	/* Now insert sequence tuple */
 
-	LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
+	if (lockBuffer)
+		LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
 
 	/*
 	 * Since VACUUM does not process sequences, we have to force the tuple to
@@ -410,7 +414,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	END_CRIT_SECTION();
 
-	UnlockReleaseBuffer(buf);
+	if (lockBuffer)
+		UnlockReleaseBuffer(buf);
 }
 
 /*
@@ -502,7 +507,7 @@ AlterSequence(ParseState *pstate, AlterSeqStmt *stmt)
 		/*
 		 * Insert the modified tuple into the new storage file.
 		 */
-		fill_seq_with_data(seqrel, newdatatuple);
+		fill_seq_with_data(seqrel, newdatatuple, InvalidBuffer);
 	}
 
 	/* process OWNED BY if given */
@@ -1178,6 +1183,17 @@ read_seq_tuple(Relation rel, Buffer *buf, HeapTuple seqdatatuple)
 	LockBuffer(*buf, BUFFER_LOCK_EXCLUSIVE);
 
 	page = BufferGetPage(*buf);
+	if (GlobalTempRelationPageIsNotInitialized(rel, page))
+	{
+		/* Initialize sequence for global temporary tables */
+		Datum		value[SEQ_COL_LASTCOL] = {0};
+		bool		null[SEQ_COL_LASTCOL] = {false};
+		HeapTuple tuple;
+		value[SEQ_COL_LASTVAL-1] = Int64GetDatumFast(1); /* start sequence with 1 */
+		tuple = heap_form_tuple(RelationGetDescr(rel), value, null);
+		fill_seq_with_data(rel, tuple, *buf);
+	}
+
 	sm = (sequence_magic *) PageGetSpecialPointer(page);
 
 	if (sm->magic != SEQ_MAGIC)
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index fb2be10..a31f775 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -586,7 +586,7 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 	 * Check consistency of arguments
 	 */
 	if (stmt->oncommit != ONCOMMIT_NOOP
-		&& stmt->relation->relpersistence != RELPERSISTENCE_TEMP)
+		&& !IsLocalRelpersistence(stmt->relation->relpersistence))
 		ereport(ERROR,
 				(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 				 errmsg("ON COMMIT can only be used on temporary tables")));
@@ -1772,7 +1772,8 @@ ExecuteTruncateGuts(List *explicit_rels, List *relids, List *relids_logged,
 		 * table or the current physical file to be thrown away anyway.
 		 */
 		if (rel->rd_createSubid == mySubid ||
-			rel->rd_newRelfilenodeSubid == mySubid)
+			rel->rd_newRelfilenodeSubid == mySubid ||
+			rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
 		{
 			/* Immediate, non-rollbackable truncation is OK */
 			heap_truncate_one_rel(rel);
@@ -7678,6 +7679,12 @@ ATAddForeignKeyConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
 						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 						 errmsg("constraints on unlogged tables may reference only permanent or unlogged tables")));
 			break;
+		case RELPERSISTENCE_SESSION:
+			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
+				ereport(ERROR,
+						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+						 errmsg("constraints on session tables may reference only session tables")));
+			break;
 		case RELPERSISTENCE_TEMP:
 			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_TEMP)
 				ereport(ERROR,
@@ -14082,6 +14089,13 @@ ATPrepChangePersistence(Relation rel, bool toLogged)
 							RelationGetRelationName(rel)),
 					 errtable(rel)));
 			break;
+		case RELPERSISTENCE_SESSION:
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+					 errmsg("cannot change logged status of session table \"%s\"",
+							RelationGetRelationName(rel)),
+					 errtable(rel)));
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			if (toLogged)
 				/* nothing to do */
@@ -14569,14 +14583,7 @@ PreCommit_on_commit_actions(void)
 				/* Do nothing (there shouldn't be such entries, actually) */
 				break;
 			case ONCOMMIT_DELETE_ROWS:
-
-				/*
-				 * If this transaction hasn't accessed any temporary
-				 * relations, we can skip truncating ON COMMIT DELETE ROWS
-				 * tables, as they must still be empty.
-				 */
-				if ((MyXactFlags & XACT_FLAGS_ACCESSEDTEMPNAMESPACE))
-					oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
+				oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
 				break;
 			case ONCOMMIT_DROP:
 				oids_to_drop = lappend_oid(oids_to_drop, oc->relid);
diff --git a/src/backend/executor/execMain.c b/src/backend/executor/execMain.c
index dbd7dd9..efe6f21 100644
--- a/src/backend/executor/execMain.c
+++ b/src/backend/executor/execMain.c
@@ -788,6 +788,9 @@ ExecCheckXactReadOnly(PlannedStmt *plannedstmt)
 		if (isTempNamespace(get_rel_namespace(rte->relid)))
 			continue;
 
+		if (get_rel_persistence(rte->relid) == RELPERSISTENCE_SESSION)
+			continue;
+
 		PreventCommandIfReadOnly(CreateCommandTag((Node *) plannedstmt));
 	}
 
diff --git a/src/backend/optimizer/util/plancat.c b/src/backend/optimizer/util/plancat.c
index 98e9948..1a9170b 100644
--- a/src/backend/optimizer/util/plancat.c
+++ b/src/backend/optimizer/util/plancat.c
@@ -124,7 +124,7 @@ get_relation_info(PlannerInfo *root, Oid relationObjectId, bool inhparent,
 	relation = table_open(relationObjectId, NoLock);
 
 	/* Temporary and unlogged relations are inaccessible during recovery. */
-	if (!RelationNeedsWAL(relation) && RecoveryInProgress())
+	if (!RelationNeedsWAL(relation) && RecoveryInProgress() && relation->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
 		ereport(ERROR,
 				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
 				 errmsg("cannot access temporary or unlogged relations during recovery")));
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index c97bb36..f9b2000 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -3265,20 +3265,11 @@ OptTemp:	TEMPORARY					{ $$ = RELPERSISTENCE_TEMP; }
 			| TEMP						{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMPORARY			{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMP				{ $$ = RELPERSISTENCE_TEMP; }
-			| GLOBAL TEMPORARY
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
-			| GLOBAL TEMP
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
+			| GLOBAL TEMPORARY          { $$ = RELPERSISTENCE_SESSION; }
+			| GLOBAL TEMP               { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION                   { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMPORARY         { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMP              { $$ = RELPERSISTENCE_SESSION; }
 			| UNLOGGED					{ $$ = RELPERSISTENCE_UNLOGGED; }
 			| /*EMPTY*/					{ $$ = RELPERSISTENCE_PERMANENT; }
 		;
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index 6e5768c..ea6989b 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -437,6 +437,14 @@ generateSerialExtraStmts(CreateStmtContext *cxt, ColumnDef *column,
 	seqstmt->options = seqoptions;
 
 	/*
+	 * Why we should not always use persistence of parent table?
+	 * Although it is prohibited to have unlogged sequences,
+	 * unlogged tables with SERIAL fields are accepted!
+	 */
+	if (cxt->relation->relpersistence != RELPERSISTENCE_UNLOGGED)
+		seqstmt->sequence->relpersistence = cxt->relation->relpersistence;
+
+	/*
 	 * If a sequence data type was specified, add it to the options.  Prepend
 	 * to the list rather than append; in case a user supplied their own AS
 	 * clause, the "redundant options" error will point to their occurrence,
diff --git a/src/backend/postmaster/autovacuum.c b/src/backend/postmaster/autovacuum.c
index 073f313..3383c35 100644
--- a/src/backend/postmaster/autovacuum.c
+++ b/src/backend/postmaster/autovacuum.c
@@ -2069,7 +2069,7 @@ do_autovacuum(void)
 		 * Check if it is a temp table (presumably, of some other backend's).
 		 * We cannot safely process other backends' temp tables.
 		 */
-		if (classForm->relpersistence == RELPERSISTENCE_TEMP)
+		if (IsLocalRelpersistence(classForm->relpersistence))
 		{
 			/*
 			 * We just ignore it if the owning backend is still active and
@@ -2154,7 +2154,7 @@ do_autovacuum(void)
 		/*
 		 * We cannot safely process other backends' temp tables, so skip 'em.
 		 */
-		if (classForm->relpersistence == RELPERSISTENCE_TEMP)
+		if (IsLocalRelpersistence(classForm->relpersistence))
 			continue;
 
 		relid = classForm->oid;
diff --git a/src/backend/storage/smgr/md.c b/src/backend/storage/smgr/md.c
index 07f3c93..5db79ec 100644
--- a/src/backend/storage/smgr/md.c
+++ b/src/backend/storage/smgr/md.c
@@ -33,6 +33,7 @@
 #include "postmaster/bgwriter.h"
 #include "storage/fd.h"
 #include "storage/bufmgr.h"
+#include "storage/ipc.h"
 #include "storage/md.h"
 #include "storage/relfilenode.h"
 #include "storage/smgr.h"
@@ -87,6 +88,18 @@ typedef struct _MdfdVec
 
 static MemoryContext MdCxt;		/* context for all MdfdVec objects */
 
+/*
+ * Structure used to collect information created by this backend.
+ * Data of this related should be deleted on backend exit.
+ */
+typedef struct SessionRelation
+{
+	RelFileNodeBackend rnode;
+	struct SessionRelation* next;
+} SessionRelation;
+
+
+static SessionRelation* SessionRelations;
 
 /* Populate a file tag describing an md.c segment file. */
 #define INIT_MD_FILETAG(a,xx_rnode,xx_forknum,xx_segno) \
@@ -152,6 +165,45 @@ mdinit(void)
 								  ALLOCSET_DEFAULT_SIZES);
 }
 
+
+/*
+ * Delete all data of session relations and remove their pages from shared buffers.
+ * This function is called on backend exit.
+ */
+static void
+TruncateSessionRelations(int code, Datum arg)
+{
+	SessionRelation* rel;
+	for (rel = SessionRelations; rel != NULL; rel = rel->next)
+	{
+		/* Delete relation files */
+		mdunlink(rel->rnode, InvalidForkNumber, false);
+	}
+}
+
+/*
+ * Maintain information about session relations accessed by this backend.
+ * This list is needed to perform cleanup on backend exit.
+ * Session relation is linked in this list when this relation is created or opened and file doesn't exist.
+ * Such procedure guarantee that each relation is linked into list only once.
+ */
+static void
+RegisterSessionRelation(SMgrRelation reln)
+{
+	SessionRelation* rel = (SessionRelation*)MemoryContextAlloc(TopMemoryContext, sizeof(SessionRelation));
+
+	/*
+	 * Perform session relation cleanup on backend exit. We are using shared memory hook, because
+	 * cleanup should be performed before backend is disconnected from shared memory.
+	 */
+	if (SessionRelations == NULL)
+		on_shmem_exit(TruncateSessionRelations, 0);
+
+	rel->rnode = reln->smgr_rnode;
+	rel->next = SessionRelations;
+	SessionRelations = rel;
+}
+
 /*
  *	mdexists() -- Does the physical file exist?
  *
@@ -218,6 +270,8 @@ mdcreate(SMgrRelation reln, ForkNumber forkNum, bool isRedo)
 					 errmsg("could not create file \"%s\": %m", path)));
 		}
 	}
+	if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		RegisterSessionRelation(reln);
 
 	pfree(path);
 
@@ -465,6 +519,19 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 
 	if (fd < 0)
 	{
+		/*
+		 * In case of session relation access, there may be no yet files of this relation for this backend.
+		 * If so, then create file and register session relation for truncation on backend exit.
+		 */
+		if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
+			fd = PathNameOpenFile(path, O_RDWR | PG_BINARY | O_CREAT);
+			if (fd >= 0)
+			{
+				RegisterSessionRelation(reln);
+				goto NewSegment;
+			}
+		}
 		if ((behavior & EXTENSION_RETURN_NULL) &&
 			FILE_POSSIBLY_DELETED(errno))
 		{
@@ -476,6 +543,7 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 				 errmsg("could not open file \"%s\": %m", path)));
 	}
 
+  NewSegment:
 	pfree(path);
 
 	_fdvec_resize(reln, forknum, 1);
@@ -652,8 +720,13 @@ mdread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
 		 * complaining.  This allows, for example, the case of trying to
 		 * update a block that was later truncated away.
 		 */
-		if (zero_damaged_pages || InRecovery)
+		if (zero_damaged_pages || InRecovery || RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
 			MemSet(buffer, 0, BLCKSZ);
+			/* In case of session relation we need to write zero page to provide correct result of subsequent mdnblocks */
+			if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+				mdwrite(reln, forknum, blocknum, buffer, true);
+		}
 		else
 			ereport(ERROR,
 					(errcode(ERRCODE_DATA_CORRUPTED),
@@ -738,12 +811,18 @@ mdwrite(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
 BlockNumber
 mdnblocks(SMgrRelation reln, ForkNumber forknum)
 {
-	MdfdVec    *v = mdopenfork(reln, forknum, EXTENSION_FAIL);
+	/*
+	 * If we access session relation, there may be no files yet of this relation for this backend.
+	 * Pass EXTENSION_RETURN_NULL to make mdopen return NULL in this case instead of reporting error.
+	 */
+	MdfdVec    *v = mdopenfork(reln, forknum, RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode)
+							   ? EXTENSION_RETURN_NULL : EXTENSION_FAIL);
 	BlockNumber nblocks;
 	BlockNumber segno = 0;
 
 	/* mdopen has opened the first segment */
-	Assert(reln->md_num_open_segs[forknum] > 0);
+	if (reln->md_num_open_segs[forknum] == 0)
+		return 0;
 
 	/*
 	 * Start from the last open segments, to avoid redundant seeks.  We have
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index a87e721..2401361 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -994,6 +994,9 @@ pg_relation_filepath(PG_FUNCTION_ARGS)
 	/* Determine owning backend. */
 	switch (relform->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c
index 2488607..86e8fca 100644
--- a/src/backend/utils/cache/relcache.c
+++ b/src/backend/utils/cache/relcache.c
@@ -1098,6 +1098,10 @@ RelationBuildDesc(Oid targetRelId, bool insertIt)
 	relation->rd_newRelfilenodeSubid = InvalidSubTransactionId;
 	switch (relation->rd_rel->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			relation->rd_backend = BackendIdForSessionRelations();
+			relation->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			relation->rd_backend = InvalidBackendId;
@@ -3301,6 +3305,10 @@ RelationBuildLocalRelation(const char *relname,
 	rel->rd_rel->relpersistence = relpersistence;
 	switch (relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			rel->rd_backend = BackendIdForSessionRelations();
+			rel->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			rel->rd_backend = InvalidBackendId;
diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
index 0cc9ede..1dff0c8 100644
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -15593,8 +15593,8 @@ dumpTableSchema(Archive *fout, TableInfo *tbinfo)
 											 tbinfo->dobj.catId.oid, false);
 
 		appendPQExpBuffer(q, "CREATE %s%s %s",
-						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ?
-						  "UNLOGGED " : "",
+						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ? "UNLOGGED "
+						  : tbinfo->relpersistence == RELPERSISTENCE_SESSION ? "SESSION " : "",
 						  reltypename,
 						  qualrelname);
 
diff --git a/src/common/relpath.c b/src/common/relpath.c
index 62b9553..cef99d2 100644
--- a/src/common/relpath.c
+++ b/src/common/relpath.c
@@ -166,7 +166,18 @@ GetRelationPath(Oid dbNode, Oid spcNode, Oid relNode,
 		}
 		else
 		{
-			if (forkNumber != MAIN_FORKNUM)
+			/*
+			 * Session relations are distinguished from local temp relations by adding
+			 * SessionRelFirstBackendId offset to backendId.
+			 * These is no need to separate them at file system level, so just subtract SessionRelFirstBackendId
+			 * to avoid too long file names.
+			 * Segments of session relations have the same prefix (t%d_) as local temporary relations
+			 * to make it possible to cleanup them in the same way as local temporary relation files.
+			 */
+			 if (backendId >= SessionRelFirstBackendId)
+				 backendId -= SessionRelFirstBackendId;
+
+			 if (forkNumber != MAIN_FORKNUM)
 				path = psprintf("base/%u/t%d_%u_%s",
 								dbNode, backendId, relNode,
 								forkNames[forkNumber]);
diff --git a/src/include/catalog/pg_class.h b/src/include/catalog/pg_class.h
index 090b6ba..6a39663 100644
--- a/src/include/catalog/pg_class.h
+++ b/src/include/catalog/pg_class.h
@@ -165,6 +165,7 @@ typedef FormData_pg_class *Form_pg_class;
 #define		  RELPERSISTENCE_PERMANENT	'p' /* regular table */
 #define		  RELPERSISTENCE_UNLOGGED	'u' /* unlogged permanent table */
 #define		  RELPERSISTENCE_TEMP		't' /* temporary table */
+#define		  RELPERSISTENCE_SESSION	's' /* session table */
 
 /* default selection for replica identity (primary key or nothing) */
 #define		  REPLICA_IDENTITY_DEFAULT	'd'
diff --git a/src/include/storage/backendid.h b/src/include/storage/backendid.h
index 70ef8eb..f226e7c 100644
--- a/src/include/storage/backendid.h
+++ b/src/include/storage/backendid.h
@@ -22,6 +22,13 @@ typedef int BackendId;			/* unique currently active backend identifier */
 
 #define InvalidBackendId		(-1)
 
+/*
+ * We need to distinguish local and global temporary relations by RelFileNodeBackend.
+ * The least invasive change is to add some special bias value to backend id (since 
+ * maximal number of backed is limited by MaxBackends).
+ */
+#define SessionRelFirstBackendId (0x40000000)
+
 extern PGDLLIMPORT BackendId MyBackendId;	/* backend id of this backend */
 
 /* backend id of our parallel session leader, or InvalidBackendId if none */
@@ -34,4 +41,10 @@ extern PGDLLIMPORT BackendId ParallelMasterBackendId;
 #define BackendIdForTempRelations() \
 	(ParallelMasterBackendId == InvalidBackendId ? MyBackendId : ParallelMasterBackendId)
 
+
+#define BackendIdForSessionRelations() \
+	(BackendIdForTempRelations() + SessionRelFirstBackendId)
+
+#define IsSessionRelationBackendId(id) ((id) >= SessionRelFirstBackendId)
+
 #endif							/* BACKENDID_H */
diff --git a/src/include/storage/bufpage.h b/src/include/storage/bufpage.h
index 4ef6d8d..bac7a31 100644
--- a/src/include/storage/bufpage.h
+++ b/src/include/storage/bufpage.h
@@ -229,6 +229,13 @@ typedef PageHeaderData *PageHeader;
 #define PageIsNew(page) (((PageHeader) (page))->pd_upper == 0)
 
 /*
+ * Page of temporary relation is not initialized
+ */
+#define GlobalTempRelationPageIsNotInitialized(rel, page) \
+	((rel)->rd_rel->relpersistence == RELPERSISTENCE_SESSION && PageIsNew(page))
+
+
+/*
  * PageGetItemId
  *		Returns an item identifier of a page.
  */
diff --git a/src/include/storage/relfilenode.h b/src/include/storage/relfilenode.h
index 586500a..20aec72 100644
--- a/src/include/storage/relfilenode.h
+++ b/src/include/storage/relfilenode.h
@@ -75,10 +75,25 @@ typedef struct RelFileNodeBackend
 	BackendId	backend;
 } RelFileNodeBackend;
 
+/*
+ * Check whether it is local or global temporary relation, which data belongs only to one backend.
+ */
 #define RelFileNodeBackendIsTemp(rnode) \
 	((rnode).backend != InvalidBackendId)
 
 /*
+ * Check whether it is global temporary relation which metadata is shared by all sessions,
+ * but data is private for the current session.
+ */
+#define RelFileNodeBackendIsGlobalTemp(rnode) IsSessionRelationBackendId((rnode).backend)
+
+/*
+ * Check whether it is local temporary relation which exists only in this backend.
+ */
+#define RelFileNodeBackendIsLocalTemp(rnode) \
+	(RelFileNodeBackendIsTemp(rnode) && !RelFileNodeBackendIsGlobalTemp(rnode))
+
+/*
  * Note: RelFileNodeEquals and RelFileNodeBackendEquals compare relNode first
  * since that is most likely to be different in two unequal RelFileNodes.  It
  * is probably redundant to compare spcNode if the other fields are found equal,
diff --git a/src/include/utils/rel.h b/src/include/utils/rel.h
index b0fe19e..dfa2044 100644
--- a/src/include/utils/rel.h
+++ b/src/include/utils/rel.h
@@ -328,6 +328,17 @@ typedef struct StdRdOptions
 	((relation)->rd_options ? \
 	 ((StdRdOptions *) (relation)->rd_options)->parallel_workers : (defaultpw))
 
+/*
+ * Relation persistence is either TEMP either SESSION
+ */
+#define IsLocalRelpersistence(relpersistence) \
+	((relpersistence) == RELPERSISTENCE_TEMP || (relpersistence) == RELPERSISTENCE_SESSION)
+
+/*
+ * Relation is either global either local temp table
+ */
+#define RelationHasSessionScope(relation) \
+	IsLocalRelpersistence(((relation)->rd_rel->relpersistence))
 
 /*
  * ViewOptions
@@ -524,7 +535,7 @@ typedef struct ViewOptions
  *		True if relation's pages are stored in local buffers.
  */
 #define RelationUsesLocalBuffers(relation) \
-	((relation)->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
+	RelationHasSessionScope(relation)
 
 /*
  * RELATION_IS_LOCAL
diff --git a/src/test/isolation/expected/inherit-global-temp.out b/src/test/isolation/expected/inherit-global-temp.out
new file mode 100644
index 0000000..6114f8c
--- /dev/null
+++ b/src/test/isolation/expected/inherit-global-temp.out
@@ -0,0 +1,218 @@
+Parsed test spec with 2 sessions
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_update_p s1_update_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_update_p: UPDATE inh_global_parent SET a = 11 WHERE a = 1;
+step s1_update_c: UPDATE inh_global_parent SET a = 13 WHERE a IN (3, 5);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+2              
+11             
+4              
+13             
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+4              
+13             
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+2              
+11             
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_update_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_update_c: UPDATE inh_global_parent SET a = 15 WHERE a IN (3, 5);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+6              
+15             
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+6              
+15             
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_delete_p s1_delete_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_delete_p: DELETE FROM inh_global_parent WHERE a = 2;
+step s1_delete_c: DELETE FROM inh_global_parent WHERE a IN (4, 6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+3              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_delete_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_delete_c: DELETE FROM inh_global_parent WHERE a IN (4, 6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+5              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_truncate_p s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_truncate_p s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_truncate_p: TRUNCATE inh_global_parent;
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_begin s1_truncate_p s2_select_p s1_commit
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_begin: BEGIN;
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s2_select_p: SELECT a FROM inh_global_parent; <waiting ...>
+step s1_commit: COMMIT;
+step s2_select_p: <... completed>
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_begin s1_truncate_p s2_select_c s1_commit
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_begin: BEGIN;
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2; <waiting ...>
+step s1_commit: COMMIT;
+step s2_select_c: <... completed>
+a              
+
+5              
+6              
diff --git a/src/test/isolation/isolation_schedule b/src/test/isolation/isolation_schedule
index 69ae227..95919f8 100644
--- a/src/test/isolation/isolation_schedule
+++ b/src/test/isolation/isolation_schedule
@@ -87,3 +87,4 @@ test: plpgsql-toast
 test: truncate-conflict
 test: serializable-parallel
 test: serializable-parallel-2
+test: inherit-global-temp
diff --git a/src/test/isolation/specs/inherit-global-temp.spec b/src/test/isolation/specs/inherit-global-temp.spec
new file mode 100644
index 0000000..5e95dd6
--- /dev/null
+++ b/src/test/isolation/specs/inherit-global-temp.spec
@@ -0,0 +1,73 @@
+# This is a copy of the inherit-temp test with little changes for global temporary tables.
+#
+
+setup
+{
+  CREATE TABLE inh_global_parent (a int);
+}
+
+teardown
+{
+  DROP TABLE inh_global_parent;
+}
+
+# Session 1 executes actions which act directly on both the parent and
+# its child.  Abbreviation "c" is used for queries working on the child
+# and "p" on the parent.
+session "s1"
+setup
+{
+  CREATE GLOBAL TEMPORARY TABLE inh_global_temp_child_s1 () INHERITS (inh_global_parent);
+}
+step "s1_begin" { BEGIN; }
+step "s1_truncate_p" { TRUNCATE inh_global_parent; }
+step "s1_select_p" { SELECT a FROM inh_global_parent; }
+step "s1_select_c" { SELECT a FROM inh_global_temp_child_s1; }
+step "s1_insert_p" { INSERT INTO inh_global_parent VALUES (1), (2); }
+step "s1_insert_c" { INSERT INTO inh_global_temp_child_s1 VALUES (3), (4); }
+step "s1_update_p" { UPDATE inh_global_parent SET a = 11 WHERE a = 1; }
+step "s1_update_c" { UPDATE inh_global_parent SET a = 13 WHERE a IN (3, 5); }
+step "s1_delete_p" { DELETE FROM inh_global_parent WHERE a = 2; }
+step "s1_delete_c" { DELETE FROM inh_global_parent WHERE a IN (4, 6); }
+step "s1_commit" { COMMIT; }
+teardown
+{
+  DROP TABLE inh_global_temp_child_s1;
+}
+
+# Session 2 executes actions on the parent which act only on the child.
+session "s2"
+setup
+{
+  CREATE GLOBAL TEMPORARY TABLE inh_global_temp_child_s2 () INHERITS (inh_global_parent);
+}
+step "s2_truncate_p" { TRUNCATE inh_global_parent; }
+step "s2_select_p" { SELECT a FROM inh_global_parent; }
+step "s2_select_c" { SELECT a FROM inh_global_temp_child_s2; }
+step "s2_insert_c" { INSERT INTO inh_global_temp_child_s2 VALUES (5), (6); }
+step "s2_update_c" { UPDATE inh_global_parent SET a = 15 WHERE a IN (3, 5); }
+step "s2_delete_c" { DELETE FROM inh_global_parent WHERE a IN (4, 6); }
+teardown
+{
+  DROP TABLE inh_global_temp_child_s2;
+}
+
+# Check INSERT behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check UPDATE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_update_p" "s1_update_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_update_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check DELETE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_delete_p" "s1_delete_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_delete_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check TRUNCATE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_truncate_p" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_truncate_p" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# TRUNCATE on a parent tree does not block access to temporary child relation
+# of another session, and blocks when scanning the parent.
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_begin" "s1_truncate_p" "s2_select_p" "s1_commit"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_begin" "s1_truncate_p" "s2_select_c" "s1_commit"
diff --git a/src/test/regress/expected/global_temp.out b/src/test/regress/expected/global_temp.out
new file mode 100644
index 0000000..ae1adb6
--- /dev/null
+++ b/src/test/regress/expected/global_temp.out
@@ -0,0 +1,247 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+-- Test ON COMMIT DELETE ROWS
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+   2
+(2 rows)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+(1 row)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+ col 
+-----
+   1
+(1 row)
+
+SELECT * FROM global_temptest2;
+ col 
+-----
+(0 rows)
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+ERROR:  unsupported ON COMMIT and foreign key combination
+DETAIL:  Table "global_temptest4" references "global_temptest3", but they do not have the same ON COMMIT setting.
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+ a 
+---
+(0 rows)
+
+DROP TABLE temp_parted_oncommit;
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+              relname              
+-----------------------------------
+ global_temp_parted_oncommit_test
+ global_temp_parted_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_parted_oncommit_test;
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+            relname             
+--------------------------------
+ global_temp_inh_oncommit_test
+ global_temp_inh_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ERROR:  cannot inherit from temporary relation "global_temp_table"
+ROLLBACK;
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM global_temp_table;
+ a 
+---
+ 1
+(1 row)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+(2 rows)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       1
+(1 row)
+
+\c
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+(0 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       2
+(1 row)
+
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       3
+(1 row)
+
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
diff --git a/src/test/regress/expected/session_table.out b/src/test/regress/expected/session_table.out
new file mode 100644
index 0000000..1b9b3f4
--- /dev/null
+++ b/src/test/regress/expected/session_table.out
@@ -0,0 +1,64 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+ count 
+-------
+ 10000
+(1 row)
+
+\c
+select count(*) from my_private_table;
+ count 
+-------
+     0
+(1 row)
+
+select * from my_private_table where x=10001;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select * from my_private_table where y=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select count(*) from my_private_table;
+ count  
+--------
+ 100000
+(1 row)
+
+\c
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+   x    |   y    
+--------+--------
+ 100000 | 100000
+(1 row)
+
+drop table  my_private_table;
diff --git a/src/test/regress/parallel_schedule b/src/test/regress/parallel_schedule
index fc0f141..507cf7d 100644
--- a/src/test/regress/parallel_schedule
+++ b/src/test/regress/parallel_schedule
@@ -107,7 +107,7 @@ test: json jsonb json_encoding jsonpath jsonpath_encoding jsonb_jsonpath
 # NB: temp.sql does a reconnect which transiently uses 2 connections,
 # so keep this parallel group to at most 19 tests
 # ----------
-test: plancache limit plpgsql copy2 temp domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
+test: plancache limit plpgsql copy2 temp global_temp session_table domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
 
 # ----------
 # Another group of parallel tests
diff --git a/src/test/regress/serial_schedule b/src/test/regress/serial_schedule
index 68ac56a..3890777 100644
--- a/src/test/regress/serial_schedule
+++ b/src/test/regress/serial_schedule
@@ -172,6 +172,8 @@ test: limit
 test: plpgsql
 test: copy2
 test: temp
+test: global_temp
+test: session_table
 test: domain
 test: rangefuncs
 test: prepare
diff --git a/src/test/regress/sql/global_temp.sql b/src/test/regress/sql/global_temp.sql
new file mode 100644
index 0000000..3058b9b
--- /dev/null
+++ b/src/test/regress/sql/global_temp.sql
@@ -0,0 +1,151 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+
+-- Test ON COMMIT DELETE ROWS
+
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+SELECT * FROM global_temptest2;
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+DROP TABLE temp_parted_oncommit;
+
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+DROP TABLE global_temp_parted_oncommit_test;
+
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ROLLBACK;
+
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+COMMIT;
+SELECT * FROM global_temp_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+COMMIT;
+SELECT * FROM normal_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+\c
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
diff --git a/src/test/regress/sql/session_table.sql b/src/test/regress/sql/session_table.sql
new file mode 100644
index 0000000..c6663dc
--- /dev/null
+++ b/src/test/regress/sql/session_table.sql
@@ -0,0 +1,18 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+\c
+select count(*) from my_private_table;
+select * from my_private_table where x=10001;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+select * from my_private_table where y=10001;
+select count(*) from my_private_table;
+\c
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+drop table  my_private_table;

diff --git a/contrib/pg_buffercache/pg_buffercache_pages.c b/contrib/pg_buffercache/pg_buffercache_pages.c
index 1bd579f..2d93f6f 100644
--- a/contrib/pg_buffercache/pg_buffercache_pages.c
+++ b/contrib/pg_buffercache/pg_buffercache_pages.c
@@ -153,9 +153,9 @@ pg_buffercache_pages(PG_FUNCTION_ARGS)
 			buf_state = LockBufHdr(bufHdr);
 
 			fctx->record[i].bufferid = BufferDescriptorGetBuffer(bufHdr);
-			fctx->record[i].relfilenode = bufHdr->tag.rnode.relNode;
-			fctx->record[i].reltablespace = bufHdr->tag.rnode.spcNode;
-			fctx->record[i].reldatabase = bufHdr->tag.rnode.dbNode;
+			fctx->record[i].relfilenode = bufHdr->tag.rnode.node.relNode;
+			fctx->record[i].reltablespace = bufHdr->tag.rnode.node.spcNode;
+			fctx->record[i].reldatabase = bufHdr->tag.rnode.node.dbNode;
 			fctx->record[i].forknum = bufHdr->tag.forkNum;
 			fctx->record[i].blocknum = bufHdr->tag.blockNum;
 			fctx->record[i].usagecount = BUF_STATE_GET_USAGECOUNT(buf_state);
diff --git a/contrib/pg_prewarm/autoprewarm.c b/contrib/pg_prewarm/autoprewarm.c
index 38ae240..8a04954 100644
--- a/contrib/pg_prewarm/autoprewarm.c
+++ b/contrib/pg_prewarm/autoprewarm.c
@@ -608,9 +608,9 @@ apw_dump_now(bool is_bgworker, bool dump_unlogged)
 		if (buf_state & BM_TAG_VALID &&
 			((buf_state & BM_PERMANENT) || dump_unlogged))
 		{
-			block_info_array[num_blocks].database = bufHdr->tag.rnode.dbNode;
-			block_info_array[num_blocks].tablespace = bufHdr->tag.rnode.spcNode;
-			block_info_array[num_blocks].filenode = bufHdr->tag.rnode.relNode;
+			block_info_array[num_blocks].database = bufHdr->tag.rnode.node.dbNode;
+			block_info_array[num_blocks].tablespace = bufHdr->tag.rnode.node.spcNode;
+			block_info_array[num_blocks].filenode = bufHdr->tag.rnode.node.relNode;
 			block_info_array[num_blocks].forknum = bufHdr->tag.forkNum;
 			block_info_array[num_blocks].blocknum = bufHdr->tag.blockNum;
 			++num_blocks;
diff --git a/contrib/pgrowlocks/pgrowlocks.c b/contrib/pgrowlocks/pgrowlocks.c
index a2c44a9..43b4c66 100644
--- a/contrib/pgrowlocks/pgrowlocks.c
+++ b/contrib/pgrowlocks/pgrowlocks.c
@@ -158,7 +158,8 @@ pgrowlocks(PG_FUNCTION_ARGS)
 		/* must hold a buffer lock to call HeapTupleSatisfiesUpdate */
 		LockBuffer(hscan->rs_cbuf, BUFFER_LOCK_SHARE);
 
-		htsu = HeapTupleSatisfiesUpdate(tuple,
+		htsu = HeapTupleSatisfiesUpdate(mydata->rel,
+										tuple,
 										GetCurrentCommandId(false),
 										hscan->rs_cbuf);
 		xmax = HeapTupleHeaderGetRawXmax(tuple->t_data);
diff --git a/contrib/pgstattuple/pgstattuple.c b/contrib/pgstattuple/pgstattuple.c
index 70af43e..9cce720 100644
--- a/contrib/pgstattuple/pgstattuple.c
+++ b/contrib/pgstattuple/pgstattuple.c
@@ -349,7 +349,7 @@ pgstat_heap(Relation rel, FunctionCallInfo fcinfo)
 		/* must hold a buffer lock to call HeapTupleSatisfiesVisibility */
 		LockBuffer(hscan->rs_cbuf, BUFFER_LOCK_SHARE);
 
-		if (HeapTupleSatisfiesVisibility(tuple, &SnapshotDirty, hscan->rs_cbuf))
+		if (HeapTupleSatisfiesVisibility(rel, tuple, &SnapshotDirty, hscan->rs_cbuf))
 		{
 			stat.tuple_len += tuple->t_len;
 			stat.tuple_count++;
diff --git a/src/backend/access/gin/ginxlog.c b/src/backend/access/gin/ginxlog.c
index c945b28..14d4e48 100644
--- a/src/backend/access/gin/ginxlog.c
+++ b/src/backend/access/gin/ginxlog.c
@@ -95,13 +95,13 @@ ginRedoInsertEntry(Buffer buffer, bool isLeaf, BlockNumber rightblkno, void *rda
 
 	if (PageAddItem(page, (Item) itup, IndexTupleSize(itup), offset, false, false) == InvalidOffsetNumber)
 	{
-		RelFileNode node;
+		RelFileNodeBackend rnode;
 		ForkNumber	forknum;
 		BlockNumber blknum;
 
-		BufferGetTag(buffer, &node, &forknum, &blknum);
+		BufferGetTag(buffer, &rnode, &forknum, &blknum);
 		elog(ERROR, "failed to add item to index page in %u/%u/%u",
-			 node.spcNode, node.dbNode, node.relNode);
+			 rnode.node.spcNode, rnode.node.dbNode, rnode.node.relNode);
 	}
 }
 
diff --git a/src/backend/access/gist/gistutil.c b/src/backend/access/gist/gistutil.c
index 9726020..c99701d 100644
--- a/src/backend/access/gist/gistutil.c
+++ b/src/backend/access/gist/gistutil.c
@@ -1028,7 +1028,7 @@ gistGetFakeLSN(Relation rel)
 {
 	static XLogRecPtr counter = FirstNormalUnloggedLSN;
 
-	if (rel->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
+	if (RelationHasSessionScope(rel))
 	{
 		/*
 		 * Temporary relations are only accessible in our session, so a simple
diff --git a/src/backend/access/heap/heapam.c b/src/backend/access/heap/heapam.c
index 9430994..181efde 100644
--- a/src/backend/access/heap/heapam.c
+++ b/src/backend/access/heap/heapam.c
@@ -444,7 +444,7 @@ heapgetpage(TableScanDesc sscan, BlockNumber page)
 			if (all_visible)
 				valid = true;
 			else
-				valid = HeapTupleSatisfiesVisibility(&loctup, snapshot, buffer);
+				valid = HeapTupleSatisfiesVisibility(scan->rs_base.rs_rd, &loctup, snapshot, buffer);
 
 			CheckForSerializableConflictOut(valid, scan->rs_base.rs_rd,
 											&loctup, buffer, snapshot);
@@ -664,7 +664,8 @@ heapgettup(HeapScanDesc scan,
 				/*
 				 * if current tuple qualifies, return it.
 				 */
-				valid = HeapTupleSatisfiesVisibility(tuple,
+				valid = HeapTupleSatisfiesVisibility(scan->rs_base.rs_rd,
+													 tuple,
 													 snapshot,
 													 scan->rs_cbuf);
 
@@ -1474,7 +1475,7 @@ heap_fetch(Relation relation,
 	/*
 	 * check tuple visibility, then release lock
 	 */
-	valid = HeapTupleSatisfiesVisibility(tuple, snapshot, buffer);
+	valid = HeapTupleSatisfiesVisibility(relation, tuple, snapshot, buffer);
 
 	if (valid)
 		PredicateLockTuple(relation, tuple, snapshot);
@@ -1612,7 +1613,7 @@ heap_hot_search_buffer(ItemPointer tid, Relation relation, Buffer buffer,
 			ItemPointerSet(&(heapTuple->t_self), BufferGetBlockNumber(buffer), offnum);
 
 			/* If it's visible per the snapshot, we must return it */
-			valid = HeapTupleSatisfiesVisibility(heapTuple, snapshot, buffer);
+			valid = HeapTupleSatisfiesVisibility(relation, heapTuple, snapshot, buffer);
 			CheckForSerializableConflictOut(valid, relation, heapTuple,
 											buffer, snapshot);
 			/* reset to original, non-redirected, tid */
@@ -1754,7 +1755,7 @@ heap_get_latest_tid(TableScanDesc sscan,
 		 * Check tuple visibility; if visible, set it as the new result
 		 * candidate.
 		 */
-		valid = HeapTupleSatisfiesVisibility(&tp, snapshot, buffer);
+		valid = HeapTupleSatisfiesVisibility(relation, &tp, snapshot, buffer);
 		CheckForSerializableConflictOut(valid, relation, &tp, buffer, snapshot);
 		if (valid)
 			*tid = ctid;
@@ -1851,6 +1852,14 @@ ReleaseBulkInsertStatePin(BulkInsertState bistate)
 }
 
 
+static TransactionId
+GetTransactionId(Relation relation)
+{
+	return relation->rd_rel->relpersistence == RELPERSISTENCE_SESSION && RecoveryInProgress()
+		? GetReplicaTransactionId()
+		: GetCurrentTransactionId();
+}
+
 /*
  *	heap_insert		- insert tuple into a heap
  *
@@ -1873,7 +1882,7 @@ void
 heap_insert(Relation relation, HeapTuple tup, CommandId cid,
 			int options, BulkInsertState bistate)
 {
-	TransactionId xid = GetCurrentTransactionId();
+	TransactionId xid = GetTransactionId(relation);
 	HeapTuple	heaptup;
 	Buffer		buffer;
 	Buffer		vmbuffer = InvalidBuffer;
@@ -2110,7 +2119,7 @@ void
 heap_multi_insert(Relation relation, TupleTableSlot **slots, int ntuples,
 				  CommandId cid, int options, BulkInsertState bistate)
 {
-	TransactionId xid = GetCurrentTransactionId();
+	TransactionId xid = GetTransactionId(relation);
 	HeapTuple  *heaptuples;
 	int			i;
 	int			ndone;
@@ -2449,7 +2458,7 @@ heap_delete(Relation relation, ItemPointer tid,
 			TM_FailureData *tmfd, bool changingPart)
 {
 	TM_Result	result;
-	TransactionId xid = GetCurrentTransactionId();
+	TransactionId xid = GetTransactionId(relation);
 	ItemId		lp;
 	HeapTupleData tp;
 	Page		page;
@@ -2514,7 +2523,7 @@ heap_delete(Relation relation, ItemPointer tid,
 	tp.t_self = *tid;
 
 l1:
-	result = HeapTupleSatisfiesUpdate(&tp, cid, buffer);
+	result = HeapTupleSatisfiesUpdate(relation, &tp, cid, buffer);
 
 	if (result == TM_Invisible)
 	{
@@ -2633,7 +2642,7 @@ l1:
 	if (crosscheck != InvalidSnapshot && result == TM_Ok)
 	{
 		/* Perform additional check for transaction-snapshot mode RI updates */
-		if (!HeapTupleSatisfiesVisibility(&tp, crosscheck, buffer))
+		if (!HeapTupleSatisfiesVisibility(relation, &tp, crosscheck, buffer))
 			result = TM_Updated;
 	}
 
@@ -2900,7 +2909,7 @@ heap_update(Relation relation, ItemPointer otid, HeapTuple newtup,
 			TM_FailureData *tmfd, LockTupleMode *lockmode)
 {
 	TM_Result	result;
-	TransactionId xid = GetCurrentTransactionId();
+	TransactionId xid = GetTransactionId(relation);
 	Bitmapset  *hot_attrs;
 	Bitmapset  *key_attrs;
 	Bitmapset  *id_attrs;
@@ -3070,7 +3079,7 @@ heap_update(Relation relation, ItemPointer otid, HeapTuple newtup,
 l2:
 	checked_lockers = false;
 	locker_remains = false;
-	result = HeapTupleSatisfiesUpdate(&oldtup, cid, buffer);
+	result = HeapTupleSatisfiesUpdate(relation, &oldtup, cid, buffer);
 
 	/* see below about the "no wait" case */
 	Assert(result != TM_BeingModified || wait);
@@ -3262,7 +3271,7 @@ l2:
 	if (crosscheck != InvalidSnapshot && result == TM_Ok)
 	{
 		/* Perform additional check for transaction-snapshot mode RI updates */
-		if (!HeapTupleSatisfiesVisibility(&oldtup, crosscheck, buffer))
+		if (!HeapTupleSatisfiesVisibility(relation, &oldtup, crosscheck, buffer))
 		{
 			result = TM_Updated;
 			Assert(!ItemPointerEquals(&oldtup.t_self, &oldtup.t_data->t_ctid));
@@ -4018,7 +4027,7 @@ heap_lock_tuple(Relation relation, HeapTuple tuple,
 	tuple->t_tableOid = RelationGetRelid(relation);
 
 l3:
-	result = HeapTupleSatisfiesUpdate(tuple, cid, *buffer);
+	result = HeapTupleSatisfiesUpdate(relation, tuple, cid, *buffer);
 
 	if (result == TM_Invisible)
 	{
@@ -4193,7 +4202,7 @@ l3:
 					TM_Result	res;
 
 					res = heap_lock_updated_tuple(relation, tuple, &t_ctid,
-												  GetCurrentTransactionId(),
+												  GetTransactionId(relation),
 												  mode);
 					if (res != TM_Ok)
 					{
@@ -4441,7 +4450,7 @@ l3:
 				TM_Result	res;
 
 				res = heap_lock_updated_tuple(relation, tuple, &t_ctid,
-											  GetCurrentTransactionId(),
+											  GetTransactionId(relation),
 											  mode);
 				if (res != TM_Ok)
 				{
@@ -4550,7 +4559,7 @@ failed:
 	 * state if multixact.c elogs.
 	 */
 	compute_new_xmax_infomask(xmax, old_infomask, tuple->t_data->t_infomask2,
-							  GetCurrentTransactionId(), mode, false,
+							  GetTransactionId(relation), mode, false,
 							  &xid, &new_infomask, &new_infomask2);
 
 	START_CRIT_SECTION();
@@ -5570,7 +5579,7 @@ heap_finish_speculative(Relation relation, ItemPointer tid)
 void
 heap_abort_speculative(Relation relation, ItemPointer tid)
 {
-	TransactionId xid = GetCurrentTransactionId();
+	TransactionId xid = GetTransactionId(relation);
 	ItemId		lp;
 	HeapTupleData tp;
 	Page		page;
diff --git a/src/backend/access/heap/heapam_handler.c b/src/backend/access/heap/heapam_handler.c
index 09bc6fe..a189834 100644
--- a/src/backend/access/heap/heapam_handler.c
+++ b/src/backend/access/heap/heapam_handler.c
@@ -226,7 +226,8 @@ heapam_tuple_satisfies_snapshot(Relation rel, TupleTableSlot *slot,
 	 * Caller should be holding pin, but not lock.
 	 */
 	LockBuffer(bslot->buffer, BUFFER_LOCK_SHARE);
-	res = HeapTupleSatisfiesVisibility(bslot->base.tuple, snapshot,
+
+	res = HeapTupleSatisfiesVisibility(rel, bslot->base.tuple, snapshot,
 									   bslot->buffer);
 	LockBuffer(bslot->buffer, BUFFER_LOCK_UNLOCK);
 
@@ -671,6 +672,7 @@ heapam_relation_copy_data(Relation rel, const RelFileNode *newrnode)
 			 * init fork of an unlogged relation.
 			 */
 			if (rel->rd_rel->relpersistence == RELPERSISTENCE_PERMANENT ||
+				rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ||
 				(rel->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED &&
 				 forkNum == INIT_FORKNUM))
 				log_smgrcreate(newrnode, forkNum);
@@ -2160,7 +2162,7 @@ heapam_scan_bitmap_next_block(TableScanDesc scan,
 			loctup.t_len = ItemIdGetLength(lp);
 			loctup.t_tableOid = scan->rs_rd->rd_id;
 			ItemPointerSet(&loctup.t_self, page, offnum);
-			valid = HeapTupleSatisfiesVisibility(&loctup, snapshot, buffer);
+			valid = HeapTupleSatisfiesVisibility(scan->rs_rd, &loctup, snapshot, buffer);
 			if (valid)
 			{
 				hscan->rs_vistuples[ntup++] = offnum;
@@ -2480,7 +2482,7 @@ SampleHeapTupleVisible(TableScanDesc scan, Buffer buffer,
 	else
 	{
 		/* Otherwise, we have to check the tuple individually. */
-		return HeapTupleSatisfiesVisibility(tuple, scan->rs_snapshot,
+		return HeapTupleSatisfiesVisibility(scan->rs_rd, tuple, scan->rs_snapshot,
 											buffer);
 	}
 }
diff --git a/src/backend/access/heap/heapam_visibility.c b/src/backend/access/heap/heapam_visibility.c
index 537e681..3076f6a 100644
--- a/src/backend/access/heap/heapam_visibility.c
+++ b/src/backend/access/heap/heapam_visibility.c
@@ -77,6 +77,7 @@
 #include "utils/combocid.h"
 #include "utils/snapmgr.h"
 
+static bool TempTupleSatisfiesVisibility(HeapTuple htup, CommandId curcid, Buffer buffer);
 
 /*
  * SetHintBits()
@@ -454,7 +455,7 @@ HeapTupleSatisfiesToast(HeapTuple htup, Snapshot snapshot,
  *	test for it themselves.)
  */
 TM_Result
-HeapTupleSatisfiesUpdate(HeapTuple htup, CommandId curcid,
+HeapTupleSatisfiesUpdate(Relation relation, HeapTuple htup, CommandId curcid,
 						 Buffer buffer)
 {
 	HeapTupleHeader tuple = htup->t_data;
@@ -462,6 +463,13 @@ HeapTupleSatisfiesUpdate(HeapTuple htup, CommandId curcid,
 	Assert(ItemPointerIsValid(&htup->t_self));
 	Assert(htup->t_tableOid != InvalidOid);
 
+	if (relation->rd_rel->relpersistence == RELPERSISTENCE_SESSION && RecoveryInProgress())
+	{
+		AccessTempRelationAtReplica = true;
+		return TempTupleSatisfiesVisibility(htup, curcid, buffer) ? TM_Ok : TM_Invisible;
+	}
+	AccessTempRelationAtReplica = false;
+
 	if (!HeapTupleHeaderXminCommitted(tuple))
 	{
 		if (HeapTupleHeaderXminInvalid(tuple))
@@ -1677,6 +1685,59 @@ HeapTupleSatisfiesHistoricMVCC(HeapTuple htup, Snapshot snapshot,
 }
 
 /*
+ * TempTupleSatisfiesVisibility
+ *		True iff global temp table tuple is visible for the current transaction.
+ *
+ * Temporary tables are visible only for current backend, so there is no need to
+ * handle cases with tuples committed by other backends. We only need to exclude
+ * modifications done by aborted transactions or after start of table scan.
+ *
+ */
+static bool
+TempTupleSatisfiesVisibility(HeapTuple htup, CommandId curcid, Buffer buffer)
+{
+	HeapTupleHeader tuple = htup->t_data;
+	TransactionId xmin;
+	TransactionId xmax;
+
+	Assert(ItemPointerIsValid(&htup->t_self));
+	Assert(htup->t_tableOid != InvalidOid);
+
+	if (HeapTupleHeaderXminInvalid(tuple))
+		return false;
+
+	xmin = HeapTupleHeaderGetRawXmin(tuple);
+
+	if (IsReplicaTransactionAborted(xmin))
+		return false;
+
+	if (IsReplicaCurrentTransactionId(xmin)
+		&& HeapTupleHeaderGetCmin(tuple) >= curcid)
+	{
+		return false;	/* inserted after scan started */
+	}
+
+	if (tuple->t_infomask & HEAP_XMAX_INVALID)	/* xid invalid */
+		return true;
+
+	if (HEAP_XMAX_IS_LOCKED_ONLY(tuple->t_infomask))	/* not deleter */
+		return true;
+
+	xmax = (tuple->t_infomask & HEAP_XMAX_IS_MULTI)
+	    ? HeapTupleGetUpdateXid(tuple)
+		: HeapTupleHeaderGetRawXmax(tuple);
+
+	if (IsReplicaTransactionAborted(xmax))
+		return true; /* updating subtransaction aborted */
+
+	if (!IsReplicaCurrentTransactionId(xmax))
+		return false; /* updating transaction committed */
+
+	return (HeapTupleHeaderGetCmax(tuple) >= curcid);	/* updated after scan started */
+}
+
+
+/*
  * HeapTupleSatisfiesVisibility
  *		True iff heap tuple satisfies a time qual.
  *
@@ -1687,8 +1748,15 @@ HeapTupleSatisfiesHistoricMVCC(HeapTuple htup, Snapshot snapshot,
  *	if so, the indicated buffer is marked dirty.
  */
 bool
-HeapTupleSatisfiesVisibility(HeapTuple tup, Snapshot snapshot, Buffer buffer)
+HeapTupleSatisfiesVisibility(Relation relation, HeapTuple tup, Snapshot snapshot, Buffer buffer)
 {
+	if (relation->rd_rel->relpersistence == RELPERSISTENCE_SESSION && RecoveryInProgress())
+	{
+		AccessTempRelationAtReplica = true;
+		return TempTupleSatisfiesVisibility(tup, snapshot->curcid, buffer);
+	}
+	AccessTempRelationAtReplica = false;
+
 	switch (snapshot->snapshot_type)
 	{
 		case SNAPSHOT_MVCC:
diff --git a/src/backend/access/nbtree/nbtpage.c b/src/backend/access/nbtree/nbtpage.c
index 5962126..bdb6c95 100644
--- a/src/backend/access/nbtree/nbtpage.c
+++ b/src/backend/access/nbtree/nbtpage.c
@@ -763,7 +763,11 @@ _bt_getbuf(Relation rel, BlockNumber blkno, int access)
 		/* Read an existing block of the relation */
 		buf = ReadBuffer(rel, blkno);
 		LockBuffer(buf, access);
-		_bt_checkpage(rel, buf);
+		/* Session temporary relation may be not yet initialized for this backend. */
+		if (blkno == BTREE_METAPAGE && GlobalTempRelationPageIsNotInitialized(rel, BufferGetPage(buf)))
+			_bt_initmetapage(BufferGetPage(buf), P_NONE, 0);
+		else
+			_bt_checkpage(rel, buf);
 	}
 	else
 	{
diff --git a/src/backend/access/transam/transam.c b/src/backend/access/transam/transam.c
index 365ddfb..bce9c4a 100644
--- a/src/backend/access/transam/transam.c
+++ b/src/backend/access/transam/transam.c
@@ -22,6 +22,7 @@
 #include "access/clog.h"
 #include "access/subtrans.h"
 #include "access/transam.h"
+#include "access/xact.h"
 #include "utils/snapmgr.h"
 
 /*
@@ -126,6 +127,9 @@ TransactionIdDidCommit(TransactionId transactionId)
 {
 	XidStatus	xidstatus;
 
+	if (AccessTempRelationAtReplica)
+		return !IsReplicaCurrentTransactionId(transactionId) && !IsReplicaTransactionAborted(transactionId);
+
 	xidstatus = TransactionLogFetch(transactionId);
 
 	/*
@@ -182,6 +186,9 @@ TransactionIdDidAbort(TransactionId transactionId)
 {
 	XidStatus	xidstatus;
 
+	if (AccessTempRelationAtReplica)
+		return IsReplicaTransactionAborted(transactionId);
+
 	xidstatus = TransactionLogFetch(transactionId);
 
 	/*
diff --git a/src/backend/access/transam/varsup.c b/src/backend/access/transam/varsup.c
index 5b759ec..388faae 100644
--- a/src/backend/access/transam/varsup.c
+++ b/src/backend/access/transam/varsup.c
@@ -71,7 +71,7 @@ GetNewTransactionId(bool isSubXact)
 
 	/* safety check, we should never get this far in a HS standby */
 	if (RecoveryInProgress())
-		elog(ERROR, "cannot assign TransactionIds during recovery");
+   	    elog(ERROR, "cannot assign TransactionIds during recovery");
 
 	LWLockAcquire(XidGenLock, LW_EXCLUSIVE);
 
diff --git a/src/backend/access/transam/xact.c b/src/backend/access/transam/xact.c
index 1bbaeee..ab1bef9 100644
--- a/src/backend/access/transam/xact.c
+++ b/src/backend/access/transam/xact.c
@@ -192,6 +192,7 @@ typedef struct TransactionStateData
 	int			parallelModeLevel;	/* Enter/ExitParallelMode counter */
 	bool		chain;			/* start a new block after this one */
 	struct TransactionStateData *parent;	/* back link to parent */
+	TransactionId replicaTransactionId;    /* pseudo XID for inserting data in global temp tables at replica */
 } TransactionStateData;
 
 typedef TransactionStateData *TransactionState;
@@ -286,6 +287,12 @@ typedef struct XactCallbackItem
 
 static XactCallbackItem *Xact_callbacks = NULL;
 
+static TransactionId replicaTransIdCount = FirstNormalTransactionId;
+static TransactionId replicaTopTransId;
+static Bitmapset*    replicaAbortedXids;
+
+bool AccessTempRelationAtReplica;
+
 /*
  * List of add-on start- and end-of-subxact callbacks
  */
@@ -443,6 +450,48 @@ GetCurrentTransactionIdIfAny(void)
 }
 
 /*
+ * Transactions at replica can update only global temporary tables.
+ * Them are assigned backend-local XIDs which are independent from normal XIDs received from primary node.
+ * So tuples of temporary tables at replica requires special visibility rules.
+ *
+ * XIDs for such transactions at replica are created on demand (when tuple of temp table is updated).
+ * XID wrap-around and adjusting XID horizon is not supported. So number of such transactions at replica is
+ * limited by 2^32 and require up to 2^29 in-memory bitmap for marking aborted transactions.
+  */
+TransactionId
+GetReplicaTransactionId(void)
+{
+	TransactionState s = CurrentTransactionState;
+	if (!TransactionIdIsValid(s->replicaTransactionId))
+		s->replicaTransactionId = ++replicaTransIdCount;
+	return s->replicaTransactionId;
+}
+
+/*
+ * At replica transaction can update only temporary tables
+ * and them are assigned special XIDs (not related with normal XIDs received from primary node).
+ * As far as we see only own transaction it is not necessary to mark committed transactions.
+ * Only marking aborted ones is enough. All transactions which are not marked as aborted are treated as
+ * committed or self in-progress transactions.
+ */
+bool
+IsReplicaTransactionAborted(TransactionId xid)
+{
+	return bms_is_member(xid, replicaAbortedXids);
+}
+
+/*
+ * As far as XIDs for transactions at replica are generated individually for each backends,
+ * we can check that XID belongs to the current transaction or any of its subtransactions by
+ * just comparing it with XID of top transaction.
+ */
+bool
+IsReplicaCurrentTransactionId(TransactionId xid)
+{
+	return xid > replicaTopTransId;
+}
+
+/*
  *	GetTopFullTransactionId
  *
  * This will return the FullTransactionId of the main transaction, assigning
@@ -855,6 +904,9 @@ TransactionIdIsCurrentTransactionId(TransactionId xid)
 {
 	TransactionState s;
 
+	if (AccessTempRelationAtReplica)
+		return IsReplicaCurrentTransactionId(xid);
+
 	/*
 	 * We always say that BootstrapTransactionId is "not my transaction ID"
 	 * even when it is (ie, during bootstrap).  Along with the fact that
@@ -1206,7 +1258,7 @@ static TransactionId
 RecordTransactionCommit(void)
 {
 	TransactionId xid = GetTopTransactionIdIfAny();
-	bool		markXidCommitted = TransactionIdIsValid(xid);
+	bool		markXidCommitted = TransactionIdIsNormal(xid);
 	TransactionId latestXid = InvalidTransactionId;
 	int			nrels;
 	RelFileNode *rels;
@@ -1624,7 +1676,7 @@ RecordTransactionAbort(bool isSubXact)
 	 * rels to delete (note that this routine is not responsible for actually
 	 * deleting 'em).  We cannot have any child XIDs, either.
 	 */
-	if (!TransactionIdIsValid(xid))
+	if (!TransactionIdIsNormal(xid))
 	{
 		/* Reset XactLastRecEnd until the next transaction writes something */
 		if (!isSubXact)
@@ -1892,6 +1944,8 @@ StartTransaction(void)
 	s = &TopTransactionStateData;
 	CurrentTransactionState = s;
 
+	replicaTopTransId = replicaTransIdCount;
+
 	Assert(!FullTransactionIdIsValid(XactTopFullTransactionId));
 
 	/* check the current transaction state */
@@ -1905,6 +1959,7 @@ StartTransaction(void)
 	 */
 	s->state = TRANS_START;
 	s->fullTransactionId = InvalidFullTransactionId;	/* until assigned */
+	s->replicaTransactionId = InvalidTransactionId;	/* until assigned */
 
 	/* Determine if statements are logged in this transaction */
 	xact_is_sampled = log_xact_sample_rate != 0 &&
@@ -2570,6 +2625,14 @@ AbortTransaction(void)
 	/* Prevent cancel/die interrupt while cleaning up */
 	HOLD_INTERRUPTS();
 
+	/* Mark transactions involved global temp table at replica as aborted */
+	if (TransactionIdIsValid(s->replicaTransactionId))
+	{
+		MemoryContext ctx = MemoryContextSwitchTo(TopMemoryContext);
+		replicaAbortedXids = bms_add_member(replicaAbortedXids, s->replicaTransactionId);
+		MemoryContextSwitchTo(ctx);
+	}
+
 	/* Make sure we have a valid memory context and resource owner */
 	AtAbort_Memory();
 	AtAbort_ResourceOwner();
@@ -2991,6 +3054,9 @@ CommitTransactionCommand(void)
 			 * and then clean up.
 			 */
 		case TBLOCK_ABORT_PENDING:
+			if (GetCurrentTransactionIdIfAny() == FrozenTransactionId)
+				elog(FATAL, "Transaction is aborted at standby");
+
 			AbortTransaction();
 			CleanupTransaction();
 			s->blockState = TBLOCK_DEFAULT;
@@ -4856,6 +4922,14 @@ AbortSubTransaction(void)
 	/* Prevent cancel/die interrupt while cleaning up */
 	HOLD_INTERRUPTS();
 
+	/* Mark transactions involved global temp table at replica as aborted */
+	if (TransactionIdIsValid(s->replicaTransactionId))
+	{
+		MemoryContext ctx = MemoryContextSwitchTo(TopMemoryContext);
+		replicaAbortedXids = bms_add_member(replicaAbortedXids, s->replicaTransactionId);
+		MemoryContextSwitchTo(ctx);
+	}
+
 	/* Make sure we have a valid memory context and resource owner */
 	AtSubAbort_Memory();
 	AtSubAbort_ResourceOwner();
diff --git a/src/backend/access/transam/xloginsert.c b/src/backend/access/transam/xloginsert.c
index 3ec67d4..edec8ca 100644
--- a/src/backend/access/transam/xloginsert.c
+++ b/src/backend/access/transam/xloginsert.c
@@ -213,6 +213,7 @@ void
 XLogRegisterBuffer(uint8 block_id, Buffer buffer, uint8 flags)
 {
 	registered_buffer *regbuf;
+	RelFileNodeBackend rnode;
 
 	/* NO_IMAGE doesn't make sense with FORCE_IMAGE */
 	Assert(!((flags & REGBUF_FORCE_IMAGE) && (flags & (REGBUF_NO_IMAGE))));
@@ -227,7 +228,8 @@ XLogRegisterBuffer(uint8 block_id, Buffer buffer, uint8 flags)
 
 	regbuf = &registered_buffers[block_id];
 
-	BufferGetTag(buffer, &regbuf->rnode, &regbuf->forkno, &regbuf->block);
+	BufferGetTag(buffer, &rnode, &regbuf->forkno, &regbuf->block);
+	regbuf->rnode = rnode.node;
 	regbuf->page = BufferGetPage(buffer);
 	regbuf->flags = flags;
 	regbuf->rdata_tail = (XLogRecData *) &regbuf->rdata_head;
@@ -919,7 +921,7 @@ XLogSaveBufferForHint(Buffer buffer, bool buffer_std)
 		int			flags;
 		PGAlignedBlock copied_buffer;
 		char	   *origdata = (char *) BufferGetBlock(buffer);
-		RelFileNode rnode;
+		RelFileNodeBackend rnode;
 		ForkNumber	forkno;
 		BlockNumber blkno;
 
@@ -948,7 +950,7 @@ XLogSaveBufferForHint(Buffer buffer, bool buffer_std)
 			flags |= REGBUF_STANDARD;
 
 		BufferGetTag(buffer, &rnode, &forkno, &blkno);
-		XLogRegisterBlock(0, &rnode, forkno, blkno, copied_buffer.data, flags);
+		XLogRegisterBlock(0, &rnode.node, forkno, blkno, copied_buffer.data, flags);
 
 		recptr = XLogInsert(RM_XLOG_ID, XLOG_FPI_FOR_HINT);
 	}
@@ -1009,7 +1011,7 @@ XLogRecPtr
 log_newpage_buffer(Buffer buffer, bool page_std)
 {
 	Page		page = BufferGetPage(buffer);
-	RelFileNode rnode;
+	RelFileNodeBackend rnode;
 	ForkNumber	forkNum;
 	BlockNumber blkno;
 
@@ -1018,7 +1020,7 @@ log_newpage_buffer(Buffer buffer, bool page_std)
 
 	BufferGetTag(buffer, &rnode, &forkNum, &blkno);
 
-	return log_newpage(&rnode, forkNum, blkno, page, page_std);
+	return log_newpage(&rnode.node, forkNum, blkno, page, page_std);
 }
 
 /*
diff --git a/src/backend/catalog/catalog.c b/src/backend/catalog/catalog.c
index a065419..8814afb 100644
--- a/src/backend/catalog/catalog.c
+++ b/src/backend/catalog/catalog.c
@@ -409,6 +409,9 @@ GetNewRelFileNode(Oid reltablespace, Relation pg_class, char relpersistence)
 		case RELPERSISTENCE_TEMP:
 			backend = BackendIdForTempRelations();
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 99ae159..24b2438 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3612,7 +3612,7 @@ reindex_relation(Oid relid, int flags, int options)
 		if (flags & REINDEX_REL_FORCE_INDEXES_UNLOGGED)
 			persistence = RELPERSISTENCE_UNLOGGED;
 		else if (flags & REINDEX_REL_FORCE_INDEXES_PERMANENT)
-			persistence = RELPERSISTENCE_PERMANENT;
+			persistence = rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ? RELPERSISTENCE_SESSION : RELPERSISTENCE_PERMANENT;
 		else
 			persistence = rel->rd_rel->relpersistence;
 
diff --git a/src/backend/catalog/storage.c b/src/backend/catalog/storage.c
index 3cc886f..a111ddc 100644
--- a/src/backend/catalog/storage.c
+++ b/src/backend/catalog/storage.c
@@ -93,6 +93,10 @@ RelationCreateStorage(RelFileNode rnode, char relpersistence)
 			backend = InvalidBackendId;
 			needs_wal = false;
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			needs_wal = false;
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
 			needs_wal = true;
diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index cedb4ee..d11c5b3 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -1400,7 +1400,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap,
 	 */
 	if (newrelpersistence == RELPERSISTENCE_UNLOGGED)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_UNLOGGED;
-	else if (newrelpersistence == RELPERSISTENCE_PERMANENT)
+	else if (newrelpersistence != RELPERSISTENCE_TEMP)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_PERMANENT;
 
 	/* Report that we are now reindexing relations */
diff --git a/src/backend/commands/sequence.c b/src/backend/commands/sequence.c
index 0960b33..6c3998f 100644
--- a/src/backend/commands/sequence.c
+++ b/src/backend/commands/sequence.c
@@ -94,7 +94,7 @@ static HTAB *seqhashtab = NULL; /* hash table for SeqTable items */
  */
 static SeqTableData *last_used_seq = NULL;
 
-static void fill_seq_with_data(Relation rel, HeapTuple tuple);
+static void fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf);
 static Relation lock_and_open_sequence(SeqTable seq);
 static void create_seq_hashtable(void);
 static void init_sequence(Oid relid, SeqTable *p_elm, Relation *p_rel);
@@ -222,7 +222,7 @@ DefineSequence(ParseState *pstate, CreateSeqStmt *seq)
 
 	/* now initialize the sequence's data */
 	tuple = heap_form_tuple(tupDesc, value, null);
-	fill_seq_with_data(rel, tuple);
+	fill_seq_with_data(rel, tuple, InvalidBuffer);
 
 	/* process OWNED BY if given */
 	if (owned_by)
@@ -327,7 +327,7 @@ ResetSequence(Oid seq_relid)
 	/*
 	 * Insert the modified tuple into the new storage file.
 	 */
-	fill_seq_with_data(seq_rel, tuple);
+	fill_seq_with_data(seq_rel, tuple, InvalidBuffer);
 
 	/* Clear local cache so that we don't think we have cached numbers */
 	/* Note that we do not change the currval() state */
@@ -340,18 +340,21 @@ ResetSequence(Oid seq_relid)
  * Initialize a sequence's relation with the specified tuple as content
  */
 static void
-fill_seq_with_data(Relation rel, HeapTuple tuple)
+fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf)
 {
-	Buffer		buf;
 	Page		page;
 	sequence_magic *sm;
 	OffsetNumber offnum;
+	bool lockBuffer = false;
 
 	/* Initialize first page of relation with special magic number */
 
-	buf = ReadBuffer(rel, P_NEW);
-	Assert(BufferGetBlockNumber(buf) == 0);
-
+	if (buf == InvalidBuffer)
+	{
+		buf = ReadBuffer(rel, P_NEW);
+		Assert(BufferGetBlockNumber(buf) == 0);
+		lockBuffer = true;
+	}
 	page = BufferGetPage(buf);
 
 	PageInit(page, BufferGetPageSize(buf), sizeof(sequence_magic));
@@ -360,7 +363,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	/* Now insert sequence tuple */
 
-	LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
+	if (lockBuffer)
+		LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
 
 	/*
 	 * Since VACUUM does not process sequences, we have to force the tuple to
@@ -410,7 +414,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	END_CRIT_SECTION();
 
-	UnlockReleaseBuffer(buf);
+	if (lockBuffer)
+		UnlockReleaseBuffer(buf);
 }
 
 /*
@@ -502,7 +507,7 @@ AlterSequence(ParseState *pstate, AlterSeqStmt *stmt)
 		/*
 		 * Insert the modified tuple into the new storage file.
 		 */
-		fill_seq_with_data(seqrel, newdatatuple);
+		fill_seq_with_data(seqrel, newdatatuple, InvalidBuffer);
 	}
 
 	/* process OWNED BY if given */
@@ -1178,6 +1183,17 @@ read_seq_tuple(Relation rel, Buffer *buf, HeapTuple seqdatatuple)
 	LockBuffer(*buf, BUFFER_LOCK_EXCLUSIVE);
 
 	page = BufferGetPage(*buf);
+	if (GlobalTempRelationPageIsNotInitialized(rel, page))
+	{
+		/* Initialize sequence for global temporary tables */
+		Datum		value[SEQ_COL_LASTCOL] = {0};
+		bool		null[SEQ_COL_LASTCOL] = {false};
+		HeapTuple tuple;
+		value[SEQ_COL_LASTVAL-1] = Int64GetDatumFast(1); /* start sequence with 1 */
+		tuple = heap_form_tuple(RelationGetDescr(rel), value, null);
+		fill_seq_with_data(rel, tuple, *buf);
+	}
+
 	sm = (sequence_magic *) PageGetSpecialPointer(page);
 
 	if (sm->magic != SEQ_MAGIC)
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index fb2be10..a31f775 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -586,7 +586,7 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 	 * Check consistency of arguments
 	 */
 	if (stmt->oncommit != ONCOMMIT_NOOP
-		&& stmt->relation->relpersistence != RELPERSISTENCE_TEMP)
+		&& !IsLocalRelpersistence(stmt->relation->relpersistence))
 		ereport(ERROR,
 				(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 				 errmsg("ON COMMIT can only be used on temporary tables")));
@@ -1772,7 +1772,8 @@ ExecuteTruncateGuts(List *explicit_rels, List *relids, List *relids_logged,
 		 * table or the current physical file to be thrown away anyway.
 		 */
 		if (rel->rd_createSubid == mySubid ||
-			rel->rd_newRelfilenodeSubid == mySubid)
+			rel->rd_newRelfilenodeSubid == mySubid ||
+			rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
 		{
 			/* Immediate, non-rollbackable truncation is OK */
 			heap_truncate_one_rel(rel);
@@ -7678,6 +7679,12 @@ ATAddForeignKeyConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
 						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 						 errmsg("constraints on unlogged tables may reference only permanent or unlogged tables")));
 			break;
+		case RELPERSISTENCE_SESSION:
+			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
+				ereport(ERROR,
+						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+						 errmsg("constraints on session tables may reference only session tables")));
+			break;
 		case RELPERSISTENCE_TEMP:
 			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_TEMP)
 				ereport(ERROR,
@@ -14082,6 +14089,13 @@ ATPrepChangePersistence(Relation rel, bool toLogged)
 							RelationGetRelationName(rel)),
 					 errtable(rel)));
 			break;
+		case RELPERSISTENCE_SESSION:
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+					 errmsg("cannot change logged status of session table \"%s\"",
+							RelationGetRelationName(rel)),
+					 errtable(rel)));
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			if (toLogged)
 				/* nothing to do */
@@ -14569,14 +14583,7 @@ PreCommit_on_commit_actions(void)
 				/* Do nothing (there shouldn't be such entries, actually) */
 				break;
 			case ONCOMMIT_DELETE_ROWS:
-
-				/*
-				 * If this transaction hasn't accessed any temporary
-				 * relations, we can skip truncating ON COMMIT DELETE ROWS
-				 * tables, as they must still be empty.
-				 */
-				if ((MyXactFlags & XACT_FLAGS_ACCESSEDTEMPNAMESPACE))
-					oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
+				oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
 				break;
 			case ONCOMMIT_DROP:
 				oids_to_drop = lappend_oid(oids_to_drop, oc->relid);
diff --git a/src/backend/executor/execMain.c b/src/backend/executor/execMain.c
index dbd7dd9..efe6f21 100644
--- a/src/backend/executor/execMain.c
+++ b/src/backend/executor/execMain.c
@@ -788,6 +788,9 @@ ExecCheckXactReadOnly(PlannedStmt *plannedstmt)
 		if (isTempNamespace(get_rel_namespace(rte->relid)))
 			continue;
 
+		if (get_rel_persistence(rte->relid) == RELPERSISTENCE_SESSION)
+			continue;
+
 		PreventCommandIfReadOnly(CreateCommandTag((Node *) plannedstmt));
 	}
 
diff --git a/src/backend/optimizer/util/plancat.c b/src/backend/optimizer/util/plancat.c
index 98e9948..1a9170b 100644
--- a/src/backend/optimizer/util/plancat.c
+++ b/src/backend/optimizer/util/plancat.c
@@ -124,7 +124,7 @@ get_relation_info(PlannerInfo *root, Oid relationObjectId, bool inhparent,
 	relation = table_open(relationObjectId, NoLock);
 
 	/* Temporary and unlogged relations are inaccessible during recovery. */
-	if (!RelationNeedsWAL(relation) && RecoveryInProgress())
+	if (!RelationNeedsWAL(relation) && RecoveryInProgress() && relation->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
 		ereport(ERROR,
 				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
 				 errmsg("cannot access temporary or unlogged relations during recovery")));
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index c97bb36..f9b2000 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -3265,20 +3265,11 @@ OptTemp:	TEMPORARY					{ $$ = RELPERSISTENCE_TEMP; }
 			| TEMP						{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMPORARY			{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMP				{ $$ = RELPERSISTENCE_TEMP; }
-			| GLOBAL TEMPORARY
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
-			| GLOBAL TEMP
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
+			| GLOBAL TEMPORARY          { $$ = RELPERSISTENCE_SESSION; }
+			| GLOBAL TEMP               { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION                   { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMPORARY         { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMP              { $$ = RELPERSISTENCE_SESSION; }
 			| UNLOGGED					{ $$ = RELPERSISTENCE_UNLOGGED; }
 			| /*EMPTY*/					{ $$ = RELPERSISTENCE_PERMANENT; }
 		;
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index a9b2f8b..2f261b9 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -437,6 +437,14 @@ generateSerialExtraStmts(CreateStmtContext *cxt, ColumnDef *column,
 	seqstmt->options = seqoptions;
 
 	/*
+	 * Why we should not always use persistence of parent table?
+	 * Although it is prohibited to have unlogged sequences,
+	 * unlogged tables with SERIAL fields are accepted!
+	 */
+	if (cxt->relation->relpersistence != RELPERSISTENCE_UNLOGGED)
+		seqstmt->sequence->relpersistence = cxt->relation->relpersistence;
+
+	/*
 	 * If a sequence data type was specified, add it to the options.  Prepend
 	 * to the list rather than append; in case a user supplied their own AS
 	 * clause, the "redundant options" error will point to their occurrence,
diff --git a/src/backend/postmaster/autovacuum.c b/src/backend/postmaster/autovacuum.c
index 073f313..5760a9c 100644
--- a/src/backend/postmaster/autovacuum.c
+++ b/src/backend/postmaster/autovacuum.c
@@ -2154,7 +2154,7 @@ do_autovacuum(void)
 		/*
 		 * We cannot safely process other backends' temp tables, so skip 'em.
 		 */
-		if (classForm->relpersistence == RELPERSISTENCE_TEMP)
+		if (IsLocalRelpersistence(classForm->relpersistence))
 			continue;
 
 		relid = classForm->oid;
diff --git a/src/backend/replication/logical/reorderbuffer.c b/src/backend/replication/logical/reorderbuffer.c
index e8ffa04..2004d2f 100644
--- a/src/backend/replication/logical/reorderbuffer.c
+++ b/src/backend/replication/logical/reorderbuffer.c
@@ -3483,6 +3483,7 @@ ResolveCminCmaxDuringDecoding(HTAB *tuplecid_data,
 {
 	ReorderBufferTupleCidKey key;
 	ReorderBufferTupleCidEnt *ent;
+	RelFileNodeBackend rnode;
 	ForkNumber	forkno;
 	BlockNumber blockno;
 	bool		updated_mapping = false;
@@ -3496,7 +3497,8 @@ ResolveCminCmaxDuringDecoding(HTAB *tuplecid_data,
 	 * get relfilenode from the buffer, no convenient way to access it other
 	 * than that.
 	 */
-	BufferGetTag(buffer, &key.relnode, &forkno, &blockno);
+	BufferGetTag(buffer, &rnode, &forkno, &blockno);
+	key.relnode = rnode.node;
 
 	/* tuples can only be in the main fork */
 	Assert(forkno == MAIN_FORKNUM);
diff --git a/src/backend/storage/buffer/bufmgr.c b/src/backend/storage/buffer/bufmgr.c
index 6f3a402..76ce953 100644
--- a/src/backend/storage/buffer/bufmgr.c
+++ b/src/backend/storage/buffer/bufmgr.c
@@ -556,7 +556,7 @@ PrefetchBuffer(Relation reln, ForkNumber forkNum, BlockNumber blockNum)
 		int			buf_id;
 
 		/* create a tag so we can lookup the buffer */
-		INIT_BUFFERTAG(newTag, reln->rd_smgr->smgr_rnode.node,
+		INIT_BUFFERTAG(newTag, reln->rd_smgr->smgr_rnode,
 					   forkNum, blockNum);
 
 		/* determine its hash code and partition lock ID */
@@ -710,7 +710,7 @@ ReadBuffer_common(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
 	Block		bufBlock;
 	bool		found;
 	bool		isExtend;
-	bool		isLocalBuf = SmgrIsTemp(smgr);
+	bool		isLocalBuf = SmgrIsTemp(smgr) && relpersistence == RELPERSISTENCE_TEMP;
 
 	*hit = false;
 
@@ -1010,7 +1010,7 @@ BufferAlloc(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
 	uint32		buf_state;
 
 	/* create a tag so we can lookup the buffer */
-	INIT_BUFFERTAG(newTag, smgr->smgr_rnode.node, forkNum, blockNum);
+	INIT_BUFFERTAG(newTag, smgr->smgr_rnode, forkNum, blockNum);
 
 	/* determine its hash code and partition lock ID */
 	newHash = BufTableHashCode(&newTag);
@@ -1532,7 +1532,8 @@ ReleaseAndReadBuffer(Buffer buffer,
 		{
 			bufHdr = GetLocalBufferDescriptor(-buffer - 1);
 			if (bufHdr->tag.blockNum == blockNum &&
-				RelFileNodeEquals(bufHdr->tag.rnode, relation->rd_node) &&
+				RelFileNodeEquals(bufHdr->tag.rnode.node, relation->rd_node) &&
+				bufHdr->tag.rnode.backend == relation->rd_backend &&
 				bufHdr->tag.forkNum == forkNum)
 				return buffer;
 			ResourceOwnerForgetBuffer(CurrentResourceOwner, buffer);
@@ -1543,7 +1544,8 @@ ReleaseAndReadBuffer(Buffer buffer,
 			bufHdr = GetBufferDescriptor(buffer - 1);
 			/* we have pin, so it's ok to examine tag without spinlock */
 			if (bufHdr->tag.blockNum == blockNum &&
-				RelFileNodeEquals(bufHdr->tag.rnode, relation->rd_node) &&
+				RelFileNodeEquals(bufHdr->tag.rnode.node, relation->rd_node) &&
+				bufHdr->tag.rnode.backend == relation->rd_backend &&
 				bufHdr->tag.forkNum == forkNum)
 				return buffer;
 			UnpinBuffer(bufHdr, true);
@@ -1845,8 +1847,8 @@ BufferSync(int flags)
 
 			item = &CkptBufferIds[num_to_scan++];
 			item->buf_id = buf_id;
-			item->tsId = bufHdr->tag.rnode.spcNode;
-			item->relNode = bufHdr->tag.rnode.relNode;
+			item->tsId = bufHdr->tag.rnode.node.spcNode;
+			item->relNode = bufHdr->tag.rnode.node.relNode;
 			item->forkNum = bufHdr->tag.forkNum;
 			item->blockNum = bufHdr->tag.blockNum;
 		}
@@ -2559,7 +2561,7 @@ PrintBufferLeakWarning(Buffer buffer)
 	}
 
 	/* theoretically we should lock the bufhdr here */
-	path = relpathbackend(buf->tag.rnode, backend, buf->tag.forkNum);
+	path = relpathbackend(buf->tag.rnode.node, backend, buf->tag.forkNum);
 	buf_state = pg_atomic_read_u32(&buf->state);
 	elog(WARNING,
 		 "buffer refcount leak: [%03d] "
@@ -2631,7 +2633,7 @@ BufferGetBlockNumber(Buffer buffer)
  *		a buffer.
  */
 void
-BufferGetTag(Buffer buffer, RelFileNode *rnode, ForkNumber *forknum,
+BufferGetTag(Buffer buffer, RelFileNodeBackend *rnode, ForkNumber *forknum,
 			 BlockNumber *blknum)
 {
 	BufferDesc *bufHdr;
@@ -2696,7 +2698,7 @@ FlushBuffer(BufferDesc *buf, SMgrRelation reln)
 
 	/* Find smgr relation for buffer */
 	if (reln == NULL)
-		reln = smgropen(buf->tag.rnode, InvalidBackendId);
+		reln = smgropen(buf->tag.rnode.node, buf->tag.rnode.backend);
 
 	TRACE_POSTGRESQL_BUFFER_FLUSH_START(buf->tag.forkNum,
 										buf->tag.blockNum,
@@ -2930,7 +2932,7 @@ DropRelFileNodeBuffers(RelFileNodeBackend rnode, ForkNumber forkNum,
 	int			i;
 
 	/* If it's a local relation, it's localbuf.c's problem. */
-	if (RelFileNodeBackendIsTemp(rnode))
+	if (RelFileNodeBackendIsLocalTemp(rnode))
 	{
 		if (rnode.backend == MyBackendId)
 			DropRelFileNodeLocalBuffers(rnode.node, forkNum, firstDelBlock);
@@ -2958,11 +2960,11 @@ DropRelFileNodeBuffers(RelFileNodeBackend rnode, ForkNumber forkNum,
 		 * We could check forkNum and blockNum as well as the rnode, but the
 		 * incremental win from doing so seems small.
 		 */
-		if (!RelFileNodeEquals(bufHdr->tag.rnode, rnode.node))
+		if (!RelFileNodeBackendEquals(bufHdr->tag.rnode, rnode))
 			continue;
 
 		buf_state = LockBufHdr(bufHdr);
-		if (RelFileNodeEquals(bufHdr->tag.rnode, rnode.node) &&
+		if (RelFileNodeBackendEquals(bufHdr->tag.rnode, rnode) &&
 			bufHdr->tag.forkNum == forkNum &&
 			bufHdr->tag.blockNum >= firstDelBlock)
 			InvalidateBuffer(bufHdr);	/* releases spinlock */
@@ -2985,24 +2987,24 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 {
 	int			i,
 				n = 0;
-	RelFileNode *nodes;
+	RelFileNodeBackend *nodes;
 	bool		use_bsearch;
 
 	if (nnodes == 0)
 		return;
 
-	nodes = palloc(sizeof(RelFileNode) * nnodes);	/* non-local relations */
+	nodes = palloc(sizeof(RelFileNodeBackend) * nnodes);	/* non-local relations */
 
 	/* If it's a local relation, it's localbuf.c's problem. */
 	for (i = 0; i < nnodes; i++)
 	{
-		if (RelFileNodeBackendIsTemp(rnodes[i]))
+		if (RelFileNodeBackendIsLocalTemp(rnodes[i]))
 		{
 			if (rnodes[i].backend == MyBackendId)
 				DropRelFileNodeAllLocalBuffers(rnodes[i].node);
 		}
 		else
-			nodes[n++] = rnodes[i].node;
+			nodes[n++] = rnodes[i];
 	}
 
 	/*
@@ -3025,11 +3027,11 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 
 	/* sort the list of rnodes if necessary */
 	if (use_bsearch)
-		pg_qsort(nodes, n, sizeof(RelFileNode), rnode_comparator);
+		pg_qsort(nodes, n, sizeof(RelFileNodeBackend), rnode_comparator);
 
 	for (i = 0; i < NBuffers; i++)
 	{
-		RelFileNode *rnode = NULL;
+		RelFileNodeBackend *rnode = NULL;
 		BufferDesc *bufHdr = GetBufferDescriptor(i);
 		uint32		buf_state;
 
@@ -3044,7 +3046,7 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 
 			for (j = 0; j < n; j++)
 			{
-				if (RelFileNodeEquals(bufHdr->tag.rnode, nodes[j]))
+				if (RelFileNodeBackendEquals(bufHdr->tag.rnode, nodes[j]))
 				{
 					rnode = &nodes[j];
 					break;
@@ -3054,7 +3056,7 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 		else
 		{
 			rnode = bsearch((const void *) &(bufHdr->tag.rnode),
-							nodes, n, sizeof(RelFileNode),
+							nodes, n, sizeof(RelFileNodeBackend),
 							rnode_comparator);
 		}
 
@@ -3063,7 +3065,7 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 			continue;
 
 		buf_state = LockBufHdr(bufHdr);
-		if (RelFileNodeEquals(bufHdr->tag.rnode, (*rnode)))
+		if (RelFileNodeBackendEquals(bufHdr->tag.rnode, (*rnode)))
 			InvalidateBuffer(bufHdr);	/* releases spinlock */
 		else
 			UnlockBufHdr(bufHdr, buf_state);
@@ -3102,11 +3104,11 @@ DropDatabaseBuffers(Oid dbid)
 		 * As in DropRelFileNodeBuffers, an unlocked precheck should be safe
 		 * and saves some cycles.
 		 */
-		if (bufHdr->tag.rnode.dbNode != dbid)
+		if (bufHdr->tag.rnode.node.dbNode != dbid)
 			continue;
 
 		buf_state = LockBufHdr(bufHdr);
-		if (bufHdr->tag.rnode.dbNode == dbid)
+		if (bufHdr->tag.rnode.node.dbNode == dbid)
 			InvalidateBuffer(bufHdr);	/* releases spinlock */
 		else
 			UnlockBufHdr(bufHdr, buf_state);
@@ -3136,7 +3138,7 @@ PrintBufferDescs(void)
 			 "[%02d] (freeNext=%d, rel=%s, "
 			 "blockNum=%u, flags=0x%x, refcount=%u %d)",
 			 i, buf->freeNext,
-			 relpathbackend(buf->tag.rnode, InvalidBackendId, buf->tag.forkNum),
+			 relpath(buf->tag.rnode, buf->tag.forkNum),
 			 buf->tag.blockNum, buf->flags,
 			 buf->refcount, GetPrivateRefCount(b));
 	}
@@ -3204,7 +3206,8 @@ FlushRelationBuffers(Relation rel)
 			uint32		buf_state;
 
 			bufHdr = GetLocalBufferDescriptor(i);
-			if (RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node) &&
+			if (RelFileNodeEquals(bufHdr->tag.rnode.node, rel->rd_node) &&
+				bufHdr->tag.rnode.backend == rel->rd_backend &&
 				((buf_state = pg_atomic_read_u32(&bufHdr->state)) &
 				 (BM_VALID | BM_DIRTY)) == (BM_VALID | BM_DIRTY))
 			{
@@ -3251,13 +3254,15 @@ FlushRelationBuffers(Relation rel)
 		 * As in DropRelFileNodeBuffers, an unlocked precheck should be safe
 		 * and saves some cycles.
 		 */
-		if (!RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node))
+		if (!RelFileNodeEquals(bufHdr->tag.rnode.node, rel->rd_node)
+			|| bufHdr->tag.rnode.backend != rel->rd_backend)
 			continue;
 
 		ReservePrivateRefCountEntry();
 
 		buf_state = LockBufHdr(bufHdr);
-		if (RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node) &&
+		if (RelFileNodeEquals(bufHdr->tag.rnode.node, rel->rd_node) &&
+			bufHdr->tag.rnode.backend == rel->rd_backend &&
 			(buf_state & (BM_VALID | BM_DIRTY)) == (BM_VALID | BM_DIRTY))
 		{
 			PinBuffer_Locked(bufHdr);
@@ -3305,13 +3310,13 @@ FlushDatabaseBuffers(Oid dbid)
 		 * As in DropRelFileNodeBuffers, an unlocked precheck should be safe
 		 * and saves some cycles.
 		 */
-		if (bufHdr->tag.rnode.dbNode != dbid)
+		if (bufHdr->tag.rnode.node.dbNode != dbid)
 			continue;
 
 		ReservePrivateRefCountEntry();
 
 		buf_state = LockBufHdr(bufHdr);
-		if (bufHdr->tag.rnode.dbNode == dbid &&
+		if (bufHdr->tag.rnode.node.dbNode == dbid &&
 			(buf_state & (BM_VALID | BM_DIRTY)) == (BM_VALID | BM_DIRTY))
 		{
 			PinBuffer_Locked(bufHdr);
@@ -4051,7 +4056,7 @@ AbortBufferIO(void)
 				/* Buffer is pinned, so we can read tag without spinlock */
 				char	   *path;
 
-				path = relpathperm(buf->tag.rnode, buf->tag.forkNum);
+				path = relpath(buf->tag.rnode, buf->tag.forkNum);
 				ereport(WARNING,
 						(errcode(ERRCODE_IO_ERROR),
 						 errmsg("could not write block %u of %s",
@@ -4075,7 +4080,7 @@ shared_buffer_write_error_callback(void *arg)
 	/* Buffer is pinned, so we can read the tag without locking the spinlock */
 	if (bufHdr != NULL)
 	{
-		char	   *path = relpathperm(bufHdr->tag.rnode, bufHdr->tag.forkNum);
+		char	   *path = relpath(bufHdr->tag.rnode, bufHdr->tag.forkNum);
 
 		errcontext("writing block %u of relation %s",
 				   bufHdr->tag.blockNum, path);
@@ -4093,7 +4098,7 @@ local_buffer_write_error_callback(void *arg)
 
 	if (bufHdr != NULL)
 	{
-		char	   *path = relpathbackend(bufHdr->tag.rnode, MyBackendId,
+		char	   *path = relpathbackend(bufHdr->tag.rnode.node, MyBackendId,
 										  bufHdr->tag.forkNum);
 
 		errcontext("writing block %u of relation %s",
@@ -4108,22 +4113,27 @@ local_buffer_write_error_callback(void *arg)
 static int
 rnode_comparator(const void *p1, const void *p2)
 {
-	RelFileNode n1 = *(const RelFileNode *) p1;
-	RelFileNode n2 = *(const RelFileNode *) p2;
+	RelFileNodeBackend n1 = *(const RelFileNodeBackend *) p1;
+	RelFileNodeBackend n2 = *(const RelFileNodeBackend *) p2;
 
-	if (n1.relNode < n2.relNode)
+	if (n1.node.relNode < n2.node.relNode)
 		return -1;
-	else if (n1.relNode > n2.relNode)
+	else if (n1.node.relNode > n2.node.relNode)
 		return 1;
 
-	if (n1.dbNode < n2.dbNode)
+	if (n1.node.dbNode < n2.node.dbNode)
 		return -1;
-	else if (n1.dbNode > n2.dbNode)
+	else if (n1.node.dbNode > n2.node.dbNode)
 		return 1;
 
-	if (n1.spcNode < n2.spcNode)
+	if (n1.node.spcNode < n2.node.spcNode)
 		return -1;
-	else if (n1.spcNode > n2.spcNode)
+	else if (n1.node.spcNode > n2.node.spcNode)
+		return 1;
+
+	if (n1.backend < n2.backend)
+		return -1;
+	else if (n1.backend > n2.backend)
 		return 1;
 	else
 		return 0;
@@ -4359,7 +4369,7 @@ IssuePendingWritebacks(WritebackContext *context)
 			next = &context->pending_writebacks[i + ahead + 1];
 
 			/* different file, stop */
-			if (!RelFileNodeEquals(cur->tag.rnode, next->tag.rnode) ||
+			if (!RelFileNodeBackendEquals(cur->tag.rnode, next->tag.rnode) ||
 				cur->tag.forkNum != next->tag.forkNum)
 				break;
 
@@ -4378,7 +4388,7 @@ IssuePendingWritebacks(WritebackContext *context)
 		i += ahead;
 
 		/* and finally tell the kernel to write the data to storage */
-		reln = smgropen(tag.rnode, InvalidBackendId);
+		reln = smgropen(tag.rnode.node, tag.rnode.backend);
 		smgrwriteback(reln, tag.forkNum, tag.blockNum, nblocks);
 	}
 
diff --git a/src/backend/storage/buffer/localbuf.c b/src/backend/storage/buffer/localbuf.c
index f5f6a29..6bd5ecb 100644
--- a/src/backend/storage/buffer/localbuf.c
+++ b/src/backend/storage/buffer/localbuf.c
@@ -68,7 +68,7 @@ LocalPrefetchBuffer(SMgrRelation smgr, ForkNumber forkNum,
 	BufferTag	newTag;			/* identity of requested block */
 	LocalBufferLookupEnt *hresult;
 
-	INIT_BUFFERTAG(newTag, smgr->smgr_rnode.node, forkNum, blockNum);
+	INIT_BUFFERTAG(newTag, smgr->smgr_rnode, forkNum, blockNum);
 
 	/* Initialize local buffers if first request in this session */
 	if (LocalBufHash == NULL)
@@ -111,7 +111,7 @@ LocalBufferAlloc(SMgrRelation smgr, ForkNumber forkNum, BlockNumber blockNum,
 	bool		found;
 	uint32		buf_state;
 
-	INIT_BUFFERTAG(newTag, smgr->smgr_rnode.node, forkNum, blockNum);
+	INIT_BUFFERTAG(newTag, smgr->smgr_rnode, forkNum, blockNum);
 
 	/* Initialize local buffers if first request in this session */
 	if (LocalBufHash == NULL)
@@ -209,7 +209,7 @@ LocalBufferAlloc(SMgrRelation smgr, ForkNumber forkNum, BlockNumber blockNum,
 		Page		localpage = (char *) LocalBufHdrGetBlock(bufHdr);
 
 		/* Find smgr relation for buffer */
-		oreln = smgropen(bufHdr->tag.rnode, MyBackendId);
+		oreln = smgropen(bufHdr->tag.rnode.node, MyBackendId);
 
 		PageSetChecksumInplace(localpage, bufHdr->tag.blockNum);
 
@@ -331,14 +331,14 @@ DropRelFileNodeLocalBuffers(RelFileNode rnode, ForkNumber forkNum,
 		buf_state = pg_atomic_read_u32(&bufHdr->state);
 
 		if ((buf_state & BM_TAG_VALID) &&
-			RelFileNodeEquals(bufHdr->tag.rnode, rnode) &&
+			RelFileNodeEquals(bufHdr->tag.rnode.node, rnode) &&
 			bufHdr->tag.forkNum == forkNum &&
 			bufHdr->tag.blockNum >= firstDelBlock)
 		{
 			if (LocalRefCount[i] != 0)
 				elog(ERROR, "block %u of %s is still referenced (local %u)",
 					 bufHdr->tag.blockNum,
-					 relpathbackend(bufHdr->tag.rnode, MyBackendId,
+					 relpathbackend(bufHdr->tag.rnode.node, MyBackendId,
 									bufHdr->tag.forkNum),
 					 LocalRefCount[i]);
 			/* Remove entry from hashtable */
@@ -377,12 +377,12 @@ DropRelFileNodeAllLocalBuffers(RelFileNode rnode)
 		buf_state = pg_atomic_read_u32(&bufHdr->state);
 
 		if ((buf_state & BM_TAG_VALID) &&
-			RelFileNodeEquals(bufHdr->tag.rnode, rnode))
+			RelFileNodeEquals(bufHdr->tag.rnode.node, rnode))
 		{
 			if (LocalRefCount[i] != 0)
 				elog(ERROR, "block %u of %s is still referenced (local %u)",
 					 bufHdr->tag.blockNum,
-					 relpathbackend(bufHdr->tag.rnode, MyBackendId,
+					 relpathbackend(bufHdr->tag.rnode.node, MyBackendId,
 									bufHdr->tag.forkNum),
 					 LocalRefCount[i]);
 			/* Remove entry from hashtable */
diff --git a/src/backend/storage/freespace/fsmpage.c b/src/backend/storage/freespace/fsmpage.c
index cf7f03f..65eb422 100644
--- a/src/backend/storage/freespace/fsmpage.c
+++ b/src/backend/storage/freespace/fsmpage.c
@@ -268,13 +268,13 @@ restart:
 			 *
 			 * Fix the corruption and restart.
 			 */
-			RelFileNode rnode;
+			RelFileNodeBackend rnode;
 			ForkNumber	forknum;
 			BlockNumber blknum;
 
 			BufferGetTag(buf, &rnode, &forknum, &blknum);
 			elog(DEBUG1, "fixing corrupt FSM block %u, relation %u/%u/%u",
-				 blknum, rnode.spcNode, rnode.dbNode, rnode.relNode);
+				 blknum, rnode.node.spcNode, rnode.node.dbNode, rnode.node.relNode);
 
 			/* make sure we hold an exclusive lock */
 			if (!exclusive_lock_held)
diff --git a/src/backend/storage/ipc/procarray.c b/src/backend/storage/ipc/procarray.c
index fadab62..055ec6b 100644
--- a/src/backend/storage/ipc/procarray.c
+++ b/src/backend/storage/ipc/procarray.c
@@ -994,6 +994,9 @@ TransactionIdIsInProgress(TransactionId xid)
 	int			i,
 				j;
 
+	if (AccessTempRelationAtReplica)
+		return IsReplicaCurrentTransactionId(xid) && !IsReplicaTransactionAborted(xid);
+
 	/*
 	 * Don't bother checking a transaction older than RecentXmin; it could not
 	 * possibly still be running.  (Note: in particular, this guarantees that
diff --git a/src/backend/storage/smgr/md.c b/src/backend/storage/smgr/md.c
index 07f3c93..204c4cb 100644
--- a/src/backend/storage/smgr/md.c
+++ b/src/backend/storage/smgr/md.c
@@ -33,6 +33,7 @@
 #include "postmaster/bgwriter.h"
 #include "storage/fd.h"
 #include "storage/bufmgr.h"
+#include "storage/ipc.h"
 #include "storage/md.h"
 #include "storage/relfilenode.h"
 #include "storage/smgr.h"
@@ -87,6 +88,18 @@ typedef struct _MdfdVec
 
 static MemoryContext MdCxt;		/* context for all MdfdVec objects */
 
+/*
+ * Structure used to collect information created by this backend.
+ * Data of this related should be deleted on backend exit.
+ */
+typedef struct SessionRelation
+{
+	RelFileNodeBackend rnode;
+	struct SessionRelation* next;
+} SessionRelation;
+
+
+static SessionRelation* SessionRelations;
 
 /* Populate a file tag describing an md.c segment file. */
 #define INIT_MD_FILETAG(a,xx_rnode,xx_forknum,xx_segno) \
@@ -152,6 +165,48 @@ mdinit(void)
 								  ALLOCSET_DEFAULT_SIZES);
 }
 
+
+/*
+ * Delete all data of session relations and remove their pages from shared buffers.
+ * This function is called on backend exit.
+ */
+static void
+TruncateSessionRelations(int code, Datum arg)
+{
+	SessionRelation* rel;
+	for (rel = SessionRelations; rel != NULL; rel = rel->next)
+	{
+		/* Remove relation pages from shared buffers */
+		DropRelFileNodesAllBuffers(&rel->rnode, 1);
+
+		/* Delete relation files */
+		mdunlink(rel->rnode, InvalidForkNumber, false);
+	}
+}
+
+/*
+ * Maintain information about session relations accessed by this backend.
+ * This list is needed to perform cleanup on backend exit.
+ * Session relation is linked in this list when this relation is created or opened and file doesn't exist.
+ * Such procedure guarantee that each relation is linked into list only once.
+ */
+static void
+RegisterSessionRelation(SMgrRelation reln)
+{
+	SessionRelation* rel = (SessionRelation*)MemoryContextAlloc(TopMemoryContext, sizeof(SessionRelation));
+
+	/*
+	 * Perform session relation cleanup on backend exit. We are using shared memory hook, because
+	 * cleanup should be performed before backend is disconnected from shared memory.
+	 */
+	if (SessionRelations == NULL)
+		on_shmem_exit(TruncateSessionRelations, 0);
+
+	rel->rnode = reln->smgr_rnode;
+	rel->next = SessionRelations;
+	SessionRelations = rel;
+}
+
 /*
  *	mdexists() -- Does the physical file exist?
  *
@@ -218,6 +273,8 @@ mdcreate(SMgrRelation reln, ForkNumber forkNum, bool isRedo)
 					 errmsg("could not create file \"%s\": %m", path)));
 		}
 	}
+	if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		RegisterSessionRelation(reln);
 
 	pfree(path);
 
@@ -465,6 +522,19 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 
 	if (fd < 0)
 	{
+		/*
+		 * In case of session relation access, there may be no yet files of this relation for this backend.
+		 * If so, then create file and register session relation for truncation on backend exit.
+		 */
+		if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
+			fd = PathNameOpenFile(path, O_RDWR | PG_BINARY | O_CREAT);
+			if (fd >= 0)
+			{
+				RegisterSessionRelation(reln);
+				goto NewSegment;
+			}
+		}
 		if ((behavior & EXTENSION_RETURN_NULL) &&
 			FILE_POSSIBLY_DELETED(errno))
 		{
@@ -476,6 +546,7 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 				 errmsg("could not open file \"%s\": %m", path)));
 	}
 
+  NewSegment:
 	pfree(path);
 
 	_fdvec_resize(reln, forknum, 1);
@@ -652,8 +723,13 @@ mdread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
 		 * complaining.  This allows, for example, the case of trying to
 		 * update a block that was later truncated away.
 		 */
-		if (zero_damaged_pages || InRecovery)
+		if (zero_damaged_pages || InRecovery || RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
 			MemSet(buffer, 0, BLCKSZ);
+			/* In case of session relation we need to write zero page to provide correct result of subsequent mdnblocks */
+			if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+				mdwrite(reln, forknum, blocknum, buffer, true);
+		}
 		else
 			ereport(ERROR,
 					(errcode(ERRCODE_DATA_CORRUPTED),
@@ -738,12 +814,18 @@ mdwrite(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
 BlockNumber
 mdnblocks(SMgrRelation reln, ForkNumber forknum)
 {
-	MdfdVec    *v = mdopenfork(reln, forknum, EXTENSION_FAIL);
+	/*
+	 * If we access session relation, there may be no files yet of this relation for this backend.
+	 * Pass EXTENSION_RETURN_NULL to make mdopen return NULL in this case instead of reporting error.
+	 */
+	MdfdVec    *v = mdopenfork(reln, forknum, RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode)
+							   ? EXTENSION_RETURN_NULL : EXTENSION_FAIL);
 	BlockNumber nblocks;
 	BlockNumber segno = 0;
 
 	/* mdopen has opened the first segment */
-	Assert(reln->md_num_open_segs[forknum] > 0);
+	if (reln->md_num_open_segs[forknum] == 0)
+		return 0;
 
 	/*
 	 * Start from the last open segments, to avoid redundant seeks.  We have
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index a87e721..2401361 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -994,6 +994,9 @@ pg_relation_filepath(PG_FUNCTION_ARGS)
 	/* Determine owning backend. */
 	switch (relform->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c
index 2488607..86e8fca 100644
--- a/src/backend/utils/cache/relcache.c
+++ b/src/backend/utils/cache/relcache.c
@@ -1098,6 +1098,10 @@ RelationBuildDesc(Oid targetRelId, bool insertIt)
 	relation->rd_newRelfilenodeSubid = InvalidSubTransactionId;
 	switch (relation->rd_rel->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			relation->rd_backend = BackendIdForSessionRelations();
+			relation->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			relation->rd_backend = InvalidBackendId;
@@ -3301,6 +3305,10 @@ RelationBuildLocalRelation(const char *relname,
 	rel->rd_rel->relpersistence = relpersistence;
 	switch (relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			rel->rd_backend = BackendIdForSessionRelations();
+			rel->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			rel->rd_backend = InvalidBackendId;
diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
index 0cc9ede..1dff0c8 100644
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -15593,8 +15593,8 @@ dumpTableSchema(Archive *fout, TableInfo *tbinfo)
 											 tbinfo->dobj.catId.oid, false);
 
 		appendPQExpBuffer(q, "CREATE %s%s %s",
-						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ?
-						  "UNLOGGED " : "",
+						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ? "UNLOGGED "
+						  : tbinfo->relpersistence == RELPERSISTENCE_SESSION ? "SESSION " : "",
 						  reltypename,
 						  qualrelname);
 
diff --git a/src/common/relpath.c b/src/common/relpath.c
index 62b9553..cef99d2 100644
--- a/src/common/relpath.c
+++ b/src/common/relpath.c
@@ -166,7 +166,18 @@ GetRelationPath(Oid dbNode, Oid spcNode, Oid relNode,
 		}
 		else
 		{
-			if (forkNumber != MAIN_FORKNUM)
+			/*
+			 * Session relations are distinguished from local temp relations by adding
+			 * SessionRelFirstBackendId offset to backendId.
+			 * These is no need to separate them at file system level, so just subtract SessionRelFirstBackendId
+			 * to avoid too long file names.
+			 * Segments of session relations have the same prefix (t%d_) as local temporary relations
+			 * to make it possible to cleanup them in the same way as local temporary relation files.
+			 */
+			 if (backendId >= SessionRelFirstBackendId)
+				 backendId -= SessionRelFirstBackendId;
+
+			 if (forkNumber != MAIN_FORKNUM)
 				path = psprintf("base/%u/t%d_%u_%s",
 								dbNode, backendId, relNode,
 								forkNames[forkNumber]);
diff --git a/src/include/access/heapam.h b/src/include/access/heapam.h
index 858bcb6..2f16c58 100644
--- a/src/include/access/heapam.h
+++ b/src/include/access/heapam.h
@@ -195,9 +195,9 @@ extern void heap_vacuum_rel(Relation onerel,
 							struct VacuumParams *params, BufferAccessStrategy bstrategy);
 
 /* in heap/heapam_visibility.c */
-extern bool HeapTupleSatisfiesVisibility(HeapTuple stup, Snapshot snapshot,
+extern bool HeapTupleSatisfiesVisibility(Relation relation, HeapTuple stup, Snapshot snapshot,
 										 Buffer buffer);
-extern TM_Result HeapTupleSatisfiesUpdate(HeapTuple stup, CommandId curcid,
+extern TM_Result HeapTupleSatisfiesUpdate(Relation relation, HeapTuple stup, CommandId curcid,
 										  Buffer buffer);
 extern HTSV_Result HeapTupleSatisfiesVacuum(HeapTuple stup, TransactionId OldestXmin,
 											Buffer buffer);
diff --git a/src/include/access/xact.h b/src/include/access/xact.h
index d714551..cbe6760 100644
--- a/src/include/access/xact.h
+++ b/src/include/access/xact.h
@@ -41,6 +41,9 @@
 extern int	DefaultXactIsoLevel;
 extern PGDLLIMPORT int XactIsoLevel;
 
+extern bool AccessTempRelationAtReplica;
+
+
 /*
  * We implement three isolation levels internally.
  * The two stronger ones use one snapshot per database transaction;
@@ -440,4 +443,8 @@ extern void EnterParallelMode(void);
 extern void ExitParallelMode(void);
 extern bool IsInParallelMode(void);
 
+extern TransactionId GetReplicaTransactionId(void);
+extern bool IsReplicaTransactionAborted(TransactionId xid);
+extern bool IsReplicaCurrentTransactionId(TransactionId xid);
+
 #endif							/* XACT_H */
diff --git a/src/include/catalog/pg_class.h b/src/include/catalog/pg_class.h
index 090b6ba..6a39663 100644
--- a/src/include/catalog/pg_class.h
+++ b/src/include/catalog/pg_class.h
@@ -165,6 +165,7 @@ typedef FormData_pg_class *Form_pg_class;
 #define		  RELPERSISTENCE_PERMANENT	'p' /* regular table */
 #define		  RELPERSISTENCE_UNLOGGED	'u' /* unlogged permanent table */
 #define		  RELPERSISTENCE_TEMP		't' /* temporary table */
+#define		  RELPERSISTENCE_SESSION	's' /* session table */
 
 /* default selection for replica identity (primary key or nothing) */
 #define		  REPLICA_IDENTITY_DEFAULT	'd'
diff --git a/src/include/storage/backendid.h b/src/include/storage/backendid.h
index 70ef8eb..f226e7c 100644
--- a/src/include/storage/backendid.h
+++ b/src/include/storage/backendid.h
@@ -22,6 +22,13 @@ typedef int BackendId;			/* unique currently active backend identifier */
 
 #define InvalidBackendId		(-1)
 
+/*
+ * We need to distinguish local and global temporary relations by RelFileNodeBackend.
+ * The least invasive change is to add some special bias value to backend id (since 
+ * maximal number of backed is limited by MaxBackends).
+ */
+#define SessionRelFirstBackendId (0x40000000)
+
 extern PGDLLIMPORT BackendId MyBackendId;	/* backend id of this backend */
 
 /* backend id of our parallel session leader, or InvalidBackendId if none */
@@ -34,4 +41,10 @@ extern PGDLLIMPORT BackendId ParallelMasterBackendId;
 #define BackendIdForTempRelations() \
 	(ParallelMasterBackendId == InvalidBackendId ? MyBackendId : ParallelMasterBackendId)
 
+
+#define BackendIdForSessionRelations() \
+	(BackendIdForTempRelations() + SessionRelFirstBackendId)
+
+#define IsSessionRelationBackendId(id) ((id) >= SessionRelFirstBackendId)
+
 #endif							/* BACKENDID_H */
diff --git a/src/include/storage/buf_internals.h b/src/include/storage/buf_internals.h
index df2dda7..7adb96b 100644
--- a/src/include/storage/buf_internals.h
+++ b/src/include/storage/buf_internals.h
@@ -90,16 +90,17 @@
  */
 typedef struct buftag
 {
-	RelFileNode rnode;			/* physical relation identifier */
+	RelFileNodeBackend rnode;			/* physical relation identifier */
 	ForkNumber	forkNum;
 	BlockNumber blockNum;		/* blknum relative to begin of reln */
 } BufferTag;
 
 #define CLEAR_BUFFERTAG(a) \
 ( \
-	(a).rnode.spcNode = InvalidOid, \
-	(a).rnode.dbNode = InvalidOid, \
-	(a).rnode.relNode = InvalidOid, \
+	(a).rnode.node.spcNode = InvalidOid, \
+	(a).rnode.node.dbNode = InvalidOid, \
+	(a).rnode.node.relNode = InvalidOid, \
+	(a).rnode.backend = InvalidBackendId, \
 	(a).forkNum = InvalidForkNumber, \
 	(a).blockNum = InvalidBlockNumber \
 )
@@ -113,7 +114,7 @@ typedef struct buftag
 
 #define BUFFERTAGS_EQUAL(a,b) \
 ( \
-	RelFileNodeEquals((a).rnode, (b).rnode) && \
+	RelFileNodeBackendEquals((a).rnode, (b).rnode) && \
 	(a).blockNum == (b).blockNum && \
 	(a).forkNum == (b).forkNum \
 )
diff --git a/src/include/storage/bufmgr.h b/src/include/storage/bufmgr.h
index 509f4b7..3315fa0 100644
--- a/src/include/storage/bufmgr.h
+++ b/src/include/storage/bufmgr.h
@@ -205,7 +205,7 @@ extern XLogRecPtr BufferGetLSNAtomic(Buffer buffer);
 extern void PrintPinnedBufs(void);
 #endif
 extern Size BufferShmemSize(void);
-extern void BufferGetTag(Buffer buffer, RelFileNode *rnode,
+extern void BufferGetTag(Buffer buffer, RelFileNodeBackend *rnode,
 						 ForkNumber *forknum, BlockNumber *blknum);
 
 extern void MarkBufferDirtyHint(Buffer buffer, bool buffer_std);
diff --git a/src/include/storage/bufpage.h b/src/include/storage/bufpage.h
index 4ef6d8d..bac7a31 100644
--- a/src/include/storage/bufpage.h
+++ b/src/include/storage/bufpage.h
@@ -229,6 +229,13 @@ typedef PageHeaderData *PageHeader;
 #define PageIsNew(page) (((PageHeader) (page))->pd_upper == 0)
 
 /*
+ * Page of temporary relation is not initialized
+ */
+#define GlobalTempRelationPageIsNotInitialized(rel, page) \
+	((rel)->rd_rel->relpersistence == RELPERSISTENCE_SESSION && PageIsNew(page))
+
+
+/*
  * PageGetItemId
  *		Returns an item identifier of a page.
  */
diff --git a/src/include/storage/relfilenode.h b/src/include/storage/relfilenode.h
index 586500a..20aec72 100644
--- a/src/include/storage/relfilenode.h
+++ b/src/include/storage/relfilenode.h
@@ -75,10 +75,25 @@ typedef struct RelFileNodeBackend
 	BackendId	backend;
 } RelFileNodeBackend;
 
+/*
+ * Check whether it is local or global temporary relation, which data belongs only to one backend.
+ */
 #define RelFileNodeBackendIsTemp(rnode) \
 	((rnode).backend != InvalidBackendId)
 
 /*
+ * Check whether it is global temporary relation which metadata is shared by all sessions,
+ * but data is private for the current session.
+ */
+#define RelFileNodeBackendIsGlobalTemp(rnode) IsSessionRelationBackendId((rnode).backend)
+
+/*
+ * Check whether it is local temporary relation which exists only in this backend.
+ */
+#define RelFileNodeBackendIsLocalTemp(rnode) \
+	(RelFileNodeBackendIsTemp(rnode) && !RelFileNodeBackendIsGlobalTemp(rnode))
+
+/*
  * Note: RelFileNodeEquals and RelFileNodeBackendEquals compare relNode first
  * since that is most likely to be different in two unequal RelFileNodes.  It
  * is probably redundant to compare spcNode if the other fields are found equal,
diff --git a/src/include/utils/rel.h b/src/include/utils/rel.h
index b0fe19e..b361851 100644
--- a/src/include/utils/rel.h
+++ b/src/include/utils/rel.h
@@ -328,6 +328,17 @@ typedef struct StdRdOptions
 	((relation)->rd_options ? \
 	 ((StdRdOptions *) (relation)->rd_options)->parallel_workers : (defaultpw))
 
+/*
+ * Relation persistence is either TEMP either SESSION
+ */
+#define IsLocalRelpersistence(relpersistence) \
+	((relpersistence) == RELPERSISTENCE_TEMP || (relpersistence) == RELPERSISTENCE_SESSION)
+
+/*
+ * Relation is either global either local temp table
+ */
+#define RelationHasSessionScope(relation) \
+	IsLocalRelpersistence(((relation)->rd_rel->relpersistence))
 
 /*
  * ViewOptions
diff --git a/src/test/isolation/expected/inherit-global-temp.out b/src/test/isolation/expected/inherit-global-temp.out
new file mode 100644
index 0000000..6114f8c
--- /dev/null
+++ b/src/test/isolation/expected/inherit-global-temp.out
@@ -0,0 +1,218 @@
+Parsed test spec with 2 sessions
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_update_p s1_update_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_update_p: UPDATE inh_global_parent SET a = 11 WHERE a = 1;
+step s1_update_c: UPDATE inh_global_parent SET a = 13 WHERE a IN (3, 5);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+2              
+11             
+4              
+13             
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+4              
+13             
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+2              
+11             
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_update_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_update_c: UPDATE inh_global_parent SET a = 15 WHERE a IN (3, 5);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+6              
+15             
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+6              
+15             
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_delete_p s1_delete_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_delete_p: DELETE FROM inh_global_parent WHERE a = 2;
+step s1_delete_c: DELETE FROM inh_global_parent WHERE a IN (4, 6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+3              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_delete_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_delete_c: DELETE FROM inh_global_parent WHERE a IN (4, 6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+5              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_truncate_p s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_truncate_p s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_truncate_p: TRUNCATE inh_global_parent;
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_begin s1_truncate_p s2_select_p s1_commit
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_begin: BEGIN;
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s2_select_p: SELECT a FROM inh_global_parent; <waiting ...>
+step s1_commit: COMMIT;
+step s2_select_p: <... completed>
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_begin s1_truncate_p s2_select_c s1_commit
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_begin: BEGIN;
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2; <waiting ...>
+step s1_commit: COMMIT;
+step s2_select_c: <... completed>
+a              
+
+5              
+6              
diff --git a/src/test/isolation/isolation_schedule b/src/test/isolation/isolation_schedule
index 74b5077..44df4e0 100644
--- a/src/test/isolation/isolation_schedule
+++ b/src/test/isolation/isolation_schedule
@@ -85,3 +85,4 @@ test: plpgsql-toast
 test: truncate-conflict
 test: serializable-parallel
 test: serializable-parallel-2
+test: inherit-global-temp
diff --git a/src/test/isolation/specs/inherit-global-temp.spec b/src/test/isolation/specs/inherit-global-temp.spec
new file mode 100644
index 0000000..5e95dd6
--- /dev/null
+++ b/src/test/isolation/specs/inherit-global-temp.spec
@@ -0,0 +1,73 @@
+# This is a copy of the inherit-temp test with little changes for global temporary tables.
+#
+
+setup
+{
+  CREATE TABLE inh_global_parent (a int);
+}
+
+teardown
+{
+  DROP TABLE inh_global_parent;
+}
+
+# Session 1 executes actions which act directly on both the parent and
+# its child.  Abbreviation "c" is used for queries working on the child
+# and "p" on the parent.
+session "s1"
+setup
+{
+  CREATE GLOBAL TEMPORARY TABLE inh_global_temp_child_s1 () INHERITS (inh_global_parent);
+}
+step "s1_begin" { BEGIN; }
+step "s1_truncate_p" { TRUNCATE inh_global_parent; }
+step "s1_select_p" { SELECT a FROM inh_global_parent; }
+step "s1_select_c" { SELECT a FROM inh_global_temp_child_s1; }
+step "s1_insert_p" { INSERT INTO inh_global_parent VALUES (1), (2); }
+step "s1_insert_c" { INSERT INTO inh_global_temp_child_s1 VALUES (3), (4); }
+step "s1_update_p" { UPDATE inh_global_parent SET a = 11 WHERE a = 1; }
+step "s1_update_c" { UPDATE inh_global_parent SET a = 13 WHERE a IN (3, 5); }
+step "s1_delete_p" { DELETE FROM inh_global_parent WHERE a = 2; }
+step "s1_delete_c" { DELETE FROM inh_global_parent WHERE a IN (4, 6); }
+step "s1_commit" { COMMIT; }
+teardown
+{
+  DROP TABLE inh_global_temp_child_s1;
+}
+
+# Session 2 executes actions on the parent which act only on the child.
+session "s2"
+setup
+{
+  CREATE GLOBAL TEMPORARY TABLE inh_global_temp_child_s2 () INHERITS (inh_global_parent);
+}
+step "s2_truncate_p" { TRUNCATE inh_global_parent; }
+step "s2_select_p" { SELECT a FROM inh_global_parent; }
+step "s2_select_c" { SELECT a FROM inh_global_temp_child_s2; }
+step "s2_insert_c" { INSERT INTO inh_global_temp_child_s2 VALUES (5), (6); }
+step "s2_update_c" { UPDATE inh_global_parent SET a = 15 WHERE a IN (3, 5); }
+step "s2_delete_c" { DELETE FROM inh_global_parent WHERE a IN (4, 6); }
+teardown
+{
+  DROP TABLE inh_global_temp_child_s2;
+}
+
+# Check INSERT behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check UPDATE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_update_p" "s1_update_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_update_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check DELETE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_delete_p" "s1_delete_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_delete_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check TRUNCATE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_truncate_p" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_truncate_p" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# TRUNCATE on a parent tree does not block access to temporary child relation
+# of another session, and blocks when scanning the parent.
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_begin" "s1_truncate_p" "s2_select_p" "s1_commit"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_begin" "s1_truncate_p" "s2_select_c" "s1_commit"
diff --git a/src/test/regress/expected/global_temp.out b/src/test/regress/expected/global_temp.out
new file mode 100644
index 0000000..b7bf067
--- /dev/null
+++ b/src/test/regress/expected/global_temp.out
@@ -0,0 +1,323 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+-- Test ON COMMIT DELETE ROWS
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+   2
+(2 rows)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+(1 row)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+ col 
+-----
+   1
+(1 row)
+
+SELECT * FROM global_temptest2;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest2;
+DROP TABLE global_temptest1;
+-- Unsupported ON COMMIT and foreign key combination
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+ERROR:  unsupported ON COMMIT and foreign key combination
+DETAIL:  Table "global_temptest4" references "global_temptest3", but they do not have the same ON COMMIT setting.
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+ a 
+---
+(0 rows)
+
+DROP TABLE temp_parted_oncommit;
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+              relname              
+-----------------------------------
+ global_temp_parted_oncommit_test
+ global_temp_parted_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_parted_oncommit_test;
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+            relname             
+--------------------------------
+ global_temp_inh_oncommit_test
+ global_temp_inh_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ERROR:  cannot inherit from temporary relation "global_temp_table"
+ROLLBACK;
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM global_temp_table;
+ a 
+---
+ 1
+(1 row)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+(2 rows)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       1
+(1 row)
+
+\c
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+(0 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       2
+(1 row)
+
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       3
+(1 row)
+
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
+-- Test two phase commit
+CREATE TABLE global_temptest_persistent(col int);
+CREATE GLOBAL TEMP TABLE global_temptest(col int);
+INSERT INTO global_temptest VALUES (1);
+BEGIN;
+INSERT INTO global_temptest VALUES (2);
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+   2
+(2 rows)
+
+PREPARE TRANSACTION 'global_temp1';
+-- We can't see anything from an uncommitted transaction
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+(1 row)
+
+BEGIN;
+INSERT INTO global_temptest VALUES (3);
+INSERT INTO global_temptest_persistent SELECT * FROM global_temptest;
+PREPARE TRANSACTION 'global_temp2';
+COMMIT PREPARED 'global_temp1';
+-- 1, 2
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+   2
+(2 rows)
+
+-- Nothing
+SELECT * FROM global_temptest_persistent;
+ col 
+-----
+(0 rows)
+
+\c
+-- The temp table is empty now.
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+-- Still nothing in global_temptest_persistent table;
+SELECT * FROM global_temptest_persistent;
+ col 
+-----
+(0 rows)
+
+INSERT INTO global_temptest VALUES (4);
+COMMIT PREPARED 'global_temp2';
+-- Only 4
+SELECT * FROM global_temptest;
+ col 
+-----
+   4
+(1 row)
+
+-- 1, 3
+SELECT * FROM global_temptest_persistent;
+ col 
+-----
+   1
+   3
+(2 rows)
+
+\c
+DROP TABLE global_temptest;
+DROP TABLE global_temptest_persistent;
diff --git a/src/test/regress/expected/global_temp_0.out b/src/test/regress/expected/global_temp_0.out
new file mode 100644
index 0000000..934e751
--- /dev/null
+++ b/src/test/regress/expected/global_temp_0.out
@@ -0,0 +1,326 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+-- Test ON COMMIT DELETE ROWS
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+   2
+(2 rows)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+(1 row)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+ col 
+-----
+   1
+(1 row)
+
+SELECT * FROM global_temptest2;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest2;
+DROP TABLE global_temptest1;
+-- Unsupported ON COMMIT and foreign key combination
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+ERROR:  unsupported ON COMMIT and foreign key combination
+DETAIL:  Table "global_temptest4" references "global_temptest3", but they do not have the same ON COMMIT setting.
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+ a 
+---
+(0 rows)
+
+DROP TABLE temp_parted_oncommit;
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+              relname              
+-----------------------------------
+ global_temp_parted_oncommit_test
+ global_temp_parted_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_parted_oncommit_test;
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+            relname             
+--------------------------------
+ global_temp_inh_oncommit_test
+ global_temp_inh_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ERROR:  cannot inherit from temporary relation "global_temp_table"
+ROLLBACK;
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM global_temp_table;
+ a 
+---
+ 1
+(1 row)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+(2 rows)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       1
+(1 row)
+
+\c
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+(0 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       2
+(1 row)
+
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       3
+(1 row)
+
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
+-- Test two phase commit
+CREATE TABLE global_temptest_persistent(col int);
+CREATE GLOBAL TEMP TABLE global_temptest(col int);
+INSERT INTO global_temptest VALUES (1);
+BEGIN;
+INSERT INTO global_temptest VALUES (2);
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+   2
+(2 rows)
+
+PREPARE TRANSACTION 'global_temp1';
+ERROR:  prepared transactions are disabled
+HINT:  Set max_prepared_transactions to a nonzero value.
+-- We can't see anything from an uncommitted transaction
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+(1 row)
+
+BEGIN;
+INSERT INTO global_temptest VALUES (3);
+INSERT INTO global_temptest_persistent SELECT * FROM global_temptest;
+PREPARE TRANSACTION 'global_temp2';
+ERROR:  prepared transactions are disabled
+HINT:  Set max_prepared_transactions to a nonzero value.
+COMMIT PREPARED 'global_temp1';
+ERROR:  prepared transaction with identifier "global_temp1" does not exist
+-- 1, 2
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+(1 row)
+
+-- Nothing
+SELECT * FROM global_temptest_persistent;
+ col 
+-----
+(0 rows)
+
+\c
+-- The temp table is empty now.
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+-- Still nothing in global_temptest_persistent table;
+SELECT * FROM global_temptest_persistent;
+ col 
+-----
+(0 rows)
+
+INSERT INTO global_temptest VALUES (4);
+COMMIT PREPARED 'global_temp2';
+ERROR:  prepared transaction with identifier "global_temp2" does not exist
+-- Only 4
+SELECT * FROM global_temptest;
+ col 
+-----
+   4
+(1 row)
+
+-- 1, 3
+SELECT * FROM global_temptest_persistent;
+ col 
+-----
+(0 rows)
+
+\c
+DROP TABLE global_temptest;
+DROP TABLE global_temptest_persistent;
diff --git a/src/test/regress/expected/session_table.out b/src/test/regress/expected/session_table.out
new file mode 100644
index 0000000..1b9b3f4
--- /dev/null
+++ b/src/test/regress/expected/session_table.out
@@ -0,0 +1,64 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+ count 
+-------
+ 10000
+(1 row)
+
+\c
+select count(*) from my_private_table;
+ count 
+-------
+     0
+(1 row)
+
+select * from my_private_table where x=10001;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select * from my_private_table where y=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select count(*) from my_private_table;
+ count  
+--------
+ 100000
+(1 row)
+
+\c
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+   x    |   y    
+--------+--------
+ 100000 | 100000
+(1 row)
+
+drop table  my_private_table;
diff --git a/src/test/regress/parallel_schedule b/src/test/regress/parallel_schedule
index fc0f141..507cf7d 100644
--- a/src/test/regress/parallel_schedule
+++ b/src/test/regress/parallel_schedule
@@ -107,7 +107,7 @@ test: json jsonb json_encoding jsonpath jsonpath_encoding jsonb_jsonpath
 # NB: temp.sql does a reconnect which transiently uses 2 connections,
 # so keep this parallel group to at most 19 tests
 # ----------
-test: plancache limit plpgsql copy2 temp domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
+test: plancache limit plpgsql copy2 temp global_temp session_table domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
 
 # ----------
 # Another group of parallel tests
diff --git a/src/test/regress/serial_schedule b/src/test/regress/serial_schedule
index 68ac56a..3890777 100644
--- a/src/test/regress/serial_schedule
+++ b/src/test/regress/serial_schedule
@@ -172,6 +172,8 @@ test: limit
 test: plpgsql
 test: copy2
 test: temp
+test: global_temp
+test: session_table
 test: domain
 test: rangefuncs
 test: prepare
diff --git a/src/test/regress/sql/global_temp.sql b/src/test/regress/sql/global_temp.sql
new file mode 100644
index 0000000..4d2da8d
--- /dev/null
+++ b/src/test/regress/sql/global_temp.sql
@@ -0,0 +1,191 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+
+-- Test ON COMMIT DELETE ROWS
+
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+SELECT * FROM global_temptest2;
+
+DROP TABLE global_temptest2;
+DROP TABLE global_temptest1;
+
+-- Unsupported ON COMMIT and foreign key combination
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+DROP TABLE temp_parted_oncommit;
+
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+DROP TABLE global_temp_parted_oncommit_test;
+
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ROLLBACK;
+
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+COMMIT;
+SELECT * FROM global_temp_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+COMMIT;
+SELECT * FROM normal_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+\c
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
+
+-- Test two phase commit
+CREATE TABLE global_temptest_persistent(col int);
+CREATE GLOBAL TEMP TABLE global_temptest(col int);
+INSERT INTO global_temptest VALUES (1);
+
+BEGIN;
+INSERT INTO global_temptest VALUES (2);
+SELECT * FROM global_temptest;
+PREPARE TRANSACTION 'global_temp1';
+-- We can't see anything from an uncommitted transaction
+SELECT * FROM global_temptest;
+
+BEGIN;
+INSERT INTO global_temptest VALUES (3);
+INSERT INTO global_temptest_persistent SELECT * FROM global_temptest;
+PREPARE TRANSACTION 'global_temp2';
+COMMIT PREPARED 'global_temp1';
+-- 1, 2
+SELECT * FROM global_temptest;
+-- Nothing
+SELECT * FROM global_temptest_persistent;
+\c
+-- The temp table is empty now.
+SELECT * FROM global_temptest;
+-- Still nothing in global_temptest_persistent table;
+SELECT * FROM global_temptest_persistent;
+INSERT INTO global_temptest VALUES (4);
+COMMIT PREPARED 'global_temp2';
+-- Only 4
+SELECT * FROM global_temptest;
+-- 1, 3
+SELECT * FROM global_temptest_persistent;
+\c
+DROP TABLE global_temptest;
+DROP TABLE global_temptest_persistent;
diff --git a/src/test/regress/sql/session_table.sql b/src/test/regress/sql/session_table.sql
new file mode 100644
index 0000000..c6663dc
--- /dev/null
+++ b/src/test/regress/sql/session_table.sql
@@ -0,0 +1,18 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+\c
+select count(*) from my_private_table;
+select * from my_private_table where x=10001;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+select * from my_private_table where y=10001;
+select count(*) from my_private_table;
+\c
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+drop table  my_private_table;

diff --git a/contrib/pg_buffercache/pg_buffercache_pages.c b/contrib/pg_buffercache/pg_buffercache_pages.c
index 1bd579f..2d93f6f 100644
--- a/contrib/pg_buffercache/pg_buffercache_pages.c
+++ b/contrib/pg_buffercache/pg_buffercache_pages.c
@@ -153,9 +153,9 @@ pg_buffercache_pages(PG_FUNCTION_ARGS)
 			buf_state = LockBufHdr(bufHdr);
 
 			fctx->record[i].bufferid = BufferDescriptorGetBuffer(bufHdr);
-			fctx->record[i].relfilenode = bufHdr->tag.rnode.relNode;
-			fctx->record[i].reltablespace = bufHdr->tag.rnode.spcNode;
-			fctx->record[i].reldatabase = bufHdr->tag.rnode.dbNode;
+			fctx->record[i].relfilenode = bufHdr->tag.rnode.node.relNode;
+			fctx->record[i].reltablespace = bufHdr->tag.rnode.node.spcNode;
+			fctx->record[i].reldatabase = bufHdr->tag.rnode.node.dbNode;
 			fctx->record[i].forknum = bufHdr->tag.forkNum;
 			fctx->record[i].blocknum = bufHdr->tag.blockNum;
 			fctx->record[i].usagecount = BUF_STATE_GET_USAGECOUNT(buf_state);
diff --git a/contrib/pg_prewarm/autoprewarm.c b/contrib/pg_prewarm/autoprewarm.c
index 38ae240..8a04954 100644
--- a/contrib/pg_prewarm/autoprewarm.c
+++ b/contrib/pg_prewarm/autoprewarm.c
@@ -608,9 +608,9 @@ apw_dump_now(bool is_bgworker, bool dump_unlogged)
 		if (buf_state & BM_TAG_VALID &&
 			((buf_state & BM_PERMANENT) || dump_unlogged))
 		{
-			block_info_array[num_blocks].database = bufHdr->tag.rnode.dbNode;
-			block_info_array[num_blocks].tablespace = bufHdr->tag.rnode.spcNode;
-			block_info_array[num_blocks].filenode = bufHdr->tag.rnode.relNode;
+			block_info_array[num_blocks].database = bufHdr->tag.rnode.node.dbNode;
+			block_info_array[num_blocks].tablespace = bufHdr->tag.rnode.node.spcNode;
+			block_info_array[num_blocks].filenode = bufHdr->tag.rnode.node.relNode;
 			block_info_array[num_blocks].forknum = bufHdr->tag.forkNum;
 			block_info_array[num_blocks].blocknum = bufHdr->tag.blockNum;
 			++num_blocks;
diff --git a/contrib/pgrowlocks/pgrowlocks.c b/contrib/pgrowlocks/pgrowlocks.c
index a2c44a9..43b4c66 100644
--- a/contrib/pgrowlocks/pgrowlocks.c
+++ b/contrib/pgrowlocks/pgrowlocks.c
@@ -158,7 +158,8 @@ pgrowlocks(PG_FUNCTION_ARGS)
 		/* must hold a buffer lock to call HeapTupleSatisfiesUpdate */
 		LockBuffer(hscan->rs_cbuf, BUFFER_LOCK_SHARE);
 
-		htsu = HeapTupleSatisfiesUpdate(tuple,
+		htsu = HeapTupleSatisfiesUpdate(mydata->rel,
+										tuple,
 										GetCurrentCommandId(false),
 										hscan->rs_cbuf);
 		xmax = HeapTupleHeaderGetRawXmax(tuple->t_data);
diff --git a/contrib/pgstattuple/pgstattuple.c b/contrib/pgstattuple/pgstattuple.c
index 70af43e..9cce720 100644
--- a/contrib/pgstattuple/pgstattuple.c
+++ b/contrib/pgstattuple/pgstattuple.c
@@ -349,7 +349,7 @@ pgstat_heap(Relation rel, FunctionCallInfo fcinfo)
 		/* must hold a buffer lock to call HeapTupleSatisfiesVisibility */
 		LockBuffer(hscan->rs_cbuf, BUFFER_LOCK_SHARE);
 
-		if (HeapTupleSatisfiesVisibility(tuple, &SnapshotDirty, hscan->rs_cbuf))
+		if (HeapTupleSatisfiesVisibility(rel, tuple, &SnapshotDirty, hscan->rs_cbuf))
 		{
 			stat.tuple_len += tuple->t_len;
 			stat.tuple_count++;
diff --git a/src/backend/access/brin/brin_revmap.c b/src/backend/access/brin/brin_revmap.c
index e2bfbf8..97041a8 100644
--- a/src/backend/access/brin/brin_revmap.c
+++ b/src/backend/access/brin/brin_revmap.c
@@ -25,6 +25,7 @@
 #include "access/brin_revmap.h"
 #include "access/brin_tuple.h"
 #include "access/brin_xlog.h"
+#include "access/brin.h"
 #include "access/rmgr.h"
 #include "access/xloginsert.h"
 #include "miscadmin.h"
@@ -79,6 +80,11 @@ brinRevmapInitialize(Relation idxrel, BlockNumber *pagesPerRange,
 	meta = ReadBuffer(idxrel, BRIN_METAPAGE_BLKNO);
 	LockBuffer(meta, BUFFER_LOCK_SHARE);
 	page = BufferGetPage(meta);
+
+	if (GlobalTempRelationPageIsNotInitialized(idxrel, page))
+		brin_metapage_init(page, BrinGetPagesPerRange(idxrel),
+						   BRIN_CURRENT_VERSION);
+
 	TestForOldSnapshot(snapshot, idxrel, page);
 	metadata = (BrinMetaPageData *) PageGetContents(page);
 
diff --git a/src/backend/access/gin/ginfast.c b/src/backend/access/gin/ginfast.c
index 439a91b..8a6ac71 100644
--- a/src/backend/access/gin/ginfast.c
+++ b/src/backend/access/gin/ginfast.c
@@ -241,6 +241,16 @@ ginHeapTupleFastInsert(GinState *ginstate, GinTupleCollector *collector)
 	metabuffer = ReadBuffer(index, GIN_METAPAGE_BLKNO);
 	metapage = BufferGetPage(metabuffer);
 
+	if (GlobalTempRelationPageIsNotInitialized(index, metapage))
+	{
+		Buffer rootbuffer = ReadBuffer(index, GIN_ROOT_BLKNO);
+		LockBuffer(rootbuffer, BUFFER_LOCK_EXCLUSIVE);
+		GinInitMetabuffer(metabuffer);
+		GinInitBuffer(rootbuffer, GIN_LEAF);
+		MarkBufferDirty(rootbuffer);
+		UnlockReleaseBuffer(rootbuffer);
+	}
+
 	/*
 	 * An insertion to the pending list could logically belong anywhere in the
 	 * tree, so it conflicts with all serializable scans.  All scans acquire a
diff --git a/src/backend/access/gin/ginget.c b/src/backend/access/gin/ginget.c
index b18ae2b..41bab5d 100644
--- a/src/backend/access/gin/ginget.c
+++ b/src/backend/access/gin/ginget.c
@@ -1750,7 +1750,7 @@ collectMatchesForHeapRow(IndexScanDesc scan, pendingPosition *pos)
 /*
  * Collect all matched rows from pending list into bitmap.
  */
-static void
+static bool
 scanPendingInsert(IndexScanDesc scan, TIDBitmap *tbm, int64 *ntids)
 {
 	GinScanOpaque so = (GinScanOpaque) scan->opaque;
@@ -1774,6 +1774,12 @@ scanPendingInsert(IndexScanDesc scan, TIDBitmap *tbm, int64 *ntids)
 	LockBuffer(metabuffer, GIN_SHARE);
 	page = BufferGetPage(metabuffer);
 	TestForOldSnapshot(scan->xs_snapshot, scan->indexRelation, page);
+
+	if (GlobalTempRelationPageIsNotInitialized(scan->indexRelation, page))
+	{
+		UnlockReleaseBuffer(metabuffer);
+		return false;
+	}
 	blkno = GinPageGetMeta(page)->head;
 
 	/*
@@ -1784,7 +1790,7 @@ scanPendingInsert(IndexScanDesc scan, TIDBitmap *tbm, int64 *ntids)
 	{
 		/* No pending list, so proceed with normal scan */
 		UnlockReleaseBuffer(metabuffer);
-		return;
+		return true;
 	}
 
 	pos.pendingBuffer = ReadBuffer(scan->indexRelation, blkno);
@@ -1840,6 +1846,7 @@ scanPendingInsert(IndexScanDesc scan, TIDBitmap *tbm, int64 *ntids)
 	}
 
 	pfree(pos.hasMatchKey);
+	return true;
 }
 
 
@@ -1875,7 +1882,8 @@ gingetbitmap(IndexScanDesc scan, TIDBitmap *tbm)
 	 * to scan the main index before the pending list, since concurrent
 	 * cleanup could then make us miss entries entirely.
 	 */
-	scanPendingInsert(scan, tbm, &ntids);
+	if (!scanPendingInsert(scan, tbm, &ntids))
+		return 0;
 
 	/*
 	 * Now scan the main index.
diff --git a/src/backend/access/gin/ginxlog.c b/src/backend/access/gin/ginxlog.c
index c945b28..14d4e48 100644
--- a/src/backend/access/gin/ginxlog.c
+++ b/src/backend/access/gin/ginxlog.c
@@ -95,13 +95,13 @@ ginRedoInsertEntry(Buffer buffer, bool isLeaf, BlockNumber rightblkno, void *rda
 
 	if (PageAddItem(page, (Item) itup, IndexTupleSize(itup), offset, false, false) == InvalidOffsetNumber)
 	{
-		RelFileNode node;
+		RelFileNodeBackend rnode;
 		ForkNumber	forknum;
 		BlockNumber blknum;
 
-		BufferGetTag(buffer, &node, &forknum, &blknum);
+		BufferGetTag(buffer, &rnode, &forknum, &blknum);
 		elog(ERROR, "failed to add item to index page in %u/%u/%u",
-			 node.spcNode, node.dbNode, node.relNode);
+			 rnode.node.spcNode, rnode.node.dbNode, rnode.node.relNode);
 	}
 }
 
diff --git a/src/backend/access/gist/gist.c b/src/backend/access/gist/gist.c
index e9ca4b8..d3ea072 100644
--- a/src/backend/access/gist/gist.c
+++ b/src/backend/access/gist/gist.c
@@ -677,7 +677,10 @@ gistdoinsert(Relation r, IndexTuple itup, Size freespace,
 		if (!xlocked)
 		{
 			LockBuffer(stack->buffer, GIST_SHARE);
-			gistcheckpage(state.r, stack->buffer);
+			if (stack->blkno == GIST_ROOT_BLKNO && GlobalTempRelationPageIsNotInitialized(state.r, BufferGetPage(stack->buffer)))
+				GISTInitBuffer(stack->buffer, F_LEAF);
+			else
+				gistcheckpage(state.r, stack->buffer);
 		}
 
 		stack->page = (Page) BufferGetPage(stack->buffer);
diff --git a/src/backend/access/gist/gistget.c b/src/backend/access/gist/gistget.c
index 4e0c500..cced239 100644
--- a/src/backend/access/gist/gistget.c
+++ b/src/backend/access/gist/gistget.c
@@ -339,7 +339,10 @@ gistScanPage(IndexScanDesc scan, GISTSearchItem *pageItem, double *myDistances,
 	buffer = ReadBuffer(scan->indexRelation, pageItem->blkno);
 	LockBuffer(buffer, GIST_SHARE);
 	PredicateLockPage(r, BufferGetBlockNumber(buffer), scan->xs_snapshot);
-	gistcheckpage(scan->indexRelation, buffer);
+	if (pageItem->blkno == GIST_ROOT_BLKNO && GlobalTempRelationPageIsNotInitialized(r, BufferGetPage(buffer)))
+		GISTInitBuffer(buffer, F_LEAF);
+	else
+		gistcheckpage(scan->indexRelation, buffer);
 	page = BufferGetPage(buffer);
 	TestForOldSnapshot(scan->xs_snapshot, r, page);
 	opaque = GistPageGetOpaque(page);
diff --git a/src/backend/access/gist/gistutil.c b/src/backend/access/gist/gistutil.c
index 9726020..c99701d 100644
--- a/src/backend/access/gist/gistutil.c
+++ b/src/backend/access/gist/gistutil.c
@@ -1028,7 +1028,7 @@ gistGetFakeLSN(Relation rel)
 {
 	static XLogRecPtr counter = FirstNormalUnloggedLSN;
 
-	if (rel->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
+	if (RelationHasSessionScope(rel))
 	{
 		/*
 		 * Temporary relations are only accessible in our session, so a simple
diff --git a/src/backend/access/hash/hashpage.c b/src/backend/access/hash/hashpage.c
index defdc9b..35de5fa 100644
--- a/src/backend/access/hash/hashpage.c
+++ b/src/backend/access/hash/hashpage.c
@@ -75,13 +75,20 @@ _hash_getbuf(Relation rel, BlockNumber blkno, int access, int flags)
 
 	buf = ReadBuffer(rel, blkno);
 
-	if (access != HASH_NOLOCK)
-		LockBuffer(buf, access);
-
 	/* ref count and lock type are correct */
 
-	_hash_checkpage(rel, buf, flags);
-
+	if (blkno == HASH_METAPAGE && GlobalTempRelationPageIsNotInitialized(rel, BufferGetPage(buf)))
+	{
+		_hash_init(rel, 0, MAIN_FORKNUM);
+		if (access != HASH_NOLOCK)
+			LockBuffer(buf, access);
+	}
+	else
+	{
+		if (access != HASH_NOLOCK)
+			LockBuffer(buf, access);
+		_hash_checkpage(rel, buf, flags);
+	}
 	return buf;
 }
 
@@ -339,7 +346,7 @@ _hash_init(Relation rel, double num_tuples, ForkNumber forkNum)
 	bool		use_wal;
 
 	/* safety check */
-	if (RelationGetNumberOfBlocksInFork(rel, forkNum) != 0)
+	if (rel->rd_rel->relpersistence != RELPERSISTENCE_SESSION && RelationGetNumberOfBlocksInFork(rel, forkNum) != 0)
 		elog(ERROR, "cannot initialize non-empty hash index \"%s\"",
 			 RelationGetRelationName(rel));
 
diff --git a/src/backend/access/heap/heapam.c b/src/backend/access/heap/heapam.c
index 9430994..181efde 100644
--- a/src/backend/access/heap/heapam.c
+++ b/src/backend/access/heap/heapam.c
@@ -444,7 +444,7 @@ heapgetpage(TableScanDesc sscan, BlockNumber page)
 			if (all_visible)
 				valid = true;
 			else
-				valid = HeapTupleSatisfiesVisibility(&loctup, snapshot, buffer);
+				valid = HeapTupleSatisfiesVisibility(scan->rs_base.rs_rd, &loctup, snapshot, buffer);
 
 			CheckForSerializableConflictOut(valid, scan->rs_base.rs_rd,
 											&loctup, buffer, snapshot);
@@ -664,7 +664,8 @@ heapgettup(HeapScanDesc scan,
 				/*
 				 * if current tuple qualifies, return it.
 				 */
-				valid = HeapTupleSatisfiesVisibility(tuple,
+				valid = HeapTupleSatisfiesVisibility(scan->rs_base.rs_rd,
+													 tuple,
 													 snapshot,
 													 scan->rs_cbuf);
 
@@ -1474,7 +1475,7 @@ heap_fetch(Relation relation,
 	/*
 	 * check tuple visibility, then release lock
 	 */
-	valid = HeapTupleSatisfiesVisibility(tuple, snapshot, buffer);
+	valid = HeapTupleSatisfiesVisibility(relation, tuple, snapshot, buffer);
 
 	if (valid)
 		PredicateLockTuple(relation, tuple, snapshot);
@@ -1612,7 +1613,7 @@ heap_hot_search_buffer(ItemPointer tid, Relation relation, Buffer buffer,
 			ItemPointerSet(&(heapTuple->t_self), BufferGetBlockNumber(buffer), offnum);
 
 			/* If it's visible per the snapshot, we must return it */
-			valid = HeapTupleSatisfiesVisibility(heapTuple, snapshot, buffer);
+			valid = HeapTupleSatisfiesVisibility(relation, heapTuple, snapshot, buffer);
 			CheckForSerializableConflictOut(valid, relation, heapTuple,
 											buffer, snapshot);
 			/* reset to original, non-redirected, tid */
@@ -1754,7 +1755,7 @@ heap_get_latest_tid(TableScanDesc sscan,
 		 * Check tuple visibility; if visible, set it as the new result
 		 * candidate.
 		 */
-		valid = HeapTupleSatisfiesVisibility(&tp, snapshot, buffer);
+		valid = HeapTupleSatisfiesVisibility(relation, &tp, snapshot, buffer);
 		CheckForSerializableConflictOut(valid, relation, &tp, buffer, snapshot);
 		if (valid)
 			*tid = ctid;
@@ -1851,6 +1852,14 @@ ReleaseBulkInsertStatePin(BulkInsertState bistate)
 }
 
 
+static TransactionId
+GetTransactionId(Relation relation)
+{
+	return relation->rd_rel->relpersistence == RELPERSISTENCE_SESSION && RecoveryInProgress()
+		? GetReplicaTransactionId()
+		: GetCurrentTransactionId();
+}
+
 /*
  *	heap_insert		- insert tuple into a heap
  *
@@ -1873,7 +1882,7 @@ void
 heap_insert(Relation relation, HeapTuple tup, CommandId cid,
 			int options, BulkInsertState bistate)
 {
-	TransactionId xid = GetCurrentTransactionId();
+	TransactionId xid = GetTransactionId(relation);
 	HeapTuple	heaptup;
 	Buffer		buffer;
 	Buffer		vmbuffer = InvalidBuffer;
@@ -2110,7 +2119,7 @@ void
 heap_multi_insert(Relation relation, TupleTableSlot **slots, int ntuples,
 				  CommandId cid, int options, BulkInsertState bistate)
 {
-	TransactionId xid = GetCurrentTransactionId();
+	TransactionId xid = GetTransactionId(relation);
 	HeapTuple  *heaptuples;
 	int			i;
 	int			ndone;
@@ -2449,7 +2458,7 @@ heap_delete(Relation relation, ItemPointer tid,
 			TM_FailureData *tmfd, bool changingPart)
 {
 	TM_Result	result;
-	TransactionId xid = GetCurrentTransactionId();
+	TransactionId xid = GetTransactionId(relation);
 	ItemId		lp;
 	HeapTupleData tp;
 	Page		page;
@@ -2514,7 +2523,7 @@ heap_delete(Relation relation, ItemPointer tid,
 	tp.t_self = *tid;
 
 l1:
-	result = HeapTupleSatisfiesUpdate(&tp, cid, buffer);
+	result = HeapTupleSatisfiesUpdate(relation, &tp, cid, buffer);
 
 	if (result == TM_Invisible)
 	{
@@ -2633,7 +2642,7 @@ l1:
 	if (crosscheck != InvalidSnapshot && result == TM_Ok)
 	{
 		/* Perform additional check for transaction-snapshot mode RI updates */
-		if (!HeapTupleSatisfiesVisibility(&tp, crosscheck, buffer))
+		if (!HeapTupleSatisfiesVisibility(relation, &tp, crosscheck, buffer))
 			result = TM_Updated;
 	}
 
@@ -2900,7 +2909,7 @@ heap_update(Relation relation, ItemPointer otid, HeapTuple newtup,
 			TM_FailureData *tmfd, LockTupleMode *lockmode)
 {
 	TM_Result	result;
-	TransactionId xid = GetCurrentTransactionId();
+	TransactionId xid = GetTransactionId(relation);
 	Bitmapset  *hot_attrs;
 	Bitmapset  *key_attrs;
 	Bitmapset  *id_attrs;
@@ -3070,7 +3079,7 @@ heap_update(Relation relation, ItemPointer otid, HeapTuple newtup,
 l2:
 	checked_lockers = false;
 	locker_remains = false;
-	result = HeapTupleSatisfiesUpdate(&oldtup, cid, buffer);
+	result = HeapTupleSatisfiesUpdate(relation, &oldtup, cid, buffer);
 
 	/* see below about the "no wait" case */
 	Assert(result != TM_BeingModified || wait);
@@ -3262,7 +3271,7 @@ l2:
 	if (crosscheck != InvalidSnapshot && result == TM_Ok)
 	{
 		/* Perform additional check for transaction-snapshot mode RI updates */
-		if (!HeapTupleSatisfiesVisibility(&oldtup, crosscheck, buffer))
+		if (!HeapTupleSatisfiesVisibility(relation, &oldtup, crosscheck, buffer))
 		{
 			result = TM_Updated;
 			Assert(!ItemPointerEquals(&oldtup.t_self, &oldtup.t_data->t_ctid));
@@ -4018,7 +4027,7 @@ heap_lock_tuple(Relation relation, HeapTuple tuple,
 	tuple->t_tableOid = RelationGetRelid(relation);
 
 l3:
-	result = HeapTupleSatisfiesUpdate(tuple, cid, *buffer);
+	result = HeapTupleSatisfiesUpdate(relation, tuple, cid, *buffer);
 
 	if (result == TM_Invisible)
 	{
@@ -4193,7 +4202,7 @@ l3:
 					TM_Result	res;
 
 					res = heap_lock_updated_tuple(relation, tuple, &t_ctid,
-												  GetCurrentTransactionId(),
+												  GetTransactionId(relation),
 												  mode);
 					if (res != TM_Ok)
 					{
@@ -4441,7 +4450,7 @@ l3:
 				TM_Result	res;
 
 				res = heap_lock_updated_tuple(relation, tuple, &t_ctid,
-											  GetCurrentTransactionId(),
+											  GetTransactionId(relation),
 											  mode);
 				if (res != TM_Ok)
 				{
@@ -4550,7 +4559,7 @@ failed:
 	 * state if multixact.c elogs.
 	 */
 	compute_new_xmax_infomask(xmax, old_infomask, tuple->t_data->t_infomask2,
-							  GetCurrentTransactionId(), mode, false,
+							  GetTransactionId(relation), mode, false,
 							  &xid, &new_infomask, &new_infomask2);
 
 	START_CRIT_SECTION();
@@ -5570,7 +5579,7 @@ heap_finish_speculative(Relation relation, ItemPointer tid)
 void
 heap_abort_speculative(Relation relation, ItemPointer tid)
 {
-	TransactionId xid = GetCurrentTransactionId();
+	TransactionId xid = GetTransactionId(relation);
 	ItemId		lp;
 	HeapTupleData tp;
 	Page		page;
diff --git a/src/backend/access/heap/heapam_handler.c b/src/backend/access/heap/heapam_handler.c
index 09bc6fe..a189834 100644
--- a/src/backend/access/heap/heapam_handler.c
+++ b/src/backend/access/heap/heapam_handler.c
@@ -226,7 +226,8 @@ heapam_tuple_satisfies_snapshot(Relation rel, TupleTableSlot *slot,
 	 * Caller should be holding pin, but not lock.
 	 */
 	LockBuffer(bslot->buffer, BUFFER_LOCK_SHARE);
-	res = HeapTupleSatisfiesVisibility(bslot->base.tuple, snapshot,
+
+	res = HeapTupleSatisfiesVisibility(rel, bslot->base.tuple, snapshot,
 									   bslot->buffer);
 	LockBuffer(bslot->buffer, BUFFER_LOCK_UNLOCK);
 
@@ -671,6 +672,7 @@ heapam_relation_copy_data(Relation rel, const RelFileNode *newrnode)
 			 * init fork of an unlogged relation.
 			 */
 			if (rel->rd_rel->relpersistence == RELPERSISTENCE_PERMANENT ||
+				rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ||
 				(rel->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED &&
 				 forkNum == INIT_FORKNUM))
 				log_smgrcreate(newrnode, forkNum);
@@ -2160,7 +2162,7 @@ heapam_scan_bitmap_next_block(TableScanDesc scan,
 			loctup.t_len = ItemIdGetLength(lp);
 			loctup.t_tableOid = scan->rs_rd->rd_id;
 			ItemPointerSet(&loctup.t_self, page, offnum);
-			valid = HeapTupleSatisfiesVisibility(&loctup, snapshot, buffer);
+			valid = HeapTupleSatisfiesVisibility(scan->rs_rd, &loctup, snapshot, buffer);
 			if (valid)
 			{
 				hscan->rs_vistuples[ntup++] = offnum;
@@ -2480,7 +2482,7 @@ SampleHeapTupleVisible(TableScanDesc scan, Buffer buffer,
 	else
 	{
 		/* Otherwise, we have to check the tuple individually. */
-		return HeapTupleSatisfiesVisibility(tuple, scan->rs_snapshot,
+		return HeapTupleSatisfiesVisibility(scan->rs_rd, tuple, scan->rs_snapshot,
 											buffer);
 	}
 }
diff --git a/src/backend/access/heap/heapam_visibility.c b/src/backend/access/heap/heapam_visibility.c
index 537e681..3076f6a 100644
--- a/src/backend/access/heap/heapam_visibility.c
+++ b/src/backend/access/heap/heapam_visibility.c
@@ -77,6 +77,7 @@
 #include "utils/combocid.h"
 #include "utils/snapmgr.h"
 
+static bool TempTupleSatisfiesVisibility(HeapTuple htup, CommandId curcid, Buffer buffer);
 
 /*
  * SetHintBits()
@@ -454,7 +455,7 @@ HeapTupleSatisfiesToast(HeapTuple htup, Snapshot snapshot,
  *	test for it themselves.)
  */
 TM_Result
-HeapTupleSatisfiesUpdate(HeapTuple htup, CommandId curcid,
+HeapTupleSatisfiesUpdate(Relation relation, HeapTuple htup, CommandId curcid,
 						 Buffer buffer)
 {
 	HeapTupleHeader tuple = htup->t_data;
@@ -462,6 +463,13 @@ HeapTupleSatisfiesUpdate(HeapTuple htup, CommandId curcid,
 	Assert(ItemPointerIsValid(&htup->t_self));
 	Assert(htup->t_tableOid != InvalidOid);
 
+	if (relation->rd_rel->relpersistence == RELPERSISTENCE_SESSION && RecoveryInProgress())
+	{
+		AccessTempRelationAtReplica = true;
+		return TempTupleSatisfiesVisibility(htup, curcid, buffer) ? TM_Ok : TM_Invisible;
+	}
+	AccessTempRelationAtReplica = false;
+
 	if (!HeapTupleHeaderXminCommitted(tuple))
 	{
 		if (HeapTupleHeaderXminInvalid(tuple))
@@ -1677,6 +1685,59 @@ HeapTupleSatisfiesHistoricMVCC(HeapTuple htup, Snapshot snapshot,
 }
 
 /*
+ * TempTupleSatisfiesVisibility
+ *		True iff global temp table tuple is visible for the current transaction.
+ *
+ * Temporary tables are visible only for current backend, so there is no need to
+ * handle cases with tuples committed by other backends. We only need to exclude
+ * modifications done by aborted transactions or after start of table scan.
+ *
+ */
+static bool
+TempTupleSatisfiesVisibility(HeapTuple htup, CommandId curcid, Buffer buffer)
+{
+	HeapTupleHeader tuple = htup->t_data;
+	TransactionId xmin;
+	TransactionId xmax;
+
+	Assert(ItemPointerIsValid(&htup->t_self));
+	Assert(htup->t_tableOid != InvalidOid);
+
+	if (HeapTupleHeaderXminInvalid(tuple))
+		return false;
+
+	xmin = HeapTupleHeaderGetRawXmin(tuple);
+
+	if (IsReplicaTransactionAborted(xmin))
+		return false;
+
+	if (IsReplicaCurrentTransactionId(xmin)
+		&& HeapTupleHeaderGetCmin(tuple) >= curcid)
+	{
+		return false;	/* inserted after scan started */
+	}
+
+	if (tuple->t_infomask & HEAP_XMAX_INVALID)	/* xid invalid */
+		return true;
+
+	if (HEAP_XMAX_IS_LOCKED_ONLY(tuple->t_infomask))	/* not deleter */
+		return true;
+
+	xmax = (tuple->t_infomask & HEAP_XMAX_IS_MULTI)
+	    ? HeapTupleGetUpdateXid(tuple)
+		: HeapTupleHeaderGetRawXmax(tuple);
+
+	if (IsReplicaTransactionAborted(xmax))
+		return true; /* updating subtransaction aborted */
+
+	if (!IsReplicaCurrentTransactionId(xmax))
+		return false; /* updating transaction committed */
+
+	return (HeapTupleHeaderGetCmax(tuple) >= curcid);	/* updated after scan started */
+}
+
+
+/*
  * HeapTupleSatisfiesVisibility
  *		True iff heap tuple satisfies a time qual.
  *
@@ -1687,8 +1748,15 @@ HeapTupleSatisfiesHistoricMVCC(HeapTuple htup, Snapshot snapshot,
  *	if so, the indicated buffer is marked dirty.
  */
 bool
-HeapTupleSatisfiesVisibility(HeapTuple tup, Snapshot snapshot, Buffer buffer)
+HeapTupleSatisfiesVisibility(Relation relation, HeapTuple tup, Snapshot snapshot, Buffer buffer)
 {
+	if (relation->rd_rel->relpersistence == RELPERSISTENCE_SESSION && RecoveryInProgress())
+	{
+		AccessTempRelationAtReplica = true;
+		return TempTupleSatisfiesVisibility(tup, snapshot->curcid, buffer);
+	}
+	AccessTempRelationAtReplica = false;
+
 	switch (snapshot->snapshot_type)
 	{
 		case SNAPSHOT_MVCC:
diff --git a/src/backend/access/nbtree/nbtpage.c b/src/backend/access/nbtree/nbtpage.c
index 5962126..bdb6c95 100644
--- a/src/backend/access/nbtree/nbtpage.c
+++ b/src/backend/access/nbtree/nbtpage.c
@@ -763,7 +763,11 @@ _bt_getbuf(Relation rel, BlockNumber blkno, int access)
 		/* Read an existing block of the relation */
 		buf = ReadBuffer(rel, blkno);
 		LockBuffer(buf, access);
-		_bt_checkpage(rel, buf);
+		/* Session temporary relation may be not yet initialized for this backend. */
+		if (blkno == BTREE_METAPAGE && GlobalTempRelationPageIsNotInitialized(rel, BufferGetPage(buf)))
+			_bt_initmetapage(BufferGetPage(buf), P_NONE, 0);
+		else
+			_bt_checkpage(rel, buf);
 	}
 	else
 	{
diff --git a/src/backend/access/spgist/spgutils.c b/src/backend/access/spgist/spgutils.c
index 45472db..a8497a2 100644
--- a/src/backend/access/spgist/spgutils.c
+++ b/src/backend/access/spgist/spgutils.c
@@ -106,6 +106,7 @@ spgGetCache(Relation index)
 		spgConfigIn in;
 		FmgrInfo   *procinfo;
 		Buffer		metabuffer;
+		Page        metapage;
 		SpGistMetaPageData *metadata;
 
 		cache = MemoryContextAllocZero(index->rd_indexcxt,
@@ -155,12 +156,32 @@ spgGetCache(Relation index)
 		metabuffer = ReadBuffer(index, SPGIST_METAPAGE_BLKNO);
 		LockBuffer(metabuffer, BUFFER_LOCK_SHARE);
 
-		metadata = SpGistPageGetMeta(BufferGetPage(metabuffer));
+		metapage = BufferGetPage(metabuffer);
+		metadata = SpGistPageGetMeta(metapage);
 
 		if (metadata->magicNumber != SPGIST_MAGIC_NUMBER)
-			elog(ERROR, "index \"%s\" is not an SP-GiST index",
-				 RelationGetRelationName(index));
+		{
+			if (GlobalTempRelationPageIsNotInitialized(index, metapage))
+			{
+				Buffer rootbuffer = ReadBuffer(index, SPGIST_ROOT_BLKNO);
+				Buffer nullbuffer = ReadBuffer(index, SPGIST_NULL_BLKNO);
+
+				SpGistInitMetapage(metapage);
+
+				LockBuffer(rootbuffer, BUFFER_LOCK_EXCLUSIVE);
+				SpGistInitPage(BufferGetPage(rootbuffer), SPGIST_LEAF);
+				MarkBufferDirty(rootbuffer);
+				UnlockReleaseBuffer(rootbuffer);
 
+				LockBuffer(nullbuffer, BUFFER_LOCK_EXCLUSIVE);
+				SpGistInitPage(BufferGetPage(nullbuffer), SPGIST_LEAF | SPGIST_NULLS);
+				MarkBufferDirty(nullbuffer);
+				UnlockReleaseBuffer(nullbuffer);
+			}
+			else
+				elog(ERROR, "index \"%s\" is not an SP-GiST index",
+					 RelationGetRelationName(index));
+		}
 		cache->lastUsedPages = metadata->lastUsedPages;
 
 		UnlockReleaseBuffer(metabuffer);
diff --git a/src/backend/access/transam/transam.c b/src/backend/access/transam/transam.c
index 365ddfb..bce9c4a 100644
--- a/src/backend/access/transam/transam.c
+++ b/src/backend/access/transam/transam.c
@@ -22,6 +22,7 @@
 #include "access/clog.h"
 #include "access/subtrans.h"
 #include "access/transam.h"
+#include "access/xact.h"
 #include "utils/snapmgr.h"
 
 /*
@@ -126,6 +127,9 @@ TransactionIdDidCommit(TransactionId transactionId)
 {
 	XidStatus	xidstatus;
 
+	if (AccessTempRelationAtReplica)
+		return !IsReplicaCurrentTransactionId(transactionId) && !IsReplicaTransactionAborted(transactionId);
+
 	xidstatus = TransactionLogFetch(transactionId);
 
 	/*
@@ -182,6 +186,9 @@ TransactionIdDidAbort(TransactionId transactionId)
 {
 	XidStatus	xidstatus;
 
+	if (AccessTempRelationAtReplica)
+		return IsReplicaTransactionAborted(transactionId);
+
 	xidstatus = TransactionLogFetch(transactionId);
 
 	/*
diff --git a/src/backend/access/transam/varsup.c b/src/backend/access/transam/varsup.c
index 5b759ec..388faae 100644
--- a/src/backend/access/transam/varsup.c
+++ b/src/backend/access/transam/varsup.c
@@ -71,7 +71,7 @@ GetNewTransactionId(bool isSubXact)
 
 	/* safety check, we should never get this far in a HS standby */
 	if (RecoveryInProgress())
-		elog(ERROR, "cannot assign TransactionIds during recovery");
+   	    elog(ERROR, "cannot assign TransactionIds during recovery");
 
 	LWLockAcquire(XidGenLock, LW_EXCLUSIVE);
 
diff --git a/src/backend/access/transam/xact.c b/src/backend/access/transam/xact.c
index 1bbaeee..ab1bef9 100644
--- a/src/backend/access/transam/xact.c
+++ b/src/backend/access/transam/xact.c
@@ -192,6 +192,7 @@ typedef struct TransactionStateData
 	int			parallelModeLevel;	/* Enter/ExitParallelMode counter */
 	bool		chain;			/* start a new block after this one */
 	struct TransactionStateData *parent;	/* back link to parent */
+	TransactionId replicaTransactionId;    /* pseudo XID for inserting data in global temp tables at replica */
 } TransactionStateData;
 
 typedef TransactionStateData *TransactionState;
@@ -286,6 +287,12 @@ typedef struct XactCallbackItem
 
 static XactCallbackItem *Xact_callbacks = NULL;
 
+static TransactionId replicaTransIdCount = FirstNormalTransactionId;
+static TransactionId replicaTopTransId;
+static Bitmapset*    replicaAbortedXids;
+
+bool AccessTempRelationAtReplica;
+
 /*
  * List of add-on start- and end-of-subxact callbacks
  */
@@ -443,6 +450,48 @@ GetCurrentTransactionIdIfAny(void)
 }
 
 /*
+ * Transactions at replica can update only global temporary tables.
+ * Them are assigned backend-local XIDs which are independent from normal XIDs received from primary node.
+ * So tuples of temporary tables at replica requires special visibility rules.
+ *
+ * XIDs for such transactions at replica are created on demand (when tuple of temp table is updated).
+ * XID wrap-around and adjusting XID horizon is not supported. So number of such transactions at replica is
+ * limited by 2^32 and require up to 2^29 in-memory bitmap for marking aborted transactions.
+  */
+TransactionId
+GetReplicaTransactionId(void)
+{
+	TransactionState s = CurrentTransactionState;
+	if (!TransactionIdIsValid(s->replicaTransactionId))
+		s->replicaTransactionId = ++replicaTransIdCount;
+	return s->replicaTransactionId;
+}
+
+/*
+ * At replica transaction can update only temporary tables
+ * and them are assigned special XIDs (not related with normal XIDs received from primary node).
+ * As far as we see only own transaction it is not necessary to mark committed transactions.
+ * Only marking aborted ones is enough. All transactions which are not marked as aborted are treated as
+ * committed or self in-progress transactions.
+ */
+bool
+IsReplicaTransactionAborted(TransactionId xid)
+{
+	return bms_is_member(xid, replicaAbortedXids);
+}
+
+/*
+ * As far as XIDs for transactions at replica are generated individually for each backends,
+ * we can check that XID belongs to the current transaction or any of its subtransactions by
+ * just comparing it with XID of top transaction.
+ */
+bool
+IsReplicaCurrentTransactionId(TransactionId xid)
+{
+	return xid > replicaTopTransId;
+}
+
+/*
  *	GetTopFullTransactionId
  *
  * This will return the FullTransactionId of the main transaction, assigning
@@ -855,6 +904,9 @@ TransactionIdIsCurrentTransactionId(TransactionId xid)
 {
 	TransactionState s;
 
+	if (AccessTempRelationAtReplica)
+		return IsReplicaCurrentTransactionId(xid);
+
 	/*
 	 * We always say that BootstrapTransactionId is "not my transaction ID"
 	 * even when it is (ie, during bootstrap).  Along with the fact that
@@ -1206,7 +1258,7 @@ static TransactionId
 RecordTransactionCommit(void)
 {
 	TransactionId xid = GetTopTransactionIdIfAny();
-	bool		markXidCommitted = TransactionIdIsValid(xid);
+	bool		markXidCommitted = TransactionIdIsNormal(xid);
 	TransactionId latestXid = InvalidTransactionId;
 	int			nrels;
 	RelFileNode *rels;
@@ -1624,7 +1676,7 @@ RecordTransactionAbort(bool isSubXact)
 	 * rels to delete (note that this routine is not responsible for actually
 	 * deleting 'em).  We cannot have any child XIDs, either.
 	 */
-	if (!TransactionIdIsValid(xid))
+	if (!TransactionIdIsNormal(xid))
 	{
 		/* Reset XactLastRecEnd until the next transaction writes something */
 		if (!isSubXact)
@@ -1892,6 +1944,8 @@ StartTransaction(void)
 	s = &TopTransactionStateData;
 	CurrentTransactionState = s;
 
+	replicaTopTransId = replicaTransIdCount;
+
 	Assert(!FullTransactionIdIsValid(XactTopFullTransactionId));
 
 	/* check the current transaction state */
@@ -1905,6 +1959,7 @@ StartTransaction(void)
 	 */
 	s->state = TRANS_START;
 	s->fullTransactionId = InvalidFullTransactionId;	/* until assigned */
+	s->replicaTransactionId = InvalidTransactionId;	/* until assigned */
 
 	/* Determine if statements are logged in this transaction */
 	xact_is_sampled = log_xact_sample_rate != 0 &&
@@ -2570,6 +2625,14 @@ AbortTransaction(void)
 	/* Prevent cancel/die interrupt while cleaning up */
 	HOLD_INTERRUPTS();
 
+	/* Mark transactions involved global temp table at replica as aborted */
+	if (TransactionIdIsValid(s->replicaTransactionId))
+	{
+		MemoryContext ctx = MemoryContextSwitchTo(TopMemoryContext);
+		replicaAbortedXids = bms_add_member(replicaAbortedXids, s->replicaTransactionId);
+		MemoryContextSwitchTo(ctx);
+	}
+
 	/* Make sure we have a valid memory context and resource owner */
 	AtAbort_Memory();
 	AtAbort_ResourceOwner();
@@ -2991,6 +3054,9 @@ CommitTransactionCommand(void)
 			 * and then clean up.
 			 */
 		case TBLOCK_ABORT_PENDING:
+			if (GetCurrentTransactionIdIfAny() == FrozenTransactionId)
+				elog(FATAL, "Transaction is aborted at standby");
+
 			AbortTransaction();
 			CleanupTransaction();
 			s->blockState = TBLOCK_DEFAULT;
@@ -4856,6 +4922,14 @@ AbortSubTransaction(void)
 	/* Prevent cancel/die interrupt while cleaning up */
 	HOLD_INTERRUPTS();
 
+	/* Mark transactions involved global temp table at replica as aborted */
+	if (TransactionIdIsValid(s->replicaTransactionId))
+	{
+		MemoryContext ctx = MemoryContextSwitchTo(TopMemoryContext);
+		replicaAbortedXids = bms_add_member(replicaAbortedXids, s->replicaTransactionId);
+		MemoryContextSwitchTo(ctx);
+	}
+
 	/* Make sure we have a valid memory context and resource owner */
 	AtSubAbort_Memory();
 	AtSubAbort_ResourceOwner();
diff --git a/src/backend/access/transam/xloginsert.c b/src/backend/access/transam/xloginsert.c
index 3ec67d4..edec8ca 100644
--- a/src/backend/access/transam/xloginsert.c
+++ b/src/backend/access/transam/xloginsert.c
@@ -213,6 +213,7 @@ void
 XLogRegisterBuffer(uint8 block_id, Buffer buffer, uint8 flags)
 {
 	registered_buffer *regbuf;
+	RelFileNodeBackend rnode;
 
 	/* NO_IMAGE doesn't make sense with FORCE_IMAGE */
 	Assert(!((flags & REGBUF_FORCE_IMAGE) && (flags & (REGBUF_NO_IMAGE))));
@@ -227,7 +228,8 @@ XLogRegisterBuffer(uint8 block_id, Buffer buffer, uint8 flags)
 
 	regbuf = &registered_buffers[block_id];
 
-	BufferGetTag(buffer, &regbuf->rnode, &regbuf->forkno, &regbuf->block);
+	BufferGetTag(buffer, &rnode, &regbuf->forkno, &regbuf->block);
+	regbuf->rnode = rnode.node;
 	regbuf->page = BufferGetPage(buffer);
 	regbuf->flags = flags;
 	regbuf->rdata_tail = (XLogRecData *) &regbuf->rdata_head;
@@ -919,7 +921,7 @@ XLogSaveBufferForHint(Buffer buffer, bool buffer_std)
 		int			flags;
 		PGAlignedBlock copied_buffer;
 		char	   *origdata = (char *) BufferGetBlock(buffer);
-		RelFileNode rnode;
+		RelFileNodeBackend rnode;
 		ForkNumber	forkno;
 		BlockNumber blkno;
 
@@ -948,7 +950,7 @@ XLogSaveBufferForHint(Buffer buffer, bool buffer_std)
 			flags |= REGBUF_STANDARD;
 
 		BufferGetTag(buffer, &rnode, &forkno, &blkno);
-		XLogRegisterBlock(0, &rnode, forkno, blkno, copied_buffer.data, flags);
+		XLogRegisterBlock(0, &rnode.node, forkno, blkno, copied_buffer.data, flags);
 
 		recptr = XLogInsert(RM_XLOG_ID, XLOG_FPI_FOR_HINT);
 	}
@@ -1009,7 +1011,7 @@ XLogRecPtr
 log_newpage_buffer(Buffer buffer, bool page_std)
 {
 	Page		page = BufferGetPage(buffer);
-	RelFileNode rnode;
+	RelFileNodeBackend rnode;
 	ForkNumber	forkNum;
 	BlockNumber blkno;
 
@@ -1018,7 +1020,7 @@ log_newpage_buffer(Buffer buffer, bool page_std)
 
 	BufferGetTag(buffer, &rnode, &forkNum, &blkno);
 
-	return log_newpage(&rnode, forkNum, blkno, page, page_std);
+	return log_newpage(&rnode.node, forkNum, blkno, page, page_std);
 }
 
 /*
diff --git a/src/backend/catalog/catalog.c b/src/backend/catalog/catalog.c
index a065419..8814afb 100644
--- a/src/backend/catalog/catalog.c
+++ b/src/backend/catalog/catalog.c
@@ -409,6 +409,9 @@ GetNewRelFileNode(Oid reltablespace, Relation pg_class, char relpersistence)
 		case RELPERSISTENCE_TEMP:
 			backend = BackendIdForTempRelations();
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 99ae159..24b2438 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3612,7 +3612,7 @@ reindex_relation(Oid relid, int flags, int options)
 		if (flags & REINDEX_REL_FORCE_INDEXES_UNLOGGED)
 			persistence = RELPERSISTENCE_UNLOGGED;
 		else if (flags & REINDEX_REL_FORCE_INDEXES_PERMANENT)
-			persistence = RELPERSISTENCE_PERMANENT;
+			persistence = rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ? RELPERSISTENCE_SESSION : RELPERSISTENCE_PERMANENT;
 		else
 			persistence = rel->rd_rel->relpersistence;
 
diff --git a/src/backend/catalog/storage.c b/src/backend/catalog/storage.c
index 3cc886f..a111ddc 100644
--- a/src/backend/catalog/storage.c
+++ b/src/backend/catalog/storage.c
@@ -93,6 +93,10 @@ RelationCreateStorage(RelFileNode rnode, char relpersistence)
 			backend = InvalidBackendId;
 			needs_wal = false;
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			needs_wal = false;
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
 			needs_wal = true;
diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index cedb4ee..d11c5b3 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -1400,7 +1400,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap,
 	 */
 	if (newrelpersistence == RELPERSISTENCE_UNLOGGED)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_UNLOGGED;
-	else if (newrelpersistence == RELPERSISTENCE_PERMANENT)
+	else if (newrelpersistence != RELPERSISTENCE_TEMP)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_PERMANENT;
 
 	/* Report that we are now reindexing relations */
diff --git a/src/backend/commands/sequence.c b/src/backend/commands/sequence.c
index 0960b33..6c3998f 100644
--- a/src/backend/commands/sequence.c
+++ b/src/backend/commands/sequence.c
@@ -94,7 +94,7 @@ static HTAB *seqhashtab = NULL; /* hash table for SeqTable items */
  */
 static SeqTableData *last_used_seq = NULL;
 
-static void fill_seq_with_data(Relation rel, HeapTuple tuple);
+static void fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf);
 static Relation lock_and_open_sequence(SeqTable seq);
 static void create_seq_hashtable(void);
 static void init_sequence(Oid relid, SeqTable *p_elm, Relation *p_rel);
@@ -222,7 +222,7 @@ DefineSequence(ParseState *pstate, CreateSeqStmt *seq)
 
 	/* now initialize the sequence's data */
 	tuple = heap_form_tuple(tupDesc, value, null);
-	fill_seq_with_data(rel, tuple);
+	fill_seq_with_data(rel, tuple, InvalidBuffer);
 
 	/* process OWNED BY if given */
 	if (owned_by)
@@ -327,7 +327,7 @@ ResetSequence(Oid seq_relid)
 	/*
 	 * Insert the modified tuple into the new storage file.
 	 */
-	fill_seq_with_data(seq_rel, tuple);
+	fill_seq_with_data(seq_rel, tuple, InvalidBuffer);
 
 	/* Clear local cache so that we don't think we have cached numbers */
 	/* Note that we do not change the currval() state */
@@ -340,18 +340,21 @@ ResetSequence(Oid seq_relid)
  * Initialize a sequence's relation with the specified tuple as content
  */
 static void
-fill_seq_with_data(Relation rel, HeapTuple tuple)
+fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf)
 {
-	Buffer		buf;
 	Page		page;
 	sequence_magic *sm;
 	OffsetNumber offnum;
+	bool lockBuffer = false;
 
 	/* Initialize first page of relation with special magic number */
 
-	buf = ReadBuffer(rel, P_NEW);
-	Assert(BufferGetBlockNumber(buf) == 0);
-
+	if (buf == InvalidBuffer)
+	{
+		buf = ReadBuffer(rel, P_NEW);
+		Assert(BufferGetBlockNumber(buf) == 0);
+		lockBuffer = true;
+	}
 	page = BufferGetPage(buf);
 
 	PageInit(page, BufferGetPageSize(buf), sizeof(sequence_magic));
@@ -360,7 +363,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	/* Now insert sequence tuple */
 
-	LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
+	if (lockBuffer)
+		LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
 
 	/*
 	 * Since VACUUM does not process sequences, we have to force the tuple to
@@ -410,7 +414,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	END_CRIT_SECTION();
 
-	UnlockReleaseBuffer(buf);
+	if (lockBuffer)
+		UnlockReleaseBuffer(buf);
 }
 
 /*
@@ -502,7 +507,7 @@ AlterSequence(ParseState *pstate, AlterSeqStmt *stmt)
 		/*
 		 * Insert the modified tuple into the new storage file.
 		 */
-		fill_seq_with_data(seqrel, newdatatuple);
+		fill_seq_with_data(seqrel, newdatatuple, InvalidBuffer);
 	}
 
 	/* process OWNED BY if given */
@@ -1178,6 +1183,17 @@ read_seq_tuple(Relation rel, Buffer *buf, HeapTuple seqdatatuple)
 	LockBuffer(*buf, BUFFER_LOCK_EXCLUSIVE);
 
 	page = BufferGetPage(*buf);
+	if (GlobalTempRelationPageIsNotInitialized(rel, page))
+	{
+		/* Initialize sequence for global temporary tables */
+		Datum		value[SEQ_COL_LASTCOL] = {0};
+		bool		null[SEQ_COL_LASTCOL] = {false};
+		HeapTuple tuple;
+		value[SEQ_COL_LASTVAL-1] = Int64GetDatumFast(1); /* start sequence with 1 */
+		tuple = heap_form_tuple(RelationGetDescr(rel), value, null);
+		fill_seq_with_data(rel, tuple, *buf);
+	}
+
 	sm = (sequence_magic *) PageGetSpecialPointer(page);
 
 	if (sm->magic != SEQ_MAGIC)
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index fb2be10..a31f775 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -586,7 +586,7 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 	 * Check consistency of arguments
 	 */
 	if (stmt->oncommit != ONCOMMIT_NOOP
-		&& stmt->relation->relpersistence != RELPERSISTENCE_TEMP)
+		&& !IsLocalRelpersistence(stmt->relation->relpersistence))
 		ereport(ERROR,
 				(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 				 errmsg("ON COMMIT can only be used on temporary tables")));
@@ -1772,7 +1772,8 @@ ExecuteTruncateGuts(List *explicit_rels, List *relids, List *relids_logged,
 		 * table or the current physical file to be thrown away anyway.
 		 */
 		if (rel->rd_createSubid == mySubid ||
-			rel->rd_newRelfilenodeSubid == mySubid)
+			rel->rd_newRelfilenodeSubid == mySubid ||
+			rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
 		{
 			/* Immediate, non-rollbackable truncation is OK */
 			heap_truncate_one_rel(rel);
@@ -7678,6 +7679,12 @@ ATAddForeignKeyConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
 						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 						 errmsg("constraints on unlogged tables may reference only permanent or unlogged tables")));
 			break;
+		case RELPERSISTENCE_SESSION:
+			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
+				ereport(ERROR,
+						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+						 errmsg("constraints on session tables may reference only session tables")));
+			break;
 		case RELPERSISTENCE_TEMP:
 			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_TEMP)
 				ereport(ERROR,
@@ -14082,6 +14089,13 @@ ATPrepChangePersistence(Relation rel, bool toLogged)
 							RelationGetRelationName(rel)),
 					 errtable(rel)));
 			break;
+		case RELPERSISTENCE_SESSION:
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+					 errmsg("cannot change logged status of session table \"%s\"",
+							RelationGetRelationName(rel)),
+					 errtable(rel)));
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			if (toLogged)
 				/* nothing to do */
@@ -14569,14 +14583,7 @@ PreCommit_on_commit_actions(void)
 				/* Do nothing (there shouldn't be such entries, actually) */
 				break;
 			case ONCOMMIT_DELETE_ROWS:
-
-				/*
-				 * If this transaction hasn't accessed any temporary
-				 * relations, we can skip truncating ON COMMIT DELETE ROWS
-				 * tables, as they must still be empty.
-				 */
-				if ((MyXactFlags & XACT_FLAGS_ACCESSEDTEMPNAMESPACE))
-					oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
+				oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
 				break;
 			case ONCOMMIT_DROP:
 				oids_to_drop = lappend_oid(oids_to_drop, oc->relid);
diff --git a/src/backend/executor/execMain.c b/src/backend/executor/execMain.c
index dbd7dd9..efe6f21 100644
--- a/src/backend/executor/execMain.c
+++ b/src/backend/executor/execMain.c
@@ -788,6 +788,9 @@ ExecCheckXactReadOnly(PlannedStmt *plannedstmt)
 		if (isTempNamespace(get_rel_namespace(rte->relid)))
 			continue;
 
+		if (get_rel_persistence(rte->relid) == RELPERSISTENCE_SESSION)
+			continue;
+
 		PreventCommandIfReadOnly(CreateCommandTag((Node *) plannedstmt));
 	}
 
diff --git a/src/backend/optimizer/util/plancat.c b/src/backend/optimizer/util/plancat.c
index 98e9948..1a9170b 100644
--- a/src/backend/optimizer/util/plancat.c
+++ b/src/backend/optimizer/util/plancat.c
@@ -124,7 +124,7 @@ get_relation_info(PlannerInfo *root, Oid relationObjectId, bool inhparent,
 	relation = table_open(relationObjectId, NoLock);
 
 	/* Temporary and unlogged relations are inaccessible during recovery. */
-	if (!RelationNeedsWAL(relation) && RecoveryInProgress())
+	if (!RelationNeedsWAL(relation) && RecoveryInProgress() && relation->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
 		ereport(ERROR,
 				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
 				 errmsg("cannot access temporary or unlogged relations during recovery")));
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index c97bb36..f9b2000 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -3265,20 +3265,11 @@ OptTemp:	TEMPORARY					{ $$ = RELPERSISTENCE_TEMP; }
 			| TEMP						{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMPORARY			{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMP				{ $$ = RELPERSISTENCE_TEMP; }
-			| GLOBAL TEMPORARY
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
-			| GLOBAL TEMP
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
+			| GLOBAL TEMPORARY          { $$ = RELPERSISTENCE_SESSION; }
+			| GLOBAL TEMP               { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION                   { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMPORARY         { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMP              { $$ = RELPERSISTENCE_SESSION; }
 			| UNLOGGED					{ $$ = RELPERSISTENCE_UNLOGGED; }
 			| /*EMPTY*/					{ $$ = RELPERSISTENCE_PERMANENT; }
 		;
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index a9b2f8b..2f261b9 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -437,6 +437,14 @@ generateSerialExtraStmts(CreateStmtContext *cxt, ColumnDef *column,
 	seqstmt->options = seqoptions;
 
 	/*
+	 * Why we should not always use persistence of parent table?
+	 * Although it is prohibited to have unlogged sequences,
+	 * unlogged tables with SERIAL fields are accepted!
+	 */
+	if (cxt->relation->relpersistence != RELPERSISTENCE_UNLOGGED)
+		seqstmt->sequence->relpersistence = cxt->relation->relpersistence;
+
+	/*
 	 * If a sequence data type was specified, add it to the options.  Prepend
 	 * to the list rather than append; in case a user supplied their own AS
 	 * clause, the "redundant options" error will point to their occurrence,
diff --git a/src/backend/postmaster/autovacuum.c b/src/backend/postmaster/autovacuum.c
index 073f313..5760a9c 100644
--- a/src/backend/postmaster/autovacuum.c
+++ b/src/backend/postmaster/autovacuum.c
@@ -2154,7 +2154,7 @@ do_autovacuum(void)
 		/*
 		 * We cannot safely process other backends' temp tables, so skip 'em.
 		 */
-		if (classForm->relpersistence == RELPERSISTENCE_TEMP)
+		if (IsLocalRelpersistence(classForm->relpersistence))
 			continue;
 
 		relid = classForm->oid;
diff --git a/src/backend/replication/logical/reorderbuffer.c b/src/backend/replication/logical/reorderbuffer.c
index e8ffa04..2004d2f 100644
--- a/src/backend/replication/logical/reorderbuffer.c
+++ b/src/backend/replication/logical/reorderbuffer.c
@@ -3483,6 +3483,7 @@ ResolveCminCmaxDuringDecoding(HTAB *tuplecid_data,
 {
 	ReorderBufferTupleCidKey key;
 	ReorderBufferTupleCidEnt *ent;
+	RelFileNodeBackend rnode;
 	ForkNumber	forkno;
 	BlockNumber blockno;
 	bool		updated_mapping = false;
@@ -3496,7 +3497,8 @@ ResolveCminCmaxDuringDecoding(HTAB *tuplecid_data,
 	 * get relfilenode from the buffer, no convenient way to access it other
 	 * than that.
 	 */
-	BufferGetTag(buffer, &key.relnode, &forkno, &blockno);
+	BufferGetTag(buffer, &rnode, &forkno, &blockno);
+	key.relnode = rnode.node;
 
 	/* tuples can only be in the main fork */
 	Assert(forkno == MAIN_FORKNUM);
diff --git a/src/backend/storage/buffer/bufmgr.c b/src/backend/storage/buffer/bufmgr.c
index 6f3a402..76ce953 100644
--- a/src/backend/storage/buffer/bufmgr.c
+++ b/src/backend/storage/buffer/bufmgr.c
@@ -556,7 +556,7 @@ PrefetchBuffer(Relation reln, ForkNumber forkNum, BlockNumber blockNum)
 		int			buf_id;
 
 		/* create a tag so we can lookup the buffer */
-		INIT_BUFFERTAG(newTag, reln->rd_smgr->smgr_rnode.node,
+		INIT_BUFFERTAG(newTag, reln->rd_smgr->smgr_rnode,
 					   forkNum, blockNum);
 
 		/* determine its hash code and partition lock ID */
@@ -710,7 +710,7 @@ ReadBuffer_common(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
 	Block		bufBlock;
 	bool		found;
 	bool		isExtend;
-	bool		isLocalBuf = SmgrIsTemp(smgr);
+	bool		isLocalBuf = SmgrIsTemp(smgr) && relpersistence == RELPERSISTENCE_TEMP;
 
 	*hit = false;
 
@@ -1010,7 +1010,7 @@ BufferAlloc(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
 	uint32		buf_state;
 
 	/* create a tag so we can lookup the buffer */
-	INIT_BUFFERTAG(newTag, smgr->smgr_rnode.node, forkNum, blockNum);
+	INIT_BUFFERTAG(newTag, smgr->smgr_rnode, forkNum, blockNum);
 
 	/* determine its hash code and partition lock ID */
 	newHash = BufTableHashCode(&newTag);
@@ -1532,7 +1532,8 @@ ReleaseAndReadBuffer(Buffer buffer,
 		{
 			bufHdr = GetLocalBufferDescriptor(-buffer - 1);
 			if (bufHdr->tag.blockNum == blockNum &&
-				RelFileNodeEquals(bufHdr->tag.rnode, relation->rd_node) &&
+				RelFileNodeEquals(bufHdr->tag.rnode.node, relation->rd_node) &&
+				bufHdr->tag.rnode.backend == relation->rd_backend &&
 				bufHdr->tag.forkNum == forkNum)
 				return buffer;
 			ResourceOwnerForgetBuffer(CurrentResourceOwner, buffer);
@@ -1543,7 +1544,8 @@ ReleaseAndReadBuffer(Buffer buffer,
 			bufHdr = GetBufferDescriptor(buffer - 1);
 			/* we have pin, so it's ok to examine tag without spinlock */
 			if (bufHdr->tag.blockNum == blockNum &&
-				RelFileNodeEquals(bufHdr->tag.rnode, relation->rd_node) &&
+				RelFileNodeEquals(bufHdr->tag.rnode.node, relation->rd_node) &&
+				bufHdr->tag.rnode.backend == relation->rd_backend &&
 				bufHdr->tag.forkNum == forkNum)
 				return buffer;
 			UnpinBuffer(bufHdr, true);
@@ -1845,8 +1847,8 @@ BufferSync(int flags)
 
 			item = &CkptBufferIds[num_to_scan++];
 			item->buf_id = buf_id;
-			item->tsId = bufHdr->tag.rnode.spcNode;
-			item->relNode = bufHdr->tag.rnode.relNode;
+			item->tsId = bufHdr->tag.rnode.node.spcNode;
+			item->relNode = bufHdr->tag.rnode.node.relNode;
 			item->forkNum = bufHdr->tag.forkNum;
 			item->blockNum = bufHdr->tag.blockNum;
 		}
@@ -2559,7 +2561,7 @@ PrintBufferLeakWarning(Buffer buffer)
 	}
 
 	/* theoretically we should lock the bufhdr here */
-	path = relpathbackend(buf->tag.rnode, backend, buf->tag.forkNum);
+	path = relpathbackend(buf->tag.rnode.node, backend, buf->tag.forkNum);
 	buf_state = pg_atomic_read_u32(&buf->state);
 	elog(WARNING,
 		 "buffer refcount leak: [%03d] "
@@ -2631,7 +2633,7 @@ BufferGetBlockNumber(Buffer buffer)
  *		a buffer.
  */
 void
-BufferGetTag(Buffer buffer, RelFileNode *rnode, ForkNumber *forknum,
+BufferGetTag(Buffer buffer, RelFileNodeBackend *rnode, ForkNumber *forknum,
 			 BlockNumber *blknum)
 {
 	BufferDesc *bufHdr;
@@ -2696,7 +2698,7 @@ FlushBuffer(BufferDesc *buf, SMgrRelation reln)
 
 	/* Find smgr relation for buffer */
 	if (reln == NULL)
-		reln = smgropen(buf->tag.rnode, InvalidBackendId);
+		reln = smgropen(buf->tag.rnode.node, buf->tag.rnode.backend);
 
 	TRACE_POSTGRESQL_BUFFER_FLUSH_START(buf->tag.forkNum,
 										buf->tag.blockNum,
@@ -2930,7 +2932,7 @@ DropRelFileNodeBuffers(RelFileNodeBackend rnode, ForkNumber forkNum,
 	int			i;
 
 	/* If it's a local relation, it's localbuf.c's problem. */
-	if (RelFileNodeBackendIsTemp(rnode))
+	if (RelFileNodeBackendIsLocalTemp(rnode))
 	{
 		if (rnode.backend == MyBackendId)
 			DropRelFileNodeLocalBuffers(rnode.node, forkNum, firstDelBlock);
@@ -2958,11 +2960,11 @@ DropRelFileNodeBuffers(RelFileNodeBackend rnode, ForkNumber forkNum,
 		 * We could check forkNum and blockNum as well as the rnode, but the
 		 * incremental win from doing so seems small.
 		 */
-		if (!RelFileNodeEquals(bufHdr->tag.rnode, rnode.node))
+		if (!RelFileNodeBackendEquals(bufHdr->tag.rnode, rnode))
 			continue;
 
 		buf_state = LockBufHdr(bufHdr);
-		if (RelFileNodeEquals(bufHdr->tag.rnode, rnode.node) &&
+		if (RelFileNodeBackendEquals(bufHdr->tag.rnode, rnode) &&
 			bufHdr->tag.forkNum == forkNum &&
 			bufHdr->tag.blockNum >= firstDelBlock)
 			InvalidateBuffer(bufHdr);	/* releases spinlock */
@@ -2985,24 +2987,24 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 {
 	int			i,
 				n = 0;
-	RelFileNode *nodes;
+	RelFileNodeBackend *nodes;
 	bool		use_bsearch;
 
 	if (nnodes == 0)
 		return;
 
-	nodes = palloc(sizeof(RelFileNode) * nnodes);	/* non-local relations */
+	nodes = palloc(sizeof(RelFileNodeBackend) * nnodes);	/* non-local relations */
 
 	/* If it's a local relation, it's localbuf.c's problem. */
 	for (i = 0; i < nnodes; i++)
 	{
-		if (RelFileNodeBackendIsTemp(rnodes[i]))
+		if (RelFileNodeBackendIsLocalTemp(rnodes[i]))
 		{
 			if (rnodes[i].backend == MyBackendId)
 				DropRelFileNodeAllLocalBuffers(rnodes[i].node);
 		}
 		else
-			nodes[n++] = rnodes[i].node;
+			nodes[n++] = rnodes[i];
 	}
 
 	/*
@@ -3025,11 +3027,11 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 
 	/* sort the list of rnodes if necessary */
 	if (use_bsearch)
-		pg_qsort(nodes, n, sizeof(RelFileNode), rnode_comparator);
+		pg_qsort(nodes, n, sizeof(RelFileNodeBackend), rnode_comparator);
 
 	for (i = 0; i < NBuffers; i++)
 	{
-		RelFileNode *rnode = NULL;
+		RelFileNodeBackend *rnode = NULL;
 		BufferDesc *bufHdr = GetBufferDescriptor(i);
 		uint32		buf_state;
 
@@ -3044,7 +3046,7 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 
 			for (j = 0; j < n; j++)
 			{
-				if (RelFileNodeEquals(bufHdr->tag.rnode, nodes[j]))
+				if (RelFileNodeBackendEquals(bufHdr->tag.rnode, nodes[j]))
 				{
 					rnode = &nodes[j];
 					break;
@@ -3054,7 +3056,7 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 		else
 		{
 			rnode = bsearch((const void *) &(bufHdr->tag.rnode),
-							nodes, n, sizeof(RelFileNode),
+							nodes, n, sizeof(RelFileNodeBackend),
 							rnode_comparator);
 		}
 
@@ -3063,7 +3065,7 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 			continue;
 
 		buf_state = LockBufHdr(bufHdr);
-		if (RelFileNodeEquals(bufHdr->tag.rnode, (*rnode)))
+		if (RelFileNodeBackendEquals(bufHdr->tag.rnode, (*rnode)))
 			InvalidateBuffer(bufHdr);	/* releases spinlock */
 		else
 			UnlockBufHdr(bufHdr, buf_state);
@@ -3102,11 +3104,11 @@ DropDatabaseBuffers(Oid dbid)
 		 * As in DropRelFileNodeBuffers, an unlocked precheck should be safe
 		 * and saves some cycles.
 		 */
-		if (bufHdr->tag.rnode.dbNode != dbid)
+		if (bufHdr->tag.rnode.node.dbNode != dbid)
 			continue;
 
 		buf_state = LockBufHdr(bufHdr);
-		if (bufHdr->tag.rnode.dbNode == dbid)
+		if (bufHdr->tag.rnode.node.dbNode == dbid)
 			InvalidateBuffer(bufHdr);	/* releases spinlock */
 		else
 			UnlockBufHdr(bufHdr, buf_state);
@@ -3136,7 +3138,7 @@ PrintBufferDescs(void)
 			 "[%02d] (freeNext=%d, rel=%s, "
 			 "blockNum=%u, flags=0x%x, refcount=%u %d)",
 			 i, buf->freeNext,
-			 relpathbackend(buf->tag.rnode, InvalidBackendId, buf->tag.forkNum),
+			 relpath(buf->tag.rnode, buf->tag.forkNum),
 			 buf->tag.blockNum, buf->flags,
 			 buf->refcount, GetPrivateRefCount(b));
 	}
@@ -3204,7 +3206,8 @@ FlushRelationBuffers(Relation rel)
 			uint32		buf_state;
 
 			bufHdr = GetLocalBufferDescriptor(i);
-			if (RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node) &&
+			if (RelFileNodeEquals(bufHdr->tag.rnode.node, rel->rd_node) &&
+				bufHdr->tag.rnode.backend == rel->rd_backend &&
 				((buf_state = pg_atomic_read_u32(&bufHdr->state)) &
 				 (BM_VALID | BM_DIRTY)) == (BM_VALID | BM_DIRTY))
 			{
@@ -3251,13 +3254,15 @@ FlushRelationBuffers(Relation rel)
 		 * As in DropRelFileNodeBuffers, an unlocked precheck should be safe
 		 * and saves some cycles.
 		 */
-		if (!RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node))
+		if (!RelFileNodeEquals(bufHdr->tag.rnode.node, rel->rd_node)
+			|| bufHdr->tag.rnode.backend != rel->rd_backend)
 			continue;
 
 		ReservePrivateRefCountEntry();
 
 		buf_state = LockBufHdr(bufHdr);
-		if (RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node) &&
+		if (RelFileNodeEquals(bufHdr->tag.rnode.node, rel->rd_node) &&
+			bufHdr->tag.rnode.backend == rel->rd_backend &&
 			(buf_state & (BM_VALID | BM_DIRTY)) == (BM_VALID | BM_DIRTY))
 		{
 			PinBuffer_Locked(bufHdr);
@@ -3305,13 +3310,13 @@ FlushDatabaseBuffers(Oid dbid)
 		 * As in DropRelFileNodeBuffers, an unlocked precheck should be safe
 		 * and saves some cycles.
 		 */
-		if (bufHdr->tag.rnode.dbNode != dbid)
+		if (bufHdr->tag.rnode.node.dbNode != dbid)
 			continue;
 
 		ReservePrivateRefCountEntry();
 
 		buf_state = LockBufHdr(bufHdr);
-		if (bufHdr->tag.rnode.dbNode == dbid &&
+		if (bufHdr->tag.rnode.node.dbNode == dbid &&
 			(buf_state & (BM_VALID | BM_DIRTY)) == (BM_VALID | BM_DIRTY))
 		{
 			PinBuffer_Locked(bufHdr);
@@ -4051,7 +4056,7 @@ AbortBufferIO(void)
 				/* Buffer is pinned, so we can read tag without spinlock */
 				char	   *path;
 
-				path = relpathperm(buf->tag.rnode, buf->tag.forkNum);
+				path = relpath(buf->tag.rnode, buf->tag.forkNum);
 				ereport(WARNING,
 						(errcode(ERRCODE_IO_ERROR),
 						 errmsg("could not write block %u of %s",
@@ -4075,7 +4080,7 @@ shared_buffer_write_error_callback(void *arg)
 	/* Buffer is pinned, so we can read the tag without locking the spinlock */
 	if (bufHdr != NULL)
 	{
-		char	   *path = relpathperm(bufHdr->tag.rnode, bufHdr->tag.forkNum);
+		char	   *path = relpath(bufHdr->tag.rnode, bufHdr->tag.forkNum);
 
 		errcontext("writing block %u of relation %s",
 				   bufHdr->tag.blockNum, path);
@@ -4093,7 +4098,7 @@ local_buffer_write_error_callback(void *arg)
 
 	if (bufHdr != NULL)
 	{
-		char	   *path = relpathbackend(bufHdr->tag.rnode, MyBackendId,
+		char	   *path = relpathbackend(bufHdr->tag.rnode.node, MyBackendId,
 										  bufHdr->tag.forkNum);
 
 		errcontext("writing block %u of relation %s",
@@ -4108,22 +4113,27 @@ local_buffer_write_error_callback(void *arg)
 static int
 rnode_comparator(const void *p1, const void *p2)
 {
-	RelFileNode n1 = *(const RelFileNode *) p1;
-	RelFileNode n2 = *(const RelFileNode *) p2;
+	RelFileNodeBackend n1 = *(const RelFileNodeBackend *) p1;
+	RelFileNodeBackend n2 = *(const RelFileNodeBackend *) p2;
 
-	if (n1.relNode < n2.relNode)
+	if (n1.node.relNode < n2.node.relNode)
 		return -1;
-	else if (n1.relNode > n2.relNode)
+	else if (n1.node.relNode > n2.node.relNode)
 		return 1;
 
-	if (n1.dbNode < n2.dbNode)
+	if (n1.node.dbNode < n2.node.dbNode)
 		return -1;
-	else if (n1.dbNode > n2.dbNode)
+	else if (n1.node.dbNode > n2.node.dbNode)
 		return 1;
 
-	if (n1.spcNode < n2.spcNode)
+	if (n1.node.spcNode < n2.node.spcNode)
 		return -1;
-	else if (n1.spcNode > n2.spcNode)
+	else if (n1.node.spcNode > n2.node.spcNode)
+		return 1;
+
+	if (n1.backend < n2.backend)
+		return -1;
+	else if (n1.backend > n2.backend)
 		return 1;
 	else
 		return 0;
@@ -4359,7 +4369,7 @@ IssuePendingWritebacks(WritebackContext *context)
 			next = &context->pending_writebacks[i + ahead + 1];
 
 			/* different file, stop */
-			if (!RelFileNodeEquals(cur->tag.rnode, next->tag.rnode) ||
+			if (!RelFileNodeBackendEquals(cur->tag.rnode, next->tag.rnode) ||
 				cur->tag.forkNum != next->tag.forkNum)
 				break;
 
@@ -4378,7 +4388,7 @@ IssuePendingWritebacks(WritebackContext *context)
 		i += ahead;
 
 		/* and finally tell the kernel to write the data to storage */
-		reln = smgropen(tag.rnode, InvalidBackendId);
+		reln = smgropen(tag.rnode.node, tag.rnode.backend);
 		smgrwriteback(reln, tag.forkNum, tag.blockNum, nblocks);
 	}
 
diff --git a/src/backend/storage/buffer/localbuf.c b/src/backend/storage/buffer/localbuf.c
index f5f6a29..6bd5ecb 100644
--- a/src/backend/storage/buffer/localbuf.c
+++ b/src/backend/storage/buffer/localbuf.c
@@ -68,7 +68,7 @@ LocalPrefetchBuffer(SMgrRelation smgr, ForkNumber forkNum,
 	BufferTag	newTag;			/* identity of requested block */
 	LocalBufferLookupEnt *hresult;
 
-	INIT_BUFFERTAG(newTag, smgr->smgr_rnode.node, forkNum, blockNum);
+	INIT_BUFFERTAG(newTag, smgr->smgr_rnode, forkNum, blockNum);
 
 	/* Initialize local buffers if first request in this session */
 	if (LocalBufHash == NULL)
@@ -111,7 +111,7 @@ LocalBufferAlloc(SMgrRelation smgr, ForkNumber forkNum, BlockNumber blockNum,
 	bool		found;
 	uint32		buf_state;
 
-	INIT_BUFFERTAG(newTag, smgr->smgr_rnode.node, forkNum, blockNum);
+	INIT_BUFFERTAG(newTag, smgr->smgr_rnode, forkNum, blockNum);
 
 	/* Initialize local buffers if first request in this session */
 	if (LocalBufHash == NULL)
@@ -209,7 +209,7 @@ LocalBufferAlloc(SMgrRelation smgr, ForkNumber forkNum, BlockNumber blockNum,
 		Page		localpage = (char *) LocalBufHdrGetBlock(bufHdr);
 
 		/* Find smgr relation for buffer */
-		oreln = smgropen(bufHdr->tag.rnode, MyBackendId);
+		oreln = smgropen(bufHdr->tag.rnode.node, MyBackendId);
 
 		PageSetChecksumInplace(localpage, bufHdr->tag.blockNum);
 
@@ -331,14 +331,14 @@ DropRelFileNodeLocalBuffers(RelFileNode rnode, ForkNumber forkNum,
 		buf_state = pg_atomic_read_u32(&bufHdr->state);
 
 		if ((buf_state & BM_TAG_VALID) &&
-			RelFileNodeEquals(bufHdr->tag.rnode, rnode) &&
+			RelFileNodeEquals(bufHdr->tag.rnode.node, rnode) &&
 			bufHdr->tag.forkNum == forkNum &&
 			bufHdr->tag.blockNum >= firstDelBlock)
 		{
 			if (LocalRefCount[i] != 0)
 				elog(ERROR, "block %u of %s is still referenced (local %u)",
 					 bufHdr->tag.blockNum,
-					 relpathbackend(bufHdr->tag.rnode, MyBackendId,
+					 relpathbackend(bufHdr->tag.rnode.node, MyBackendId,
 									bufHdr->tag.forkNum),
 					 LocalRefCount[i]);
 			/* Remove entry from hashtable */
@@ -377,12 +377,12 @@ DropRelFileNodeAllLocalBuffers(RelFileNode rnode)
 		buf_state = pg_atomic_read_u32(&bufHdr->state);
 
 		if ((buf_state & BM_TAG_VALID) &&
-			RelFileNodeEquals(bufHdr->tag.rnode, rnode))
+			RelFileNodeEquals(bufHdr->tag.rnode.node, rnode))
 		{
 			if (LocalRefCount[i] != 0)
 				elog(ERROR, "block %u of %s is still referenced (local %u)",
 					 bufHdr->tag.blockNum,
-					 relpathbackend(bufHdr->tag.rnode, MyBackendId,
+					 relpathbackend(bufHdr->tag.rnode.node, MyBackendId,
 									bufHdr->tag.forkNum),
 					 LocalRefCount[i]);
 			/* Remove entry from hashtable */
diff --git a/src/backend/storage/freespace/fsmpage.c b/src/backend/storage/freespace/fsmpage.c
index cf7f03f..65eb422 100644
--- a/src/backend/storage/freespace/fsmpage.c
+++ b/src/backend/storage/freespace/fsmpage.c
@@ -268,13 +268,13 @@ restart:
 			 *
 			 * Fix the corruption and restart.
 			 */
-			RelFileNode rnode;
+			RelFileNodeBackend rnode;
 			ForkNumber	forknum;
 			BlockNumber blknum;
 
 			BufferGetTag(buf, &rnode, &forknum, &blknum);
 			elog(DEBUG1, "fixing corrupt FSM block %u, relation %u/%u/%u",
-				 blknum, rnode.spcNode, rnode.dbNode, rnode.relNode);
+				 blknum, rnode.node.spcNode, rnode.node.dbNode, rnode.node.relNode);
 
 			/* make sure we hold an exclusive lock */
 			if (!exclusive_lock_held)
diff --git a/src/backend/storage/ipc/procarray.c b/src/backend/storage/ipc/procarray.c
index fadab62..055ec6b 100644
--- a/src/backend/storage/ipc/procarray.c
+++ b/src/backend/storage/ipc/procarray.c
@@ -994,6 +994,9 @@ TransactionIdIsInProgress(TransactionId xid)
 	int			i,
 				j;
 
+	if (AccessTempRelationAtReplica)
+		return IsReplicaCurrentTransactionId(xid) && !IsReplicaTransactionAborted(xid);
+
 	/*
 	 * Don't bother checking a transaction older than RecentXmin; it could not
 	 * possibly still be running.  (Note: in particular, this guarantees that
diff --git a/src/backend/storage/smgr/md.c b/src/backend/storage/smgr/md.c
index 07f3c93..204c4cb 100644
--- a/src/backend/storage/smgr/md.c
+++ b/src/backend/storage/smgr/md.c
@@ -33,6 +33,7 @@
 #include "postmaster/bgwriter.h"
 #include "storage/fd.h"
 #include "storage/bufmgr.h"
+#include "storage/ipc.h"
 #include "storage/md.h"
 #include "storage/relfilenode.h"
 #include "storage/smgr.h"
@@ -87,6 +88,18 @@ typedef struct _MdfdVec
 
 static MemoryContext MdCxt;		/* context for all MdfdVec objects */
 
+/*
+ * Structure used to collect information created by this backend.
+ * Data of this related should be deleted on backend exit.
+ */
+typedef struct SessionRelation
+{
+	RelFileNodeBackend rnode;
+	struct SessionRelation* next;
+} SessionRelation;
+
+
+static SessionRelation* SessionRelations;
 
 /* Populate a file tag describing an md.c segment file. */
 #define INIT_MD_FILETAG(a,xx_rnode,xx_forknum,xx_segno) \
@@ -152,6 +165,48 @@ mdinit(void)
 								  ALLOCSET_DEFAULT_SIZES);
 }
 
+
+/*
+ * Delete all data of session relations and remove their pages from shared buffers.
+ * This function is called on backend exit.
+ */
+static void
+TruncateSessionRelations(int code, Datum arg)
+{
+	SessionRelation* rel;
+	for (rel = SessionRelations; rel != NULL; rel = rel->next)
+	{
+		/* Remove relation pages from shared buffers */
+		DropRelFileNodesAllBuffers(&rel->rnode, 1);
+
+		/* Delete relation files */
+		mdunlink(rel->rnode, InvalidForkNumber, false);
+	}
+}
+
+/*
+ * Maintain information about session relations accessed by this backend.
+ * This list is needed to perform cleanup on backend exit.
+ * Session relation is linked in this list when this relation is created or opened and file doesn't exist.
+ * Such procedure guarantee that each relation is linked into list only once.
+ */
+static void
+RegisterSessionRelation(SMgrRelation reln)
+{
+	SessionRelation* rel = (SessionRelation*)MemoryContextAlloc(TopMemoryContext, sizeof(SessionRelation));
+
+	/*
+	 * Perform session relation cleanup on backend exit. We are using shared memory hook, because
+	 * cleanup should be performed before backend is disconnected from shared memory.
+	 */
+	if (SessionRelations == NULL)
+		on_shmem_exit(TruncateSessionRelations, 0);
+
+	rel->rnode = reln->smgr_rnode;
+	rel->next = SessionRelations;
+	SessionRelations = rel;
+}
+
 /*
  *	mdexists() -- Does the physical file exist?
  *
@@ -218,6 +273,8 @@ mdcreate(SMgrRelation reln, ForkNumber forkNum, bool isRedo)
 					 errmsg("could not create file \"%s\": %m", path)));
 		}
 	}
+	if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		RegisterSessionRelation(reln);
 
 	pfree(path);
 
@@ -465,6 +522,19 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 
 	if (fd < 0)
 	{
+		/*
+		 * In case of session relation access, there may be no yet files of this relation for this backend.
+		 * If so, then create file and register session relation for truncation on backend exit.
+		 */
+		if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
+			fd = PathNameOpenFile(path, O_RDWR | PG_BINARY | O_CREAT);
+			if (fd >= 0)
+			{
+				RegisterSessionRelation(reln);
+				goto NewSegment;
+			}
+		}
 		if ((behavior & EXTENSION_RETURN_NULL) &&
 			FILE_POSSIBLY_DELETED(errno))
 		{
@@ -476,6 +546,7 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 				 errmsg("could not open file \"%s\": %m", path)));
 	}
 
+  NewSegment:
 	pfree(path);
 
 	_fdvec_resize(reln, forknum, 1);
@@ -652,8 +723,13 @@ mdread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
 		 * complaining.  This allows, for example, the case of trying to
 		 * update a block that was later truncated away.
 		 */
-		if (zero_damaged_pages || InRecovery)
+		if (zero_damaged_pages || InRecovery || RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
 			MemSet(buffer, 0, BLCKSZ);
+			/* In case of session relation we need to write zero page to provide correct result of subsequent mdnblocks */
+			if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+				mdwrite(reln, forknum, blocknum, buffer, true);
+		}
 		else
 			ereport(ERROR,
 					(errcode(ERRCODE_DATA_CORRUPTED),
@@ -738,12 +814,18 @@ mdwrite(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
 BlockNumber
 mdnblocks(SMgrRelation reln, ForkNumber forknum)
 {
-	MdfdVec    *v = mdopenfork(reln, forknum, EXTENSION_FAIL);
+	/*
+	 * If we access session relation, there may be no files yet of this relation for this backend.
+	 * Pass EXTENSION_RETURN_NULL to make mdopen return NULL in this case instead of reporting error.
+	 */
+	MdfdVec    *v = mdopenfork(reln, forknum, RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode)
+							   ? EXTENSION_RETURN_NULL : EXTENSION_FAIL);
 	BlockNumber nblocks;
 	BlockNumber segno = 0;
 
 	/* mdopen has opened the first segment */
-	Assert(reln->md_num_open_segs[forknum] > 0);
+	if (reln->md_num_open_segs[forknum] == 0)
+		return 0;
 
 	/*
 	 * Start from the last open segments, to avoid redundant seeks.  We have
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index a87e721..2401361 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -994,6 +994,9 @@ pg_relation_filepath(PG_FUNCTION_ARGS)
 	/* Determine owning backend. */
 	switch (relform->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c
index 2488607..86e8fca 100644
--- a/src/backend/utils/cache/relcache.c
+++ b/src/backend/utils/cache/relcache.c
@@ -1098,6 +1098,10 @@ RelationBuildDesc(Oid targetRelId, bool insertIt)
 	relation->rd_newRelfilenodeSubid = InvalidSubTransactionId;
 	switch (relation->rd_rel->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			relation->rd_backend = BackendIdForSessionRelations();
+			relation->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			relation->rd_backend = InvalidBackendId;
@@ -3301,6 +3305,10 @@ RelationBuildLocalRelation(const char *relname,
 	rel->rd_rel->relpersistence = relpersistence;
 	switch (relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			rel->rd_backend = BackendIdForSessionRelations();
+			rel->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			rel->rd_backend = InvalidBackendId;
diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
index 0cc9ede..1dff0c8 100644
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -15593,8 +15593,8 @@ dumpTableSchema(Archive *fout, TableInfo *tbinfo)
 											 tbinfo->dobj.catId.oid, false);
 
 		appendPQExpBuffer(q, "CREATE %s%s %s",
-						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ?
-						  "UNLOGGED " : "",
+						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ? "UNLOGGED "
+						  : tbinfo->relpersistence == RELPERSISTENCE_SESSION ? "SESSION " : "",
 						  reltypename,
 						  qualrelname);
 
diff --git a/src/common/relpath.c b/src/common/relpath.c
index 62b9553..cef99d2 100644
--- a/src/common/relpath.c
+++ b/src/common/relpath.c
@@ -166,7 +166,18 @@ GetRelationPath(Oid dbNode, Oid spcNode, Oid relNode,
 		}
 		else
 		{
-			if (forkNumber != MAIN_FORKNUM)
+			/*
+			 * Session relations are distinguished from local temp relations by adding
+			 * SessionRelFirstBackendId offset to backendId.
+			 * These is no need to separate them at file system level, so just subtract SessionRelFirstBackendId
+			 * to avoid too long file names.
+			 * Segments of session relations have the same prefix (t%d_) as local temporary relations
+			 * to make it possible to cleanup them in the same way as local temporary relation files.
+			 */
+			 if (backendId >= SessionRelFirstBackendId)
+				 backendId -= SessionRelFirstBackendId;
+
+			 if (forkNumber != MAIN_FORKNUM)
 				path = psprintf("base/%u/t%d_%u_%s",
 								dbNode, backendId, relNode,
 								forkNames[forkNumber]);
diff --git a/src/include/access/heapam.h b/src/include/access/heapam.h
index 858bcb6..2f16c58 100644
--- a/src/include/access/heapam.h
+++ b/src/include/access/heapam.h
@@ -195,9 +195,9 @@ extern void heap_vacuum_rel(Relation onerel,
 							struct VacuumParams *params, BufferAccessStrategy bstrategy);
 
 /* in heap/heapam_visibility.c */
-extern bool HeapTupleSatisfiesVisibility(HeapTuple stup, Snapshot snapshot,
+extern bool HeapTupleSatisfiesVisibility(Relation relation, HeapTuple stup, Snapshot snapshot,
 										 Buffer buffer);
-extern TM_Result HeapTupleSatisfiesUpdate(HeapTuple stup, CommandId curcid,
+extern TM_Result HeapTupleSatisfiesUpdate(Relation relation, HeapTuple stup, CommandId curcid,
 										  Buffer buffer);
 extern HTSV_Result HeapTupleSatisfiesVacuum(HeapTuple stup, TransactionId OldestXmin,
 											Buffer buffer);
diff --git a/src/include/access/xact.h b/src/include/access/xact.h
index d714551..cbe6760 100644
--- a/src/include/access/xact.h
+++ b/src/include/access/xact.h
@@ -41,6 +41,9 @@
 extern int	DefaultXactIsoLevel;
 extern PGDLLIMPORT int XactIsoLevel;
 
+extern bool AccessTempRelationAtReplica;
+
+
 /*
  * We implement three isolation levels internally.
  * The two stronger ones use one snapshot per database transaction;
@@ -440,4 +443,8 @@ extern void EnterParallelMode(void);
 extern void ExitParallelMode(void);
 extern bool IsInParallelMode(void);
 
+extern TransactionId GetReplicaTransactionId(void);
+extern bool IsReplicaTransactionAborted(TransactionId xid);
+extern bool IsReplicaCurrentTransactionId(TransactionId xid);
+
 #endif							/* XACT_H */
diff --git a/src/include/catalog/pg_class.h b/src/include/catalog/pg_class.h
index 090b6ba..6a39663 100644
--- a/src/include/catalog/pg_class.h
+++ b/src/include/catalog/pg_class.h
@@ -165,6 +165,7 @@ typedef FormData_pg_class *Form_pg_class;
 #define		  RELPERSISTENCE_PERMANENT	'p' /* regular table */
 #define		  RELPERSISTENCE_UNLOGGED	'u' /* unlogged permanent table */
 #define		  RELPERSISTENCE_TEMP		't' /* temporary table */
+#define		  RELPERSISTENCE_SESSION	's' /* session table */
 
 /* default selection for replica identity (primary key or nothing) */
 #define		  REPLICA_IDENTITY_DEFAULT	'd'
diff --git a/src/include/storage/backendid.h b/src/include/storage/backendid.h
index 70ef8eb..f226e7c 100644
--- a/src/include/storage/backendid.h
+++ b/src/include/storage/backendid.h
@@ -22,6 +22,13 @@ typedef int BackendId;			/* unique currently active backend identifier */
 
 #define InvalidBackendId		(-1)
 
+/*
+ * We need to distinguish local and global temporary relations by RelFileNodeBackend.
+ * The least invasive change is to add some special bias value to backend id (since 
+ * maximal number of backed is limited by MaxBackends).
+ */
+#define SessionRelFirstBackendId (0x40000000)
+
 extern PGDLLIMPORT BackendId MyBackendId;	/* backend id of this backend */
 
 /* backend id of our parallel session leader, or InvalidBackendId if none */
@@ -34,4 +41,10 @@ extern PGDLLIMPORT BackendId ParallelMasterBackendId;
 #define BackendIdForTempRelations() \
 	(ParallelMasterBackendId == InvalidBackendId ? MyBackendId : ParallelMasterBackendId)
 
+
+#define BackendIdForSessionRelations() \
+	(BackendIdForTempRelations() + SessionRelFirstBackendId)
+
+#define IsSessionRelationBackendId(id) ((id) >= SessionRelFirstBackendId)
+
 #endif							/* BACKENDID_H */
diff --git a/src/include/storage/buf_internals.h b/src/include/storage/buf_internals.h
index df2dda7..7adb96b 100644
--- a/src/include/storage/buf_internals.h
+++ b/src/include/storage/buf_internals.h
@@ -90,16 +90,17 @@
  */
 typedef struct buftag
 {
-	RelFileNode rnode;			/* physical relation identifier */
+	RelFileNodeBackend rnode;			/* physical relation identifier */
 	ForkNumber	forkNum;
 	BlockNumber blockNum;		/* blknum relative to begin of reln */
 } BufferTag;
 
 #define CLEAR_BUFFERTAG(a) \
 ( \
-	(a).rnode.spcNode = InvalidOid, \
-	(a).rnode.dbNode = InvalidOid, \
-	(a).rnode.relNode = InvalidOid, \
+	(a).rnode.node.spcNode = InvalidOid, \
+	(a).rnode.node.dbNode = InvalidOid, \
+	(a).rnode.node.relNode = InvalidOid, \
+	(a).rnode.backend = InvalidBackendId, \
 	(a).forkNum = InvalidForkNumber, \
 	(a).blockNum = InvalidBlockNumber \
 )
@@ -113,7 +114,7 @@ typedef struct buftag
 
 #define BUFFERTAGS_EQUAL(a,b) \
 ( \
-	RelFileNodeEquals((a).rnode, (b).rnode) && \
+	RelFileNodeBackendEquals((a).rnode, (b).rnode) && \
 	(a).blockNum == (b).blockNum && \
 	(a).forkNum == (b).forkNum \
 )
diff --git a/src/include/storage/bufmgr.h b/src/include/storage/bufmgr.h
index 509f4b7..3315fa0 100644
--- a/src/include/storage/bufmgr.h
+++ b/src/include/storage/bufmgr.h
@@ -205,7 +205,7 @@ extern XLogRecPtr BufferGetLSNAtomic(Buffer buffer);
 extern void PrintPinnedBufs(void);
 #endif
 extern Size BufferShmemSize(void);
-extern void BufferGetTag(Buffer buffer, RelFileNode *rnode,
+extern void BufferGetTag(Buffer buffer, RelFileNodeBackend *rnode,
 						 ForkNumber *forknum, BlockNumber *blknum);
 
 extern void MarkBufferDirtyHint(Buffer buffer, bool buffer_std);
diff --git a/src/include/storage/bufpage.h b/src/include/storage/bufpage.h
index 4ef6d8d..bac7a31 100644
--- a/src/include/storage/bufpage.h
+++ b/src/include/storage/bufpage.h
@@ -229,6 +229,13 @@ typedef PageHeaderData *PageHeader;
 #define PageIsNew(page) (((PageHeader) (page))->pd_upper == 0)
 
 /*
+ * Page of temporary relation is not initialized
+ */
+#define GlobalTempRelationPageIsNotInitialized(rel, page) \
+	((rel)->rd_rel->relpersistence == RELPERSISTENCE_SESSION && PageIsNew(page))
+
+
+/*
  * PageGetItemId
  *		Returns an item identifier of a page.
  */
diff --git a/src/include/storage/relfilenode.h b/src/include/storage/relfilenode.h
index 586500a..20aec72 100644
--- a/src/include/storage/relfilenode.h
+++ b/src/include/storage/relfilenode.h
@@ -75,10 +75,25 @@ typedef struct RelFileNodeBackend
 	BackendId	backend;
 } RelFileNodeBackend;
 
+/*
+ * Check whether it is local or global temporary relation, which data belongs only to one backend.
+ */
 #define RelFileNodeBackendIsTemp(rnode) \
 	((rnode).backend != InvalidBackendId)
 
 /*
+ * Check whether it is global temporary relation which metadata is shared by all sessions,
+ * but data is private for the current session.
+ */
+#define RelFileNodeBackendIsGlobalTemp(rnode) IsSessionRelationBackendId((rnode).backend)
+
+/*
+ * Check whether it is local temporary relation which exists only in this backend.
+ */
+#define RelFileNodeBackendIsLocalTemp(rnode) \
+	(RelFileNodeBackendIsTemp(rnode) && !RelFileNodeBackendIsGlobalTemp(rnode))
+
+/*
  * Note: RelFileNodeEquals and RelFileNodeBackendEquals compare relNode first
  * since that is most likely to be different in two unequal RelFileNodes.  It
  * is probably redundant to compare spcNode if the other fields are found equal,
diff --git a/src/include/utils/rel.h b/src/include/utils/rel.h
index b0fe19e..b361851 100644
--- a/src/include/utils/rel.h
+++ b/src/include/utils/rel.h
@@ -328,6 +328,17 @@ typedef struct StdRdOptions
 	((relation)->rd_options ? \
 	 ((StdRdOptions *) (relation)->rd_options)->parallel_workers : (defaultpw))
 
+/*
+ * Relation persistence is either TEMP either SESSION
+ */
+#define IsLocalRelpersistence(relpersistence) \
+	((relpersistence) == RELPERSISTENCE_TEMP || (relpersistence) == RELPERSISTENCE_SESSION)
+
+/*
+ * Relation is either global either local temp table
+ */
+#define RelationHasSessionScope(relation) \
+	IsLocalRelpersistence(((relation)->rd_rel->relpersistence))
 
 /*
  * ViewOptions
diff --git a/src/test/isolation/expected/inherit-global-temp.out b/src/test/isolation/expected/inherit-global-temp.out
new file mode 100644
index 0000000..6114f8c
--- /dev/null
+++ b/src/test/isolation/expected/inherit-global-temp.out
@@ -0,0 +1,218 @@
+Parsed test spec with 2 sessions
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_update_p s1_update_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_update_p: UPDATE inh_global_parent SET a = 11 WHERE a = 1;
+step s1_update_c: UPDATE inh_global_parent SET a = 13 WHERE a IN (3, 5);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+2              
+11             
+4              
+13             
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+4              
+13             
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+2              
+11             
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_update_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_update_c: UPDATE inh_global_parent SET a = 15 WHERE a IN (3, 5);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+6              
+15             
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+6              
+15             
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_delete_p s1_delete_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_delete_p: DELETE FROM inh_global_parent WHERE a = 2;
+step s1_delete_c: DELETE FROM inh_global_parent WHERE a IN (4, 6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+3              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_delete_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_delete_c: DELETE FROM inh_global_parent WHERE a IN (4, 6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+5              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_truncate_p s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_truncate_p s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_truncate_p: TRUNCATE inh_global_parent;
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_begin s1_truncate_p s2_select_p s1_commit
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_begin: BEGIN;
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s2_select_p: SELECT a FROM inh_global_parent; <waiting ...>
+step s1_commit: COMMIT;
+step s2_select_p: <... completed>
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_begin s1_truncate_p s2_select_c s1_commit
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_begin: BEGIN;
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2; <waiting ...>
+step s1_commit: COMMIT;
+step s2_select_c: <... completed>
+a              
+
+5              
+6              
diff --git a/src/test/isolation/isolation_schedule b/src/test/isolation/isolation_schedule
index 74b5077..44df4e0 100644
--- a/src/test/isolation/isolation_schedule
+++ b/src/test/isolation/isolation_schedule
@@ -85,3 +85,4 @@ test: plpgsql-toast
 test: truncate-conflict
 test: serializable-parallel
 test: serializable-parallel-2
+test: inherit-global-temp
diff --git a/src/test/isolation/specs/inherit-global-temp.spec b/src/test/isolation/specs/inherit-global-temp.spec
new file mode 100644
index 0000000..5e95dd6
--- /dev/null
+++ b/src/test/isolation/specs/inherit-global-temp.spec
@@ -0,0 +1,73 @@
+# This is a copy of the inherit-temp test with little changes for global temporary tables.
+#
+
+setup
+{
+  CREATE TABLE inh_global_parent (a int);
+}
+
+teardown
+{
+  DROP TABLE inh_global_parent;
+}
+
+# Session 1 executes actions which act directly on both the parent and
+# its child.  Abbreviation "c" is used for queries working on the child
+# and "p" on the parent.
+session "s1"
+setup
+{
+  CREATE GLOBAL TEMPORARY TABLE inh_global_temp_child_s1 () INHERITS (inh_global_parent);
+}
+step "s1_begin" { BEGIN; }
+step "s1_truncate_p" { TRUNCATE inh_global_parent; }
+step "s1_select_p" { SELECT a FROM inh_global_parent; }
+step "s1_select_c" { SELECT a FROM inh_global_temp_child_s1; }
+step "s1_insert_p" { INSERT INTO inh_global_parent VALUES (1), (2); }
+step "s1_insert_c" { INSERT INTO inh_global_temp_child_s1 VALUES (3), (4); }
+step "s1_update_p" { UPDATE inh_global_parent SET a = 11 WHERE a = 1; }
+step "s1_update_c" { UPDATE inh_global_parent SET a = 13 WHERE a IN (3, 5); }
+step "s1_delete_p" { DELETE FROM inh_global_parent WHERE a = 2; }
+step "s1_delete_c" { DELETE FROM inh_global_parent WHERE a IN (4, 6); }
+step "s1_commit" { COMMIT; }
+teardown
+{
+  DROP TABLE inh_global_temp_child_s1;
+}
+
+# Session 2 executes actions on the parent which act only on the child.
+session "s2"
+setup
+{
+  CREATE GLOBAL TEMPORARY TABLE inh_global_temp_child_s2 () INHERITS (inh_global_parent);
+}
+step "s2_truncate_p" { TRUNCATE inh_global_parent; }
+step "s2_select_p" { SELECT a FROM inh_global_parent; }
+step "s2_select_c" { SELECT a FROM inh_global_temp_child_s2; }
+step "s2_insert_c" { INSERT INTO inh_global_temp_child_s2 VALUES (5), (6); }
+step "s2_update_c" { UPDATE inh_global_parent SET a = 15 WHERE a IN (3, 5); }
+step "s2_delete_c" { DELETE FROM inh_global_parent WHERE a IN (4, 6); }
+teardown
+{
+  DROP TABLE inh_global_temp_child_s2;
+}
+
+# Check INSERT behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check UPDATE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_update_p" "s1_update_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_update_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check DELETE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_delete_p" "s1_delete_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_delete_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check TRUNCATE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_truncate_p" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_truncate_p" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# TRUNCATE on a parent tree does not block access to temporary child relation
+# of another session, and blocks when scanning the parent.
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_begin" "s1_truncate_p" "s2_select_p" "s1_commit"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_begin" "s1_truncate_p" "s2_select_c" "s1_commit"
diff --git a/src/test/regress/expected/global_temp.out b/src/test/regress/expected/global_temp.out
new file mode 100644
index 0000000..b7bf067
--- /dev/null
+++ b/src/test/regress/expected/global_temp.out
@@ -0,0 +1,323 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+-- Test ON COMMIT DELETE ROWS
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+   2
+(2 rows)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+(1 row)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+ col 
+-----
+   1
+(1 row)
+
+SELECT * FROM global_temptest2;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest2;
+DROP TABLE global_temptest1;
+-- Unsupported ON COMMIT and foreign key combination
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+ERROR:  unsupported ON COMMIT and foreign key combination
+DETAIL:  Table "global_temptest4" references "global_temptest3", but they do not have the same ON COMMIT setting.
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+ a 
+---
+(0 rows)
+
+DROP TABLE temp_parted_oncommit;
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+              relname              
+-----------------------------------
+ global_temp_parted_oncommit_test
+ global_temp_parted_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_parted_oncommit_test;
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+            relname             
+--------------------------------
+ global_temp_inh_oncommit_test
+ global_temp_inh_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ERROR:  cannot inherit from temporary relation "global_temp_table"
+ROLLBACK;
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM global_temp_table;
+ a 
+---
+ 1
+(1 row)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+(2 rows)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       1
+(1 row)
+
+\c
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+(0 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       2
+(1 row)
+
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       3
+(1 row)
+
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
+-- Test two phase commit
+CREATE TABLE global_temptest_persistent(col int);
+CREATE GLOBAL TEMP TABLE global_temptest(col int);
+INSERT INTO global_temptest VALUES (1);
+BEGIN;
+INSERT INTO global_temptest VALUES (2);
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+   2
+(2 rows)
+
+PREPARE TRANSACTION 'global_temp1';
+-- We can't see anything from an uncommitted transaction
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+(1 row)
+
+BEGIN;
+INSERT INTO global_temptest VALUES (3);
+INSERT INTO global_temptest_persistent SELECT * FROM global_temptest;
+PREPARE TRANSACTION 'global_temp2';
+COMMIT PREPARED 'global_temp1';
+-- 1, 2
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+   2
+(2 rows)
+
+-- Nothing
+SELECT * FROM global_temptest_persistent;
+ col 
+-----
+(0 rows)
+
+\c
+-- The temp table is empty now.
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+-- Still nothing in global_temptest_persistent table;
+SELECT * FROM global_temptest_persistent;
+ col 
+-----
+(0 rows)
+
+INSERT INTO global_temptest VALUES (4);
+COMMIT PREPARED 'global_temp2';
+-- Only 4
+SELECT * FROM global_temptest;
+ col 
+-----
+   4
+(1 row)
+
+-- 1, 3
+SELECT * FROM global_temptest_persistent;
+ col 
+-----
+   1
+   3
+(2 rows)
+
+\c
+DROP TABLE global_temptest;
+DROP TABLE global_temptest_persistent;
diff --git a/src/test/regress/expected/global_temp_0.out b/src/test/regress/expected/global_temp_0.out
new file mode 100644
index 0000000..934e751
--- /dev/null
+++ b/src/test/regress/expected/global_temp_0.out
@@ -0,0 +1,326 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+-- Test ON COMMIT DELETE ROWS
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+   2
+(2 rows)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+(1 row)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+ col 
+-----
+   1
+(1 row)
+
+SELECT * FROM global_temptest2;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest2;
+DROP TABLE global_temptest1;
+-- Unsupported ON COMMIT and foreign key combination
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+ERROR:  unsupported ON COMMIT and foreign key combination
+DETAIL:  Table "global_temptest4" references "global_temptest3", but they do not have the same ON COMMIT setting.
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+ a 
+---
+(0 rows)
+
+DROP TABLE temp_parted_oncommit;
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+              relname              
+-----------------------------------
+ global_temp_parted_oncommit_test
+ global_temp_parted_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_parted_oncommit_test;
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+            relname             
+--------------------------------
+ global_temp_inh_oncommit_test
+ global_temp_inh_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ERROR:  cannot inherit from temporary relation "global_temp_table"
+ROLLBACK;
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM global_temp_table;
+ a 
+---
+ 1
+(1 row)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+(2 rows)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       1
+(1 row)
+
+\c
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+(0 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       2
+(1 row)
+
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       3
+(1 row)
+
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
+-- Test two phase commit
+CREATE TABLE global_temptest_persistent(col int);
+CREATE GLOBAL TEMP TABLE global_temptest(col int);
+INSERT INTO global_temptest VALUES (1);
+BEGIN;
+INSERT INTO global_temptest VALUES (2);
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+   2
+(2 rows)
+
+PREPARE TRANSACTION 'global_temp1';
+ERROR:  prepared transactions are disabled
+HINT:  Set max_prepared_transactions to a nonzero value.
+-- We can't see anything from an uncommitted transaction
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+(1 row)
+
+BEGIN;
+INSERT INTO global_temptest VALUES (3);
+INSERT INTO global_temptest_persistent SELECT * FROM global_temptest;
+PREPARE TRANSACTION 'global_temp2';
+ERROR:  prepared transactions are disabled
+HINT:  Set max_prepared_transactions to a nonzero value.
+COMMIT PREPARED 'global_temp1';
+ERROR:  prepared transaction with identifier "global_temp1" does not exist
+-- 1, 2
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+(1 row)
+
+-- Nothing
+SELECT * FROM global_temptest_persistent;
+ col 
+-----
+(0 rows)
+
+\c
+-- The temp table is empty now.
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+-- Still nothing in global_temptest_persistent table;
+SELECT * FROM global_temptest_persistent;
+ col 
+-----
+(0 rows)
+
+INSERT INTO global_temptest VALUES (4);
+COMMIT PREPARED 'global_temp2';
+ERROR:  prepared transaction with identifier "global_temp2" does not exist
+-- Only 4
+SELECT * FROM global_temptest;
+ col 
+-----
+   4
+(1 row)
+
+-- 1, 3
+SELECT * FROM global_temptest_persistent;
+ col 
+-----
+(0 rows)
+
+\c
+DROP TABLE global_temptest;
+DROP TABLE global_temptest_persistent;
diff --git a/src/test/regress/expected/session_table.out b/src/test/regress/expected/session_table.out
new file mode 100644
index 0000000..1b9b3f4
--- /dev/null
+++ b/src/test/regress/expected/session_table.out
@@ -0,0 +1,64 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+ count 
+-------
+ 10000
+(1 row)
+
+\c
+select count(*) from my_private_table;
+ count 
+-------
+     0
+(1 row)
+
+select * from my_private_table where x=10001;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select * from my_private_table where y=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select count(*) from my_private_table;
+ count  
+--------
+ 100000
+(1 row)
+
+\c
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+   x    |   y    
+--------+--------
+ 100000 | 100000
+(1 row)
+
+drop table  my_private_table;
diff --git a/src/test/regress/parallel_schedule b/src/test/regress/parallel_schedule
index fc0f141..507cf7d 100644
--- a/src/test/regress/parallel_schedule
+++ b/src/test/regress/parallel_schedule
@@ -107,7 +107,7 @@ test: json jsonb json_encoding jsonpath jsonpath_encoding jsonb_jsonpath
 # NB: temp.sql does a reconnect which transiently uses 2 connections,
 # so keep this parallel group to at most 19 tests
 # ----------
-test: plancache limit plpgsql copy2 temp domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
+test: plancache limit plpgsql copy2 temp global_temp session_table domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
 
 # ----------
 # Another group of parallel tests
diff --git a/src/test/regress/serial_schedule b/src/test/regress/serial_schedule
index 68ac56a..3890777 100644
--- a/src/test/regress/serial_schedule
+++ b/src/test/regress/serial_schedule
@@ -172,6 +172,8 @@ test: limit
 test: plpgsql
 test: copy2
 test: temp
+test: global_temp
+test: session_table
 test: domain
 test: rangefuncs
 test: prepare
diff --git a/src/test/regress/sql/global_temp.sql b/src/test/regress/sql/global_temp.sql
new file mode 100644
index 0000000..4d2da8d
--- /dev/null
+++ b/src/test/regress/sql/global_temp.sql
@@ -0,0 +1,191 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+
+-- Test ON COMMIT DELETE ROWS
+
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+SELECT * FROM global_temptest2;
+
+DROP TABLE global_temptest2;
+DROP TABLE global_temptest1;
+
+-- Unsupported ON COMMIT and foreign key combination
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+DROP TABLE temp_parted_oncommit;
+
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+DROP TABLE global_temp_parted_oncommit_test;
+
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ROLLBACK;
+
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+COMMIT;
+SELECT * FROM global_temp_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+COMMIT;
+SELECT * FROM normal_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+\c
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
+
+-- Test two phase commit
+CREATE TABLE global_temptest_persistent(col int);
+CREATE GLOBAL TEMP TABLE global_temptest(col int);
+INSERT INTO global_temptest VALUES (1);
+
+BEGIN;
+INSERT INTO global_temptest VALUES (2);
+SELECT * FROM global_temptest;
+PREPARE TRANSACTION 'global_temp1';
+-- We can't see anything from an uncommitted transaction
+SELECT * FROM global_temptest;
+
+BEGIN;
+INSERT INTO global_temptest VALUES (3);
+INSERT INTO global_temptest_persistent SELECT * FROM global_temptest;
+PREPARE TRANSACTION 'global_temp2';
+COMMIT PREPARED 'global_temp1';
+-- 1, 2
+SELECT * FROM global_temptest;
+-- Nothing
+SELECT * FROM global_temptest_persistent;
+\c
+-- The temp table is empty now.
+SELECT * FROM global_temptest;
+-- Still nothing in global_temptest_persistent table;
+SELECT * FROM global_temptest_persistent;
+INSERT INTO global_temptest VALUES (4);
+COMMIT PREPARED 'global_temp2';
+-- Only 4
+SELECT * FROM global_temptest;
+-- 1, 3
+SELECT * FROM global_temptest_persistent;
+\c
+DROP TABLE global_temptest;
+DROP TABLE global_temptest_persistent;
diff --git a/src/test/regress/sql/session_table.sql b/src/test/regress/sql/session_table.sql
new file mode 100644
index 0000000..c6663dc
--- /dev/null
+++ b/src/test/regress/sql/session_table.sql
@@ -0,0 +1,18 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+\c
+select count(*) from my_private_table;
+select * from my_private_table where x=10001;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+select * from my_private_table where y=10001;
+select count(*) from my_private_table;
+\c
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+drop table  my_private_table;

diff --git a/contrib/pg_buffercache/pg_buffercache_pages.c b/contrib/pg_buffercache/pg_buffercache_pages.c
index 1bd579f..2d93f6f 100644
--- a/contrib/pg_buffercache/pg_buffercache_pages.c
+++ b/contrib/pg_buffercache/pg_buffercache_pages.c
@@ -153,9 +153,9 @@ pg_buffercache_pages(PG_FUNCTION_ARGS)
 			buf_state = LockBufHdr(bufHdr);
 
 			fctx->record[i].bufferid = BufferDescriptorGetBuffer(bufHdr);
-			fctx->record[i].relfilenode = bufHdr->tag.rnode.relNode;
-			fctx->record[i].reltablespace = bufHdr->tag.rnode.spcNode;
-			fctx->record[i].reldatabase = bufHdr->tag.rnode.dbNode;
+			fctx->record[i].relfilenode = bufHdr->tag.rnode.node.relNode;
+			fctx->record[i].reltablespace = bufHdr->tag.rnode.node.spcNode;
+			fctx->record[i].reldatabase = bufHdr->tag.rnode.node.dbNode;
 			fctx->record[i].forknum = bufHdr->tag.forkNum;
 			fctx->record[i].blocknum = bufHdr->tag.blockNum;
 			fctx->record[i].usagecount = BUF_STATE_GET_USAGECOUNT(buf_state);
diff --git a/contrib/pg_prewarm/autoprewarm.c b/contrib/pg_prewarm/autoprewarm.c
index 38ae240..8a04954 100644
--- a/contrib/pg_prewarm/autoprewarm.c
+++ b/contrib/pg_prewarm/autoprewarm.c
@@ -608,9 +608,9 @@ apw_dump_now(bool is_bgworker, bool dump_unlogged)
 		if (buf_state & BM_TAG_VALID &&
 			((buf_state & BM_PERMANENT) || dump_unlogged))
 		{
-			block_info_array[num_blocks].database = bufHdr->tag.rnode.dbNode;
-			block_info_array[num_blocks].tablespace = bufHdr->tag.rnode.spcNode;
-			block_info_array[num_blocks].filenode = bufHdr->tag.rnode.relNode;
+			block_info_array[num_blocks].database = bufHdr->tag.rnode.node.dbNode;
+			block_info_array[num_blocks].tablespace = bufHdr->tag.rnode.node.spcNode;
+			block_info_array[num_blocks].filenode = bufHdr->tag.rnode.node.relNode;
 			block_info_array[num_blocks].forknum = bufHdr->tag.forkNum;
 			block_info_array[num_blocks].blocknum = bufHdr->tag.blockNum;
 			++num_blocks;
diff --git a/contrib/pgrowlocks/pgrowlocks.c b/contrib/pgrowlocks/pgrowlocks.c
index a2c44a9..43b4c66 100644
--- a/contrib/pgrowlocks/pgrowlocks.c
+++ b/contrib/pgrowlocks/pgrowlocks.c
@@ -158,7 +158,8 @@ pgrowlocks(PG_FUNCTION_ARGS)
 		/* must hold a buffer lock to call HeapTupleSatisfiesUpdate */
 		LockBuffer(hscan->rs_cbuf, BUFFER_LOCK_SHARE);
 
-		htsu = HeapTupleSatisfiesUpdate(tuple,
+		htsu = HeapTupleSatisfiesUpdate(mydata->rel,
+										tuple,
 										GetCurrentCommandId(false),
 										hscan->rs_cbuf);
 		xmax = HeapTupleHeaderGetRawXmax(tuple->t_data);
diff --git a/contrib/pgstattuple/pgstattuple.c b/contrib/pgstattuple/pgstattuple.c
index 70af43e..9cce720 100644
--- a/contrib/pgstattuple/pgstattuple.c
+++ b/contrib/pgstattuple/pgstattuple.c
@@ -349,7 +349,7 @@ pgstat_heap(Relation rel, FunctionCallInfo fcinfo)
 		/* must hold a buffer lock to call HeapTupleSatisfiesVisibility */
 		LockBuffer(hscan->rs_cbuf, BUFFER_LOCK_SHARE);
 
-		if (HeapTupleSatisfiesVisibility(tuple, &SnapshotDirty, hscan->rs_cbuf))
+		if (HeapTupleSatisfiesVisibility(rel, tuple, &SnapshotDirty, hscan->rs_cbuf))
 		{
 			stat.tuple_len += tuple->t_len;
 			stat.tuple_count++;
diff --git a/src/backend/access/brin/brin_revmap.c b/src/backend/access/brin/brin_revmap.c
index 647350c..ca5f22d 100644
--- a/src/backend/access/brin/brin_revmap.c
+++ b/src/backend/access/brin/brin_revmap.c
@@ -25,6 +25,7 @@
 #include "access/brin_revmap.h"
 #include "access/brin_tuple.h"
 #include "access/brin_xlog.h"
+#include "access/brin.h"
 #include "access/rmgr.h"
 #include "access/xloginsert.h"
 #include "miscadmin.h"
@@ -79,6 +80,11 @@ brinRevmapInitialize(Relation idxrel, BlockNumber *pagesPerRange,
 	meta = ReadBuffer(idxrel, BRIN_METAPAGE_BLKNO);
 	LockBuffer(meta, BUFFER_LOCK_SHARE);
 	page = BufferGetPage(meta);
+
+	if (GlobalTempRelationPageIsNotInitialized(idxrel, page))
+		brin_metapage_init(page, BrinGetPagesPerRange(idxrel),
+						   BRIN_CURRENT_VERSION);
+
 	TestForOldSnapshot(snapshot, idxrel, page);
 	metadata = (BrinMetaPageData *) PageGetContents(page);
 
diff --git a/src/backend/access/gin/ginfast.c b/src/backend/access/gin/ginfast.c
index 439a91b..8a6ac71 100644
--- a/src/backend/access/gin/ginfast.c
+++ b/src/backend/access/gin/ginfast.c
@@ -241,6 +241,16 @@ ginHeapTupleFastInsert(GinState *ginstate, GinTupleCollector *collector)
 	metabuffer = ReadBuffer(index, GIN_METAPAGE_BLKNO);
 	metapage = BufferGetPage(metabuffer);
 
+	if (GlobalTempRelationPageIsNotInitialized(index, metapage))
+	{
+		Buffer rootbuffer = ReadBuffer(index, GIN_ROOT_BLKNO);
+		LockBuffer(rootbuffer, BUFFER_LOCK_EXCLUSIVE);
+		GinInitMetabuffer(metabuffer);
+		GinInitBuffer(rootbuffer, GIN_LEAF);
+		MarkBufferDirty(rootbuffer);
+		UnlockReleaseBuffer(rootbuffer);
+	}
+
 	/*
 	 * An insertion to the pending list could logically belong anywhere in the
 	 * tree, so it conflicts with all serializable scans.  All scans acquire a
diff --git a/src/backend/access/gin/ginget.c b/src/backend/access/gin/ginget.c
index b18ae2b..41bab5d 100644
--- a/src/backend/access/gin/ginget.c
+++ b/src/backend/access/gin/ginget.c
@@ -1750,7 +1750,7 @@ collectMatchesForHeapRow(IndexScanDesc scan, pendingPosition *pos)
 /*
  * Collect all matched rows from pending list into bitmap.
  */
-static void
+static bool
 scanPendingInsert(IndexScanDesc scan, TIDBitmap *tbm, int64 *ntids)
 {
 	GinScanOpaque so = (GinScanOpaque) scan->opaque;
@@ -1774,6 +1774,12 @@ scanPendingInsert(IndexScanDesc scan, TIDBitmap *tbm, int64 *ntids)
 	LockBuffer(metabuffer, GIN_SHARE);
 	page = BufferGetPage(metabuffer);
 	TestForOldSnapshot(scan->xs_snapshot, scan->indexRelation, page);
+
+	if (GlobalTempRelationPageIsNotInitialized(scan->indexRelation, page))
+	{
+		UnlockReleaseBuffer(metabuffer);
+		return false;
+	}
 	blkno = GinPageGetMeta(page)->head;
 
 	/*
@@ -1784,7 +1790,7 @@ scanPendingInsert(IndexScanDesc scan, TIDBitmap *tbm, int64 *ntids)
 	{
 		/* No pending list, so proceed with normal scan */
 		UnlockReleaseBuffer(metabuffer);
-		return;
+		return true;
 	}
 
 	pos.pendingBuffer = ReadBuffer(scan->indexRelation, blkno);
@@ -1840,6 +1846,7 @@ scanPendingInsert(IndexScanDesc scan, TIDBitmap *tbm, int64 *ntids)
 	}
 
 	pfree(pos.hasMatchKey);
+	return true;
 }
 
 
@@ -1875,7 +1882,8 @@ gingetbitmap(IndexScanDesc scan, TIDBitmap *tbm)
 	 * to scan the main index before the pending list, since concurrent
 	 * cleanup could then make us miss entries entirely.
 	 */
-	scanPendingInsert(scan, tbm, &ntids);
+	if (!scanPendingInsert(scan, tbm, &ntids))
+		return 0;
 
 	/*
 	 * Now scan the main index.
diff --git a/src/backend/access/gin/ginxlog.c b/src/backend/access/gin/ginxlog.c
index c945b28..14d4e48 100644
--- a/src/backend/access/gin/ginxlog.c
+++ b/src/backend/access/gin/ginxlog.c
@@ -95,13 +95,13 @@ ginRedoInsertEntry(Buffer buffer, bool isLeaf, BlockNumber rightblkno, void *rda
 
 	if (PageAddItem(page, (Item) itup, IndexTupleSize(itup), offset, false, false) == InvalidOffsetNumber)
 	{
-		RelFileNode node;
+		RelFileNodeBackend rnode;
 		ForkNumber	forknum;
 		BlockNumber blknum;
 
-		BufferGetTag(buffer, &node, &forknum, &blknum);
+		BufferGetTag(buffer, &rnode, &forknum, &blknum);
 		elog(ERROR, "failed to add item to index page in %u/%u/%u",
-			 node.spcNode, node.dbNode, node.relNode);
+			 rnode.node.spcNode, rnode.node.dbNode, rnode.node.relNode);
 	}
 }
 
diff --git a/src/backend/access/gist/gist.c b/src/backend/access/gist/gist.c
index 0cc8791..3215b6f 100644
--- a/src/backend/access/gist/gist.c
+++ b/src/backend/access/gist/gist.c
@@ -677,7 +677,10 @@ gistdoinsert(Relation r, IndexTuple itup, Size freespace,
 		if (!xlocked)
 		{
 			LockBuffer(stack->buffer, GIST_SHARE);
-			gistcheckpage(state.r, stack->buffer);
+			if (stack->blkno == GIST_ROOT_BLKNO && GlobalTempRelationPageIsNotInitialized(state.r, BufferGetPage(stack->buffer)))
+				GISTInitBuffer(stack->buffer, F_LEAF);
+			else
+				gistcheckpage(state.r, stack->buffer);
 		}
 
 		stack->page = (Page) BufferGetPage(stack->buffer);
diff --git a/src/backend/access/gist/gistget.c b/src/backend/access/gist/gistget.c
index 22d790d..4c52dbe 100644
--- a/src/backend/access/gist/gistget.c
+++ b/src/backend/access/gist/gistget.c
@@ -344,7 +344,10 @@ gistScanPage(IndexScanDesc scan, GISTSearchItem *pageItem,
 	buffer = ReadBuffer(scan->indexRelation, pageItem->blkno);
 	LockBuffer(buffer, GIST_SHARE);
 	PredicateLockPage(r, BufferGetBlockNumber(buffer), scan->xs_snapshot);
-	gistcheckpage(scan->indexRelation, buffer);
+	if (pageItem->blkno == GIST_ROOT_BLKNO && GlobalTempRelationPageIsNotInitialized(r, BufferGetPage(buffer)))
+		GISTInitBuffer(buffer, F_LEAF);
+	else
+		gistcheckpage(scan->indexRelation, buffer);
 	page = BufferGetPage(buffer);
 	TestForOldSnapshot(scan->xs_snapshot, r, page);
 	opaque = GistPageGetOpaque(page);
diff --git a/src/backend/access/gist/gistutil.c b/src/backend/access/gist/gistutil.c
index 45804d7..50b306a 100644
--- a/src/backend/access/gist/gistutil.c
+++ b/src/backend/access/gist/gistutil.c
@@ -1028,7 +1028,7 @@ gistGetFakeLSN(Relation rel)
 {
 	static XLogRecPtr counter = FirstNormalUnloggedLSN;
 
-	if (rel->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
+	if (RelationHasSessionScope(rel))
 	{
 		/*
 		 * Temporary relations are only accessible in our session, so a simple
diff --git a/src/backend/access/hash/hashpage.c b/src/backend/access/hash/hashpage.c
index 838ee68..4f794b3 100644
--- a/src/backend/access/hash/hashpage.c
+++ b/src/backend/access/hash/hashpage.c
@@ -75,13 +75,20 @@ _hash_getbuf(Relation rel, BlockNumber blkno, int access, int flags)
 
 	buf = ReadBuffer(rel, blkno);
 
-	if (access != HASH_NOLOCK)
-		LockBuffer(buf, access);
-
 	/* ref count and lock type are correct */
 
-	_hash_checkpage(rel, buf, flags);
-
+	if (blkno == HASH_METAPAGE && GlobalTempRelationPageIsNotInitialized(rel, BufferGetPage(buf)))
+	{
+		_hash_init(rel, 0, MAIN_FORKNUM);
+		if (access != HASH_NOLOCK)
+			LockBuffer(buf, access);
+	}
+	else
+	{
+		if (access != HASH_NOLOCK)
+			LockBuffer(buf, access);
+		_hash_checkpage(rel, buf, flags);
+	}
 	return buf;
 }
 
@@ -339,7 +346,7 @@ _hash_init(Relation rel, double num_tuples, ForkNumber forkNum)
 	bool		use_wal;
 
 	/* safety check */
-	if (RelationGetNumberOfBlocksInFork(rel, forkNum) != 0)
+	if (rel->rd_rel->relpersistence != RELPERSISTENCE_SESSION && RelationGetNumberOfBlocksInFork(rel, forkNum) != 0)
 		elog(ERROR, "cannot initialize non-empty hash index \"%s\"",
 			 RelationGetRelationName(rel));
 
diff --git a/src/backend/access/heap/heapam.c b/src/backend/access/heap/heapam.c
index e954482..2f5f5ef 100644
--- a/src/backend/access/heap/heapam.c
+++ b/src/backend/access/heap/heapam.c
@@ -444,7 +444,7 @@ heapgetpage(TableScanDesc sscan, BlockNumber page)
 			if (all_visible)
 				valid = true;
 			else
-				valid = HeapTupleSatisfiesVisibility(&loctup, snapshot, buffer);
+				valid = HeapTupleSatisfiesVisibility(scan->rs_base.rs_rd, &loctup, snapshot, buffer);
 
 			CheckForSerializableConflictOut(valid, scan->rs_base.rs_rd,
 											&loctup, buffer, snapshot);
@@ -664,7 +664,8 @@ heapgettup(HeapScanDesc scan,
 				/*
 				 * if current tuple qualifies, return it.
 				 */
-				valid = HeapTupleSatisfiesVisibility(tuple,
+				valid = HeapTupleSatisfiesVisibility(scan->rs_base.rs_rd,
+													 tuple,
 													 snapshot,
 													 scan->rs_cbuf);
 
@@ -1474,7 +1475,7 @@ heap_fetch(Relation relation,
 	/*
 	 * check tuple visibility, then release lock
 	 */
-	valid = HeapTupleSatisfiesVisibility(tuple, snapshot, buffer);
+	valid = HeapTupleSatisfiesVisibility(relation, tuple, snapshot, buffer);
 
 	if (valid)
 		PredicateLockTuple(relation, tuple, snapshot);
@@ -1609,7 +1610,7 @@ heap_hot_search_buffer(ItemPointer tid, Relation relation, Buffer buffer,
 		if (!skip)
 		{
 			/* If it's visible per the snapshot, we must return it */
-			valid = HeapTupleSatisfiesVisibility(heapTuple, snapshot, buffer);
+			valid = HeapTupleSatisfiesVisibility(relation, heapTuple, snapshot, buffer);
 			CheckForSerializableConflictOut(valid, relation, heapTuple,
 											buffer, snapshot);
 
@@ -1749,7 +1750,7 @@ heap_get_latest_tid(TableScanDesc sscan,
 		 * Check tuple visibility; if visible, set it as the new result
 		 * candidate.
 		 */
-		valid = HeapTupleSatisfiesVisibility(&tp, snapshot, buffer);
+		valid = HeapTupleSatisfiesVisibility(relation, &tp, snapshot, buffer);
 		CheckForSerializableConflictOut(valid, relation, &tp, buffer, snapshot);
 		if (valid)
 			*tid = ctid;
@@ -1846,6 +1847,14 @@ ReleaseBulkInsertStatePin(BulkInsertState bistate)
 }
 
 
+static TransactionId
+GetTransactionId(Relation relation)
+{
+	return relation->rd_rel->relpersistence == RELPERSISTENCE_SESSION && RecoveryInProgress()
+		? GetReplicaTransactionId()
+		: GetCurrentTransactionId();
+}
+
 /*
  *	heap_insert		- insert tuple into a heap
  *
@@ -1868,7 +1877,7 @@ void
 heap_insert(Relation relation, HeapTuple tup, CommandId cid,
 			int options, BulkInsertState bistate)
 {
-	TransactionId xid = GetCurrentTransactionId();
+	TransactionId xid = GetTransactionId(relation);
 	HeapTuple	heaptup;
 	Buffer		buffer;
 	Buffer		vmbuffer = InvalidBuffer;
@@ -2105,7 +2114,7 @@ void
 heap_multi_insert(Relation relation, TupleTableSlot **slots, int ntuples,
 				  CommandId cid, int options, BulkInsertState bistate)
 {
-	TransactionId xid = GetCurrentTransactionId();
+	TransactionId xid = GetTransactionId(relation);
 	HeapTuple  *heaptuples;
 	int			i;
 	int			ndone;
@@ -2444,7 +2453,7 @@ heap_delete(Relation relation, ItemPointer tid,
 			TM_FailureData *tmfd, bool changingPart)
 {
 	TM_Result	result;
-	TransactionId xid = GetCurrentTransactionId();
+	TransactionId xid = GetTransactionId(relation);
 	ItemId		lp;
 	HeapTupleData tp;
 	Page		page;
@@ -2509,7 +2518,7 @@ heap_delete(Relation relation, ItemPointer tid,
 	tp.t_self = *tid;
 
 l1:
-	result = HeapTupleSatisfiesUpdate(&tp, cid, buffer);
+	result = HeapTupleSatisfiesUpdate(relation, &tp, cid, buffer);
 
 	if (result == TM_Invisible)
 	{
@@ -2628,7 +2637,7 @@ l1:
 	if (crosscheck != InvalidSnapshot && result == TM_Ok)
 	{
 		/* Perform additional check for transaction-snapshot mode RI updates */
-		if (!HeapTupleSatisfiesVisibility(&tp, crosscheck, buffer))
+		if (!HeapTupleSatisfiesVisibility(relation, &tp, crosscheck, buffer))
 			result = TM_Updated;
 	}
 
@@ -2895,7 +2904,7 @@ heap_update(Relation relation, ItemPointer otid, HeapTuple newtup,
 			TM_FailureData *tmfd, LockTupleMode *lockmode)
 {
 	TM_Result	result;
-	TransactionId xid = GetCurrentTransactionId();
+	TransactionId xid = GetTransactionId(relation);
 	Bitmapset  *hot_attrs;
 	Bitmapset  *key_attrs;
 	Bitmapset  *id_attrs;
@@ -3065,7 +3074,7 @@ heap_update(Relation relation, ItemPointer otid, HeapTuple newtup,
 l2:
 	checked_lockers = false;
 	locker_remains = false;
-	result = HeapTupleSatisfiesUpdate(&oldtup, cid, buffer);
+	result = HeapTupleSatisfiesUpdate(relation, &oldtup, cid, buffer);
 
 	/* see below about the "no wait" case */
 	Assert(result != TM_BeingModified || wait);
@@ -3258,7 +3267,7 @@ l2:
 	if (crosscheck != InvalidSnapshot && result == TM_Ok)
 	{
 		/* Perform additional check for transaction-snapshot mode RI updates */
-		if (!HeapTupleSatisfiesVisibility(&oldtup, crosscheck, buffer))
+		if (!HeapTupleSatisfiesVisibility(relation, &oldtup, crosscheck, buffer))
 		{
 			result = TM_Updated;
 			Assert(!ItemPointerEquals(&oldtup.t_self, &oldtup.t_data->t_ctid));
@@ -4014,7 +4023,7 @@ heap_lock_tuple(Relation relation, HeapTuple tuple,
 	tuple->t_tableOid = RelationGetRelid(relation);
 
 l3:
-	result = HeapTupleSatisfiesUpdate(tuple, cid, *buffer);
+	result = HeapTupleSatisfiesUpdate(relation, tuple, cid, *buffer);
 
 	if (result == TM_Invisible)
 	{
@@ -4189,7 +4198,7 @@ l3:
 					TM_Result	res;
 
 					res = heap_lock_updated_tuple(relation, tuple, &t_ctid,
-												  GetCurrentTransactionId(),
+												  GetTransactionId(relation),
 												  mode);
 					if (res != TM_Ok)
 					{
@@ -4437,7 +4446,7 @@ l3:
 				TM_Result	res;
 
 				res = heap_lock_updated_tuple(relation, tuple, &t_ctid,
-											  GetCurrentTransactionId(),
+											  GetTransactionId(relation),
 											  mode);
 				if (res != TM_Ok)
 				{
@@ -4546,7 +4555,7 @@ failed:
 	 * state if multixact.c elogs.
 	 */
 	compute_new_xmax_infomask(xmax, old_infomask, tuple->t_data->t_infomask2,
-							  GetCurrentTransactionId(), mode, false,
+							  GetTransactionId(relation), mode, false,
 							  &xid, &new_infomask, &new_infomask2);
 
 	START_CRIT_SECTION();
@@ -5566,7 +5575,7 @@ heap_finish_speculative(Relation relation, ItemPointer tid)
 void
 heap_abort_speculative(Relation relation, ItemPointer tid)
 {
-	TransactionId xid = GetCurrentTransactionId();
+	TransactionId xid = GetTransactionId(relation);
 	ItemId		lp;
 	HeapTupleData tp;
 	Page		page;
diff --git a/src/backend/access/heap/heapam_handler.c b/src/backend/access/heap/heapam_handler.c
index 2dd8821..67a553a 100644
--- a/src/backend/access/heap/heapam_handler.c
+++ b/src/backend/access/heap/heapam_handler.c
@@ -226,7 +226,8 @@ heapam_tuple_satisfies_snapshot(Relation rel, TupleTableSlot *slot,
 	 * Caller should be holding pin, but not lock.
 	 */
 	LockBuffer(bslot->buffer, BUFFER_LOCK_SHARE);
-	res = HeapTupleSatisfiesVisibility(bslot->base.tuple, snapshot,
+
+	res = HeapTupleSatisfiesVisibility(rel, bslot->base.tuple, snapshot,
 									   bslot->buffer);
 	LockBuffer(bslot->buffer, BUFFER_LOCK_UNLOCK);
 
@@ -673,6 +674,7 @@ heapam_relation_copy_data(Relation rel, const RelFileNode *newrnode)
 			 * init fork of an unlogged relation.
 			 */
 			if (rel->rd_rel->relpersistence == RELPERSISTENCE_PERMANENT ||
+				rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ||
 				(rel->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED &&
 				 forkNum == INIT_FORKNUM))
 				log_smgrcreate(newrnode, forkNum);
@@ -2162,7 +2164,7 @@ heapam_scan_bitmap_next_block(TableScanDesc scan,
 			loctup.t_len = ItemIdGetLength(lp);
 			loctup.t_tableOid = scan->rs_rd->rd_id;
 			ItemPointerSet(&loctup.t_self, page, offnum);
-			valid = HeapTupleSatisfiesVisibility(&loctup, snapshot, buffer);
+			valid = HeapTupleSatisfiesVisibility(scan->rs_rd, &loctup, snapshot, buffer);
 			if (valid)
 			{
 				hscan->rs_vistuples[ntup++] = offnum;
@@ -2482,7 +2484,7 @@ SampleHeapTupleVisible(TableScanDesc scan, Buffer buffer,
 	else
 	{
 		/* Otherwise, we have to check the tuple individually. */
-		return HeapTupleSatisfiesVisibility(tuple, scan->rs_snapshot,
+		return HeapTupleSatisfiesVisibility(scan->rs_rd, tuple, scan->rs_snapshot,
 											buffer);
 	}
 }
diff --git a/src/backend/access/heap/heapam_visibility.c b/src/backend/access/heap/heapam_visibility.c
index 537e681..3076f6a 100644
--- a/src/backend/access/heap/heapam_visibility.c
+++ b/src/backend/access/heap/heapam_visibility.c
@@ -77,6 +77,7 @@
 #include "utils/combocid.h"
 #include "utils/snapmgr.h"
 
+static bool TempTupleSatisfiesVisibility(HeapTuple htup, CommandId curcid, Buffer buffer);
 
 /*
  * SetHintBits()
@@ -454,7 +455,7 @@ HeapTupleSatisfiesToast(HeapTuple htup, Snapshot snapshot,
  *	test for it themselves.)
  */
 TM_Result
-HeapTupleSatisfiesUpdate(HeapTuple htup, CommandId curcid,
+HeapTupleSatisfiesUpdate(Relation relation, HeapTuple htup, CommandId curcid,
 						 Buffer buffer)
 {
 	HeapTupleHeader tuple = htup->t_data;
@@ -462,6 +463,13 @@ HeapTupleSatisfiesUpdate(HeapTuple htup, CommandId curcid,
 	Assert(ItemPointerIsValid(&htup->t_self));
 	Assert(htup->t_tableOid != InvalidOid);
 
+	if (relation->rd_rel->relpersistence == RELPERSISTENCE_SESSION && RecoveryInProgress())
+	{
+		AccessTempRelationAtReplica = true;
+		return TempTupleSatisfiesVisibility(htup, curcid, buffer) ? TM_Ok : TM_Invisible;
+	}
+	AccessTempRelationAtReplica = false;
+
 	if (!HeapTupleHeaderXminCommitted(tuple))
 	{
 		if (HeapTupleHeaderXminInvalid(tuple))
@@ -1677,6 +1685,59 @@ HeapTupleSatisfiesHistoricMVCC(HeapTuple htup, Snapshot snapshot,
 }
 
 /*
+ * TempTupleSatisfiesVisibility
+ *		True iff global temp table tuple is visible for the current transaction.
+ *
+ * Temporary tables are visible only for current backend, so there is no need to
+ * handle cases with tuples committed by other backends. We only need to exclude
+ * modifications done by aborted transactions or after start of table scan.
+ *
+ */
+static bool
+TempTupleSatisfiesVisibility(HeapTuple htup, CommandId curcid, Buffer buffer)
+{
+	HeapTupleHeader tuple = htup->t_data;
+	TransactionId xmin;
+	TransactionId xmax;
+
+	Assert(ItemPointerIsValid(&htup->t_self));
+	Assert(htup->t_tableOid != InvalidOid);
+
+	if (HeapTupleHeaderXminInvalid(tuple))
+		return false;
+
+	xmin = HeapTupleHeaderGetRawXmin(tuple);
+
+	if (IsReplicaTransactionAborted(xmin))
+		return false;
+
+	if (IsReplicaCurrentTransactionId(xmin)
+		&& HeapTupleHeaderGetCmin(tuple) >= curcid)
+	{
+		return false;	/* inserted after scan started */
+	}
+
+	if (tuple->t_infomask & HEAP_XMAX_INVALID)	/* xid invalid */
+		return true;
+
+	if (HEAP_XMAX_IS_LOCKED_ONLY(tuple->t_infomask))	/* not deleter */
+		return true;
+
+	xmax = (tuple->t_infomask & HEAP_XMAX_IS_MULTI)
+	    ? HeapTupleGetUpdateXid(tuple)
+		: HeapTupleHeaderGetRawXmax(tuple);
+
+	if (IsReplicaTransactionAborted(xmax))
+		return true; /* updating subtransaction aborted */
+
+	if (!IsReplicaCurrentTransactionId(xmax))
+		return false; /* updating transaction committed */
+
+	return (HeapTupleHeaderGetCmax(tuple) >= curcid);	/* updated after scan started */
+}
+
+
+/*
  * HeapTupleSatisfiesVisibility
  *		True iff heap tuple satisfies a time qual.
  *
@@ -1687,8 +1748,15 @@ HeapTupleSatisfiesHistoricMVCC(HeapTuple htup, Snapshot snapshot,
  *	if so, the indicated buffer is marked dirty.
  */
 bool
-HeapTupleSatisfiesVisibility(HeapTuple tup, Snapshot snapshot, Buffer buffer)
+HeapTupleSatisfiesVisibility(Relation relation, HeapTuple tup, Snapshot snapshot, Buffer buffer)
 {
+	if (relation->rd_rel->relpersistence == RELPERSISTENCE_SESSION && RecoveryInProgress())
+	{
+		AccessTempRelationAtReplica = true;
+		return TempTupleSatisfiesVisibility(tup, snapshot->curcid, buffer);
+	}
+	AccessTempRelationAtReplica = false;
+
 	switch (snapshot->snapshot_type)
 	{
 		case SNAPSHOT_MVCC:
diff --git a/src/backend/access/nbtree/nbtpage.c b/src/backend/access/nbtree/nbtpage.c
index 268f869..ed3ab70 100644
--- a/src/backend/access/nbtree/nbtpage.c
+++ b/src/backend/access/nbtree/nbtpage.c
@@ -763,7 +763,11 @@ _bt_getbuf(Relation rel, BlockNumber blkno, int access)
 		/* Read an existing block of the relation */
 		buf = ReadBuffer(rel, blkno);
 		LockBuffer(buf, access);
-		_bt_checkpage(rel, buf);
+		/* Session temporary relation may be not yet initialized for this backend. */
+		if (blkno == BTREE_METAPAGE && GlobalTempRelationPageIsNotInitialized(rel, BufferGetPage(buf)))
+			_bt_initmetapage(BufferGetPage(buf), P_NONE, 0);
+		else
+			_bt_checkpage(rel, buf);
 	}
 	else
 	{
diff --git a/src/backend/access/spgist/spgutils.c b/src/backend/access/spgist/spgutils.c
index 45472db..a8497a2 100644
--- a/src/backend/access/spgist/spgutils.c
+++ b/src/backend/access/spgist/spgutils.c
@@ -106,6 +106,7 @@ spgGetCache(Relation index)
 		spgConfigIn in;
 		FmgrInfo   *procinfo;
 		Buffer		metabuffer;
+		Page        metapage;
 		SpGistMetaPageData *metadata;
 
 		cache = MemoryContextAllocZero(index->rd_indexcxt,
@@ -155,12 +156,32 @@ spgGetCache(Relation index)
 		metabuffer = ReadBuffer(index, SPGIST_METAPAGE_BLKNO);
 		LockBuffer(metabuffer, BUFFER_LOCK_SHARE);
 
-		metadata = SpGistPageGetMeta(BufferGetPage(metabuffer));
+		metapage = BufferGetPage(metabuffer);
+		metadata = SpGistPageGetMeta(metapage);
 
 		if (metadata->magicNumber != SPGIST_MAGIC_NUMBER)
-			elog(ERROR, "index \"%s\" is not an SP-GiST index",
-				 RelationGetRelationName(index));
+		{
+			if (GlobalTempRelationPageIsNotInitialized(index, metapage))
+			{
+				Buffer rootbuffer = ReadBuffer(index, SPGIST_ROOT_BLKNO);
+				Buffer nullbuffer = ReadBuffer(index, SPGIST_NULL_BLKNO);
+
+				SpGistInitMetapage(metapage);
+
+				LockBuffer(rootbuffer, BUFFER_LOCK_EXCLUSIVE);
+				SpGistInitPage(BufferGetPage(rootbuffer), SPGIST_LEAF);
+				MarkBufferDirty(rootbuffer);
+				UnlockReleaseBuffer(rootbuffer);
 
+				LockBuffer(nullbuffer, BUFFER_LOCK_EXCLUSIVE);
+				SpGistInitPage(BufferGetPage(nullbuffer), SPGIST_LEAF | SPGIST_NULLS);
+				MarkBufferDirty(nullbuffer);
+				UnlockReleaseBuffer(nullbuffer);
+			}
+			else
+				elog(ERROR, "index \"%s\" is not an SP-GiST index",
+					 RelationGetRelationName(index));
+		}
 		cache->lastUsedPages = metadata->lastUsedPages;
 
 		UnlockReleaseBuffer(metabuffer);
diff --git a/src/backend/access/transam/transam.c b/src/backend/access/transam/transam.c
index 365ddfb..bce9c4a 100644
--- a/src/backend/access/transam/transam.c
+++ b/src/backend/access/transam/transam.c
@@ -22,6 +22,7 @@
 #include "access/clog.h"
 #include "access/subtrans.h"
 #include "access/transam.h"
+#include "access/xact.h"
 #include "utils/snapmgr.h"
 
 /*
@@ -126,6 +127,9 @@ TransactionIdDidCommit(TransactionId transactionId)
 {
 	XidStatus	xidstatus;
 
+	if (AccessTempRelationAtReplica)
+		return !IsReplicaCurrentTransactionId(transactionId) && !IsReplicaTransactionAborted(transactionId);
+
 	xidstatus = TransactionLogFetch(transactionId);
 
 	/*
@@ -182,6 +186,9 @@ TransactionIdDidAbort(TransactionId transactionId)
 {
 	XidStatus	xidstatus;
 
+	if (AccessTempRelationAtReplica)
+		return IsReplicaTransactionAborted(transactionId);
+
 	xidstatus = TransactionLogFetch(transactionId);
 
 	/*
diff --git a/src/backend/access/transam/varsup.c b/src/backend/access/transam/varsup.c
index b18eee4..fb3bebc 100644
--- a/src/backend/access/transam/varsup.c
+++ b/src/backend/access/transam/varsup.c
@@ -71,7 +71,7 @@ GetNewTransactionId(bool isSubXact)
 
 	/* safety check, we should never get this far in a HS standby */
 	if (RecoveryInProgress())
-		elog(ERROR, "cannot assign TransactionIds during recovery");
+   	    elog(ERROR, "cannot assign TransactionIds during recovery");
 
 	LWLockAcquire(XidGenLock, LW_EXCLUSIVE);
 
diff --git a/src/backend/access/transam/xact.c b/src/backend/access/transam/xact.c
index 9162286..cf6bf4e 100644
--- a/src/backend/access/transam/xact.c
+++ b/src/backend/access/transam/xact.c
@@ -192,6 +192,7 @@ typedef struct TransactionStateData
 	int			parallelModeLevel;	/* Enter/ExitParallelMode counter */
 	bool		chain;			/* start a new block after this one */
 	struct TransactionStateData *parent;	/* back link to parent */
+	TransactionId replicaTransactionId;    /* pseudo XID for inserting data in global temp tables at replica */
 } TransactionStateData;
 
 typedef TransactionStateData *TransactionState;
@@ -286,6 +287,12 @@ typedef struct XactCallbackItem
 
 static XactCallbackItem *Xact_callbacks = NULL;
 
+static TransactionId replicaTransIdCount = FirstNormalTransactionId;
+static TransactionId replicaTopTransId;
+static Bitmapset*    replicaAbortedXids;
+
+bool AccessTempRelationAtReplica;
+
 /*
  * List of add-on start- and end-of-subxact callbacks
  */
@@ -443,6 +450,48 @@ GetCurrentTransactionIdIfAny(void)
 }
 
 /*
+ * Transactions at replica can update only global temporary tables.
+ * Them are assigned backend-local XIDs which are independent from normal XIDs received from primary node.
+ * So tuples of temporary tables at replica requires special visibility rules.
+ *
+ * XIDs for such transactions at replica are created on demand (when tuple of temp table is updated).
+ * XID wrap-around and adjusting XID horizon is not supported. So number of such transactions at replica is
+ * limited by 2^32 and require up to 2^29 in-memory bitmap for marking aborted transactions.
+  */
+TransactionId
+GetReplicaTransactionId(void)
+{
+	TransactionState s = CurrentTransactionState;
+	if (!TransactionIdIsValid(s->replicaTransactionId))
+		s->replicaTransactionId = ++replicaTransIdCount;
+	return s->replicaTransactionId;
+}
+
+/*
+ * At replica transaction can update only temporary tables
+ * and them are assigned special XIDs (not related with normal XIDs received from primary node).
+ * As far as we see only own transaction it is not necessary to mark committed transactions.
+ * Only marking aborted ones is enough. All transactions which are not marked as aborted are treated as
+ * committed or self in-progress transactions.
+ */
+bool
+IsReplicaTransactionAborted(TransactionId xid)
+{
+	return bms_is_member(xid, replicaAbortedXids);
+}
+
+/*
+ * As far as XIDs for transactions at replica are generated individually for each backends,
+ * we can check that XID belongs to the current transaction or any of its subtransactions by
+ * just comparing it with XID of top transaction.
+ */
+bool
+IsReplicaCurrentTransactionId(TransactionId xid)
+{
+	return xid > replicaTopTransId;
+}
+
+/*
  *	GetTopFullTransactionId
  *
  * This will return the FullTransactionId of the main transaction, assigning
@@ -855,6 +904,9 @@ TransactionIdIsCurrentTransactionId(TransactionId xid)
 {
 	TransactionState s;
 
+	if (AccessTempRelationAtReplica)
+		return IsReplicaCurrentTransactionId(xid);
+
 	/*
 	 * We always say that BootstrapTransactionId is "not my transaction ID"
 	 * even when it is (ie, during bootstrap).  Along with the fact that
@@ -1206,7 +1258,7 @@ static TransactionId
 RecordTransactionCommit(void)
 {
 	TransactionId xid = GetTopTransactionIdIfAny();
-	bool		markXidCommitted = TransactionIdIsValid(xid);
+	bool		markXidCommitted = TransactionIdIsNormal(xid);
 	TransactionId latestXid = InvalidTransactionId;
 	int			nrels;
 	RelFileNode *rels;
@@ -1624,7 +1676,7 @@ RecordTransactionAbort(bool isSubXact)
 	 * rels to delete (note that this routine is not responsible for actually
 	 * deleting 'em).  We cannot have any child XIDs, either.
 	 */
-	if (!TransactionIdIsValid(xid))
+	if (!TransactionIdIsNormal(xid))
 	{
 		/* Reset XactLastRecEnd until the next transaction writes something */
 		if (!isSubXact)
@@ -1892,6 +1944,8 @@ StartTransaction(void)
 	s = &TopTransactionStateData;
 	CurrentTransactionState = s;
 
+	replicaTopTransId = replicaTransIdCount;
+
 	Assert(!FullTransactionIdIsValid(XactTopFullTransactionId));
 
 	/* check the current transaction state */
@@ -1905,6 +1959,7 @@ StartTransaction(void)
 	 */
 	s->state = TRANS_START;
 	s->fullTransactionId = InvalidFullTransactionId;	/* until assigned */
+	s->replicaTransactionId = InvalidTransactionId;	/* until assigned */
 
 	/* Determine if statements are logged in this transaction */
 	xact_is_sampled = log_xact_sample_rate != 0 &&
@@ -2570,6 +2625,14 @@ AbortTransaction(void)
 	/* Prevent cancel/die interrupt while cleaning up */
 	HOLD_INTERRUPTS();
 
+	/* Mark transactions involved global temp table at replica as aborted */
+	if (TransactionIdIsValid(s->replicaTransactionId))
+	{
+		MemoryContext ctx = MemoryContextSwitchTo(TopMemoryContext);
+		replicaAbortedXids = bms_add_member(replicaAbortedXids, s->replicaTransactionId);
+		MemoryContextSwitchTo(ctx);
+	}
+
 	/* Make sure we have a valid memory context and resource owner */
 	AtAbort_Memory();
 	AtAbort_ResourceOwner();
@@ -2991,6 +3054,9 @@ CommitTransactionCommand(void)
 			 * and then clean up.
 			 */
 		case TBLOCK_ABORT_PENDING:
+			if (GetCurrentTransactionIdIfAny() == FrozenTransactionId)
+				elog(FATAL, "Transaction is aborted at standby");
+
 			AbortTransaction();
 			CleanupTransaction();
 			s->blockState = TBLOCK_DEFAULT;
@@ -4880,6 +4946,14 @@ AbortSubTransaction(void)
 	/* Prevent cancel/die interrupt while cleaning up */
 	HOLD_INTERRUPTS();
 
+	/* Mark transactions involved global temp table at replica as aborted */
+	if (TransactionIdIsValid(s->replicaTransactionId))
+	{
+		MemoryContext ctx = MemoryContextSwitchTo(TopMemoryContext);
+		replicaAbortedXids = bms_add_member(replicaAbortedXids, s->replicaTransactionId);
+		MemoryContextSwitchTo(ctx);
+	}
+
 	/* Make sure we have a valid memory context and resource owner */
 	AtSubAbort_Memory();
 	AtSubAbort_ResourceOwner();
diff --git a/src/backend/access/transam/xloginsert.c b/src/backend/access/transam/xloginsert.c
index 3ec67d4..edec8ca 100644
--- a/src/backend/access/transam/xloginsert.c
+++ b/src/backend/access/transam/xloginsert.c
@@ -213,6 +213,7 @@ void
 XLogRegisterBuffer(uint8 block_id, Buffer buffer, uint8 flags)
 {
 	registered_buffer *regbuf;
+	RelFileNodeBackend rnode;
 
 	/* NO_IMAGE doesn't make sense with FORCE_IMAGE */
 	Assert(!((flags & REGBUF_FORCE_IMAGE) && (flags & (REGBUF_NO_IMAGE))));
@@ -227,7 +228,8 @@ XLogRegisterBuffer(uint8 block_id, Buffer buffer, uint8 flags)
 
 	regbuf = &registered_buffers[block_id];
 
-	BufferGetTag(buffer, &regbuf->rnode, &regbuf->forkno, &regbuf->block);
+	BufferGetTag(buffer, &rnode, &regbuf->forkno, &regbuf->block);
+	regbuf->rnode = rnode.node;
 	regbuf->page = BufferGetPage(buffer);
 	regbuf->flags = flags;
 	regbuf->rdata_tail = (XLogRecData *) &regbuf->rdata_head;
@@ -919,7 +921,7 @@ XLogSaveBufferForHint(Buffer buffer, bool buffer_std)
 		int			flags;
 		PGAlignedBlock copied_buffer;
 		char	   *origdata = (char *) BufferGetBlock(buffer);
-		RelFileNode rnode;
+		RelFileNodeBackend rnode;
 		ForkNumber	forkno;
 		BlockNumber blkno;
 
@@ -948,7 +950,7 @@ XLogSaveBufferForHint(Buffer buffer, bool buffer_std)
 			flags |= REGBUF_STANDARD;
 
 		BufferGetTag(buffer, &rnode, &forkno, &blkno);
-		XLogRegisterBlock(0, &rnode, forkno, blkno, copied_buffer.data, flags);
+		XLogRegisterBlock(0, &rnode.node, forkno, blkno, copied_buffer.data, flags);
 
 		recptr = XLogInsert(RM_XLOG_ID, XLOG_FPI_FOR_HINT);
 	}
@@ -1009,7 +1011,7 @@ XLogRecPtr
 log_newpage_buffer(Buffer buffer, bool page_std)
 {
 	Page		page = BufferGetPage(buffer);
-	RelFileNode rnode;
+	RelFileNodeBackend rnode;
 	ForkNumber	forkNum;
 	BlockNumber blkno;
 
@@ -1018,7 +1020,7 @@ log_newpage_buffer(Buffer buffer, bool page_std)
 
 	BufferGetTag(buffer, &rnode, &forkNum, &blkno);
 
-	return log_newpage(&rnode, forkNum, blkno, page, page_std);
+	return log_newpage(&rnode.node, forkNum, blkno, page, page_std);
 }
 
 /*
diff --git a/src/backend/catalog/catalog.c b/src/backend/catalog/catalog.c
index 1af31c2..e60bdb7 100644
--- a/src/backend/catalog/catalog.c
+++ b/src/backend/catalog/catalog.c
@@ -402,6 +402,9 @@ GetNewRelFileNode(Oid reltablespace, Relation pg_class, char relpersistence)
 		case RELPERSISTENCE_TEMP:
 			backend = BackendIdForTempRelations();
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 098732c..cb35c72 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3641,7 +3641,7 @@ reindex_relation(Oid relid, int flags, int options)
 		if (flags & REINDEX_REL_FORCE_INDEXES_UNLOGGED)
 			persistence = RELPERSISTENCE_UNLOGGED;
 		else if (flags & REINDEX_REL_FORCE_INDEXES_PERMANENT)
-			persistence = RELPERSISTENCE_PERMANENT;
+			persistence = rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ? RELPERSISTENCE_SESSION : RELPERSISTENCE_PERMANENT;
 		else
 			persistence = rel->rd_rel->relpersistence;
 
diff --git a/src/backend/catalog/storage.c b/src/backend/catalog/storage.c
index b8c9b6f..b06ff28 100644
--- a/src/backend/catalog/storage.c
+++ b/src/backend/catalog/storage.c
@@ -93,6 +93,10 @@ RelationCreateStorage(RelFileNode rnode, char relpersistence)
 			backend = InvalidBackendId;
 			needs_wal = false;
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			needs_wal = false;
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
 			needs_wal = true;
diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index a23128d..5d131a7 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -1400,7 +1400,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap,
 	 */
 	if (newrelpersistence == RELPERSISTENCE_UNLOGGED)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_UNLOGGED;
-	else if (newrelpersistence == RELPERSISTENCE_PERMANENT)
+	else if (newrelpersistence != RELPERSISTENCE_TEMP)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_PERMANENT;
 
 	/* Report that we are now reindexing relations */
diff --git a/src/backend/commands/sequence.c b/src/backend/commands/sequence.c
index a13322b..be661a4 100644
--- a/src/backend/commands/sequence.c
+++ b/src/backend/commands/sequence.c
@@ -94,7 +94,7 @@ static HTAB *seqhashtab = NULL; /* hash table for SeqTable items */
  */
 static SeqTableData *last_used_seq = NULL;
 
-static void fill_seq_with_data(Relation rel, HeapTuple tuple);
+static void fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf);
 static Relation lock_and_open_sequence(SeqTable seq);
 static void create_seq_hashtable(void);
 static void init_sequence(Oid relid, SeqTable *p_elm, Relation *p_rel);
@@ -222,7 +222,7 @@ DefineSequence(ParseState *pstate, CreateSeqStmt *seq)
 
 	/* now initialize the sequence's data */
 	tuple = heap_form_tuple(tupDesc, value, null);
-	fill_seq_with_data(rel, tuple);
+	fill_seq_with_data(rel, tuple, InvalidBuffer);
 
 	/* process OWNED BY if given */
 	if (owned_by)
@@ -327,7 +327,7 @@ ResetSequence(Oid seq_relid)
 	/*
 	 * Insert the modified tuple into the new storage file.
 	 */
-	fill_seq_with_data(seq_rel, tuple);
+	fill_seq_with_data(seq_rel, tuple, InvalidBuffer);
 
 	/* Clear local cache so that we don't think we have cached numbers */
 	/* Note that we do not change the currval() state */
@@ -340,18 +340,21 @@ ResetSequence(Oid seq_relid)
  * Initialize a sequence's relation with the specified tuple as content
  */
 static void
-fill_seq_with_data(Relation rel, HeapTuple tuple)
+fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf)
 {
-	Buffer		buf;
 	Page		page;
 	sequence_magic *sm;
 	OffsetNumber offnum;
+	bool lockBuffer = false;
 
 	/* Initialize first page of relation with special magic number */
 
-	buf = ReadBuffer(rel, P_NEW);
-	Assert(BufferGetBlockNumber(buf) == 0);
-
+	if (buf == InvalidBuffer)
+	{
+		buf = ReadBuffer(rel, P_NEW);
+		Assert(BufferGetBlockNumber(buf) == 0);
+		lockBuffer = true;
+	}
 	page = BufferGetPage(buf);
 
 	PageInit(page, BufferGetPageSize(buf), sizeof(sequence_magic));
@@ -360,7 +363,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	/* Now insert sequence tuple */
 
-	LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
+	if (lockBuffer)
+		LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
 
 	/*
 	 * Since VACUUM does not process sequences, we have to force the tuple to
@@ -410,7 +414,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	END_CRIT_SECTION();
 
-	UnlockReleaseBuffer(buf);
+	if (lockBuffer)
+		UnlockReleaseBuffer(buf);
 }
 
 /*
@@ -502,7 +507,7 @@ AlterSequence(ParseState *pstate, AlterSeqStmt *stmt)
 		/*
 		 * Insert the modified tuple into the new storage file.
 		 */
-		fill_seq_with_data(seqrel, newdatatuple);
+		fill_seq_with_data(seqrel, newdatatuple, InvalidBuffer);
 	}
 
 	/* process OWNED BY if given */
@@ -1178,6 +1183,17 @@ read_seq_tuple(Relation rel, Buffer *buf, HeapTuple seqdatatuple)
 	LockBuffer(*buf, BUFFER_LOCK_EXCLUSIVE);
 
 	page = BufferGetPage(*buf);
+	if (GlobalTempRelationPageIsNotInitialized(rel, page))
+	{
+		/* Initialize sequence for global temporary tables */
+		Datum		value[SEQ_COL_LASTCOL] = {0};
+		bool		null[SEQ_COL_LASTCOL] = {false};
+		HeapTuple tuple;
+		value[SEQ_COL_LASTVAL-1] = Int64GetDatumFast(1); /* start sequence with 1 */
+		tuple = heap_form_tuple(RelationGetDescr(rel), value, null);
+		fill_seq_with_data(rel, tuple, *buf);
+	}
+
 	sm = (sequence_magic *) PageGetSpecialPointer(page);
 
 	if (sm->magic != SEQ_MAGIC)
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 05593f3..73be898 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -586,7 +586,7 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 	 * Check consistency of arguments
 	 */
 	if (stmt->oncommit != ONCOMMIT_NOOP
-		&& stmt->relation->relpersistence != RELPERSISTENCE_TEMP)
+		&& !IsLocalRelpersistence(stmt->relation->relpersistence))
 		ereport(ERROR,
 				(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 				 errmsg("ON COMMIT can only be used on temporary tables")));
@@ -1771,7 +1771,8 @@ ExecuteTruncateGuts(List *explicit_rels, List *relids, List *relids_logged,
 		 * table or the current physical file to be thrown away anyway.
 		 */
 		if (rel->rd_createSubid == mySubid ||
-			rel->rd_newRelfilenodeSubid == mySubid)
+			rel->rd_newRelfilenodeSubid == mySubid ||
+			rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
 		{
 			/* Immediate, non-rollbackable truncation is OK */
 			heap_truncate_one_rel(rel);
@@ -7677,6 +7678,12 @@ ATAddForeignKeyConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
 						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 						 errmsg("constraints on unlogged tables may reference only permanent or unlogged tables")));
 			break;
+		case RELPERSISTENCE_SESSION:
+			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
+				ereport(ERROR,
+						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+						 errmsg("constraints on session tables may reference only session tables")));
+			break;
 		case RELPERSISTENCE_TEMP:
 			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_TEMP)
 				ereport(ERROR,
@@ -14109,6 +14116,13 @@ ATPrepChangePersistence(Relation rel, bool toLogged)
 							RelationGetRelationName(rel)),
 					 errtable(rel)));
 			break;
+		case RELPERSISTENCE_SESSION:
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+					 errmsg("cannot change logged status of session table \"%s\"",
+							RelationGetRelationName(rel)),
+					 errtable(rel)));
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			if (toLogged)
 				/* nothing to do */
@@ -14596,14 +14610,7 @@ PreCommit_on_commit_actions(void)
 				/* Do nothing (there shouldn't be such entries, actually) */
 				break;
 			case ONCOMMIT_DELETE_ROWS:
-
-				/*
-				 * If this transaction hasn't accessed any temporary
-				 * relations, we can skip truncating ON COMMIT DELETE ROWS
-				 * tables, as they must still be empty.
-				 */
-				if ((MyXactFlags & XACT_FLAGS_ACCESSEDTEMPNAMESPACE))
-					oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
+				oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
 				break;
 			case ONCOMMIT_DROP:
 				oids_to_drop = lappend_oid(oids_to_drop, oc->relid);
diff --git a/src/backend/executor/execMain.c b/src/backend/executor/execMain.c
index ea4b586..9cd8361 100644
--- a/src/backend/executor/execMain.c
+++ b/src/backend/executor/execMain.c
@@ -787,6 +787,9 @@ ExecCheckXactReadOnly(PlannedStmt *plannedstmt)
 		if (isTempNamespace(get_rel_namespace(rte->relid)))
 			continue;
 
+		if (get_rel_persistence(rte->relid) == RELPERSISTENCE_SESSION)
+			continue;
+
 		PreventCommandIfReadOnly(CreateCommandTag((Node *) plannedstmt));
 	}
 
diff --git a/src/backend/optimizer/util/plancat.c b/src/backend/optimizer/util/plancat.c
index cf17614..d673bd7 100644
--- a/src/backend/optimizer/util/plancat.c
+++ b/src/backend/optimizer/util/plancat.c
@@ -127,7 +127,7 @@ get_relation_info(PlannerInfo *root, Oid relationObjectId, bool inhparent,
 	relation = table_open(relationObjectId, NoLock);
 
 	/* Temporary and unlogged relations are inaccessible during recovery. */
-	if (!RelationNeedsWAL(relation) && RecoveryInProgress())
+	if (!RelationNeedsWAL(relation) && RecoveryInProgress() && relation->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
 		ereport(ERROR,
 				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
 				 errmsg("cannot access temporary or unlogged relations during recovery")));
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index 3f67aaf..565c868 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -3266,20 +3266,11 @@ OptTemp:	TEMPORARY					{ $$ = RELPERSISTENCE_TEMP; }
 			| TEMP						{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMPORARY			{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMP				{ $$ = RELPERSISTENCE_TEMP; }
-			| GLOBAL TEMPORARY
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
-			| GLOBAL TEMP
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
+			| GLOBAL TEMPORARY          { $$ = RELPERSISTENCE_SESSION; }
+			| GLOBAL TEMP               { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION                   { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMPORARY         { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMP              { $$ = RELPERSISTENCE_SESSION; }
 			| UNLOGGED					{ $$ = RELPERSISTENCE_UNLOGGED; }
 			| /*EMPTY*/					{ $$ = RELPERSISTENCE_PERMANENT; }
 		;
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index ee47547..ea7fe4c 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -437,6 +437,14 @@ generateSerialExtraStmts(CreateStmtContext *cxt, ColumnDef *column,
 	seqstmt->options = seqoptions;
 
 	/*
+	 * Why we should not always use persistence of parent table?
+	 * Although it is prohibited to have unlogged sequences,
+	 * unlogged tables with SERIAL fields are accepted!
+	 */
+	if (cxt->relation->relpersistence != RELPERSISTENCE_UNLOGGED)
+		seqstmt->sequence->relpersistence = cxt->relation->relpersistence;
+
+	/*
 	 * If a sequence data type was specified, add it to the options.  Prepend
 	 * to the list rather than append; in case a user supplied their own AS
 	 * clause, the "redundant options" error will point to their occurrence,
diff --git a/src/backend/postmaster/autovacuum.c b/src/backend/postmaster/autovacuum.c
index 073f313..5760a9c 100644
--- a/src/backend/postmaster/autovacuum.c
+++ b/src/backend/postmaster/autovacuum.c
@@ -2154,7 +2154,7 @@ do_autovacuum(void)
 		/*
 		 * We cannot safely process other backends' temp tables, so skip 'em.
 		 */
-		if (classForm->relpersistence == RELPERSISTENCE_TEMP)
+		if (IsLocalRelpersistence(classForm->relpersistence))
 			continue;
 
 		relid = classForm->oid;
diff --git a/src/backend/replication/logical/reorderbuffer.c b/src/backend/replication/logical/reorderbuffer.c
index 8ce28ad..a5d2de9 100644
--- a/src/backend/replication/logical/reorderbuffer.c
+++ b/src/backend/replication/logical/reorderbuffer.c
@@ -3487,6 +3487,7 @@ ResolveCminCmaxDuringDecoding(HTAB *tuplecid_data,
 {
 	ReorderBufferTupleCidKey key;
 	ReorderBufferTupleCidEnt *ent;
+	RelFileNodeBackend rnode;
 	ForkNumber	forkno;
 	BlockNumber blockno;
 	bool		updated_mapping = false;
@@ -3500,7 +3501,8 @@ ResolveCminCmaxDuringDecoding(HTAB *tuplecid_data,
 	 * get relfilenode from the buffer, no convenient way to access it other
 	 * than that.
 	 */
-	BufferGetTag(buffer, &key.relnode, &forkno, &blockno);
+	BufferGetTag(buffer, &rnode, &forkno, &blockno);
+	key.relnode = rnode.node;
 
 	/* tuples can only be in the main fork */
 	Assert(forkno == MAIN_FORKNUM);
diff --git a/src/backend/storage/buffer/bufmgr.c b/src/backend/storage/buffer/bufmgr.c
index 483f705..cdba076 100644
--- a/src/backend/storage/buffer/bufmgr.c
+++ b/src/backend/storage/buffer/bufmgr.c
@@ -556,7 +556,7 @@ PrefetchBuffer(Relation reln, ForkNumber forkNum, BlockNumber blockNum)
 		int			buf_id;
 
 		/* create a tag so we can lookup the buffer */
-		INIT_BUFFERTAG(newTag, reln->rd_smgr->smgr_rnode.node,
+		INIT_BUFFERTAG(newTag, reln->rd_smgr->smgr_rnode,
 					   forkNum, blockNum);
 
 		/* determine its hash code and partition lock ID */
@@ -710,7 +710,7 @@ ReadBuffer_common(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
 	Block		bufBlock;
 	bool		found;
 	bool		isExtend;
-	bool		isLocalBuf = SmgrIsTemp(smgr);
+	bool		isLocalBuf = SmgrIsTemp(smgr) && relpersistence == RELPERSISTENCE_TEMP;
 
 	*hit = false;
 
@@ -1010,7 +1010,7 @@ BufferAlloc(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
 	uint32		buf_state;
 
 	/* create a tag so we can lookup the buffer */
-	INIT_BUFFERTAG(newTag, smgr->smgr_rnode.node, forkNum, blockNum);
+	INIT_BUFFERTAG(newTag, smgr->smgr_rnode, forkNum, blockNum);
 
 	/* determine its hash code and partition lock ID */
 	newHash = BufTableHashCode(&newTag);
@@ -1532,7 +1532,8 @@ ReleaseAndReadBuffer(Buffer buffer,
 		{
 			bufHdr = GetLocalBufferDescriptor(-buffer - 1);
 			if (bufHdr->tag.blockNum == blockNum &&
-				RelFileNodeEquals(bufHdr->tag.rnode, relation->rd_node) &&
+				RelFileNodeEquals(bufHdr->tag.rnode.node, relation->rd_node) &&
+				bufHdr->tag.rnode.backend == relation->rd_backend &&
 				bufHdr->tag.forkNum == forkNum)
 				return buffer;
 			ResourceOwnerForgetBuffer(CurrentResourceOwner, buffer);
@@ -1543,7 +1544,8 @@ ReleaseAndReadBuffer(Buffer buffer,
 			bufHdr = GetBufferDescriptor(buffer - 1);
 			/* we have pin, so it's ok to examine tag without spinlock */
 			if (bufHdr->tag.blockNum == blockNum &&
-				RelFileNodeEquals(bufHdr->tag.rnode, relation->rd_node) &&
+				RelFileNodeEquals(bufHdr->tag.rnode.node, relation->rd_node) &&
+				bufHdr->tag.rnode.backend == relation->rd_backend &&
 				bufHdr->tag.forkNum == forkNum)
 				return buffer;
 			UnpinBuffer(bufHdr, true);
@@ -1845,8 +1847,8 @@ BufferSync(int flags)
 
 			item = &CkptBufferIds[num_to_scan++];
 			item->buf_id = buf_id;
-			item->tsId = bufHdr->tag.rnode.spcNode;
-			item->relNode = bufHdr->tag.rnode.relNode;
+			item->tsId = bufHdr->tag.rnode.node.spcNode;
+			item->relNode = bufHdr->tag.rnode.node.relNode;
 			item->forkNum = bufHdr->tag.forkNum;
 			item->blockNum = bufHdr->tag.blockNum;
 		}
@@ -2559,7 +2561,7 @@ PrintBufferLeakWarning(Buffer buffer)
 	}
 
 	/* theoretically we should lock the bufhdr here */
-	path = relpathbackend(buf->tag.rnode, backend, buf->tag.forkNum);
+	path = relpathbackend(buf->tag.rnode.node, backend, buf->tag.forkNum);
 	buf_state = pg_atomic_read_u32(&buf->state);
 	elog(WARNING,
 		 "buffer refcount leak: [%03d] "
@@ -2631,7 +2633,7 @@ BufferGetBlockNumber(Buffer buffer)
  *		a buffer.
  */
 void
-BufferGetTag(Buffer buffer, RelFileNode *rnode, ForkNumber *forknum,
+BufferGetTag(Buffer buffer, RelFileNodeBackend *rnode, ForkNumber *forknum,
 			 BlockNumber *blknum)
 {
 	BufferDesc *bufHdr;
@@ -2696,7 +2698,7 @@ FlushBuffer(BufferDesc *buf, SMgrRelation reln)
 
 	/* Find smgr relation for buffer */
 	if (reln == NULL)
-		reln = smgropen(buf->tag.rnode, InvalidBackendId);
+		reln = smgropen(buf->tag.rnode.node, buf->tag.rnode.backend);
 
 	TRACE_POSTGRESQL_BUFFER_FLUSH_START(buf->tag.forkNum,
 										buf->tag.blockNum,
@@ -2931,7 +2933,7 @@ DropRelFileNodeBuffers(RelFileNodeBackend rnode, ForkNumber *forkNum,
 	int			j;
 
 	/* If it's a local relation, it's localbuf.c's problem. */
-	if (RelFileNodeBackendIsTemp(rnode))
+	if (RelFileNodeBackendIsLocalTemp(rnode))
 	{
 		if (rnode.backend == MyBackendId)
 		{
@@ -2963,14 +2965,13 @@ DropRelFileNodeBuffers(RelFileNodeBackend rnode, ForkNumber *forkNum,
 		 * We could check forkNum and blockNum as well as the rnode, but the
 		 * incremental win from doing so seems small.
 		 */
-		if (!RelFileNodeEquals(bufHdr->tag.rnode, rnode.node))
+		if (!RelFileNodeBackendEquals(bufHdr->tag.rnode, rnode))
 			continue;
 
 		buf_state = LockBufHdr(bufHdr);
-
 		for (j = 0; j < nforks; j++)
 		{
-			if (RelFileNodeEquals(bufHdr->tag.rnode, rnode.node) &&
+			if (RelFileNodeBackendEquals(bufHdr->tag.rnode, rnode) &&
 				bufHdr->tag.forkNum == forkNum[j] &&
 				bufHdr->tag.blockNum >= firstDelBlock[j])
 			{
@@ -2997,24 +2998,24 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 {
 	int			i,
 				n = 0;
-	RelFileNode *nodes;
+	RelFileNodeBackend *nodes;
 	bool		use_bsearch;
 
 	if (nnodes == 0)
 		return;
 
-	nodes = palloc(sizeof(RelFileNode) * nnodes);	/* non-local relations */
+	nodes = palloc(sizeof(RelFileNodeBackend) * nnodes);	/* non-local relations */
 
 	/* If it's a local relation, it's localbuf.c's problem. */
 	for (i = 0; i < nnodes; i++)
 	{
-		if (RelFileNodeBackendIsTemp(rnodes[i]))
+		if (RelFileNodeBackendIsLocalTemp(rnodes[i]))
 		{
 			if (rnodes[i].backend == MyBackendId)
 				DropRelFileNodeAllLocalBuffers(rnodes[i].node);
 		}
 		else
-			nodes[n++] = rnodes[i].node;
+			nodes[n++] = rnodes[i];
 	}
 
 	/*
@@ -3037,11 +3038,11 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 
 	/* sort the list of rnodes if necessary */
 	if (use_bsearch)
-		pg_qsort(nodes, n, sizeof(RelFileNode), rnode_comparator);
+		pg_qsort(nodes, n, sizeof(RelFileNodeBackend), rnode_comparator);
 
 	for (i = 0; i < NBuffers; i++)
 	{
-		RelFileNode *rnode = NULL;
+		RelFileNodeBackend *rnode = NULL;
 		BufferDesc *bufHdr = GetBufferDescriptor(i);
 		uint32		buf_state;
 
@@ -3056,7 +3057,7 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 
 			for (j = 0; j < n; j++)
 			{
-				if (RelFileNodeEquals(bufHdr->tag.rnode, nodes[j]))
+				if (RelFileNodeBackendEquals(bufHdr->tag.rnode, nodes[j]))
 				{
 					rnode = &nodes[j];
 					break;
@@ -3066,7 +3067,7 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 		else
 		{
 			rnode = bsearch((const void *) &(bufHdr->tag.rnode),
-							nodes, n, sizeof(RelFileNode),
+							nodes, n, sizeof(RelFileNodeBackend),
 							rnode_comparator);
 		}
 
@@ -3075,7 +3076,7 @@ DropRelFileNodesAllBuffers(RelFileNodeBackend *rnodes, int nnodes)
 			continue;
 
 		buf_state = LockBufHdr(bufHdr);
-		if (RelFileNodeEquals(bufHdr->tag.rnode, (*rnode)))
+		if (RelFileNodeBackendEquals(bufHdr->tag.rnode, (*rnode)))
 			InvalidateBuffer(bufHdr);	/* releases spinlock */
 		else
 			UnlockBufHdr(bufHdr, buf_state);
@@ -3114,11 +3115,11 @@ DropDatabaseBuffers(Oid dbid)
 		 * As in DropRelFileNodeBuffers, an unlocked precheck should be safe
 		 * and saves some cycles.
 		 */
-		if (bufHdr->tag.rnode.dbNode != dbid)
+		if (bufHdr->tag.rnode.node.dbNode != dbid)
 			continue;
 
 		buf_state = LockBufHdr(bufHdr);
-		if (bufHdr->tag.rnode.dbNode == dbid)
+		if (bufHdr->tag.rnode.node.dbNode == dbid)
 			InvalidateBuffer(bufHdr);	/* releases spinlock */
 		else
 			UnlockBufHdr(bufHdr, buf_state);
@@ -3148,7 +3149,7 @@ PrintBufferDescs(void)
 			 "[%02d] (freeNext=%d, rel=%s, "
 			 "blockNum=%u, flags=0x%x, refcount=%u %d)",
 			 i, buf->freeNext,
-			 relpathbackend(buf->tag.rnode, InvalidBackendId, buf->tag.forkNum),
+			 relpath(buf->tag.rnode, buf->tag.forkNum),
 			 buf->tag.blockNum, buf->flags,
 			 buf->refcount, GetPrivateRefCount(b));
 	}
@@ -3216,7 +3217,8 @@ FlushRelationBuffers(Relation rel)
 			uint32		buf_state;
 
 			bufHdr = GetLocalBufferDescriptor(i);
-			if (RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node) &&
+			if (RelFileNodeEquals(bufHdr->tag.rnode.node, rel->rd_node) &&
+				bufHdr->tag.rnode.backend == rel->rd_backend &&
 				((buf_state = pg_atomic_read_u32(&bufHdr->state)) &
 				 (BM_VALID | BM_DIRTY)) == (BM_VALID | BM_DIRTY))
 			{
@@ -3263,13 +3265,15 @@ FlushRelationBuffers(Relation rel)
 		 * As in DropRelFileNodeBuffers, an unlocked precheck should be safe
 		 * and saves some cycles.
 		 */
-		if (!RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node))
+		if (!RelFileNodeEquals(bufHdr->tag.rnode.node, rel->rd_node)
+			|| bufHdr->tag.rnode.backend != rel->rd_backend)
 			continue;
 
 		ReservePrivateRefCountEntry();
 
 		buf_state = LockBufHdr(bufHdr);
-		if (RelFileNodeEquals(bufHdr->tag.rnode, rel->rd_node) &&
+		if (RelFileNodeEquals(bufHdr->tag.rnode.node, rel->rd_node) &&
+			bufHdr->tag.rnode.backend == rel->rd_backend &&
 			(buf_state & (BM_VALID | BM_DIRTY)) == (BM_VALID | BM_DIRTY))
 		{
 			PinBuffer_Locked(bufHdr);
@@ -3317,13 +3321,13 @@ FlushDatabaseBuffers(Oid dbid)
 		 * As in DropRelFileNodeBuffers, an unlocked precheck should be safe
 		 * and saves some cycles.
 		 */
-		if (bufHdr->tag.rnode.dbNode != dbid)
+		if (bufHdr->tag.rnode.node.dbNode != dbid)
 			continue;
 
 		ReservePrivateRefCountEntry();
 
 		buf_state = LockBufHdr(bufHdr);
-		if (bufHdr->tag.rnode.dbNode == dbid &&
+		if (bufHdr->tag.rnode.node.dbNode == dbid &&
 			(buf_state & (BM_VALID | BM_DIRTY)) == (BM_VALID | BM_DIRTY))
 		{
 			PinBuffer_Locked(bufHdr);
@@ -4063,7 +4067,7 @@ AbortBufferIO(void)
 				/* Buffer is pinned, so we can read tag without spinlock */
 				char	   *path;
 
-				path = relpathperm(buf->tag.rnode, buf->tag.forkNum);
+				path = relpath(buf->tag.rnode, buf->tag.forkNum);
 				ereport(WARNING,
 						(errcode(ERRCODE_IO_ERROR),
 						 errmsg("could not write block %u of %s",
@@ -4087,7 +4091,7 @@ shared_buffer_write_error_callback(void *arg)
 	/* Buffer is pinned, so we can read the tag without locking the spinlock */
 	if (bufHdr != NULL)
 	{
-		char	   *path = relpathperm(bufHdr->tag.rnode, bufHdr->tag.forkNum);
+		char	   *path = relpath(bufHdr->tag.rnode, bufHdr->tag.forkNum);
 
 		errcontext("writing block %u of relation %s",
 				   bufHdr->tag.blockNum, path);
@@ -4105,7 +4109,7 @@ local_buffer_write_error_callback(void *arg)
 
 	if (bufHdr != NULL)
 	{
-		char	   *path = relpathbackend(bufHdr->tag.rnode, MyBackendId,
+		char	   *path = relpathbackend(bufHdr->tag.rnode.node, MyBackendId,
 										  bufHdr->tag.forkNum);
 
 		errcontext("writing block %u of relation %s",
@@ -4120,22 +4124,27 @@ local_buffer_write_error_callback(void *arg)
 static int
 rnode_comparator(const void *p1, const void *p2)
 {
-	RelFileNode n1 = *(const RelFileNode *) p1;
-	RelFileNode n2 = *(const RelFileNode *) p2;
+	RelFileNodeBackend n1 = *(const RelFileNodeBackend *) p1;
+	RelFileNodeBackend n2 = *(const RelFileNodeBackend *) p2;
+
+	if (n1.node.relNode < n2.node.relNode)
+		return -1;
+	else if (n1.node.relNode > n2.node.relNode)
+		return 1;
 
-	if (n1.relNode < n2.relNode)
+	if (n1.node.dbNode < n2.node.dbNode)
 		return -1;
-	else if (n1.relNode > n2.relNode)
+	else if (n1.node.dbNode > n2.node.dbNode)
 		return 1;
 
-	if (n1.dbNode < n2.dbNode)
+	if (n1.node.spcNode < n2.node.spcNode)
 		return -1;
-	else if (n1.dbNode > n2.dbNode)
+	else if (n1.node.spcNode > n2.node.spcNode)
 		return 1;
 
-	if (n1.spcNode < n2.spcNode)
+	if (n1.backend < n2.backend)
 		return -1;
-	else if (n1.spcNode > n2.spcNode)
+	else if (n1.backend > n2.backend)
 		return 1;
 	else
 		return 0;
@@ -4371,7 +4380,7 @@ IssuePendingWritebacks(WritebackContext *context)
 			next = &context->pending_writebacks[i + ahead + 1];
 
 			/* different file, stop */
-			if (!RelFileNodeEquals(cur->tag.rnode, next->tag.rnode) ||
+			if (!RelFileNodeBackendEquals(cur->tag.rnode, next->tag.rnode) ||
 				cur->tag.forkNum != next->tag.forkNum)
 				break;
 
@@ -4390,7 +4399,7 @@ IssuePendingWritebacks(WritebackContext *context)
 		i += ahead;
 
 		/* and finally tell the kernel to write the data to storage */
-		reln = smgropen(tag.rnode, InvalidBackendId);
+		reln = smgropen(tag.rnode.node, tag.rnode.backend);
 		smgrwriteback(reln, tag.forkNum, tag.blockNum, nblocks);
 	}
 
diff --git a/src/backend/storage/buffer/localbuf.c b/src/backend/storage/buffer/localbuf.c
index f5f6a29..6bd5ecb 100644
--- a/src/backend/storage/buffer/localbuf.c
+++ b/src/backend/storage/buffer/localbuf.c
@@ -68,7 +68,7 @@ LocalPrefetchBuffer(SMgrRelation smgr, ForkNumber forkNum,
 	BufferTag	newTag;			/* identity of requested block */
 	LocalBufferLookupEnt *hresult;
 
-	INIT_BUFFERTAG(newTag, smgr->smgr_rnode.node, forkNum, blockNum);
+	INIT_BUFFERTAG(newTag, smgr->smgr_rnode, forkNum, blockNum);
 
 	/* Initialize local buffers if first request in this session */
 	if (LocalBufHash == NULL)
@@ -111,7 +111,7 @@ LocalBufferAlloc(SMgrRelation smgr, ForkNumber forkNum, BlockNumber blockNum,
 	bool		found;
 	uint32		buf_state;
 
-	INIT_BUFFERTAG(newTag, smgr->smgr_rnode.node, forkNum, blockNum);
+	INIT_BUFFERTAG(newTag, smgr->smgr_rnode, forkNum, blockNum);
 
 	/* Initialize local buffers if first request in this session */
 	if (LocalBufHash == NULL)
@@ -209,7 +209,7 @@ LocalBufferAlloc(SMgrRelation smgr, ForkNumber forkNum, BlockNumber blockNum,
 		Page		localpage = (char *) LocalBufHdrGetBlock(bufHdr);
 
 		/* Find smgr relation for buffer */
-		oreln = smgropen(bufHdr->tag.rnode, MyBackendId);
+		oreln = smgropen(bufHdr->tag.rnode.node, MyBackendId);
 
 		PageSetChecksumInplace(localpage, bufHdr->tag.blockNum);
 
@@ -331,14 +331,14 @@ DropRelFileNodeLocalBuffers(RelFileNode rnode, ForkNumber forkNum,
 		buf_state = pg_atomic_read_u32(&bufHdr->state);
 
 		if ((buf_state & BM_TAG_VALID) &&
-			RelFileNodeEquals(bufHdr->tag.rnode, rnode) &&
+			RelFileNodeEquals(bufHdr->tag.rnode.node, rnode) &&
 			bufHdr->tag.forkNum == forkNum &&
 			bufHdr->tag.blockNum >= firstDelBlock)
 		{
 			if (LocalRefCount[i] != 0)
 				elog(ERROR, "block %u of %s is still referenced (local %u)",
 					 bufHdr->tag.blockNum,
-					 relpathbackend(bufHdr->tag.rnode, MyBackendId,
+					 relpathbackend(bufHdr->tag.rnode.node, MyBackendId,
 									bufHdr->tag.forkNum),
 					 LocalRefCount[i]);
 			/* Remove entry from hashtable */
@@ -377,12 +377,12 @@ DropRelFileNodeAllLocalBuffers(RelFileNode rnode)
 		buf_state = pg_atomic_read_u32(&bufHdr->state);
 
 		if ((buf_state & BM_TAG_VALID) &&
-			RelFileNodeEquals(bufHdr->tag.rnode, rnode))
+			RelFileNodeEquals(bufHdr->tag.rnode.node, rnode))
 		{
 			if (LocalRefCount[i] != 0)
 				elog(ERROR, "block %u of %s is still referenced (local %u)",
 					 bufHdr->tag.blockNum,
-					 relpathbackend(bufHdr->tag.rnode, MyBackendId,
+					 relpathbackend(bufHdr->tag.rnode.node, MyBackendId,
 									bufHdr->tag.forkNum),
 					 LocalRefCount[i]);
 			/* Remove entry from hashtable */
diff --git a/src/backend/storage/freespace/fsmpage.c b/src/backend/storage/freespace/fsmpage.c
index cf7f03f..65eb422 100644
--- a/src/backend/storage/freespace/fsmpage.c
+++ b/src/backend/storage/freespace/fsmpage.c
@@ -268,13 +268,13 @@ restart:
 			 *
 			 * Fix the corruption and restart.
 			 */
-			RelFileNode rnode;
+			RelFileNodeBackend rnode;
 			ForkNumber	forknum;
 			BlockNumber blknum;
 
 			BufferGetTag(buf, &rnode, &forknum, &blknum);
 			elog(DEBUG1, "fixing corrupt FSM block %u, relation %u/%u/%u",
-				 blknum, rnode.spcNode, rnode.dbNode, rnode.relNode);
+				 blknum, rnode.node.spcNode, rnode.node.dbNode, rnode.node.relNode);
 
 			/* make sure we hold an exclusive lock */
 			if (!exclusive_lock_held)
diff --git a/src/backend/storage/ipc/procarray.c b/src/backend/storage/ipc/procarray.c
index 8abcfdf..07739e2 100644
--- a/src/backend/storage/ipc/procarray.c
+++ b/src/backend/storage/ipc/procarray.c
@@ -991,6 +991,9 @@ TransactionIdIsInProgress(TransactionId xid)
 	int			i,
 				j;
 
+	if (AccessTempRelationAtReplica)
+		return IsReplicaCurrentTransactionId(xid) && !IsReplicaTransactionAborted(xid);
+
 	/*
 	 * Don't bother checking a transaction older than RecentXmin; it could not
 	 * possibly still be running.  (Note: in particular, this guarantees that
diff --git a/src/backend/storage/smgr/md.c b/src/backend/storage/smgr/md.c
index 07f3c93..204c4cb 100644
--- a/src/backend/storage/smgr/md.c
+++ b/src/backend/storage/smgr/md.c
@@ -33,6 +33,7 @@
 #include "postmaster/bgwriter.h"
 #include "storage/fd.h"
 #include "storage/bufmgr.h"
+#include "storage/ipc.h"
 #include "storage/md.h"
 #include "storage/relfilenode.h"
 #include "storage/smgr.h"
@@ -87,6 +88,18 @@ typedef struct _MdfdVec
 
 static MemoryContext MdCxt;		/* context for all MdfdVec objects */
 
+/*
+ * Structure used to collect information created by this backend.
+ * Data of this related should be deleted on backend exit.
+ */
+typedef struct SessionRelation
+{
+	RelFileNodeBackend rnode;
+	struct SessionRelation* next;
+} SessionRelation;
+
+
+static SessionRelation* SessionRelations;
 
 /* Populate a file tag describing an md.c segment file. */
 #define INIT_MD_FILETAG(a,xx_rnode,xx_forknum,xx_segno) \
@@ -152,6 +165,48 @@ mdinit(void)
 								  ALLOCSET_DEFAULT_SIZES);
 }
 
+
+/*
+ * Delete all data of session relations and remove their pages from shared buffers.
+ * This function is called on backend exit.
+ */
+static void
+TruncateSessionRelations(int code, Datum arg)
+{
+	SessionRelation* rel;
+	for (rel = SessionRelations; rel != NULL; rel = rel->next)
+	{
+		/* Remove relation pages from shared buffers */
+		DropRelFileNodesAllBuffers(&rel->rnode, 1);
+
+		/* Delete relation files */
+		mdunlink(rel->rnode, InvalidForkNumber, false);
+	}
+}
+
+/*
+ * Maintain information about session relations accessed by this backend.
+ * This list is needed to perform cleanup on backend exit.
+ * Session relation is linked in this list when this relation is created or opened and file doesn't exist.
+ * Such procedure guarantee that each relation is linked into list only once.
+ */
+static void
+RegisterSessionRelation(SMgrRelation reln)
+{
+	SessionRelation* rel = (SessionRelation*)MemoryContextAlloc(TopMemoryContext, sizeof(SessionRelation));
+
+	/*
+	 * Perform session relation cleanup on backend exit. We are using shared memory hook, because
+	 * cleanup should be performed before backend is disconnected from shared memory.
+	 */
+	if (SessionRelations == NULL)
+		on_shmem_exit(TruncateSessionRelations, 0);
+
+	rel->rnode = reln->smgr_rnode;
+	rel->next = SessionRelations;
+	SessionRelations = rel;
+}
+
 /*
  *	mdexists() -- Does the physical file exist?
  *
@@ -218,6 +273,8 @@ mdcreate(SMgrRelation reln, ForkNumber forkNum, bool isRedo)
 					 errmsg("could not create file \"%s\": %m", path)));
 		}
 	}
+	if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		RegisterSessionRelation(reln);
 
 	pfree(path);
 
@@ -465,6 +522,19 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 
 	if (fd < 0)
 	{
+		/*
+		 * In case of session relation access, there may be no yet files of this relation for this backend.
+		 * If so, then create file and register session relation for truncation on backend exit.
+		 */
+		if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
+			fd = PathNameOpenFile(path, O_RDWR | PG_BINARY | O_CREAT);
+			if (fd >= 0)
+			{
+				RegisterSessionRelation(reln);
+				goto NewSegment;
+			}
+		}
 		if ((behavior & EXTENSION_RETURN_NULL) &&
 			FILE_POSSIBLY_DELETED(errno))
 		{
@@ -476,6 +546,7 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 				 errmsg("could not open file \"%s\": %m", path)));
 	}
 
+  NewSegment:
 	pfree(path);
 
 	_fdvec_resize(reln, forknum, 1);
@@ -652,8 +723,13 @@ mdread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
 		 * complaining.  This allows, for example, the case of trying to
 		 * update a block that was later truncated away.
 		 */
-		if (zero_damaged_pages || InRecovery)
+		if (zero_damaged_pages || InRecovery || RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
 			MemSet(buffer, 0, BLCKSZ);
+			/* In case of session relation we need to write zero page to provide correct result of subsequent mdnblocks */
+			if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+				mdwrite(reln, forknum, blocknum, buffer, true);
+		}
 		else
 			ereport(ERROR,
 					(errcode(ERRCODE_DATA_CORRUPTED),
@@ -738,12 +814,18 @@ mdwrite(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
 BlockNumber
 mdnblocks(SMgrRelation reln, ForkNumber forknum)
 {
-	MdfdVec    *v = mdopenfork(reln, forknum, EXTENSION_FAIL);
+	/*
+	 * If we access session relation, there may be no files yet of this relation for this backend.
+	 * Pass EXTENSION_RETURN_NULL to make mdopen return NULL in this case instead of reporting error.
+	 */
+	MdfdVec    *v = mdopenfork(reln, forknum, RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode)
+							   ? EXTENSION_RETURN_NULL : EXTENSION_FAIL);
 	BlockNumber nblocks;
 	BlockNumber segno = 0;
 
 	/* mdopen has opened the first segment */
-	Assert(reln->md_num_open_segs[forknum] > 0);
+	if (reln->md_num_open_segs[forknum] == 0)
+		return 0;
 
 	/*
 	 * Start from the last open segments, to avoid redundant seeks.  We have
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index a87e721..2401361 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -994,6 +994,9 @@ pg_relation_filepath(PG_FUNCTION_ARGS)
 	/* Determine owning backend. */
 	switch (relform->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c
index 585dcee..ce8852c 100644
--- a/src/backend/utils/cache/relcache.c
+++ b/src/backend/utils/cache/relcache.c
@@ -1098,6 +1098,10 @@ RelationBuildDesc(Oid targetRelId, bool insertIt)
 	relation->rd_newRelfilenodeSubid = InvalidSubTransactionId;
 	switch (relation->rd_rel->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			relation->rd_backend = BackendIdForSessionRelations();
+			relation->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			relation->rd_backend = InvalidBackendId;
@@ -3301,6 +3305,10 @@ RelationBuildLocalRelation(const char *relname,
 	rel->rd_rel->relpersistence = relpersistence;
 	switch (relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			rel->rd_backend = BackendIdForSessionRelations();
+			rel->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			rel->rd_backend = InvalidBackendId;
diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
index f01fea5..4162976 100644
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -15602,8 +15602,8 @@ dumpTableSchema(Archive *fout, TableInfo *tbinfo)
 											 tbinfo->dobj.catId.oid, false);
 
 		appendPQExpBuffer(q, "CREATE %s%s %s",
-						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ?
-						  "UNLOGGED " : "",
+						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ? "UNLOGGED "
+						  : tbinfo->relpersistence == RELPERSISTENCE_SESSION ? "SESSION " : "",
 						  reltypename,
 						  qualrelname);
 
diff --git a/src/common/relpath.c b/src/common/relpath.c
index 62b9553..cef99d2 100644
--- a/src/common/relpath.c
+++ b/src/common/relpath.c
@@ -166,7 +166,18 @@ GetRelationPath(Oid dbNode, Oid spcNode, Oid relNode,
 		}
 		else
 		{
-			if (forkNumber != MAIN_FORKNUM)
+			/*
+			 * Session relations are distinguished from local temp relations by adding
+			 * SessionRelFirstBackendId offset to backendId.
+			 * These is no need to separate them at file system level, so just subtract SessionRelFirstBackendId
+			 * to avoid too long file names.
+			 * Segments of session relations have the same prefix (t%d_) as local temporary relations
+			 * to make it possible to cleanup them in the same way as local temporary relation files.
+			 */
+			 if (backendId >= SessionRelFirstBackendId)
+				 backendId -= SessionRelFirstBackendId;
+
+			 if (forkNumber != MAIN_FORKNUM)
 				path = psprintf("base/%u/t%d_%u_%s",
 								dbNode, backendId, relNode,
 								forkNames[forkNumber]);
diff --git a/src/include/access/heapam.h b/src/include/access/heapam.h
index 858bcb6..2f16c58 100644
--- a/src/include/access/heapam.h
+++ b/src/include/access/heapam.h
@@ -195,9 +195,9 @@ extern void heap_vacuum_rel(Relation onerel,
 							struct VacuumParams *params, BufferAccessStrategy bstrategy);
 
 /* in heap/heapam_visibility.c */
-extern bool HeapTupleSatisfiesVisibility(HeapTuple stup, Snapshot snapshot,
+extern bool HeapTupleSatisfiesVisibility(Relation relation, HeapTuple stup, Snapshot snapshot,
 										 Buffer buffer);
-extern TM_Result HeapTupleSatisfiesUpdate(HeapTuple stup, CommandId curcid,
+extern TM_Result HeapTupleSatisfiesUpdate(Relation relation, HeapTuple stup, CommandId curcid,
 										  Buffer buffer);
 extern HTSV_Result HeapTupleSatisfiesVacuum(HeapTuple stup, TransactionId OldestXmin,
 											Buffer buffer);
diff --git a/src/include/access/xact.h b/src/include/access/xact.h
index d714551..cbe6760 100644
--- a/src/include/access/xact.h
+++ b/src/include/access/xact.h
@@ -41,6 +41,9 @@
 extern int	DefaultXactIsoLevel;
 extern PGDLLIMPORT int XactIsoLevel;
 
+extern bool AccessTempRelationAtReplica;
+
+
 /*
  * We implement three isolation levels internally.
  * The two stronger ones use one snapshot per database transaction;
@@ -440,4 +443,8 @@ extern void EnterParallelMode(void);
 extern void ExitParallelMode(void);
 extern bool IsInParallelMode(void);
 
+extern TransactionId GetReplicaTransactionId(void);
+extern bool IsReplicaTransactionAborted(TransactionId xid);
+extern bool IsReplicaCurrentTransactionId(TransactionId xid);
+
 #endif							/* XACT_H */
diff --git a/src/include/catalog/pg_class.h b/src/include/catalog/pg_class.h
index 090b6ba..6a39663 100644
--- a/src/include/catalog/pg_class.h
+++ b/src/include/catalog/pg_class.h
@@ -165,6 +165,7 @@ typedef FormData_pg_class *Form_pg_class;
 #define		  RELPERSISTENCE_PERMANENT	'p' /* regular table */
 #define		  RELPERSISTENCE_UNLOGGED	'u' /* unlogged permanent table */
 #define		  RELPERSISTENCE_TEMP		't' /* temporary table */
+#define		  RELPERSISTENCE_SESSION	's' /* session table */
 
 /* default selection for replica identity (primary key or nothing) */
 #define		  REPLICA_IDENTITY_DEFAULT	'd'
diff --git a/src/include/storage/backendid.h b/src/include/storage/backendid.h
index 70ef8eb..f226e7c 100644
--- a/src/include/storage/backendid.h
+++ b/src/include/storage/backendid.h
@@ -22,6 +22,13 @@ typedef int BackendId;			/* unique currently active backend identifier */
 
 #define InvalidBackendId		(-1)
 
+/*
+ * We need to distinguish local and global temporary relations by RelFileNodeBackend.
+ * The least invasive change is to add some special bias value to backend id (since 
+ * maximal number of backed is limited by MaxBackends).
+ */
+#define SessionRelFirstBackendId (0x40000000)
+
 extern PGDLLIMPORT BackendId MyBackendId;	/* backend id of this backend */
 
 /* backend id of our parallel session leader, or InvalidBackendId if none */
@@ -34,4 +41,10 @@ extern PGDLLIMPORT BackendId ParallelMasterBackendId;
 #define BackendIdForTempRelations() \
 	(ParallelMasterBackendId == InvalidBackendId ? MyBackendId : ParallelMasterBackendId)
 
+
+#define BackendIdForSessionRelations() \
+	(BackendIdForTempRelations() + SessionRelFirstBackendId)
+
+#define IsSessionRelationBackendId(id) ((id) >= SessionRelFirstBackendId)
+
 #endif							/* BACKENDID_H */
diff --git a/src/include/storage/buf_internals.h b/src/include/storage/buf_internals.h
index 6ffe184..efaf362 100644
--- a/src/include/storage/buf_internals.h
+++ b/src/include/storage/buf_internals.h
@@ -90,16 +90,17 @@
  */
 typedef struct buftag
 {
-	RelFileNode rnode;			/* physical relation identifier */
+	RelFileNodeBackend rnode;			/* physical relation identifier */
 	ForkNumber	forkNum;
 	BlockNumber blockNum;		/* blknum relative to begin of reln */
 } BufferTag;
 
 #define CLEAR_BUFFERTAG(a) \
 ( \
-	(a).rnode.spcNode = InvalidOid, \
-	(a).rnode.dbNode = InvalidOid, \
-	(a).rnode.relNode = InvalidOid, \
+	(a).rnode.node.spcNode = InvalidOid, \
+	(a).rnode.node.dbNode = InvalidOid, \
+	(a).rnode.node.relNode = InvalidOid, \
+	(a).rnode.backend = InvalidBackendId, \
 	(a).forkNum = InvalidForkNumber, \
 	(a).blockNum = InvalidBlockNumber \
 )
@@ -113,7 +114,7 @@ typedef struct buftag
 
 #define BUFFERTAGS_EQUAL(a,b) \
 ( \
-	RelFileNodeEquals((a).rnode, (b).rnode) && \
+	RelFileNodeBackendEquals((a).rnode, (b).rnode) && \
 	(a).blockNum == (b).blockNum && \
 	(a).forkNum == (b).forkNum \
 )
diff --git a/src/include/storage/bufmgr.h b/src/include/storage/bufmgr.h
index 17b97f7..1b0ce65 100644
--- a/src/include/storage/bufmgr.h
+++ b/src/include/storage/bufmgr.h
@@ -205,7 +205,7 @@ extern XLogRecPtr BufferGetLSNAtomic(Buffer buffer);
 extern void PrintPinnedBufs(void);
 #endif
 extern Size BufferShmemSize(void);
-extern void BufferGetTag(Buffer buffer, RelFileNode *rnode,
+extern void BufferGetTag(Buffer buffer, RelFileNodeBackend *rnode,
 						 ForkNumber *forknum, BlockNumber *blknum);
 
 extern void MarkBufferDirtyHint(Buffer buffer, bool buffer_std);
diff --git a/src/include/storage/bufpage.h b/src/include/storage/bufpage.h
index 4ef6d8d..bac7a31 100644
--- a/src/include/storage/bufpage.h
+++ b/src/include/storage/bufpage.h
@@ -229,6 +229,13 @@ typedef PageHeaderData *PageHeader;
 #define PageIsNew(page) (((PageHeader) (page))->pd_upper == 0)
 
 /*
+ * Page of temporary relation is not initialized
+ */
+#define GlobalTempRelationPageIsNotInitialized(rel, page) \
+	((rel)->rd_rel->relpersistence == RELPERSISTENCE_SESSION && PageIsNew(page))
+
+
+/*
  * PageGetItemId
  *		Returns an item identifier of a page.
  */
diff --git a/src/include/storage/relfilenode.h b/src/include/storage/relfilenode.h
index 586500a..20aec72 100644
--- a/src/include/storage/relfilenode.h
+++ b/src/include/storage/relfilenode.h
@@ -75,10 +75,25 @@ typedef struct RelFileNodeBackend
 	BackendId	backend;
 } RelFileNodeBackend;
 
+/*
+ * Check whether it is local or global temporary relation, which data belongs only to one backend.
+ */
 #define RelFileNodeBackendIsTemp(rnode) \
 	((rnode).backend != InvalidBackendId)
 
 /*
+ * Check whether it is global temporary relation which metadata is shared by all sessions,
+ * but data is private for the current session.
+ */
+#define RelFileNodeBackendIsGlobalTemp(rnode) IsSessionRelationBackendId((rnode).backend)
+
+/*
+ * Check whether it is local temporary relation which exists only in this backend.
+ */
+#define RelFileNodeBackendIsLocalTemp(rnode) \
+	(RelFileNodeBackendIsTemp(rnode) && !RelFileNodeBackendIsGlobalTemp(rnode))
+
+/*
  * Note: RelFileNodeEquals and RelFileNodeBackendEquals compare relNode first
  * since that is most likely to be different in two unequal RelFileNodes.  It
  * is probably redundant to compare spcNode if the other fields are found equal,
diff --git a/src/include/utils/rel.h b/src/include/utils/rel.h
index a5cf804..4bcfea1 100644
--- a/src/include/utils/rel.h
+++ b/src/include/utils/rel.h
@@ -327,6 +327,18 @@ typedef struct StdRdOptions
 	((relation)->rd_options ? \
 	 ((StdRdOptions *) (relation)->rd_options)->parallel_workers : (defaultpw))
 
+/*
+ * Relation persistence is either TEMP either SESSION
+ */
+#define IsLocalRelpersistence(relpersistence) \
+	((relpersistence) == RELPERSISTENCE_TEMP || (relpersistence) == RELPERSISTENCE_SESSION)
+
+/*
+ * Relation is either global either local temp table
+ */
+#define RelationHasSessionScope(relation) \
+	IsLocalRelpersistence(((relation)->rd_rel->relpersistence))
+
 /* ViewOptions->check_option values */
 typedef enum ViewOptCheckOption
 {
diff --git a/src/test/isolation/expected/inherit-global-temp.out b/src/test/isolation/expected/inherit-global-temp.out
new file mode 100644
index 0000000..6114f8c
--- /dev/null
+++ b/src/test/isolation/expected/inherit-global-temp.out
@@ -0,0 +1,218 @@
+Parsed test spec with 2 sessions
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_update_p s1_update_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_update_p: UPDATE inh_global_parent SET a = 11 WHERE a = 1;
+step s1_update_c: UPDATE inh_global_parent SET a = 13 WHERE a IN (3, 5);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+2              
+11             
+4              
+13             
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+4              
+13             
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+2              
+11             
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_update_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_update_c: UPDATE inh_global_parent SET a = 15 WHERE a IN (3, 5);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+6              
+15             
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+6              
+15             
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_delete_p s1_delete_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_delete_p: DELETE FROM inh_global_parent WHERE a = 2;
+step s1_delete_c: DELETE FROM inh_global_parent WHERE a IN (4, 6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+3              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_delete_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_delete_c: DELETE FROM inh_global_parent WHERE a IN (4, 6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+5              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_truncate_p s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_truncate_p s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_truncate_p: TRUNCATE inh_global_parent;
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_begin s1_truncate_p s2_select_p s1_commit
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_begin: BEGIN;
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s2_select_p: SELECT a FROM inh_global_parent; <waiting ...>
+step s1_commit: COMMIT;
+step s2_select_p: <... completed>
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_begin s1_truncate_p s2_select_c s1_commit
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_begin: BEGIN;
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2; <waiting ...>
+step s1_commit: COMMIT;
+step s2_select_c: <... completed>
+a              
+
+5              
+6              
diff --git a/src/test/isolation/isolation_schedule b/src/test/isolation/isolation_schedule
index 69ae227..95919f8 100644
--- a/src/test/isolation/isolation_schedule
+++ b/src/test/isolation/isolation_schedule
@@ -87,3 +87,4 @@ test: plpgsql-toast
 test: truncate-conflict
 test: serializable-parallel
 test: serializable-parallel-2
+test: inherit-global-temp
diff --git a/src/test/isolation/specs/inherit-global-temp.spec b/src/test/isolation/specs/inherit-global-temp.spec
new file mode 100644
index 0000000..5e95dd6
--- /dev/null
+++ b/src/test/isolation/specs/inherit-global-temp.spec
@@ -0,0 +1,73 @@
+# This is a copy of the inherit-temp test with little changes for global temporary tables.
+#
+
+setup
+{
+  CREATE TABLE inh_global_parent (a int);
+}
+
+teardown
+{
+  DROP TABLE inh_global_parent;
+}
+
+# Session 1 executes actions which act directly on both the parent and
+# its child.  Abbreviation "c" is used for queries working on the child
+# and "p" on the parent.
+session "s1"
+setup
+{
+  CREATE GLOBAL TEMPORARY TABLE inh_global_temp_child_s1 () INHERITS (inh_global_parent);
+}
+step "s1_begin" { BEGIN; }
+step "s1_truncate_p" { TRUNCATE inh_global_parent; }
+step "s1_select_p" { SELECT a FROM inh_global_parent; }
+step "s1_select_c" { SELECT a FROM inh_global_temp_child_s1; }
+step "s1_insert_p" { INSERT INTO inh_global_parent VALUES (1), (2); }
+step "s1_insert_c" { INSERT INTO inh_global_temp_child_s1 VALUES (3), (4); }
+step "s1_update_p" { UPDATE inh_global_parent SET a = 11 WHERE a = 1; }
+step "s1_update_c" { UPDATE inh_global_parent SET a = 13 WHERE a IN (3, 5); }
+step "s1_delete_p" { DELETE FROM inh_global_parent WHERE a = 2; }
+step "s1_delete_c" { DELETE FROM inh_global_parent WHERE a IN (4, 6); }
+step "s1_commit" { COMMIT; }
+teardown
+{
+  DROP TABLE inh_global_temp_child_s1;
+}
+
+# Session 2 executes actions on the parent which act only on the child.
+session "s2"
+setup
+{
+  CREATE GLOBAL TEMPORARY TABLE inh_global_temp_child_s2 () INHERITS (inh_global_parent);
+}
+step "s2_truncate_p" { TRUNCATE inh_global_parent; }
+step "s2_select_p" { SELECT a FROM inh_global_parent; }
+step "s2_select_c" { SELECT a FROM inh_global_temp_child_s2; }
+step "s2_insert_c" { INSERT INTO inh_global_temp_child_s2 VALUES (5), (6); }
+step "s2_update_c" { UPDATE inh_global_parent SET a = 15 WHERE a IN (3, 5); }
+step "s2_delete_c" { DELETE FROM inh_global_parent WHERE a IN (4, 6); }
+teardown
+{
+  DROP TABLE inh_global_temp_child_s2;
+}
+
+# Check INSERT behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check UPDATE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_update_p" "s1_update_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_update_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check DELETE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_delete_p" "s1_delete_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_delete_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check TRUNCATE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_truncate_p" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_truncate_p" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# TRUNCATE on a parent tree does not block access to temporary child relation
+# of another session, and blocks when scanning the parent.
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_begin" "s1_truncate_p" "s2_select_p" "s1_commit"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_begin" "s1_truncate_p" "s2_select_c" "s1_commit"
diff --git a/src/test/regress/expected/global_temp.out b/src/test/regress/expected/global_temp.out
new file mode 100644
index 0000000..b7bf067
--- /dev/null
+++ b/src/test/regress/expected/global_temp.out
@@ -0,0 +1,323 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+-- Test ON COMMIT DELETE ROWS
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+   2
+(2 rows)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+(1 row)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+ col 
+-----
+   1
+(1 row)
+
+SELECT * FROM global_temptest2;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest2;
+DROP TABLE global_temptest1;
+-- Unsupported ON COMMIT and foreign key combination
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+ERROR:  unsupported ON COMMIT and foreign key combination
+DETAIL:  Table "global_temptest4" references "global_temptest3", but they do not have the same ON COMMIT setting.
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+ a 
+---
+(0 rows)
+
+DROP TABLE temp_parted_oncommit;
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+              relname              
+-----------------------------------
+ global_temp_parted_oncommit_test
+ global_temp_parted_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_parted_oncommit_test;
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+            relname             
+--------------------------------
+ global_temp_inh_oncommit_test
+ global_temp_inh_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ERROR:  cannot inherit from temporary relation "global_temp_table"
+ROLLBACK;
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM global_temp_table;
+ a 
+---
+ 1
+(1 row)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+(2 rows)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       1
+(1 row)
+
+\c
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+(0 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       2
+(1 row)
+
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       3
+(1 row)
+
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
+-- Test two phase commit
+CREATE TABLE global_temptest_persistent(col int);
+CREATE GLOBAL TEMP TABLE global_temptest(col int);
+INSERT INTO global_temptest VALUES (1);
+BEGIN;
+INSERT INTO global_temptest VALUES (2);
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+   2
+(2 rows)
+
+PREPARE TRANSACTION 'global_temp1';
+-- We can't see anything from an uncommitted transaction
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+(1 row)
+
+BEGIN;
+INSERT INTO global_temptest VALUES (3);
+INSERT INTO global_temptest_persistent SELECT * FROM global_temptest;
+PREPARE TRANSACTION 'global_temp2';
+COMMIT PREPARED 'global_temp1';
+-- 1, 2
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+   2
+(2 rows)
+
+-- Nothing
+SELECT * FROM global_temptest_persistent;
+ col 
+-----
+(0 rows)
+
+\c
+-- The temp table is empty now.
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+-- Still nothing in global_temptest_persistent table;
+SELECT * FROM global_temptest_persistent;
+ col 
+-----
+(0 rows)
+
+INSERT INTO global_temptest VALUES (4);
+COMMIT PREPARED 'global_temp2';
+-- Only 4
+SELECT * FROM global_temptest;
+ col 
+-----
+   4
+(1 row)
+
+-- 1, 3
+SELECT * FROM global_temptest_persistent;
+ col 
+-----
+   1
+   3
+(2 rows)
+
+\c
+DROP TABLE global_temptest;
+DROP TABLE global_temptest_persistent;
diff --git a/src/test/regress/expected/global_temp_0.out b/src/test/regress/expected/global_temp_0.out
new file mode 100644
index 0000000..934e751
--- /dev/null
+++ b/src/test/regress/expected/global_temp_0.out
@@ -0,0 +1,326 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+-- Test ON COMMIT DELETE ROWS
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+   2
+(2 rows)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+(1 row)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+ col 
+-----
+   1
+(1 row)
+
+SELECT * FROM global_temptest2;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest2;
+DROP TABLE global_temptest1;
+-- Unsupported ON COMMIT and foreign key combination
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+ERROR:  unsupported ON COMMIT and foreign key combination
+DETAIL:  Table "global_temptest4" references "global_temptest3", but they do not have the same ON COMMIT setting.
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+ a 
+---
+(0 rows)
+
+DROP TABLE temp_parted_oncommit;
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+              relname              
+-----------------------------------
+ global_temp_parted_oncommit_test
+ global_temp_parted_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_parted_oncommit_test;
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+            relname             
+--------------------------------
+ global_temp_inh_oncommit_test
+ global_temp_inh_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ERROR:  cannot inherit from temporary relation "global_temp_table"
+ROLLBACK;
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM global_temp_table;
+ a 
+---
+ 1
+(1 row)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+(2 rows)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       1
+(1 row)
+
+\c
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+(0 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       2
+(1 row)
+
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       3
+(1 row)
+
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
+-- Test two phase commit
+CREATE TABLE global_temptest_persistent(col int);
+CREATE GLOBAL TEMP TABLE global_temptest(col int);
+INSERT INTO global_temptest VALUES (1);
+BEGIN;
+INSERT INTO global_temptest VALUES (2);
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+   2
+(2 rows)
+
+PREPARE TRANSACTION 'global_temp1';
+ERROR:  prepared transactions are disabled
+HINT:  Set max_prepared_transactions to a nonzero value.
+-- We can't see anything from an uncommitted transaction
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+(1 row)
+
+BEGIN;
+INSERT INTO global_temptest VALUES (3);
+INSERT INTO global_temptest_persistent SELECT * FROM global_temptest;
+PREPARE TRANSACTION 'global_temp2';
+ERROR:  prepared transactions are disabled
+HINT:  Set max_prepared_transactions to a nonzero value.
+COMMIT PREPARED 'global_temp1';
+ERROR:  prepared transaction with identifier "global_temp1" does not exist
+-- 1, 2
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+(1 row)
+
+-- Nothing
+SELECT * FROM global_temptest_persistent;
+ col 
+-----
+(0 rows)
+
+\c
+-- The temp table is empty now.
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+-- Still nothing in global_temptest_persistent table;
+SELECT * FROM global_temptest_persistent;
+ col 
+-----
+(0 rows)
+
+INSERT INTO global_temptest VALUES (4);
+COMMIT PREPARED 'global_temp2';
+ERROR:  prepared transaction with identifier "global_temp2" does not exist
+-- Only 4
+SELECT * FROM global_temptest;
+ col 
+-----
+   4
+(1 row)
+
+-- 1, 3
+SELECT * FROM global_temptest_persistent;
+ col 
+-----
+(0 rows)
+
+\c
+DROP TABLE global_temptest;
+DROP TABLE global_temptest_persistent;
diff --git a/src/test/regress/expected/session_table.out b/src/test/regress/expected/session_table.out
new file mode 100644
index 0000000..1b9b3f4
--- /dev/null
+++ b/src/test/regress/expected/session_table.out
@@ -0,0 +1,64 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+ count 
+-------
+ 10000
+(1 row)
+
+\c
+select count(*) from my_private_table;
+ count 
+-------
+     0
+(1 row)
+
+select * from my_private_table where x=10001;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select * from my_private_table where y=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select count(*) from my_private_table;
+ count  
+--------
+ 100000
+(1 row)
+
+\c
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+   x    |   y    
+--------+--------
+ 100000 | 100000
+(1 row)
+
+drop table  my_private_table;
diff --git a/src/test/regress/parallel_schedule b/src/test/regress/parallel_schedule
index fc0f141..507cf7d 100644
--- a/src/test/regress/parallel_schedule
+++ b/src/test/regress/parallel_schedule
@@ -107,7 +107,7 @@ test: json jsonb json_encoding jsonpath jsonpath_encoding jsonb_jsonpath
 # NB: temp.sql does a reconnect which transiently uses 2 connections,
 # so keep this parallel group to at most 19 tests
 # ----------
-test: plancache limit plpgsql copy2 temp domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
+test: plancache limit plpgsql copy2 temp global_temp session_table domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
 
 # ----------
 # Another group of parallel tests
diff --git a/src/test/regress/serial_schedule b/src/test/regress/serial_schedule
index 68ac56a..3890777 100644
--- a/src/test/regress/serial_schedule
+++ b/src/test/regress/serial_schedule
@@ -172,6 +172,8 @@ test: limit
 test: plpgsql
 test: copy2
 test: temp
+test: global_temp
+test: session_table
 test: domain
 test: rangefuncs
 test: prepare
diff --git a/src/test/regress/sql/global_temp.sql b/src/test/regress/sql/global_temp.sql
new file mode 100644
index 0000000..4d2da8d
--- /dev/null
+++ b/src/test/regress/sql/global_temp.sql
@@ -0,0 +1,191 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+
+-- Test ON COMMIT DELETE ROWS
+
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+SELECT * FROM global_temptest2;
+
+DROP TABLE global_temptest2;
+DROP TABLE global_temptest1;
+
+-- Unsupported ON COMMIT and foreign key combination
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+DROP TABLE temp_parted_oncommit;
+
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+DROP TABLE global_temp_parted_oncommit_test;
+
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ROLLBACK;
+
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+COMMIT;
+SELECT * FROM global_temp_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+COMMIT;
+SELECT * FROM normal_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+\c
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
+
+-- Test two phase commit
+CREATE TABLE global_temptest_persistent(col int);
+CREATE GLOBAL TEMP TABLE global_temptest(col int);
+INSERT INTO global_temptest VALUES (1);
+
+BEGIN;
+INSERT INTO global_temptest VALUES (2);
+SELECT * FROM global_temptest;
+PREPARE TRANSACTION 'global_temp1';
+-- We can't see anything from an uncommitted transaction
+SELECT * FROM global_temptest;
+
+BEGIN;
+INSERT INTO global_temptest VALUES (3);
+INSERT INTO global_temptest_persistent SELECT * FROM global_temptest;
+PREPARE TRANSACTION 'global_temp2';
+COMMIT PREPARED 'global_temp1';
+-- 1, 2
+SELECT * FROM global_temptest;
+-- Nothing
+SELECT * FROM global_temptest_persistent;
+\c
+-- The temp table is empty now.
+SELECT * FROM global_temptest;
+-- Still nothing in global_temptest_persistent table;
+SELECT * FROM global_temptest_persistent;
+INSERT INTO global_temptest VALUES (4);
+COMMIT PREPARED 'global_temp2';
+-- Only 4
+SELECT * FROM global_temptest;
+-- 1, 3
+SELECT * FROM global_temptest_persistent;
+\c
+DROP TABLE global_temptest;
+DROP TABLE global_temptest_persistent;
diff --git a/src/test/regress/sql/session_table.sql b/src/test/regress/sql/session_table.sql
new file mode 100644
index 0000000..c6663dc
--- /dev/null
+++ b/src/test/regress/sql/session_table.sql
@@ -0,0 +1,18 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+\c
+select count(*) from my_private_table;
+select * from my_private_table where x=10001;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+select * from my_private_table where y=10001;
+select count(*) from my_private_table;
+\c
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+drop table  my_private_table;

diff --git a/src/backend/access/brin/brin.c b/src/backend/access/brin/brin.c
index ae7b729..485c068 100644
--- a/src/backend/access/brin/brin.c
+++ b/src/backend/access/brin/brin.c
@@ -672,7 +672,7 @@ brinbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	/*
 	 * We expect to be called exactly once for any index relation.
 	 */
-	if (RelationGetNumberOfBlocks(index) != 0)
+	if (RelationGetNumberOfBlocks(index) != 0 && index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
 		elog(ERROR, "index \"%s\" already contains data",
 			 RelationGetRelationName(index));
 
@@ -681,9 +681,17 @@ brinbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	 * whole relation will be rolled back.
 	 */
 
-	meta = ReadBuffer(index, P_NEW);
-	Assert(BufferGetBlockNumber(meta) == BRIN_METAPAGE_BLKNO);
-	LockBuffer(meta, BUFFER_LOCK_EXCLUSIVE);
+	if (index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
+	{
+		meta = ReadBuffer(index, P_NEW);
+		Assert(BufferGetBlockNumber(meta) == BRIN_METAPAGE_BLKNO);
+		LockBuffer(meta, BUFFER_LOCK_EXCLUSIVE);
+	}
+	else
+	{
+		meta = ReadBuffer(index, BRIN_METAPAGE_BLKNO);
+		LockBuffer(meta, BUFFER_LOCK_SHARE);
+	}
 
 	brin_metapage_init(BufferGetPage(meta), BrinGetPagesPerRange(index),
 					   BRIN_CURRENT_VERSION);
diff --git a/src/backend/access/brin/brin_revmap.c b/src/backend/access/brin/brin_revmap.c
index 647350c..62e5212 100644
--- a/src/backend/access/brin/brin_revmap.c
+++ b/src/backend/access/brin/brin_revmap.c
@@ -25,6 +25,7 @@
 #include "access/brin_revmap.h"
 #include "access/brin_tuple.h"
 #include "access/brin_xlog.h"
+#include "access/brin.h"
 #include "access/rmgr.h"
 #include "access/xloginsert.h"
 #include "miscadmin.h"
@@ -79,6 +80,13 @@ brinRevmapInitialize(Relation idxrel, BlockNumber *pagesPerRange,
 	meta = ReadBuffer(idxrel, BRIN_METAPAGE_BLKNO);
 	LockBuffer(meta, BUFFER_LOCK_SHARE);
 	page = BufferGetPage(meta);
+
+	if (GlobalTempRelationPageIsNotInitialized(idxrel, page))
+	{
+		Relation heap = RelationIdGetRelation(idxrel->rd_index->indrelid);
+		brinbuild(heap, idxrel,  BuildIndexInfo(idxrel));
+		RelationClose(heap);
+	}
 	TestForOldSnapshot(snapshot, idxrel, page);
 	metadata = (BrinMetaPageData *) PageGetContents(page);
 
diff --git a/src/backend/access/gin/ginfast.c b/src/backend/access/gin/ginfast.c
index 439a91b..51fe102 100644
--- a/src/backend/access/gin/ginfast.c
+++ b/src/backend/access/gin/ginfast.c
@@ -241,6 +241,13 @@ ginHeapTupleFastInsert(GinState *ginstate, GinTupleCollector *collector)
 	metabuffer = ReadBuffer(index, GIN_METAPAGE_BLKNO);
 	metapage = BufferGetPage(metabuffer);
 
+	if (GlobalTempRelationPageIsNotInitialized(index, metapage))
+	{
+		Relation heap = RelationIdGetRelation(index->rd_index->indrelid);
+		ginbuild(heap, index, BuildIndexInfo(index));
+		RelationClose(heap);
+	}
+
 	/*
 	 * An insertion to the pending list could logically belong anywhere in the
 	 * tree, so it conflicts with all serializable scans.  All scans acquire a
diff --git a/src/backend/access/gin/ginget.c b/src/backend/access/gin/ginget.c
index b18ae2b..975c186 100644
--- a/src/backend/access/gin/ginget.c
+++ b/src/backend/access/gin/ginget.c
@@ -1759,7 +1759,8 @@ scanPendingInsert(IndexScanDesc scan, TIDBitmap *tbm, int64 *ntids)
 				match;
 	int			i;
 	pendingPosition pos;
-	Buffer		metabuffer = ReadBuffer(scan->indexRelation, GIN_METAPAGE_BLKNO);
+	Relation    index = scan->indexRelation;
+	Buffer		metabuffer = ReadBuffer(index, GIN_METAPAGE_BLKNO);
 	Page		page;
 	BlockNumber blkno;
 
@@ -1769,11 +1770,19 @@ scanPendingInsert(IndexScanDesc scan, TIDBitmap *tbm, int64 *ntids)
 	 * Acquire predicate lock on the metapage, to conflict with any fastupdate
 	 * insertions.
 	 */
-	PredicateLockPage(scan->indexRelation, GIN_METAPAGE_BLKNO, scan->xs_snapshot);
+	PredicateLockPage(index, GIN_METAPAGE_BLKNO, scan->xs_snapshot);
 
 	LockBuffer(metabuffer, GIN_SHARE);
 	page = BufferGetPage(metabuffer);
-	TestForOldSnapshot(scan->xs_snapshot, scan->indexRelation, page);
+	TestForOldSnapshot(scan->xs_snapshot, index, page);
+
+	if (GlobalTempRelationPageIsNotInitialized(index, page))
+	{
+		Relation heap = RelationIdGetRelation(index->rd_index->indrelid);
+		ginbuild(heap, index, BuildIndexInfo(index));
+		RelationClose(heap);
+		UnlockReleaseBuffer(metabuffer);
+	}
 	blkno = GinPageGetMeta(page)->head;
 
 	/*
@@ -1784,10 +1793,10 @@ scanPendingInsert(IndexScanDesc scan, TIDBitmap *tbm, int64 *ntids)
 	{
 		/* No pending list, so proceed with normal scan */
 		UnlockReleaseBuffer(metabuffer);
-		return;
+		return true;
 	}
 
-	pos.pendingBuffer = ReadBuffer(scan->indexRelation, blkno);
+	pos.pendingBuffer = ReadBuffer(index, blkno);
 	LockBuffer(pos.pendingBuffer, GIN_SHARE);
 	pos.firstOffset = FirstOffsetNumber;
 	UnlockReleaseBuffer(metabuffer);
diff --git a/src/backend/access/gin/gininsert.c b/src/backend/access/gin/gininsert.c
index 55eab14..d6739f3 100644
--- a/src/backend/access/gin/gininsert.c
+++ b/src/backend/access/gin/gininsert.c
@@ -328,7 +328,7 @@ ginbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	MemoryContext oldCtx;
 	OffsetNumber attnum;
 
-	if (RelationGetNumberOfBlocks(index) != 0)
+	if (RelationGetNumberOfBlocks(index) != 0 && index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
 		elog(ERROR, "index \"%s\" already contains data",
 			 RelationGetRelationName(index));
 
@@ -337,7 +337,15 @@ ginbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	memset(&buildstate.buildStats, 0, sizeof(GinStatsData));
 
 	/* initialize the meta page */
-	MetaBuffer = GinNewBuffer(index);
+	if (index->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
+	{
+		MetaBuffer = ReadBuffer(index, 0);
+		LockBuffer(MetaBuffer, GIN_SHARE);
+	}
+	else
+	{
+		MetaBuffer = GinNewBuffer(index);
+	}
 
 	/* initialize the root page */
 	RootBuffer = GinNewBuffer(index);
diff --git a/src/backend/access/gist/gist.c b/src/backend/access/gist/gist.c
index 0cc8791..bcde5ea 100644
--- a/src/backend/access/gist/gist.c
+++ b/src/backend/access/gist/gist.c
@@ -16,6 +16,7 @@
 
 #include "access/gist_private.h"
 #include "access/gistscan.h"
+#include "catalog/index.h"
 #include "catalog/pg_collation.h"
 #include "miscadmin.h"
 #include "storage/lmgr.h"
@@ -677,7 +678,10 @@ gistdoinsert(Relation r, IndexTuple itup, Size freespace,
 		if (!xlocked)
 		{
 			LockBuffer(stack->buffer, GIST_SHARE);
-			gistcheckpage(state.r, stack->buffer);
+			if (stack->blkno == GIST_ROOT_BLKNO && GlobalTempRelationPageIsNotInitialized(state.r, BufferGetPage(stack->buffer)))
+				gistbuild(heapRel, r, BuildIndexInfo(r));
+			else
+				gistcheckpage(state.r, stack->buffer);
 		}
 
 		stack->page = (Page) BufferGetPage(stack->buffer);
diff --git a/src/backend/access/gist/gistbuild.c b/src/backend/access/gist/gistbuild.c
index 2f4543d..8d194c8 100644
--- a/src/backend/access/gist/gistbuild.c
+++ b/src/backend/access/gist/gistbuild.c
@@ -156,7 +156,7 @@ gistbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	 * We expect to be called exactly once for any index relation. If that's
 	 * not the case, big trouble's what we have.
 	 */
-	if (RelationGetNumberOfBlocks(index) != 0)
+	if (RelationGetNumberOfBlocks(index) != 0 && index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
 		elog(ERROR, "index \"%s\" already contains data",
 			 RelationGetRelationName(index));
 
@@ -171,8 +171,16 @@ gistbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	buildstate.giststate->tempCxt = createTempGistContext();
 
 	/* initialize the root page */
-	buffer = gistNewBuffer(index);
-	Assert(BufferGetBlockNumber(buffer) == GIST_ROOT_BLKNO);
+	if (index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
+	{
+		buffer = gistNewBuffer(index);
+		Assert(BufferGetBlockNumber(buffer) == GIST_ROOT_BLKNO);
+	}
+	else
+	{
+		buffer = ReadBuffer(index, GIST_ROOT_BLKNO);
+		LockBuffer(buffer, GIST_SHARE);
+	}
 	page = BufferGetPage(buffer);
 
 	START_CRIT_SECTION();
diff --git a/src/backend/access/gist/gistget.c b/src/backend/access/gist/gistget.c
index 22d790d..5560a41 100644
--- a/src/backend/access/gist/gistget.c
+++ b/src/backend/access/gist/gistget.c
@@ -17,8 +17,10 @@
 #include "access/genam.h"
 #include "access/gist_private.h"
 #include "access/relscan.h"
+#include "catalog/index.h"
 #include "miscadmin.h"
 #include "storage/lmgr.h"
+#include "storage/freespace.h"
 #include "storage/predicate.h"
 #include "pgstat.h"
 #include "lib/pairingheap.h"
@@ -344,7 +346,10 @@ gistScanPage(IndexScanDesc scan, GISTSearchItem *pageItem,
 	buffer = ReadBuffer(scan->indexRelation, pageItem->blkno);
 	LockBuffer(buffer, GIST_SHARE);
 	PredicateLockPage(r, BufferGetBlockNumber(buffer), scan->xs_snapshot);
-	gistcheckpage(scan->indexRelation, buffer);
+	if (pageItem->blkno == GIST_ROOT_BLKNO && GlobalTempRelationPageIsNotInitialized(r, BufferGetPage(buffer)))
+		gistbuild(scan->heapRelation, r, BuildIndexInfo(r));
+	else
+		gistcheckpage(scan->indexRelation, buffer);
 	page = BufferGetPage(buffer);
 	TestForOldSnapshot(scan->xs_snapshot, r, page);
 	opaque = GistPageGetOpaque(page);
diff --git a/src/backend/access/gist/gistutil.c b/src/backend/access/gist/gistutil.c
index 45804d7..50b306a 100644
--- a/src/backend/access/gist/gistutil.c
+++ b/src/backend/access/gist/gistutil.c
@@ -1028,7 +1028,7 @@ gistGetFakeLSN(Relation rel)
 {
 	static XLogRecPtr counter = FirstNormalUnloggedLSN;
 
-	if (rel->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
+	if (RelationHasSessionScope(rel))
 	{
 		/*
 		 * Temporary relations are only accessible in our session, so a simple
diff --git a/src/backend/access/hash/hash.c b/src/backend/access/hash/hash.c
index 5cc30da..1b228db 100644
--- a/src/backend/access/hash/hash.c
+++ b/src/backend/access/hash/hash.c
@@ -119,7 +119,7 @@ hashbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	 * We expect to be called exactly once for any index relation. If that's
 	 * not the case, big trouble's what we have.
 	 */
-	if (RelationGetNumberOfBlocks(index) != 0)
+	if (RelationGetNumberOfBlocks(index) != 0 && index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
 		elog(ERROR, "index \"%s\" already contains data",
 			 RelationGetRelationName(index));
 
diff --git a/src/backend/access/hash/hashpage.c b/src/backend/access/hash/hashpage.c
index 838ee68..00ba123 100644
--- a/src/backend/access/hash/hashpage.c
+++ b/src/backend/access/hash/hashpage.c
@@ -75,13 +75,22 @@ _hash_getbuf(Relation rel, BlockNumber blkno, int access, int flags)
 
 	buf = ReadBuffer(rel, blkno);
 
-	if (access != HASH_NOLOCK)
-		LockBuffer(buf, access);
-
 	/* ref count and lock type are correct */
 
-	_hash_checkpage(rel, buf, flags);
-
+	if (blkno == HASH_METAPAGE && GlobalTempRelationPageIsNotInitialized(rel, BufferGetPage(buf)))
+	{
+		Relation heap = RelationIdGetRelation(rel->rd_index->indrelid);
+		hashbuild(heap, rel, BuildIndexInfo(rel));
+		RelationClose(heap);
+		if (access != HASH_NOLOCK)
+			LockBuffer(buf, access);
+	}
+	else
+	{
+		if (access != HASH_NOLOCK)
+			LockBuffer(buf, access);
+		_hash_checkpage(rel, buf, flags);
+	}
 	return buf;
 }
 
@@ -339,7 +348,7 @@ _hash_init(Relation rel, double num_tuples, ForkNumber forkNum)
 	bool		use_wal;
 
 	/* safety check */
-	if (RelationGetNumberOfBlocksInFork(rel, forkNum) != 0)
+	if (rel->rd_rel->relpersistence != RELPERSISTENCE_SESSION && RelationGetNumberOfBlocksInFork(rel, forkNum) != 0)
 		elog(ERROR, "cannot initialize non-empty hash index \"%s\"",
 			 RelationGetRelationName(rel));
 
diff --git a/src/backend/access/heap/heapam_handler.c b/src/backend/access/heap/heapam_handler.c
index 2dd8821..92df373 100644
--- a/src/backend/access/heap/heapam_handler.c
+++ b/src/backend/access/heap/heapam_handler.c
@@ -673,6 +673,7 @@ heapam_relation_copy_data(Relation rel, const RelFileNode *newrnode)
 			 * init fork of an unlogged relation.
 			 */
 			if (rel->rd_rel->relpersistence == RELPERSISTENCE_PERMANENT ||
+				rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ||
 				(rel->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED &&
 				 forkNum == INIT_FORKNUM))
 				log_smgrcreate(newrnode, forkNum);
diff --git a/src/backend/access/nbtree/nbtpage.c b/src/backend/access/nbtree/nbtpage.c
index 268f869..eff9e10 100644
--- a/src/backend/access/nbtree/nbtpage.c
+++ b/src/backend/access/nbtree/nbtpage.c
@@ -27,8 +27,10 @@
 #include "access/transam.h"
 #include "access/xlog.h"
 #include "access/xloginsert.h"
+#include "catalog/index.h"
 #include "miscadmin.h"
 #include "storage/indexfsm.h"
+#include "storage/buf_internals.h"
 #include "storage/lmgr.h"
 #include "storage/predicate.h"
 #include "utils/snapmgr.h"
@@ -762,8 +764,22 @@ _bt_getbuf(Relation rel, BlockNumber blkno, int access)
 	{
 		/* Read an existing block of the relation */
 		buf = ReadBuffer(rel, blkno);
-		LockBuffer(buf, access);
-		_bt_checkpage(rel, buf);
+		/* Session temporary relation may be not yet initialized for this backend. */
+		if (blkno == BTREE_METAPAGE && GlobalTempRelationPageIsNotInitialized(rel, BufferGetPage(buf)))
+		{
+			Relation heap = RelationIdGetRelation(rel->rd_index->indrelid);
+			ReleaseBuffer(buf);
+			DropRelFileNodeLocalBuffers(rel->rd_node, MAIN_FORKNUM, blkno);
+			btbuild(heap, rel, BuildIndexInfo(rel));
+			RelationClose(heap);
+			buf = ReadBuffer(rel, blkno);
+			LockBuffer(buf, access);
+		}
+		else
+		{
+			LockBuffer(buf, access);
+			_bt_checkpage(rel, buf);
+		}
 	}
 	else
 	{
diff --git a/src/backend/access/nbtree/nbtsort.c b/src/backend/access/nbtree/nbtsort.c
index ab19692..227bc19 100644
--- a/src/backend/access/nbtree/nbtsort.c
+++ b/src/backend/access/nbtree/nbtsort.c
@@ -330,7 +330,7 @@ btbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	 * We expect to be called exactly once for any index relation. If that's
 	 * not the case, big trouble's what we have.
 	 */
-	if (RelationGetNumberOfBlocks(index) != 0)
+	if (RelationGetNumberOfBlocks(index) != 0 && index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
 		elog(ERROR, "index \"%s\" already contains data",
 			 RelationGetRelationName(index));
 
diff --git a/src/backend/access/spgist/spginsert.c b/src/backend/access/spgist/spginsert.c
index b40bd44..f44bec7 100644
--- a/src/backend/access/spgist/spginsert.c
+++ b/src/backend/access/spgist/spginsert.c
@@ -81,21 +81,32 @@ spgbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 				rootbuffer,
 				nullbuffer;
 
-	if (RelationGetNumberOfBlocks(index) != 0)
-		elog(ERROR, "index \"%s\" already contains data",
-			 RelationGetRelationName(index));
-
-	/*
-	 * Initialize the meta page and root pages
-	 */
-	metabuffer = SpGistNewBuffer(index);
-	rootbuffer = SpGistNewBuffer(index);
-	nullbuffer = SpGistNewBuffer(index);
-
-	Assert(BufferGetBlockNumber(metabuffer) == SPGIST_METAPAGE_BLKNO);
-	Assert(BufferGetBlockNumber(rootbuffer) == SPGIST_ROOT_BLKNO);
-	Assert(BufferGetBlockNumber(nullbuffer) == SPGIST_NULL_BLKNO);
-
+	if (index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
+	{
+		if (RelationGetNumberOfBlocks(index) != 0)
+			elog(ERROR, "index \"%s\" already contains data",
+				 RelationGetRelationName(index));
+
+		/*
+		 * Initialize the meta page and root pages
+		 */
+		metabuffer = SpGistNewBuffer(index);
+		rootbuffer = SpGistNewBuffer(index);
+		nullbuffer = SpGistNewBuffer(index);
+
+		Assert(BufferGetBlockNumber(metabuffer) == SPGIST_METAPAGE_BLKNO);
+		Assert(BufferGetBlockNumber(rootbuffer) == SPGIST_ROOT_BLKNO);
+		Assert(BufferGetBlockNumber(nullbuffer) == SPGIST_NULL_BLKNO);
+	}
+	else
+	{
+		metabuffer = ReadBuffer(index, SPGIST_METAPAGE_BLKNO);
+		rootbuffer = ReadBuffer(index, SPGIST_ROOT_BLKNO);
+		nullbuffer = ReadBuffer(index, SPGIST_NULL_BLKNO);
+		LockBuffer(metabuffer, BUFFER_LOCK_SHARE);
+		LockBuffer(rootbuffer, BUFFER_LOCK_SHARE);
+		LockBuffer(nullbuffer, BUFFER_LOCK_SHARE);
+	}
 	START_CRIT_SECTION();
 
 	SpGistInitMetapage(BufferGetPage(metabuffer));
diff --git a/src/backend/access/spgist/spgutils.c b/src/backend/access/spgist/spgutils.c
index 45472db..ea15964 100644
--- a/src/backend/access/spgist/spgutils.c
+++ b/src/backend/access/spgist/spgutils.c
@@ -21,6 +21,7 @@
 #include "access/spgist_private.h"
 #include "access/transam.h"
 #include "access/xact.h"
+#include "catalog/index.h"
 #include "catalog/pg_amop.h"
 #include "storage/bufmgr.h"
 #include "storage/indexfsm.h"
@@ -106,6 +107,7 @@ spgGetCache(Relation index)
 		spgConfigIn in;
 		FmgrInfo   *procinfo;
 		Buffer		metabuffer;
+		Page        metapage;
 		SpGistMetaPageData *metadata;
 
 		cache = MemoryContextAllocZero(index->rd_indexcxt,
@@ -155,12 +157,21 @@ spgGetCache(Relation index)
 		metabuffer = ReadBuffer(index, SPGIST_METAPAGE_BLKNO);
 		LockBuffer(metabuffer, BUFFER_LOCK_SHARE);
 
-		metadata = SpGistPageGetMeta(BufferGetPage(metabuffer));
+		metapage = BufferGetPage(metabuffer);
+		metadata = SpGistPageGetMeta(metapage);
 
 		if (metadata->magicNumber != SPGIST_MAGIC_NUMBER)
-			elog(ERROR, "index \"%s\" is not an SP-GiST index",
-				 RelationGetRelationName(index));
-
+		{
+			if (GlobalTempRelationPageIsNotInitialized(index, metapage))
+			{
+				Relation heap = RelationIdGetRelation(index->rd_index->indrelid);
+				spgbuild(heap, index, BuildIndexInfo(index));
+				RelationClose(heap);
+			}
+			else
+				elog(ERROR, "index \"%s\" is not an SP-GiST index",
+					 RelationGetRelationName(index));
+		}
 		cache->lastUsedPages = metadata->lastUsedPages;
 
 		UnlockReleaseBuffer(metabuffer);
diff --git a/src/backend/catalog/catalog.c b/src/backend/catalog/catalog.c
index 1af31c2..e60bdb7 100644
--- a/src/backend/catalog/catalog.c
+++ b/src/backend/catalog/catalog.c
@@ -402,6 +402,9 @@ GetNewRelFileNode(Oid reltablespace, Relation pg_class, char relpersistence)
 		case RELPERSISTENCE_TEMP:
 			backend = BackendIdForTempRelations();
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index f6c31cc..d943b57 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3652,7 +3652,7 @@ reindex_relation(Oid relid, int flags, int options)
 		if (flags & REINDEX_REL_FORCE_INDEXES_UNLOGGED)
 			persistence = RELPERSISTENCE_UNLOGGED;
 		else if (flags & REINDEX_REL_FORCE_INDEXES_PERMANENT)
-			persistence = RELPERSISTENCE_PERMANENT;
+			persistence = rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ? RELPERSISTENCE_SESSION : RELPERSISTENCE_PERMANENT;
 		else
 			persistence = rel->rd_rel->relpersistence;
 
diff --git a/src/backend/catalog/storage.c b/src/backend/catalog/storage.c
index 625af8d..1e192fa 100644
--- a/src/backend/catalog/storage.c
+++ b/src/backend/catalog/storage.c
@@ -93,6 +93,10 @@ RelationCreateStorage(RelFileNode rnode, char relpersistence)
 			backend = InvalidBackendId;
 			needs_wal = false;
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			needs_wal = false;
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
 			needs_wal = true;
diff --git a/src/backend/commands/analyze.c b/src/backend/commands/analyze.c
index 7accb95..9f2ea48 100644
--- a/src/backend/commands/analyze.c
+++ b/src/backend/commands/analyze.c
@@ -102,7 +102,7 @@ static int	acquire_inherited_sample_rows(Relation onerel, int elevel,
 										  HeapTuple *rows, int targrows,
 										  double *totalrows, double *totaldeadrows);
 static void update_attstats(Oid relid, bool inh,
-							int natts, VacAttrStats **vacattrstats);
+							int natts, VacAttrStats **vacattrstats, bool is_global_temp);
 static Datum std_fetch_func(VacAttrStatsP stats, int rownum, bool *isNull);
 static Datum ind_fetch_func(VacAttrStatsP stats, int rownum, bool *isNull);
 
@@ -318,6 +318,7 @@ do_analyze_rel(Relation onerel, VacuumParams *params,
 	Oid			save_userid;
 	int			save_sec_context;
 	int			save_nestlevel;
+	bool        is_global_temp = onerel->rd_rel->relpersistence == RELPERSISTENCE_SESSION;
 
 	if (inh)
 		ereport(elevel,
@@ -575,14 +576,14 @@ do_analyze_rel(Relation onerel, VacuumParams *params,
 		 * pg_statistic for columns we didn't process, we leave them alone.)
 		 */
 		update_attstats(RelationGetRelid(onerel), inh,
-						attr_cnt, vacattrstats);
+						attr_cnt, vacattrstats, is_global_temp);
 
 		for (ind = 0; ind < nindexes; ind++)
 		{
 			AnlIndexData *thisdata = &indexdata[ind];
 
 			update_attstats(RelationGetRelid(Irel[ind]), false,
-							thisdata->attr_cnt, thisdata->vacattrstats);
+							thisdata->attr_cnt, thisdata->vacattrstats, is_global_temp);
 		}
 
 		/*
@@ -1425,7 +1426,7 @@ acquire_inherited_sample_rows(Relation onerel, int elevel,
  *		by taking a self-exclusive lock on the relation in analyze_rel().
  */
 static void
-update_attstats(Oid relid, bool inh, int natts, VacAttrStats **vacattrstats)
+update_attstats(Oid relid, bool inh, int natts, VacAttrStats **vacattrstats, bool is_global_temp)
 {
 	Relation	sd;
 	int			attno;
@@ -1527,30 +1528,42 @@ update_attstats(Oid relid, bool inh, int natts, VacAttrStats **vacattrstats)
 			}
 		}
 
-		/* Is there already a pg_statistic tuple for this attribute? */
-		oldtup = SearchSysCache3(STATRELATTINH,
-								 ObjectIdGetDatum(relid),
-								 Int16GetDatum(stats->attr->attnum),
-								 BoolGetDatum(inh));
-
-		if (HeapTupleIsValid(oldtup))
+		if (is_global_temp)
 		{
-			/* Yes, replace it */
-			stup = heap_modify_tuple(oldtup,
-									 RelationGetDescr(sd),
-									 values,
-									 nulls,
-									 replaces);
-			ReleaseSysCache(oldtup);
-			CatalogTupleUpdate(sd, &stup->t_self, stup);
+			stup = heap_form_tuple(RelationGetDescr(sd), values, nulls);
+			InsertSysCache(STATRELATTINH,
+						   ObjectIdGetDatum(relid),
+						   Int16GetDatum(stats->attr->attnum),
+						   BoolGetDatum(inh),
+						   0,
+						   stup);
 		}
 		else
 		{
-			/* No, insert new tuple */
-			stup = heap_form_tuple(RelationGetDescr(sd), values, nulls);
-			CatalogTupleInsert(sd, stup);
-		}
+			/* Is there already a pg_statistic tuple for this attribute? */
+			oldtup = SearchSysCache3(STATRELATTINH,
+									 ObjectIdGetDatum(relid),
+									 Int16GetDatum(stats->attr->attnum),
+									 BoolGetDatum(inh));
 
+			if (HeapTupleIsValid(oldtup))
+			{
+				/* Yes, replace it */
+				stup = heap_modify_tuple(oldtup,
+										 RelationGetDescr(sd),
+										 values,
+										 nulls,
+										 replaces);
+				ReleaseSysCache(oldtup);
+				CatalogTupleUpdate(sd, &stup->t_self, stup);
+			}
+			else
+			{
+				/* No, insert new tuple */
+				stup = heap_form_tuple(RelationGetDescr(sd), values, nulls);
+				CatalogTupleInsert(sd, stup);
+			}
+		}
 		heap_freetuple(stup);
 	}
 
diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index a23128d..5d131a7 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -1400,7 +1400,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap,
 	 */
 	if (newrelpersistence == RELPERSISTENCE_UNLOGGED)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_UNLOGGED;
-	else if (newrelpersistence == RELPERSISTENCE_PERMANENT)
+	else if (newrelpersistence != RELPERSISTENCE_TEMP)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_PERMANENT;
 
 	/* Report that we are now reindexing relations */
diff --git a/src/backend/commands/sequence.c b/src/backend/commands/sequence.c
index a13322b..be661a4 100644
--- a/src/backend/commands/sequence.c
+++ b/src/backend/commands/sequence.c
@@ -94,7 +94,7 @@ static HTAB *seqhashtab = NULL; /* hash table for SeqTable items */
  */
 static SeqTableData *last_used_seq = NULL;
 
-static void fill_seq_with_data(Relation rel, HeapTuple tuple);
+static void fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf);
 static Relation lock_and_open_sequence(SeqTable seq);
 static void create_seq_hashtable(void);
 static void init_sequence(Oid relid, SeqTable *p_elm, Relation *p_rel);
@@ -222,7 +222,7 @@ DefineSequence(ParseState *pstate, CreateSeqStmt *seq)
 
 	/* now initialize the sequence's data */
 	tuple = heap_form_tuple(tupDesc, value, null);
-	fill_seq_with_data(rel, tuple);
+	fill_seq_with_data(rel, tuple, InvalidBuffer);
 
 	/* process OWNED BY if given */
 	if (owned_by)
@@ -327,7 +327,7 @@ ResetSequence(Oid seq_relid)
 	/*
 	 * Insert the modified tuple into the new storage file.
 	 */
-	fill_seq_with_data(seq_rel, tuple);
+	fill_seq_with_data(seq_rel, tuple, InvalidBuffer);
 
 	/* Clear local cache so that we don't think we have cached numbers */
 	/* Note that we do not change the currval() state */
@@ -340,18 +340,21 @@ ResetSequence(Oid seq_relid)
  * Initialize a sequence's relation with the specified tuple as content
  */
 static void
-fill_seq_with_data(Relation rel, HeapTuple tuple)
+fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf)
 {
-	Buffer		buf;
 	Page		page;
 	sequence_magic *sm;
 	OffsetNumber offnum;
+	bool lockBuffer = false;
 
 	/* Initialize first page of relation with special magic number */
 
-	buf = ReadBuffer(rel, P_NEW);
-	Assert(BufferGetBlockNumber(buf) == 0);
-
+	if (buf == InvalidBuffer)
+	{
+		buf = ReadBuffer(rel, P_NEW);
+		Assert(BufferGetBlockNumber(buf) == 0);
+		lockBuffer = true;
+	}
 	page = BufferGetPage(buf);
 
 	PageInit(page, BufferGetPageSize(buf), sizeof(sequence_magic));
@@ -360,7 +363,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	/* Now insert sequence tuple */
 
-	LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
+	if (lockBuffer)
+		LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
 
 	/*
 	 * Since VACUUM does not process sequences, we have to force the tuple to
@@ -410,7 +414,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	END_CRIT_SECTION();
 
-	UnlockReleaseBuffer(buf);
+	if (lockBuffer)
+		UnlockReleaseBuffer(buf);
 }
 
 /*
@@ -502,7 +507,7 @@ AlterSequence(ParseState *pstate, AlterSeqStmt *stmt)
 		/*
 		 * Insert the modified tuple into the new storage file.
 		 */
-		fill_seq_with_data(seqrel, newdatatuple);
+		fill_seq_with_data(seqrel, newdatatuple, InvalidBuffer);
 	}
 
 	/* process OWNED BY if given */
@@ -1178,6 +1183,17 @@ read_seq_tuple(Relation rel, Buffer *buf, HeapTuple seqdatatuple)
 	LockBuffer(*buf, BUFFER_LOCK_EXCLUSIVE);
 
 	page = BufferGetPage(*buf);
+	if (GlobalTempRelationPageIsNotInitialized(rel, page))
+	{
+		/* Initialize sequence for global temporary tables */
+		Datum		value[SEQ_COL_LASTCOL] = {0};
+		bool		null[SEQ_COL_LASTCOL] = {false};
+		HeapTuple tuple;
+		value[SEQ_COL_LASTVAL-1] = Int64GetDatumFast(1); /* start sequence with 1 */
+		tuple = heap_form_tuple(RelationGetDescr(rel), value, null);
+		fill_seq_with_data(rel, tuple, *buf);
+	}
+
 	sm = (sequence_magic *) PageGetSpecialPointer(page);
 
 	if (sm->magic != SEQ_MAGIC)
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 8d25d14..50d0402 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -587,7 +587,7 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 	 * Check consistency of arguments
 	 */
 	if (stmt->oncommit != ONCOMMIT_NOOP
-		&& stmt->relation->relpersistence != RELPERSISTENCE_TEMP)
+		&& !IsLocalRelpersistence(stmt->relation->relpersistence))
 		ereport(ERROR,
 				(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 				 errmsg("ON COMMIT can only be used on temporary tables")));
@@ -1772,7 +1772,8 @@ ExecuteTruncateGuts(List *explicit_rels, List *relids, List *relids_logged,
 		 * table or the current physical file to be thrown away anyway.
 		 */
 		if (rel->rd_createSubid == mySubid ||
-			rel->rd_newRelfilenodeSubid == mySubid)
+			rel->rd_newRelfilenodeSubid == mySubid ||
+			rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
 		{
 			/* Immediate, non-rollbackable truncation is OK */
 			heap_truncate_one_rel(rel);
@@ -7708,6 +7709,12 @@ ATAddForeignKeyConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
 						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 						 errmsg("constraints on unlogged tables may reference only permanent or unlogged tables")));
 			break;
+		case RELPERSISTENCE_SESSION:
+			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
+				ereport(ERROR,
+						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+						 errmsg("constraints on session tables may reference only session tables")));
+			break;
 		case RELPERSISTENCE_TEMP:
 			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_TEMP)
 				ereport(ERROR,
@@ -14140,6 +14147,13 @@ ATPrepChangePersistence(Relation rel, bool toLogged)
 							RelationGetRelationName(rel)),
 					 errtable(rel)));
 			break;
+		case RELPERSISTENCE_SESSION:
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+					 errmsg("cannot change logged status of session table \"%s\"",
+							RelationGetRelationName(rel)),
+					 errtable(rel)));
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			if (toLogged)
 				/* nothing to do */
@@ -14627,14 +14641,7 @@ PreCommit_on_commit_actions(void)
 				/* Do nothing (there shouldn't be such entries, actually) */
 				break;
 			case ONCOMMIT_DELETE_ROWS:
-
-				/*
-				 * If this transaction hasn't accessed any temporary
-				 * relations, we can skip truncating ON COMMIT DELETE ROWS
-				 * tables, as they must still be empty.
-				 */
-				if ((MyXactFlags & XACT_FLAGS_ACCESSEDTEMPNAMESPACE))
-					oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
+				oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
 				break;
 			case ONCOMMIT_DROP:
 				oids_to_drop = lappend_oid(oids_to_drop, oc->relid);
diff --git a/src/backend/optimizer/path/allpaths.c b/src/backend/optimizer/path/allpaths.c
index db3a68a..60212b0 100644
--- a/src/backend/optimizer/path/allpaths.c
+++ b/src/backend/optimizer/path/allpaths.c
@@ -48,6 +48,7 @@
 #include "partitioning/partprune.h"
 #include "rewrite/rewriteManip.h"
 #include "utils/lsyscache.h"
+#include "utils/rel.h"
 
 
 /* results of subquery_is_pushdown_safe */
@@ -618,7 +619,7 @@ set_rel_consider_parallel(PlannerInfo *root, RelOptInfo *rel,
 			 * the rest of the necessary infrastructure right now anyway.  So
 			 * for now, bail out if we see a temporary table.
 			 */
-			if (get_rel_persistence(rte->relid) == RELPERSISTENCE_TEMP)
+			if (IsLocalRelpersistence(get_rel_persistence(rte->relid)))
 				return;
 
 			/*
diff --git a/src/backend/optimizer/plan/planner.c b/src/backend/optimizer/plan/planner.c
index 17c5f08..7c83e7b 100644
--- a/src/backend/optimizer/plan/planner.c
+++ b/src/backend/optimizer/plan/planner.c
@@ -6307,7 +6307,7 @@ plan_create_index_workers(Oid tableOid, Oid indexOid)
 	 * Furthermore, any index predicate or index expressions must be parallel
 	 * safe.
 	 */
-	if (heap->rd_rel->relpersistence == RELPERSISTENCE_TEMP ||
+	if (RelationHasSessionScope(heap) ||
 		!is_parallel_safe(root, (Node *) RelationGetIndexExpressions(index)) ||
 		!is_parallel_safe(root, (Node *) RelationGetIndexPredicate(index)))
 	{
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index 3f67aaf..565c868 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -3266,20 +3266,11 @@ OptTemp:	TEMPORARY					{ $$ = RELPERSISTENCE_TEMP; }
 			| TEMP						{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMPORARY			{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMP				{ $$ = RELPERSISTENCE_TEMP; }
-			| GLOBAL TEMPORARY
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
-			| GLOBAL TEMP
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
+			| GLOBAL TEMPORARY          { $$ = RELPERSISTENCE_SESSION; }
+			| GLOBAL TEMP               { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION                   { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMPORARY         { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMP              { $$ = RELPERSISTENCE_SESSION; }
 			| UNLOGGED					{ $$ = RELPERSISTENCE_UNLOGGED; }
 			| /*EMPTY*/					{ $$ = RELPERSISTENCE_PERMANENT; }
 		;
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index ee47547..ea7fe4c 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -437,6 +437,14 @@ generateSerialExtraStmts(CreateStmtContext *cxt, ColumnDef *column,
 	seqstmt->options = seqoptions;
 
 	/*
+	 * Why we should not always use persistence of parent table?
+	 * Although it is prohibited to have unlogged sequences,
+	 * unlogged tables with SERIAL fields are accepted!
+	 */
+	if (cxt->relation->relpersistence != RELPERSISTENCE_UNLOGGED)
+		seqstmt->sequence->relpersistence = cxt->relation->relpersistence;
+
+	/*
 	 * If a sequence data type was specified, add it to the options.  Prepend
 	 * to the list rather than append; in case a user supplied their own AS
 	 * clause, the "redundant options" error will point to their occurrence,
diff --git a/src/backend/postmaster/autovacuum.c b/src/backend/postmaster/autovacuum.c
index c1dd816..dcfc134 100644
--- a/src/backend/postmaster/autovacuum.c
+++ b/src/backend/postmaster/autovacuum.c
@@ -2157,7 +2157,7 @@ do_autovacuum(void)
 		/*
 		 * We cannot safely process other backends' temp tables, so skip 'em.
 		 */
-		if (classForm->relpersistence == RELPERSISTENCE_TEMP)
+		if (IsLocalRelpersistence(classForm->relpersistence))
 			continue;
 
 		relid = classForm->oid;
diff --git a/src/backend/storage/smgr/md.c b/src/backend/storage/smgr/md.c
index 07f3c93..5db79ec 100644
--- a/src/backend/storage/smgr/md.c
+++ b/src/backend/storage/smgr/md.c
@@ -33,6 +33,7 @@
 #include "postmaster/bgwriter.h"
 #include "storage/fd.h"
 #include "storage/bufmgr.h"
+#include "storage/ipc.h"
 #include "storage/md.h"
 #include "storage/relfilenode.h"
 #include "storage/smgr.h"
@@ -87,6 +88,18 @@ typedef struct _MdfdVec
 
 static MemoryContext MdCxt;		/* context for all MdfdVec objects */
 
+/*
+ * Structure used to collect information created by this backend.
+ * Data of this related should be deleted on backend exit.
+ */
+typedef struct SessionRelation
+{
+	RelFileNodeBackend rnode;
+	struct SessionRelation* next;
+} SessionRelation;
+
+
+static SessionRelation* SessionRelations;
 
 /* Populate a file tag describing an md.c segment file. */
 #define INIT_MD_FILETAG(a,xx_rnode,xx_forknum,xx_segno) \
@@ -152,6 +165,45 @@ mdinit(void)
 								  ALLOCSET_DEFAULT_SIZES);
 }
 
+
+/*
+ * Delete all data of session relations and remove their pages from shared buffers.
+ * This function is called on backend exit.
+ */
+static void
+TruncateSessionRelations(int code, Datum arg)
+{
+	SessionRelation* rel;
+	for (rel = SessionRelations; rel != NULL; rel = rel->next)
+	{
+		/* Delete relation files */
+		mdunlink(rel->rnode, InvalidForkNumber, false);
+	}
+}
+
+/*
+ * Maintain information about session relations accessed by this backend.
+ * This list is needed to perform cleanup on backend exit.
+ * Session relation is linked in this list when this relation is created or opened and file doesn't exist.
+ * Such procedure guarantee that each relation is linked into list only once.
+ */
+static void
+RegisterSessionRelation(SMgrRelation reln)
+{
+	SessionRelation* rel = (SessionRelation*)MemoryContextAlloc(TopMemoryContext, sizeof(SessionRelation));
+
+	/*
+	 * Perform session relation cleanup on backend exit. We are using shared memory hook, because
+	 * cleanup should be performed before backend is disconnected from shared memory.
+	 */
+	if (SessionRelations == NULL)
+		on_shmem_exit(TruncateSessionRelations, 0);
+
+	rel->rnode = reln->smgr_rnode;
+	rel->next = SessionRelations;
+	SessionRelations = rel;
+}
+
 /*
  *	mdexists() -- Does the physical file exist?
  *
@@ -218,6 +270,8 @@ mdcreate(SMgrRelation reln, ForkNumber forkNum, bool isRedo)
 					 errmsg("could not create file \"%s\": %m", path)));
 		}
 	}
+	if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		RegisterSessionRelation(reln);
 
 	pfree(path);
 
@@ -465,6 +519,19 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 
 	if (fd < 0)
 	{
+		/*
+		 * In case of session relation access, there may be no yet files of this relation for this backend.
+		 * If so, then create file and register session relation for truncation on backend exit.
+		 */
+		if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
+			fd = PathNameOpenFile(path, O_RDWR | PG_BINARY | O_CREAT);
+			if (fd >= 0)
+			{
+				RegisterSessionRelation(reln);
+				goto NewSegment;
+			}
+		}
 		if ((behavior & EXTENSION_RETURN_NULL) &&
 			FILE_POSSIBLY_DELETED(errno))
 		{
@@ -476,6 +543,7 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 				 errmsg("could not open file \"%s\": %m", path)));
 	}
 
+  NewSegment:
 	pfree(path);
 
 	_fdvec_resize(reln, forknum, 1);
@@ -652,8 +720,13 @@ mdread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
 		 * complaining.  This allows, for example, the case of trying to
 		 * update a block that was later truncated away.
 		 */
-		if (zero_damaged_pages || InRecovery)
+		if (zero_damaged_pages || InRecovery || RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
 			MemSet(buffer, 0, BLCKSZ);
+			/* In case of session relation we need to write zero page to provide correct result of subsequent mdnblocks */
+			if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+				mdwrite(reln, forknum, blocknum, buffer, true);
+		}
 		else
 			ereport(ERROR,
 					(errcode(ERRCODE_DATA_CORRUPTED),
@@ -738,12 +811,18 @@ mdwrite(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
 BlockNumber
 mdnblocks(SMgrRelation reln, ForkNumber forknum)
 {
-	MdfdVec    *v = mdopenfork(reln, forknum, EXTENSION_FAIL);
+	/*
+	 * If we access session relation, there may be no files yet of this relation for this backend.
+	 * Pass EXTENSION_RETURN_NULL to make mdopen return NULL in this case instead of reporting error.
+	 */
+	MdfdVec    *v = mdopenfork(reln, forknum, RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode)
+							   ? EXTENSION_RETURN_NULL : EXTENSION_FAIL);
 	BlockNumber nblocks;
 	BlockNumber segno = 0;
 
 	/* mdopen has opened the first segment */
-	Assert(reln->md_num_open_segs[forknum] > 0);
+	if (reln->md_num_open_segs[forknum] == 0)
+		return 0;
 
 	/*
 	 * Start from the last open segments, to avoid redundant seeks.  We have
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index a87e721..2401361 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -994,6 +994,9 @@ pg_relation_filepath(PG_FUNCTION_ARGS)
 	/* Determine owning backend. */
 	switch (relform->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/utils/cache/catcache.c b/src/backend/utils/cache/catcache.c
index c3e7d94..6d86c28 100644
--- a/src/backend/utils/cache/catcache.c
+++ b/src/backend/utils/cache/catcache.c
@@ -1191,6 +1191,111 @@ SearchCatCache4(CatCache *cache,
 	return SearchCatCacheInternal(cache, 4, v1, v2, v3, v4);
 }
 
+
+void InsertCatCache(CatCache *cache,
+					Datum v1, Datum v2, Datum v3, Datum v4,
+					HeapTuple tuple)
+{
+	Datum		arguments[CATCACHE_MAXKEYS];
+	uint32		hashValue;
+	Index		hashIndex;
+	CatCTup    *ct;
+	dlist_iter	iter;
+	dlist_head *bucket;
+	int         nkeys = cache->cc_nkeys;
+	MemoryContext oldcxt;
+	int         i;
+
+	/*
+	 * one-time startup overhead for each cache
+	 */
+	if (unlikely(cache->cc_tupdesc == NULL))
+		CatalogCacheInitializeCache(cache);
+
+	/* Initialize local parameter array */
+	arguments[0] = v1;
+	arguments[1] = v2;
+	arguments[2] = v3;
+	arguments[3] = v4;
+	/*
+	 * find the hash bucket in which to look for the tuple
+	 */
+	hashValue = CatalogCacheComputeHashValue(cache, nkeys, v1, v2, v3, v4);
+	hashIndex = HASH_INDEX(hashValue, cache->cc_nbuckets);
+
+	/*
+	 * scan the hash bucket until we find a match or exhaust our tuples
+	 *
+	 * Note: it's okay to use dlist_foreach here, even though we modify the
+	 * dlist within the loop, because we don't continue the loop afterwards.
+	 */
+	bucket = &cache->cc_bucket[hashIndex];
+	dlist_foreach(iter, bucket)
+	{
+		ct = dlist_container(CatCTup, cache_elem, iter.cur);
+
+		if (ct->dead)
+			continue;			/* ignore dead entries */
+
+		if (ct->hash_value != hashValue)
+			continue;			/* quickly skip entry if wrong hash val */
+
+		if (!CatalogCacheCompareTuple(cache, nkeys, ct->keys, arguments))
+			continue;
+
+		/*
+		 * If it's a positive entry, bump its refcount and return it. If it's
+		 * negative, we can report failure to the caller.
+		 */
+		if (ct->tuple.t_len == tuple->t_len)
+		{
+			memcpy((char *) ct->tuple.t_data,
+				   (const char *) tuple->t_data,
+				   tuple->t_len);
+			return;
+		}
+		dlist_delete(&ct->cache_elem);
+		pfree(ct);
+		cache->cc_ntup -= 1;
+		CacheHdr->ch_ntup -= 1;
+		break;
+	}
+	/* Allocate memory for CatCTup and the cached tuple in one go */
+	oldcxt = MemoryContextSwitchTo(CacheMemoryContext);
+
+	ct = (CatCTup *) palloc(sizeof(CatCTup) +
+							MAXIMUM_ALIGNOF + tuple->t_len);
+	ct->tuple.t_len = tuple->t_len;
+	ct->tuple.t_self = tuple->t_self;
+	ct->tuple.t_tableOid = tuple->t_tableOid;
+	ct->tuple.t_data = (HeapTupleHeader)
+		MAXALIGN(((char *) ct) + sizeof(CatCTup));
+	/* copy tuple contents */
+	memcpy((char *) ct->tuple.t_data,
+		   (const char *) tuple->t_data,
+		   tuple->t_len);
+	ct->ct_magic = CT_MAGIC;
+	ct->my_cache = cache;
+	ct->c_list = NULL;
+	ct->refcount = 1;			/* pinned*/
+	ct->dead = false;
+	ct->negative = false;
+	ct->hash_value = hashValue;
+	dlist_push_head(&cache->cc_bucket[hashIndex], &ct->cache_elem);
+	memcpy(ct->keys, arguments, nkeys*sizeof(Datum));
+
+	cache->cc_ntup++;
+	CacheHdr->ch_ntup++;
+	MemoryContextSwitchTo(oldcxt);
+
+	/*
+	 * If the hash table has become too full, enlarge the buckets array. Quite
+	 * arbitrarily, we enlarge when fill factor > 2.
+	 */
+	if (cache->cc_ntup > cache->cc_nbuckets * 2)
+		RehashCatCache(cache);
+}
+
 /*
  * Work-horse for SearchCatCache/SearchCatCacheN.
  */
diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c
index 585dcee..ce8852c 100644
--- a/src/backend/utils/cache/relcache.c
+++ b/src/backend/utils/cache/relcache.c
@@ -1098,6 +1098,10 @@ RelationBuildDesc(Oid targetRelId, bool insertIt)
 	relation->rd_newRelfilenodeSubid = InvalidSubTransactionId;
 	switch (relation->rd_rel->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			relation->rd_backend = BackendIdForSessionRelations();
+			relation->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			relation->rd_backend = InvalidBackendId;
@@ -3301,6 +3305,10 @@ RelationBuildLocalRelation(const char *relname,
 	rel->rd_rel->relpersistence = relpersistence;
 	switch (relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			rel->rd_backend = BackendIdForSessionRelations();
+			rel->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			rel->rd_backend = InvalidBackendId;
diff --git a/src/backend/utils/cache/syscache.c b/src/backend/utils/cache/syscache.c
index 16297a5..e7a4d3c 100644
--- a/src/backend/utils/cache/syscache.c
+++ b/src/backend/utils/cache/syscache.c
@@ -1164,6 +1164,16 @@ SearchSysCache4(int cacheId,
 	return SearchCatCache4(SysCache[cacheId], key1, key2, key3, key4);
 }
 
+void
+InsertSysCache(int cacheId,
+			   Datum key1, Datum key2, Datum key3, Datum key4,
+			   HeapTuple value)
+{
+	Assert(cacheId >= 0 && cacheId < SysCacheSize &&
+		   PointerIsValid(SysCache[cacheId]));
+	InsertCatCache(SysCache[cacheId], key1, key2, key3, key4, value);
+}
+
 /*
  * ReleaseSysCache
  *		Release previously grabbed reference count on a tuple
diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
index bf69adc..fa7479c 100644
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -15637,8 +15637,8 @@ dumpTableSchema(Archive *fout, TableInfo *tbinfo)
 											 tbinfo->dobj.catId.oid, false);
 
 		appendPQExpBuffer(q, "CREATE %s%s %s",
-						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ?
-						  "UNLOGGED " : "",
+						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ? "UNLOGGED "
+						  : tbinfo->relpersistence == RELPERSISTENCE_SESSION ? "SESSION " : "",
 						  reltypename,
 						  qualrelname);
 
diff --git a/src/common/relpath.c b/src/common/relpath.c
index 62b9553..cef99d2 100644
--- a/src/common/relpath.c
+++ b/src/common/relpath.c
@@ -166,7 +166,18 @@ GetRelationPath(Oid dbNode, Oid spcNode, Oid relNode,
 		}
 		else
 		{
-			if (forkNumber != MAIN_FORKNUM)
+			/*
+			 * Session relations are distinguished from local temp relations by adding
+			 * SessionRelFirstBackendId offset to backendId.
+			 * These is no need to separate them at file system level, so just subtract SessionRelFirstBackendId
+			 * to avoid too long file names.
+			 * Segments of session relations have the same prefix (t%d_) as local temporary relations
+			 * to make it possible to cleanup them in the same way as local temporary relation files.
+			 */
+			 if (backendId >= SessionRelFirstBackendId)
+				 backendId -= SessionRelFirstBackendId;
+
+			 if (forkNumber != MAIN_FORKNUM)
 				path = psprintf("base/%u/t%d_%u_%s",
 								dbNode, backendId, relNode,
 								forkNames[forkNumber]);
diff --git a/src/include/catalog/pg_class.h b/src/include/catalog/pg_class.h
index 090b6ba..6a39663 100644
--- a/src/include/catalog/pg_class.h
+++ b/src/include/catalog/pg_class.h
@@ -165,6 +165,7 @@ typedef FormData_pg_class *Form_pg_class;
 #define		  RELPERSISTENCE_PERMANENT	'p' /* regular table */
 #define		  RELPERSISTENCE_UNLOGGED	'u' /* unlogged permanent table */
 #define		  RELPERSISTENCE_TEMP		't' /* temporary table */
+#define		  RELPERSISTENCE_SESSION	's' /* session table */
 
 /* default selection for replica identity (primary key or nothing) */
 #define		  REPLICA_IDENTITY_DEFAULT	'd'
diff --git a/src/include/storage/backendid.h b/src/include/storage/backendid.h
index 70ef8eb..f226e7c 100644
--- a/src/include/storage/backendid.h
+++ b/src/include/storage/backendid.h
@@ -22,6 +22,13 @@ typedef int BackendId;			/* unique currently active backend identifier */
 
 #define InvalidBackendId		(-1)
 
+/*
+ * We need to distinguish local and global temporary relations by RelFileNodeBackend.
+ * The least invasive change is to add some special bias value to backend id (since 
+ * maximal number of backed is limited by MaxBackends).
+ */
+#define SessionRelFirstBackendId (0x40000000)
+
 extern PGDLLIMPORT BackendId MyBackendId;	/* backend id of this backend */
 
 /* backend id of our parallel session leader, or InvalidBackendId if none */
@@ -34,4 +41,10 @@ extern PGDLLIMPORT BackendId ParallelMasterBackendId;
 #define BackendIdForTempRelations() \
 	(ParallelMasterBackendId == InvalidBackendId ? MyBackendId : ParallelMasterBackendId)
 
+
+#define BackendIdForSessionRelations() \
+	(BackendIdForTempRelations() + SessionRelFirstBackendId)
+
+#define IsSessionRelationBackendId(id) ((id) >= SessionRelFirstBackendId)
+
 #endif							/* BACKENDID_H */
diff --git a/src/include/storage/bufpage.h b/src/include/storage/bufpage.h
index 4ef6d8d..bac7a31 100644
--- a/src/include/storage/bufpage.h
+++ b/src/include/storage/bufpage.h
@@ -229,6 +229,13 @@ typedef PageHeaderData *PageHeader;
 #define PageIsNew(page) (((PageHeader) (page))->pd_upper == 0)
 
 /*
+ * Page of temporary relation is not initialized
+ */
+#define GlobalTempRelationPageIsNotInitialized(rel, page) \
+	((rel)->rd_rel->relpersistence == RELPERSISTENCE_SESSION && PageIsNew(page))
+
+
+/*
  * PageGetItemId
  *		Returns an item identifier of a page.
  */
diff --git a/src/include/storage/relfilenode.h b/src/include/storage/relfilenode.h
index 586500a..20aec72 100644
--- a/src/include/storage/relfilenode.h
+++ b/src/include/storage/relfilenode.h
@@ -75,10 +75,25 @@ typedef struct RelFileNodeBackend
 	BackendId	backend;
 } RelFileNodeBackend;
 
+/*
+ * Check whether it is local or global temporary relation, which data belongs only to one backend.
+ */
 #define RelFileNodeBackendIsTemp(rnode) \
 	((rnode).backend != InvalidBackendId)
 
 /*
+ * Check whether it is global temporary relation which metadata is shared by all sessions,
+ * but data is private for the current session.
+ */
+#define RelFileNodeBackendIsGlobalTemp(rnode) IsSessionRelationBackendId((rnode).backend)
+
+/*
+ * Check whether it is local temporary relation which exists only in this backend.
+ */
+#define RelFileNodeBackendIsLocalTemp(rnode) \
+	(RelFileNodeBackendIsTemp(rnode) && !RelFileNodeBackendIsGlobalTemp(rnode))
+
+/*
  * Note: RelFileNodeEquals and RelFileNodeBackendEquals compare relNode first
  * since that is most likely to be different in two unequal RelFileNodes.  It
  * is probably redundant to compare spcNode if the other fields are found equal,
diff --git a/src/include/utils/catcache.h b/src/include/utils/catcache.h
index ff1faba..31f615d 100644
--- a/src/include/utils/catcache.h
+++ b/src/include/utils/catcache.h
@@ -228,4 +228,8 @@ extern void PrepareToInvalidateCacheTuple(Relation relation,
 extern void PrintCatCacheLeakWarning(HeapTuple tuple);
 extern void PrintCatCacheListLeakWarning(CatCList *list);
 
+extern void InsertCatCache(CatCache *cache,
+						   Datum v1, Datum v2, Datum v3, Datum v4,
+						   HeapTuple tuple);
+
 #endif							/* CATCACHE_H */
diff --git a/src/include/utils/rel.h b/src/include/utils/rel.h
index a5cf804..d42830f 100644
--- a/src/include/utils/rel.h
+++ b/src/include/utils/rel.h
@@ -327,6 +327,18 @@ typedef struct StdRdOptions
 	((relation)->rd_options ? \
 	 ((StdRdOptions *) (relation)->rd_options)->parallel_workers : (defaultpw))
 
+/*
+ * Relation persistence is either TEMP either SESSION
+ */
+#define IsLocalRelpersistence(relpersistence) \
+	((relpersistence) == RELPERSISTENCE_TEMP || (relpersistence) == RELPERSISTENCE_SESSION)
+
+/*
+ * Relation is either global either local temp table
+ */
+#define RelationHasSessionScope(relation) \
+	IsLocalRelpersistence(((relation)->rd_rel->relpersistence))
+
 /* ViewOptions->check_option values */
 typedef enum ViewOptCheckOption
 {
@@ -335,6 +347,7 @@ typedef enum ViewOptCheckOption
 	VIEW_OPTION_CHECK_OPTION_CASCADED
 } ViewOptCheckOption;
 
+
 /*
  * ViewOptions
  *		Contents of rd_options for views
@@ -526,7 +539,7 @@ typedef struct ViewOptions
  *		True if relation's pages are stored in local buffers.
  */
 #define RelationUsesLocalBuffers(relation) \
-	((relation)->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
+	RelationHasSessionScope(relation)
 
 /*
  * RELATION_IS_LOCAL
diff --git a/src/include/utils/syscache.h b/src/include/utils/syscache.h
index 918765c..5b1598b 100644
--- a/src/include/utils/syscache.h
+++ b/src/include/utils/syscache.h
@@ -216,4 +216,8 @@ extern bool RelationSupportsSysCache(Oid relid);
 
 #define ReleaseSysCacheList(x)	ReleaseCatCacheList(x)
 
+
+extern void InsertSysCache(int cacheId, 
+						   Datum v1, Datum v2, Datum v3, Datum v4,
+						   HeapTuple tuple);
 #endif							/* SYSCACHE_H */
diff --git a/src/test/isolation/expected/inherit-global-temp.out b/src/test/isolation/expected/inherit-global-temp.out
new file mode 100644
index 0000000..6114f8c
--- /dev/null
+++ b/src/test/isolation/expected/inherit-global-temp.out
@@ -0,0 +1,218 @@
+Parsed test spec with 2 sessions
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_update_p s1_update_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_update_p: UPDATE inh_global_parent SET a = 11 WHERE a = 1;
+step s1_update_c: UPDATE inh_global_parent SET a = 13 WHERE a IN (3, 5);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+2              
+11             
+4              
+13             
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+4              
+13             
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+2              
+11             
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_update_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_update_c: UPDATE inh_global_parent SET a = 15 WHERE a IN (3, 5);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+6              
+15             
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+6              
+15             
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_delete_p s1_delete_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_delete_p: DELETE FROM inh_global_parent WHERE a = 2;
+step s1_delete_c: DELETE FROM inh_global_parent WHERE a IN (4, 6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+3              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_delete_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_delete_c: DELETE FROM inh_global_parent WHERE a IN (4, 6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+5              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_truncate_p s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_truncate_p s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_truncate_p: TRUNCATE inh_global_parent;
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_begin s1_truncate_p s2_select_p s1_commit
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_begin: BEGIN;
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s2_select_p: SELECT a FROM inh_global_parent; <waiting ...>
+step s1_commit: COMMIT;
+step s2_select_p: <... completed>
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_begin s1_truncate_p s2_select_c s1_commit
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_begin: BEGIN;
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2; <waiting ...>
+step s1_commit: COMMIT;
+step s2_select_c: <... completed>
+a              
+
+5              
+6              
diff --git a/src/test/isolation/isolation_schedule b/src/test/isolation/isolation_schedule
index a2fa192..ef7aa85 100644
--- a/src/test/isolation/isolation_schedule
+++ b/src/test/isolation/isolation_schedule
@@ -88,3 +88,4 @@ test: plpgsql-toast
 test: truncate-conflict
 test: serializable-parallel
 test: serializable-parallel-2
+test: inherit-global-temp
diff --git a/src/test/isolation/specs/inherit-global-temp.spec b/src/test/isolation/specs/inherit-global-temp.spec
new file mode 100644
index 0000000..5e95dd6
--- /dev/null
+++ b/src/test/isolation/specs/inherit-global-temp.spec
@@ -0,0 +1,73 @@
+# This is a copy of the inherit-temp test with little changes for global temporary tables.
+#
+
+setup
+{
+  CREATE TABLE inh_global_parent (a int);
+}
+
+teardown
+{
+  DROP TABLE inh_global_parent;
+}
+
+# Session 1 executes actions which act directly on both the parent and
+# its child.  Abbreviation "c" is used for queries working on the child
+# and "p" on the parent.
+session "s1"
+setup
+{
+  CREATE GLOBAL TEMPORARY TABLE inh_global_temp_child_s1 () INHERITS (inh_global_parent);
+}
+step "s1_begin" { BEGIN; }
+step "s1_truncate_p" { TRUNCATE inh_global_parent; }
+step "s1_select_p" { SELECT a FROM inh_global_parent; }
+step "s1_select_c" { SELECT a FROM inh_global_temp_child_s1; }
+step "s1_insert_p" { INSERT INTO inh_global_parent VALUES (1), (2); }
+step "s1_insert_c" { INSERT INTO inh_global_temp_child_s1 VALUES (3), (4); }
+step "s1_update_p" { UPDATE inh_global_parent SET a = 11 WHERE a = 1; }
+step "s1_update_c" { UPDATE inh_global_parent SET a = 13 WHERE a IN (3, 5); }
+step "s1_delete_p" { DELETE FROM inh_global_parent WHERE a = 2; }
+step "s1_delete_c" { DELETE FROM inh_global_parent WHERE a IN (4, 6); }
+step "s1_commit" { COMMIT; }
+teardown
+{
+  DROP TABLE inh_global_temp_child_s1;
+}
+
+# Session 2 executes actions on the parent which act only on the child.
+session "s2"
+setup
+{
+  CREATE GLOBAL TEMPORARY TABLE inh_global_temp_child_s2 () INHERITS (inh_global_parent);
+}
+step "s2_truncate_p" { TRUNCATE inh_global_parent; }
+step "s2_select_p" { SELECT a FROM inh_global_parent; }
+step "s2_select_c" { SELECT a FROM inh_global_temp_child_s2; }
+step "s2_insert_c" { INSERT INTO inh_global_temp_child_s2 VALUES (5), (6); }
+step "s2_update_c" { UPDATE inh_global_parent SET a = 15 WHERE a IN (3, 5); }
+step "s2_delete_c" { DELETE FROM inh_global_parent WHERE a IN (4, 6); }
+teardown
+{
+  DROP TABLE inh_global_temp_child_s2;
+}
+
+# Check INSERT behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check UPDATE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_update_p" "s1_update_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_update_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check DELETE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_delete_p" "s1_delete_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_delete_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check TRUNCATE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_truncate_p" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_truncate_p" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# TRUNCATE on a parent tree does not block access to temporary child relation
+# of another session, and blocks when scanning the parent.
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_begin" "s1_truncate_p" "s2_select_p" "s1_commit"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_begin" "s1_truncate_p" "s2_select_c" "s1_commit"
diff --git a/src/test/regress/expected/global_temp.out b/src/test/regress/expected/global_temp.out
new file mode 100644
index 0000000..ae1adb6
--- /dev/null
+++ b/src/test/regress/expected/global_temp.out
@@ -0,0 +1,247 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+-- Test ON COMMIT DELETE ROWS
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+   2
+(2 rows)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+(1 row)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+ col 
+-----
+   1
+(1 row)
+
+SELECT * FROM global_temptest2;
+ col 
+-----
+(0 rows)
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+ERROR:  unsupported ON COMMIT and foreign key combination
+DETAIL:  Table "global_temptest4" references "global_temptest3", but they do not have the same ON COMMIT setting.
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+ a 
+---
+(0 rows)
+
+DROP TABLE temp_parted_oncommit;
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+              relname              
+-----------------------------------
+ global_temp_parted_oncommit_test
+ global_temp_parted_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_parted_oncommit_test;
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+            relname             
+--------------------------------
+ global_temp_inh_oncommit_test
+ global_temp_inh_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ERROR:  cannot inherit from temporary relation "global_temp_table"
+ROLLBACK;
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM global_temp_table;
+ a 
+---
+ 1
+(1 row)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+(2 rows)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       1
+(1 row)
+
+\c
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+(0 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       2
+(1 row)
+
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       3
+(1 row)
+
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
diff --git a/src/test/regress/expected/session_table.out b/src/test/regress/expected/session_table.out
new file mode 100644
index 0000000..1b9b3f4
--- /dev/null
+++ b/src/test/regress/expected/session_table.out
@@ -0,0 +1,64 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+ count 
+-------
+ 10000
+(1 row)
+
+\c
+select count(*) from my_private_table;
+ count 
+-------
+     0
+(1 row)
+
+select * from my_private_table where x=10001;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select * from my_private_table where y=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select count(*) from my_private_table;
+ count  
+--------
+ 100000
+(1 row)
+
+\c
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+   x    |   y    
+--------+--------
+ 100000 | 100000
+(1 row)
+
+drop table  my_private_table;
diff --git a/src/test/regress/parallel_schedule b/src/test/regress/parallel_schedule
index fc0f141..507cf7d 100644
--- a/src/test/regress/parallel_schedule
+++ b/src/test/regress/parallel_schedule
@@ -107,7 +107,7 @@ test: json jsonb json_encoding jsonpath jsonpath_encoding jsonb_jsonpath
 # NB: temp.sql does a reconnect which transiently uses 2 connections,
 # so keep this parallel group to at most 19 tests
 # ----------
-test: plancache limit plpgsql copy2 temp domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
+test: plancache limit plpgsql copy2 temp global_temp session_table domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
 
 # ----------
 # Another group of parallel tests
diff --git a/src/test/regress/serial_schedule b/src/test/regress/serial_schedule
index 68ac56a..3890777 100644
--- a/src/test/regress/serial_schedule
+++ b/src/test/regress/serial_schedule
@@ -172,6 +172,8 @@ test: limit
 test: plpgsql
 test: copy2
 test: temp
+test: global_temp
+test: session_table
 test: domain
 test: rangefuncs
 test: prepare
diff --git a/src/test/regress/sql/global_temp.sql b/src/test/regress/sql/global_temp.sql
new file mode 100644
index 0000000..3058b9b
--- /dev/null
+++ b/src/test/regress/sql/global_temp.sql
@@ -0,0 +1,151 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+
+-- Test ON COMMIT DELETE ROWS
+
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+SELECT * FROM global_temptest2;
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+DROP TABLE temp_parted_oncommit;
+
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+DROP TABLE global_temp_parted_oncommit_test;
+
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ROLLBACK;
+
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+COMMIT;
+SELECT * FROM global_temp_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+COMMIT;
+SELECT * FROM normal_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+\c
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
diff --git a/src/test/regress/sql/session_table.sql b/src/test/regress/sql/session_table.sql
new file mode 100644
index 0000000..c6663dc
--- /dev/null
+++ b/src/test/regress/sql/session_table.sql
@@ -0,0 +1,18 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+\c
+select count(*) from my_private_table;
+select * from my_private_table where x=10001;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+select * from my_private_table where y=10001;
+select count(*) from my_private_table;
+\c
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+drop table  my_private_table;

diff --git a/src/backend/access/brin/brin.c b/src/backend/access/brin/brin.c
index ae7b729..485c068 100644
--- a/src/backend/access/brin/brin.c
+++ b/src/backend/access/brin/brin.c
@@ -672,7 +672,7 @@ brinbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	/*
 	 * We expect to be called exactly once for any index relation.
 	 */
-	if (RelationGetNumberOfBlocks(index) != 0)
+	if (RelationGetNumberOfBlocks(index) != 0 && index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
 		elog(ERROR, "index \"%s\" already contains data",
 			 RelationGetRelationName(index));
 
@@ -681,9 +681,17 @@ brinbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	 * whole relation will be rolled back.
 	 */
 
-	meta = ReadBuffer(index, P_NEW);
-	Assert(BufferGetBlockNumber(meta) == BRIN_METAPAGE_BLKNO);
-	LockBuffer(meta, BUFFER_LOCK_EXCLUSIVE);
+	if (index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
+	{
+		meta = ReadBuffer(index, P_NEW);
+		Assert(BufferGetBlockNumber(meta) == BRIN_METAPAGE_BLKNO);
+		LockBuffer(meta, BUFFER_LOCK_EXCLUSIVE);
+	}
+	else
+	{
+		meta = ReadBuffer(index, BRIN_METAPAGE_BLKNO);
+		LockBuffer(meta, BUFFER_LOCK_SHARE);
+	}
 
 	brin_metapage_init(BufferGetPage(meta), BrinGetPagesPerRange(index),
 					   BRIN_CURRENT_VERSION);
diff --git a/src/backend/access/brin/brin_revmap.c b/src/backend/access/brin/brin_revmap.c
index 647350c..62e5212 100644
--- a/src/backend/access/brin/brin_revmap.c
+++ b/src/backend/access/brin/brin_revmap.c
@@ -25,6 +25,7 @@
 #include "access/brin_revmap.h"
 #include "access/brin_tuple.h"
 #include "access/brin_xlog.h"
+#include "access/brin.h"
 #include "access/rmgr.h"
 #include "access/xloginsert.h"
 #include "miscadmin.h"
@@ -79,6 +80,13 @@ brinRevmapInitialize(Relation idxrel, BlockNumber *pagesPerRange,
 	meta = ReadBuffer(idxrel, BRIN_METAPAGE_BLKNO);
 	LockBuffer(meta, BUFFER_LOCK_SHARE);
 	page = BufferGetPage(meta);
+
+	if (GlobalTempRelationPageIsNotInitialized(idxrel, page))
+	{
+		Relation heap = RelationIdGetRelation(idxrel->rd_index->indrelid);
+		brinbuild(heap, idxrel,  BuildIndexInfo(idxrel));
+		RelationClose(heap);
+	}
 	TestForOldSnapshot(snapshot, idxrel, page);
 	metadata = (BrinMetaPageData *) PageGetContents(page);
 
diff --git a/src/backend/access/common/reloptions.c b/src/backend/access/common/reloptions.c
index b5072c0..650f31a 100644
--- a/src/backend/access/common/reloptions.c
+++ b/src/backend/access/common/reloptions.c
@@ -158,6 +158,19 @@ static relopt_bool boolRelOpts[] =
 		},
 		true
 	},
+	/*
+	 * For global temp table only
+	 * use AccessExclusiveLock for ensure safety
+	 */
+	{
+		{
+			"on_commit_delete_rows",
+			"global temp table on commit options",
+			RELOPT_KIND_HEAP | RELOPT_KIND_PARTITIONED,
+			ShareUpdateExclusiveLock
+		},
+		false
+	},
 	/* list terminator */
 	{{NULL}}
 };
@@ -1478,6 +1491,8 @@ default_reloptions(Datum reloptions, bool validate, relopt_kind kind)
 	StdRdOptions *rdopts;
 	int			numoptions;
 	static const relopt_parse_elt tab[] = {
+		{"on_commit_delete_rows", RELOPT_TYPE_BOOL,
+		offsetof(StdRdOptions, on_commit_delete_rows)},
 		{"fillfactor", RELOPT_TYPE_INT, offsetof(StdRdOptions, fillfactor)},
 		{"autovacuum_enabled", RELOPT_TYPE_BOOL,
 		offsetof(StdRdOptions, autovacuum) + offsetof(AutoVacOpts, enabled)},
diff --git a/src/backend/access/gin/ginfast.c b/src/backend/access/gin/ginfast.c
index 439a91b..51fe102 100644
--- a/src/backend/access/gin/ginfast.c
+++ b/src/backend/access/gin/ginfast.c
@@ -241,6 +241,13 @@ ginHeapTupleFastInsert(GinState *ginstate, GinTupleCollector *collector)
 	metabuffer = ReadBuffer(index, GIN_METAPAGE_BLKNO);
 	metapage = BufferGetPage(metabuffer);
 
+	if (GlobalTempRelationPageIsNotInitialized(index, metapage))
+	{
+		Relation heap = RelationIdGetRelation(index->rd_index->indrelid);
+		ginbuild(heap, index, BuildIndexInfo(index));
+		RelationClose(heap);
+	}
+
 	/*
 	 * An insertion to the pending list could logically belong anywhere in the
 	 * tree, so it conflicts with all serializable scans.  All scans acquire a
diff --git a/src/backend/access/gin/ginget.c b/src/backend/access/gin/ginget.c
index b18ae2b..975c186 100644
--- a/src/backend/access/gin/ginget.c
+++ b/src/backend/access/gin/ginget.c
@@ -1759,7 +1759,8 @@ scanPendingInsert(IndexScanDesc scan, TIDBitmap *tbm, int64 *ntids)
 				match;
 	int			i;
 	pendingPosition pos;
-	Buffer		metabuffer = ReadBuffer(scan->indexRelation, GIN_METAPAGE_BLKNO);
+	Relation    index = scan->indexRelation;
+	Buffer		metabuffer = ReadBuffer(index, GIN_METAPAGE_BLKNO);
 	Page		page;
 	BlockNumber blkno;
 
@@ -1769,11 +1770,19 @@ scanPendingInsert(IndexScanDesc scan, TIDBitmap *tbm, int64 *ntids)
 	 * Acquire predicate lock on the metapage, to conflict with any fastupdate
 	 * insertions.
 	 */
-	PredicateLockPage(scan->indexRelation, GIN_METAPAGE_BLKNO, scan->xs_snapshot);
+	PredicateLockPage(index, GIN_METAPAGE_BLKNO, scan->xs_snapshot);
 
 	LockBuffer(metabuffer, GIN_SHARE);
 	page = BufferGetPage(metabuffer);
-	TestForOldSnapshot(scan->xs_snapshot, scan->indexRelation, page);
+	TestForOldSnapshot(scan->xs_snapshot, index, page);
+
+	if (GlobalTempRelationPageIsNotInitialized(index, page))
+	{
+		Relation heap = RelationIdGetRelation(index->rd_index->indrelid);
+		ginbuild(heap, index, BuildIndexInfo(index));
+		RelationClose(heap);
+		UnlockReleaseBuffer(metabuffer);
+	}
 	blkno = GinPageGetMeta(page)->head;
 
 	/*
@@ -1784,10 +1793,10 @@ scanPendingInsert(IndexScanDesc scan, TIDBitmap *tbm, int64 *ntids)
 	{
 		/* No pending list, so proceed with normal scan */
 		UnlockReleaseBuffer(metabuffer);
-		return;
+		return true;
 	}
 
-	pos.pendingBuffer = ReadBuffer(scan->indexRelation, blkno);
+	pos.pendingBuffer = ReadBuffer(index, blkno);
 	LockBuffer(pos.pendingBuffer, GIN_SHARE);
 	pos.firstOffset = FirstOffsetNumber;
 	UnlockReleaseBuffer(metabuffer);
diff --git a/src/backend/access/gin/gininsert.c b/src/backend/access/gin/gininsert.c
index 55eab14..d6739f3 100644
--- a/src/backend/access/gin/gininsert.c
+++ b/src/backend/access/gin/gininsert.c
@@ -328,7 +328,7 @@ ginbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	MemoryContext oldCtx;
 	OffsetNumber attnum;
 
-	if (RelationGetNumberOfBlocks(index) != 0)
+	if (RelationGetNumberOfBlocks(index) != 0 && index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
 		elog(ERROR, "index \"%s\" already contains data",
 			 RelationGetRelationName(index));
 
@@ -337,7 +337,15 @@ ginbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	memset(&buildstate.buildStats, 0, sizeof(GinStatsData));
 
 	/* initialize the meta page */
-	MetaBuffer = GinNewBuffer(index);
+	if (index->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
+	{
+		MetaBuffer = ReadBuffer(index, 0);
+		LockBuffer(MetaBuffer, GIN_SHARE);
+	}
+	else
+	{
+		MetaBuffer = GinNewBuffer(index);
+	}
 
 	/* initialize the root page */
 	RootBuffer = GinNewBuffer(index);
diff --git a/src/backend/access/gist/gist.c b/src/backend/access/gist/gist.c
index 0cc8791..bcde5ea 100644
--- a/src/backend/access/gist/gist.c
+++ b/src/backend/access/gist/gist.c
@@ -16,6 +16,7 @@
 
 #include "access/gist_private.h"
 #include "access/gistscan.h"
+#include "catalog/index.h"
 #include "catalog/pg_collation.h"
 #include "miscadmin.h"
 #include "storage/lmgr.h"
@@ -677,7 +678,10 @@ gistdoinsert(Relation r, IndexTuple itup, Size freespace,
 		if (!xlocked)
 		{
 			LockBuffer(stack->buffer, GIST_SHARE);
-			gistcheckpage(state.r, stack->buffer);
+			if (stack->blkno == GIST_ROOT_BLKNO && GlobalTempRelationPageIsNotInitialized(state.r, BufferGetPage(stack->buffer)))
+				gistbuild(heapRel, r, BuildIndexInfo(r));
+			else
+				gistcheckpage(state.r, stack->buffer);
 		}
 
 		stack->page = (Page) BufferGetPage(stack->buffer);
diff --git a/src/backend/access/gist/gistbuild.c b/src/backend/access/gist/gistbuild.c
index 2f4543d..8d194c8 100644
--- a/src/backend/access/gist/gistbuild.c
+++ b/src/backend/access/gist/gistbuild.c
@@ -156,7 +156,7 @@ gistbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	 * We expect to be called exactly once for any index relation. If that's
 	 * not the case, big trouble's what we have.
 	 */
-	if (RelationGetNumberOfBlocks(index) != 0)
+	if (RelationGetNumberOfBlocks(index) != 0 && index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
 		elog(ERROR, "index \"%s\" already contains data",
 			 RelationGetRelationName(index));
 
@@ -171,8 +171,16 @@ gistbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	buildstate.giststate->tempCxt = createTempGistContext();
 
 	/* initialize the root page */
-	buffer = gistNewBuffer(index);
-	Assert(BufferGetBlockNumber(buffer) == GIST_ROOT_BLKNO);
+	if (index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
+	{
+		buffer = gistNewBuffer(index);
+		Assert(BufferGetBlockNumber(buffer) == GIST_ROOT_BLKNO);
+	}
+	else
+	{
+		buffer = ReadBuffer(index, GIST_ROOT_BLKNO);
+		LockBuffer(buffer, GIST_SHARE);
+	}
 	page = BufferGetPage(buffer);
 
 	START_CRIT_SECTION();
diff --git a/src/backend/access/gist/gistget.c b/src/backend/access/gist/gistget.c
index 22d790d..5560a41 100644
--- a/src/backend/access/gist/gistget.c
+++ b/src/backend/access/gist/gistget.c
@@ -17,8 +17,10 @@
 #include "access/genam.h"
 #include "access/gist_private.h"
 #include "access/relscan.h"
+#include "catalog/index.h"
 #include "miscadmin.h"
 #include "storage/lmgr.h"
+#include "storage/freespace.h"
 #include "storage/predicate.h"
 #include "pgstat.h"
 #include "lib/pairingheap.h"
@@ -344,7 +346,10 @@ gistScanPage(IndexScanDesc scan, GISTSearchItem *pageItem,
 	buffer = ReadBuffer(scan->indexRelation, pageItem->blkno);
 	LockBuffer(buffer, GIST_SHARE);
 	PredicateLockPage(r, BufferGetBlockNumber(buffer), scan->xs_snapshot);
-	gistcheckpage(scan->indexRelation, buffer);
+	if (pageItem->blkno == GIST_ROOT_BLKNO && GlobalTempRelationPageIsNotInitialized(r, BufferGetPage(buffer)))
+		gistbuild(scan->heapRelation, r, BuildIndexInfo(r));
+	else
+		gistcheckpage(scan->indexRelation, buffer);
 	page = BufferGetPage(buffer);
 	TestForOldSnapshot(scan->xs_snapshot, r, page);
 	opaque = GistPageGetOpaque(page);
diff --git a/src/backend/access/gist/gistutil.c b/src/backend/access/gist/gistutil.c
index 45804d7..50b306a 100644
--- a/src/backend/access/gist/gistutil.c
+++ b/src/backend/access/gist/gistutil.c
@@ -1028,7 +1028,7 @@ gistGetFakeLSN(Relation rel)
 {
 	static XLogRecPtr counter = FirstNormalUnloggedLSN;
 
-	if (rel->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
+	if (RelationHasSessionScope(rel))
 	{
 		/*
 		 * Temporary relations are only accessible in our session, so a simple
diff --git a/src/backend/access/hash/hash.c b/src/backend/access/hash/hash.c
index 5cc30da..1b228db 100644
--- a/src/backend/access/hash/hash.c
+++ b/src/backend/access/hash/hash.c
@@ -119,7 +119,7 @@ hashbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	 * We expect to be called exactly once for any index relation. If that's
 	 * not the case, big trouble's what we have.
 	 */
-	if (RelationGetNumberOfBlocks(index) != 0)
+	if (RelationGetNumberOfBlocks(index) != 0 && index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
 		elog(ERROR, "index \"%s\" already contains data",
 			 RelationGetRelationName(index));
 
diff --git a/src/backend/access/hash/hashpage.c b/src/backend/access/hash/hashpage.c
index 838ee68..00ba123 100644
--- a/src/backend/access/hash/hashpage.c
+++ b/src/backend/access/hash/hashpage.c
@@ -75,13 +75,22 @@ _hash_getbuf(Relation rel, BlockNumber blkno, int access, int flags)
 
 	buf = ReadBuffer(rel, blkno);
 
-	if (access != HASH_NOLOCK)
-		LockBuffer(buf, access);
-
 	/* ref count and lock type are correct */
 
-	_hash_checkpage(rel, buf, flags);
-
+	if (blkno == HASH_METAPAGE && GlobalTempRelationPageIsNotInitialized(rel, BufferGetPage(buf)))
+	{
+		Relation heap = RelationIdGetRelation(rel->rd_index->indrelid);
+		hashbuild(heap, rel, BuildIndexInfo(rel));
+		RelationClose(heap);
+		if (access != HASH_NOLOCK)
+			LockBuffer(buf, access);
+	}
+	else
+	{
+		if (access != HASH_NOLOCK)
+			LockBuffer(buf, access);
+		_hash_checkpage(rel, buf, flags);
+	}
 	return buf;
 }
 
@@ -339,7 +348,7 @@ _hash_init(Relation rel, double num_tuples, ForkNumber forkNum)
 	bool		use_wal;
 
 	/* safety check */
-	if (RelationGetNumberOfBlocksInFork(rel, forkNum) != 0)
+	if (rel->rd_rel->relpersistence != RELPERSISTENCE_SESSION && RelationGetNumberOfBlocksInFork(rel, forkNum) != 0)
 		elog(ERROR, "cannot initialize non-empty hash index \"%s\"",
 			 RelationGetRelationName(rel));
 
diff --git a/src/backend/access/heap/heapam_handler.c b/src/backend/access/heap/heapam_handler.c
index 2dd8821..92df373 100644
--- a/src/backend/access/heap/heapam_handler.c
+++ b/src/backend/access/heap/heapam_handler.c
@@ -673,6 +673,7 @@ heapam_relation_copy_data(Relation rel, const RelFileNode *newrnode)
 			 * init fork of an unlogged relation.
 			 */
 			if (rel->rd_rel->relpersistence == RELPERSISTENCE_PERMANENT ||
+				rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ||
 				(rel->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED &&
 				 forkNum == INIT_FORKNUM))
 				log_smgrcreate(newrnode, forkNum);
diff --git a/src/backend/access/nbtree/nbtpage.c b/src/backend/access/nbtree/nbtpage.c
index 268f869..eff9e10 100644
--- a/src/backend/access/nbtree/nbtpage.c
+++ b/src/backend/access/nbtree/nbtpage.c
@@ -27,8 +27,10 @@
 #include "access/transam.h"
 #include "access/xlog.h"
 #include "access/xloginsert.h"
+#include "catalog/index.h"
 #include "miscadmin.h"
 #include "storage/indexfsm.h"
+#include "storage/buf_internals.h"
 #include "storage/lmgr.h"
 #include "storage/predicate.h"
 #include "utils/snapmgr.h"
@@ -762,8 +764,22 @@ _bt_getbuf(Relation rel, BlockNumber blkno, int access)
 	{
 		/* Read an existing block of the relation */
 		buf = ReadBuffer(rel, blkno);
-		LockBuffer(buf, access);
-		_bt_checkpage(rel, buf);
+		/* Session temporary relation may be not yet initialized for this backend. */
+		if (blkno == BTREE_METAPAGE && GlobalTempRelationPageIsNotInitialized(rel, BufferGetPage(buf)))
+		{
+			Relation heap = RelationIdGetRelation(rel->rd_index->indrelid);
+			ReleaseBuffer(buf);
+			DropRelFileNodeLocalBuffers(rel->rd_node, MAIN_FORKNUM, blkno);
+			btbuild(heap, rel, BuildIndexInfo(rel));
+			RelationClose(heap);
+			buf = ReadBuffer(rel, blkno);
+			LockBuffer(buf, access);
+		}
+		else
+		{
+			LockBuffer(buf, access);
+			_bt_checkpage(rel, buf);
+		}
 	}
 	else
 	{
diff --git a/src/backend/access/nbtree/nbtsort.c b/src/backend/access/nbtree/nbtsort.c
index ab19692..227bc19 100644
--- a/src/backend/access/nbtree/nbtsort.c
+++ b/src/backend/access/nbtree/nbtsort.c
@@ -330,7 +330,7 @@ btbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	 * We expect to be called exactly once for any index relation. If that's
 	 * not the case, big trouble's what we have.
 	 */
-	if (RelationGetNumberOfBlocks(index) != 0)
+	if (RelationGetNumberOfBlocks(index) != 0 && index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
 		elog(ERROR, "index \"%s\" already contains data",
 			 RelationGetRelationName(index));
 
diff --git a/src/backend/access/spgist/spginsert.c b/src/backend/access/spgist/spginsert.c
index b40bd44..f44bec7 100644
--- a/src/backend/access/spgist/spginsert.c
+++ b/src/backend/access/spgist/spginsert.c
@@ -81,21 +81,32 @@ spgbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 				rootbuffer,
 				nullbuffer;
 
-	if (RelationGetNumberOfBlocks(index) != 0)
-		elog(ERROR, "index \"%s\" already contains data",
-			 RelationGetRelationName(index));
-
-	/*
-	 * Initialize the meta page and root pages
-	 */
-	metabuffer = SpGistNewBuffer(index);
-	rootbuffer = SpGistNewBuffer(index);
-	nullbuffer = SpGistNewBuffer(index);
-
-	Assert(BufferGetBlockNumber(metabuffer) == SPGIST_METAPAGE_BLKNO);
-	Assert(BufferGetBlockNumber(rootbuffer) == SPGIST_ROOT_BLKNO);
-	Assert(BufferGetBlockNumber(nullbuffer) == SPGIST_NULL_BLKNO);
-
+	if (index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
+	{
+		if (RelationGetNumberOfBlocks(index) != 0)
+			elog(ERROR, "index \"%s\" already contains data",
+				 RelationGetRelationName(index));
+
+		/*
+		 * Initialize the meta page and root pages
+		 */
+		metabuffer = SpGistNewBuffer(index);
+		rootbuffer = SpGistNewBuffer(index);
+		nullbuffer = SpGistNewBuffer(index);
+
+		Assert(BufferGetBlockNumber(metabuffer) == SPGIST_METAPAGE_BLKNO);
+		Assert(BufferGetBlockNumber(rootbuffer) == SPGIST_ROOT_BLKNO);
+		Assert(BufferGetBlockNumber(nullbuffer) == SPGIST_NULL_BLKNO);
+	}
+	else
+	{
+		metabuffer = ReadBuffer(index, SPGIST_METAPAGE_BLKNO);
+		rootbuffer = ReadBuffer(index, SPGIST_ROOT_BLKNO);
+		nullbuffer = ReadBuffer(index, SPGIST_NULL_BLKNO);
+		LockBuffer(metabuffer, BUFFER_LOCK_SHARE);
+		LockBuffer(rootbuffer, BUFFER_LOCK_SHARE);
+		LockBuffer(nullbuffer, BUFFER_LOCK_SHARE);
+	}
 	START_CRIT_SECTION();
 
 	SpGistInitMetapage(BufferGetPage(metabuffer));
diff --git a/src/backend/access/spgist/spgutils.c b/src/backend/access/spgist/spgutils.c
index 45472db..ea15964 100644
--- a/src/backend/access/spgist/spgutils.c
+++ b/src/backend/access/spgist/spgutils.c
@@ -21,6 +21,7 @@
 #include "access/spgist_private.h"
 #include "access/transam.h"
 #include "access/xact.h"
+#include "catalog/index.h"
 #include "catalog/pg_amop.h"
 #include "storage/bufmgr.h"
 #include "storage/indexfsm.h"
@@ -106,6 +107,7 @@ spgGetCache(Relation index)
 		spgConfigIn in;
 		FmgrInfo   *procinfo;
 		Buffer		metabuffer;
+		Page        metapage;
 		SpGistMetaPageData *metadata;
 
 		cache = MemoryContextAllocZero(index->rd_indexcxt,
@@ -155,12 +157,21 @@ spgGetCache(Relation index)
 		metabuffer = ReadBuffer(index, SPGIST_METAPAGE_BLKNO);
 		LockBuffer(metabuffer, BUFFER_LOCK_SHARE);
 
-		metadata = SpGistPageGetMeta(BufferGetPage(metabuffer));
+		metapage = BufferGetPage(metabuffer);
+		metadata = SpGistPageGetMeta(metapage);
 
 		if (metadata->magicNumber != SPGIST_MAGIC_NUMBER)
-			elog(ERROR, "index \"%s\" is not an SP-GiST index",
-				 RelationGetRelationName(index));
-
+		{
+			if (GlobalTempRelationPageIsNotInitialized(index, metapage))
+			{
+				Relation heap = RelationIdGetRelation(index->rd_index->indrelid);
+				spgbuild(heap, index, BuildIndexInfo(index));
+				RelationClose(heap);
+			}
+			else
+				elog(ERROR, "index \"%s\" is not an SP-GiST index",
+					 RelationGetRelationName(index));
+		}
 		cache->lastUsedPages = metadata->lastUsedPages;
 
 		UnlockReleaseBuffer(metabuffer);
diff --git a/src/backend/catalog/catalog.c b/src/backend/catalog/catalog.c
index 1af31c2..e60bdb7 100644
--- a/src/backend/catalog/catalog.c
+++ b/src/backend/catalog/catalog.c
@@ -402,6 +402,9 @@ GetNewRelFileNode(Oid reltablespace, Relation pg_class, char relpersistence)
 		case RELPERSISTENCE_TEMP:
 			backend = BackendIdForTempRelations();
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index f6c31cc..d943b57 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3652,7 +3652,7 @@ reindex_relation(Oid relid, int flags, int options)
 		if (flags & REINDEX_REL_FORCE_INDEXES_UNLOGGED)
 			persistence = RELPERSISTENCE_UNLOGGED;
 		else if (flags & REINDEX_REL_FORCE_INDEXES_PERMANENT)
-			persistence = RELPERSISTENCE_PERMANENT;
+			persistence = rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ? RELPERSISTENCE_SESSION : RELPERSISTENCE_PERMANENT;
 		else
 			persistence = rel->rd_rel->relpersistence;
 
diff --git a/src/backend/catalog/storage.c b/src/backend/catalog/storage.c
index 625af8d..1e192fa 100644
--- a/src/backend/catalog/storage.c
+++ b/src/backend/catalog/storage.c
@@ -93,6 +93,10 @@ RelationCreateStorage(RelFileNode rnode, char relpersistence)
 			backend = InvalidBackendId;
 			needs_wal = false;
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			needs_wal = false;
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
 			needs_wal = true;
diff --git a/src/backend/commands/analyze.c b/src/backend/commands/analyze.c
index 7accb95..9f2ea48 100644
--- a/src/backend/commands/analyze.c
+++ b/src/backend/commands/analyze.c
@@ -102,7 +102,7 @@ static int	acquire_inherited_sample_rows(Relation onerel, int elevel,
 										  HeapTuple *rows, int targrows,
 										  double *totalrows, double *totaldeadrows);
 static void update_attstats(Oid relid, bool inh,
-							int natts, VacAttrStats **vacattrstats);
+							int natts, VacAttrStats **vacattrstats, bool is_global_temp);
 static Datum std_fetch_func(VacAttrStatsP stats, int rownum, bool *isNull);
 static Datum ind_fetch_func(VacAttrStatsP stats, int rownum, bool *isNull);
 
@@ -318,6 +318,7 @@ do_analyze_rel(Relation onerel, VacuumParams *params,
 	Oid			save_userid;
 	int			save_sec_context;
 	int			save_nestlevel;
+	bool        is_global_temp = onerel->rd_rel->relpersistence == RELPERSISTENCE_SESSION;
 
 	if (inh)
 		ereport(elevel,
@@ -575,14 +576,14 @@ do_analyze_rel(Relation onerel, VacuumParams *params,
 		 * pg_statistic for columns we didn't process, we leave them alone.)
 		 */
 		update_attstats(RelationGetRelid(onerel), inh,
-						attr_cnt, vacattrstats);
+						attr_cnt, vacattrstats, is_global_temp);
 
 		for (ind = 0; ind < nindexes; ind++)
 		{
 			AnlIndexData *thisdata = &indexdata[ind];
 
 			update_attstats(RelationGetRelid(Irel[ind]), false,
-							thisdata->attr_cnt, thisdata->vacattrstats);
+							thisdata->attr_cnt, thisdata->vacattrstats, is_global_temp);
 		}
 
 		/*
@@ -1425,7 +1426,7 @@ acquire_inherited_sample_rows(Relation onerel, int elevel,
  *		by taking a self-exclusive lock on the relation in analyze_rel().
  */
 static void
-update_attstats(Oid relid, bool inh, int natts, VacAttrStats **vacattrstats)
+update_attstats(Oid relid, bool inh, int natts, VacAttrStats **vacattrstats, bool is_global_temp)
 {
 	Relation	sd;
 	int			attno;
@@ -1527,30 +1528,42 @@ update_attstats(Oid relid, bool inh, int natts, VacAttrStats **vacattrstats)
 			}
 		}
 
-		/* Is there already a pg_statistic tuple for this attribute? */
-		oldtup = SearchSysCache3(STATRELATTINH,
-								 ObjectIdGetDatum(relid),
-								 Int16GetDatum(stats->attr->attnum),
-								 BoolGetDatum(inh));
-
-		if (HeapTupleIsValid(oldtup))
+		if (is_global_temp)
 		{
-			/* Yes, replace it */
-			stup = heap_modify_tuple(oldtup,
-									 RelationGetDescr(sd),
-									 values,
-									 nulls,
-									 replaces);
-			ReleaseSysCache(oldtup);
-			CatalogTupleUpdate(sd, &stup->t_self, stup);
+			stup = heap_form_tuple(RelationGetDescr(sd), values, nulls);
+			InsertSysCache(STATRELATTINH,
+						   ObjectIdGetDatum(relid),
+						   Int16GetDatum(stats->attr->attnum),
+						   BoolGetDatum(inh),
+						   0,
+						   stup);
 		}
 		else
 		{
-			/* No, insert new tuple */
-			stup = heap_form_tuple(RelationGetDescr(sd), values, nulls);
-			CatalogTupleInsert(sd, stup);
-		}
+			/* Is there already a pg_statistic tuple for this attribute? */
+			oldtup = SearchSysCache3(STATRELATTINH,
+									 ObjectIdGetDatum(relid),
+									 Int16GetDatum(stats->attr->attnum),
+									 BoolGetDatum(inh));
 
+			if (HeapTupleIsValid(oldtup))
+			{
+				/* Yes, replace it */
+				stup = heap_modify_tuple(oldtup,
+										 RelationGetDescr(sd),
+										 values,
+										 nulls,
+										 replaces);
+				ReleaseSysCache(oldtup);
+				CatalogTupleUpdate(sd, &stup->t_self, stup);
+			}
+			else
+			{
+				/* No, insert new tuple */
+				stup = heap_form_tuple(RelationGetDescr(sd), values, nulls);
+				CatalogTupleInsert(sd, stup);
+			}
+		}
 		heap_freetuple(stup);
 	}
 
diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index a23128d..5d131a7 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -1400,7 +1400,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap,
 	 */
 	if (newrelpersistence == RELPERSISTENCE_UNLOGGED)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_UNLOGGED;
-	else if (newrelpersistence == RELPERSISTENCE_PERMANENT)
+	else if (newrelpersistence != RELPERSISTENCE_TEMP)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_PERMANENT;
 
 	/* Report that we are now reindexing relations */
diff --git a/src/backend/commands/sequence.c b/src/backend/commands/sequence.c
index a13322b..be661a4 100644
--- a/src/backend/commands/sequence.c
+++ b/src/backend/commands/sequence.c
@@ -94,7 +94,7 @@ static HTAB *seqhashtab = NULL; /* hash table for SeqTable items */
  */
 static SeqTableData *last_used_seq = NULL;
 
-static void fill_seq_with_data(Relation rel, HeapTuple tuple);
+static void fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf);
 static Relation lock_and_open_sequence(SeqTable seq);
 static void create_seq_hashtable(void);
 static void init_sequence(Oid relid, SeqTable *p_elm, Relation *p_rel);
@@ -222,7 +222,7 @@ DefineSequence(ParseState *pstate, CreateSeqStmt *seq)
 
 	/* now initialize the sequence's data */
 	tuple = heap_form_tuple(tupDesc, value, null);
-	fill_seq_with_data(rel, tuple);
+	fill_seq_with_data(rel, tuple, InvalidBuffer);
 
 	/* process OWNED BY if given */
 	if (owned_by)
@@ -327,7 +327,7 @@ ResetSequence(Oid seq_relid)
 	/*
 	 * Insert the modified tuple into the new storage file.
 	 */
-	fill_seq_with_data(seq_rel, tuple);
+	fill_seq_with_data(seq_rel, tuple, InvalidBuffer);
 
 	/* Clear local cache so that we don't think we have cached numbers */
 	/* Note that we do not change the currval() state */
@@ -340,18 +340,21 @@ ResetSequence(Oid seq_relid)
  * Initialize a sequence's relation with the specified tuple as content
  */
 static void
-fill_seq_with_data(Relation rel, HeapTuple tuple)
+fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf)
 {
-	Buffer		buf;
 	Page		page;
 	sequence_magic *sm;
 	OffsetNumber offnum;
+	bool lockBuffer = false;
 
 	/* Initialize first page of relation with special magic number */
 
-	buf = ReadBuffer(rel, P_NEW);
-	Assert(BufferGetBlockNumber(buf) == 0);
-
+	if (buf == InvalidBuffer)
+	{
+		buf = ReadBuffer(rel, P_NEW);
+		Assert(BufferGetBlockNumber(buf) == 0);
+		lockBuffer = true;
+	}
 	page = BufferGetPage(buf);
 
 	PageInit(page, BufferGetPageSize(buf), sizeof(sequence_magic));
@@ -360,7 +363,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	/* Now insert sequence tuple */
 
-	LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
+	if (lockBuffer)
+		LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
 
 	/*
 	 * Since VACUUM does not process sequences, we have to force the tuple to
@@ -410,7 +414,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	END_CRIT_SECTION();
 
-	UnlockReleaseBuffer(buf);
+	if (lockBuffer)
+		UnlockReleaseBuffer(buf);
 }
 
 /*
@@ -502,7 +507,7 @@ AlterSequence(ParseState *pstate, AlterSeqStmt *stmt)
 		/*
 		 * Insert the modified tuple into the new storage file.
 		 */
-		fill_seq_with_data(seqrel, newdatatuple);
+		fill_seq_with_data(seqrel, newdatatuple, InvalidBuffer);
 	}
 
 	/* process OWNED BY if given */
@@ -1178,6 +1183,17 @@ read_seq_tuple(Relation rel, Buffer *buf, HeapTuple seqdatatuple)
 	LockBuffer(*buf, BUFFER_LOCK_EXCLUSIVE);
 
 	page = BufferGetPage(*buf);
+	if (GlobalTempRelationPageIsNotInitialized(rel, page))
+	{
+		/* Initialize sequence for global temporary tables */
+		Datum		value[SEQ_COL_LASTCOL] = {0};
+		bool		null[SEQ_COL_LASTCOL] = {false};
+		HeapTuple tuple;
+		value[SEQ_COL_LASTVAL-1] = Int64GetDatumFast(1); /* start sequence with 1 */
+		tuple = heap_form_tuple(RelationGetDescr(rel), value, null);
+		fill_seq_with_data(rel, tuple, *buf);
+	}
+
 	sm = (sequence_magic *) PageGetSpecialPointer(page);
 
 	if (sm->magic != SEQ_MAGIC)
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 8d25d14..21d5a30 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -12,6 +12,9 @@
  *
  *-------------------------------------------------------------------------
  */
+#include <sys/stat.h>
+#include <unistd.h>
+
 #include "postgres.h"
 
 #include "access/genam.h"
@@ -533,6 +536,23 @@ static List *GetParentedForeignKeyRefs(Relation partition);
 static void ATDetachCheckNoForeignKeyRefs(Relation partition);
 
 
+static bool
+has_oncommit_option(List *options)
+{
+	ListCell   *listptr;
+
+	foreach(listptr, options)
+	{
+		DefElem    *def = (DefElem *) lfirst(listptr);
+
+		if (pg_strcasecmp(def->defname, "on_commit_delete_rows") == 0)
+			return true;
+	}
+
+	return false;
+}
+
+
 /* ----------------------------------------------------------------
  *		DefineRelation
  *				Creates a new relation.
@@ -576,6 +596,7 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 	LOCKMODE	parentLockmode;
 	const char *accessMethod = NULL;
 	Oid			accessMethodId = InvalidOid;
+	bool		has_oncommit_clause = false;
 
 	/*
 	 * Truncate relname to appropriate length (probably a waste of time, as
@@ -587,7 +608,7 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 	 * Check consistency of arguments
 	 */
 	if (stmt->oncommit != ONCOMMIT_NOOP
-		&& stmt->relation->relpersistence != RELPERSISTENCE_TEMP)
+		&& !IsLocalRelpersistence(stmt->relation->relpersistence))
 		ereport(ERROR,
 				(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 				 errmsg("ON COMMIT can only be used on temporary tables")));
@@ -613,17 +634,6 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 		RangeVarGetAndCheckCreationNamespace(stmt->relation, NoLock, NULL);
 
 	/*
-	 * Security check: disallow creating temp tables from security-restricted
-	 * code.  This is needed because calling code might not expect untrusted
-	 * tables to appear in pg_temp at the front of its search path.
-	 */
-	if (stmt->relation->relpersistence == RELPERSISTENCE_TEMP
-		&& InSecurityRestrictedOperation())
-		ereport(ERROR,
-				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
-				 errmsg("cannot create temporary table within security-restricted operation")));
-
-	/*
 	 * Determine the lockmode to use when scanning parents.  A self-exclusive
 	 * lock is needed here.
 	 *
@@ -718,6 +728,38 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 	/*
 	 * Parse and validate reloptions, if any.
 	 */
+	/* global temp table */
+	has_oncommit_clause = has_oncommit_option(stmt->options);
+	if (stmt->relation->relpersistence == RELPERSISTENCE_SESSION)
+	{
+		if (has_oncommit_clause)
+		{
+			if (stmt->oncommit != ONCOMMIT_NOOP)
+				elog(ERROR, "can not defeine global temp table with on commit and with clause at same time");
+		}
+		else if (stmt->oncommit != ONCOMMIT_NOOP)
+		{
+			DefElem *opt = makeNode(DefElem);
+
+			opt->type = T_DefElem;
+			opt->defnamespace = NULL;
+			opt->defname = "on_commit_delete_rows";
+			opt->defaction = DEFELEM_UNSPEC;
+
+			/* use reloptions to remember on commit clause */
+			if (stmt->oncommit == ONCOMMIT_DELETE_ROWS)
+				opt->arg  = (Node *)makeString("true");
+			else if (stmt->oncommit == ONCOMMIT_PRESERVE_ROWS)
+				opt->arg  = (Node *)makeString("false");
+			else
+				elog(ERROR, "global temp table not support on commit drop clause");
+
+			stmt->options = lappend(stmt->options, opt);
+		}
+	}
+	else if (has_oncommit_clause)
+		elog(ERROR, "regular table cannot specifie on_commit_delete_rows");
+
 	reloptions = transformRelOptions((Datum) 0, stmt->options, NULL, validnsps,
 									 true, false);
 
@@ -1772,7 +1814,8 @@ ExecuteTruncateGuts(List *explicit_rels, List *relids, List *relids_logged,
 		 * table or the current physical file to be thrown away anyway.
 		 */
 		if (rel->rd_createSubid == mySubid ||
-			rel->rd_newRelfilenodeSubid == mySubid)
+			rel->rd_newRelfilenodeSubid == mySubid ||
+			rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
 		{
 			/* Immediate, non-rollbackable truncation is OK */
 			heap_truncate_one_rel(rel);
@@ -3449,6 +3492,26 @@ AlterTableLookupRelation(AlterTableStmt *stmt, LOCKMODE lockmode)
 									(void *) stmt);
 }
 
+
+static bool
+CheckGlobalTempTableNotInUse(Relation rel)
+{
+	int id;
+	for (id = 1; id <= MaxBackends; id++)
+	{
+		if (id != MyBackendId)
+		{
+			struct stat fst;
+			char* path = relpathbackend(rel->rd_node, id, MAIN_FORKNUM);
+			int rc = stat(path, &fst);
+			pfree(path);
+			if (rc == 0 && fst.st_size != 0)
+				return false;
+		}
+	}
+	return true;
+}
+
 /*
  * AlterTable
  *		Execute ALTER TABLE, which can be a list of subcommands
@@ -3500,6 +3563,9 @@ AlterTable(Oid relid, LOCKMODE lockmode, AlterTableStmt *stmt)
 	rel = relation_open(relid, NoLock);
 
 	CheckTableNotInUse(rel, "ALTER TABLE");
+	if (rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION
+		&& !CheckGlobalTempTableNotInUse(rel))
+		elog(ERROR, "Global temp table used by active backends can not be altered");
 
 	ATController(stmt, rel, stmt->cmds, stmt->relation->inh, lockmode);
 }
@@ -7708,6 +7774,12 @@ ATAddForeignKeyConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
 						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 						 errmsg("constraints on unlogged tables may reference only permanent or unlogged tables")));
 			break;
+		case RELPERSISTENCE_SESSION:
+			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
+				ereport(ERROR,
+						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+						 errmsg("constraints on session tables may reference only session tables")));
+			break;
 		case RELPERSISTENCE_TEMP:
 			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_TEMP)
 				ereport(ERROR,
@@ -14140,6 +14212,13 @@ ATPrepChangePersistence(Relation rel, bool toLogged)
 							RelationGetRelationName(rel)),
 					 errtable(rel)));
 			break;
+		case RELPERSISTENCE_SESSION:
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+					 errmsg("cannot change logged status of session table \"%s\"",
+							RelationGetRelationName(rel)),
+					 errtable(rel)));
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			if (toLogged)
 				/* nothing to do */
@@ -14627,14 +14706,7 @@ PreCommit_on_commit_actions(void)
 				/* Do nothing (there shouldn't be such entries, actually) */
 				break;
 			case ONCOMMIT_DELETE_ROWS:
-
-				/*
-				 * If this transaction hasn't accessed any temporary
-				 * relations, we can skip truncating ON COMMIT DELETE ROWS
-				 * tables, as they must still be empty.
-				 */
-				if ((MyXactFlags & XACT_FLAGS_ACCESSEDTEMPNAMESPACE))
-					oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
+				oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
 				break;
 			case ONCOMMIT_DROP:
 				oids_to_drop = lappend_oid(oids_to_drop, oc->relid);
diff --git a/src/backend/optimizer/path/allpaths.c b/src/backend/optimizer/path/allpaths.c
index db3a68a..60212b0 100644
--- a/src/backend/optimizer/path/allpaths.c
+++ b/src/backend/optimizer/path/allpaths.c
@@ -48,6 +48,7 @@
 #include "partitioning/partprune.h"
 #include "rewrite/rewriteManip.h"
 #include "utils/lsyscache.h"
+#include "utils/rel.h"
 
 
 /* results of subquery_is_pushdown_safe */
@@ -618,7 +619,7 @@ set_rel_consider_parallel(PlannerInfo *root, RelOptInfo *rel,
 			 * the rest of the necessary infrastructure right now anyway.  So
 			 * for now, bail out if we see a temporary table.
 			 */
-			if (get_rel_persistence(rte->relid) == RELPERSISTENCE_TEMP)
+			if (IsLocalRelpersistence(get_rel_persistence(rte->relid)))
 				return;
 
 			/*
diff --git a/src/backend/optimizer/plan/planner.c b/src/backend/optimizer/plan/planner.c
index 17c5f08..7c83e7b 100644
--- a/src/backend/optimizer/plan/planner.c
+++ b/src/backend/optimizer/plan/planner.c
@@ -6307,7 +6307,7 @@ plan_create_index_workers(Oid tableOid, Oid indexOid)
 	 * Furthermore, any index predicate or index expressions must be parallel
 	 * safe.
 	 */
-	if (heap->rd_rel->relpersistence == RELPERSISTENCE_TEMP ||
+	if (RelationHasSessionScope(heap) ||
 		!is_parallel_safe(root, (Node *) RelationGetIndexExpressions(index)) ||
 		!is_parallel_safe(root, (Node *) RelationGetIndexPredicate(index)))
 	{
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index 3f67aaf..565c868 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -3266,20 +3266,11 @@ OptTemp:	TEMPORARY					{ $$ = RELPERSISTENCE_TEMP; }
 			| TEMP						{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMPORARY			{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMP				{ $$ = RELPERSISTENCE_TEMP; }
-			| GLOBAL TEMPORARY
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
-			| GLOBAL TEMP
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
+			| GLOBAL TEMPORARY          { $$ = RELPERSISTENCE_SESSION; }
+			| GLOBAL TEMP               { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION                   { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMPORARY         { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMP              { $$ = RELPERSISTENCE_SESSION; }
 			| UNLOGGED					{ $$ = RELPERSISTENCE_UNLOGGED; }
 			| /*EMPTY*/					{ $$ = RELPERSISTENCE_PERMANENT; }
 		;
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index ee47547..ea7fe4c 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -437,6 +437,14 @@ generateSerialExtraStmts(CreateStmtContext *cxt, ColumnDef *column,
 	seqstmt->options = seqoptions;
 
 	/*
+	 * Why we should not always use persistence of parent table?
+	 * Although it is prohibited to have unlogged sequences,
+	 * unlogged tables with SERIAL fields are accepted!
+	 */
+	if (cxt->relation->relpersistence != RELPERSISTENCE_UNLOGGED)
+		seqstmt->sequence->relpersistence = cxt->relation->relpersistence;
+
+	/*
 	 * If a sequence data type was specified, add it to the options.  Prepend
 	 * to the list rather than append; in case a user supplied their own AS
 	 * clause, the "redundant options" error will point to their occurrence,
diff --git a/src/backend/postmaster/autovacuum.c b/src/backend/postmaster/autovacuum.c
index c1dd816..dcfc134 100644
--- a/src/backend/postmaster/autovacuum.c
+++ b/src/backend/postmaster/autovacuum.c
@@ -2157,7 +2157,7 @@ do_autovacuum(void)
 		/*
 		 * We cannot safely process other backends' temp tables, so skip 'em.
 		 */
-		if (classForm->relpersistence == RELPERSISTENCE_TEMP)
+		if (IsLocalRelpersistence(classForm->relpersistence))
 			continue;
 
 		relid = classForm->oid;
diff --git a/src/backend/storage/buffer/bufmgr.c b/src/backend/storage/buffer/bufmgr.c
index 483f705..1129dc3 100644
--- a/src/backend/storage/buffer/bufmgr.c
+++ b/src/backend/storage/buffer/bufmgr.c
@@ -2933,7 +2933,7 @@ DropRelFileNodeBuffers(RelFileNodeBackend rnode, ForkNumber *forkNum,
 	/* If it's a local relation, it's localbuf.c's problem. */
 	if (RelFileNodeBackendIsTemp(rnode))
 	{
-		if (rnode.backend == MyBackendId)
+		if (GetRelationBackendId(rnode.backend) == MyBackendId)
 		{
 			for (j = 0; j < nforks; j++)
 				DropRelFileNodeLocalBuffers(rnode.node, forkNum[j],
diff --git a/src/backend/storage/smgr/md.c b/src/backend/storage/smgr/md.c
index 07f3c93..8cf06f6 100644
--- a/src/backend/storage/smgr/md.c
+++ b/src/backend/storage/smgr/md.c
@@ -28,17 +28,20 @@
 #include "miscadmin.h"
 #include "access/xlogutils.h"
 #include "access/xlog.h"
+#include "commands/tablecmds.h"
 #include "commands/tablespace.h"
 #include "pgstat.h"
 #include "postmaster/bgwriter.h"
 #include "storage/fd.h"
 #include "storage/bufmgr.h"
+#include "storage/ipc.h"
 #include "storage/md.h"
 #include "storage/relfilenode.h"
 #include "storage/smgr.h"
 #include "storage/sync.h"
 #include "utils/hsearch.h"
 #include "utils/memutils.h"
+#include "utils/rel.h"
 #include "pg_trace.h"
 
 /*
@@ -87,6 +90,19 @@ typedef struct _MdfdVec
 
 static MemoryContext MdCxt;		/* context for all MdfdVec objects */
 
+/*
+ * Structure used to collect information created by this backend.
+ * Data of this related should be deleted on backend exit.
+ */
+typedef struct SessionRelation
+{
+	RelFileNodeBackend rnode;
+	ForkNumber forknum;
+	struct SessionRelation* next;
+} SessionRelation;
+
+
+static SessionRelation* SessionRelations;
 
 /* Populate a file tag describing an md.c segment file. */
 #define INIT_MD_FILETAG(a,xx_rnode,xx_forknum,xx_segno) \
@@ -152,6 +168,60 @@ mdinit(void)
 								  ALLOCSET_DEFAULT_SIZES);
 }
 
+
+/*
+ * Delete all data of session relations and remove their pages from shared buffers.
+ * This function is called on backend exit.
+ */
+static void
+TruncateSessionRelations(int code, Datum arg)
+{
+	SessionRelation* rel;
+	for (rel = SessionRelations; rel != NULL; rel = rel->next)
+	{
+		/* Delete relation files */
+		mdunlink(rel->rnode, rel->forknum, false);
+	}
+}
+
+/*
+ * Maintain information about session relations accessed by this backend.
+ * This list is needed to perform cleanup on backend exit.
+ * Session relation is linked in this list when this relation is created or opened and file doesn't exist.
+ * Such procedure guarantee that each relation is linked into list only once.
+ */
+static void
+RegisterSessionRelation(SMgrRelation reln, ForkNumber forknum)
+{
+	SessionRelation* rel = (SessionRelation*)MemoryContextAlloc(TopMemoryContext, sizeof(SessionRelation));
+
+	/*
+	 * Perform session relation cleanup on backend exit. We are using shared memory hook, because
+	 * cleanup should be performed before backend is disconnected from shared memory.
+	 */
+	if (SessionRelations == NULL)
+		on_shmem_exit(TruncateSessionRelations, 0);
+
+	rel->rnode = reln->smgr_rnode;
+	rel->forknum = forknum;
+	rel->next = SessionRelations;
+	SessionRelations = rel;
+}
+
+static void
+RegisterOnCommitAction(SMgrRelation reln, ForkNumber forknum)
+{
+	if (reln->smgr_owner && forknum == MAIN_FORKNUM)
+	{
+		Relation rel = (Relation)((char*)reln->smgr_owner - offsetof(RelationData, rd_smgr));
+		if (rel->rd_options
+			&& ((StdRdOptions *)rel->rd_options)->on_commit_delete_rows)
+		{
+			register_on_commit_action(rel->rd_id, ONCOMMIT_DELETE_ROWS);
+		}
+	}
+}
+
 /*
  *	mdexists() -- Does the physical file exist?
  *
@@ -218,6 +288,8 @@ mdcreate(SMgrRelation reln, ForkNumber forkNum, bool isRedo)
 					 errmsg("could not create file \"%s\": %m", path)));
 		}
 	}
+	if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		RegisterSessionRelation(reln, forkNum);
 
 	pfree(path);
 
@@ -465,6 +537,21 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 
 	if (fd < 0)
 	{
+		/*
+		 * In case of session relation access, there may be no yet files of this relation for this backend.
+		 * If so, then create file and register session relation for truncation on backend exit.
+		 */
+		if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
+			fd = PathNameOpenFile(path, O_RDWR | PG_BINARY | O_CREAT);
+			if (fd >= 0)
+			{
+				RegisterSessionRelation(reln, forknum);
+				if (!(behavior & EXTENSION_RETURN_NULL))
+					RegisterOnCommitAction(reln, forknum);
+				goto NewSegment;
+			}
+		}
 		if ((behavior & EXTENSION_RETURN_NULL) &&
 			FILE_POSSIBLY_DELETED(errno))
 		{
@@ -476,6 +563,7 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 				 errmsg("could not open file \"%s\": %m", path)));
 	}
 
+  NewSegment:
 	pfree(path);
 
 	_fdvec_resize(reln, forknum, 1);
@@ -652,8 +740,13 @@ mdread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
 		 * complaining.  This allows, for example, the case of trying to
 		 * update a block that was later truncated away.
 		 */
-		if (zero_damaged_pages || InRecovery)
+		if (zero_damaged_pages || InRecovery || RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
 			MemSet(buffer, 0, BLCKSZ);
+			/* In case of session relation we need to write zero page to provide correct result of subsequent mdnblocks */
+			if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+				mdwrite(reln, forknum, blocknum, buffer, true);
+		}
 		else
 			ereport(ERROR,
 					(errcode(ERRCODE_DATA_CORRUPTED),
@@ -743,7 +836,8 @@ mdnblocks(SMgrRelation reln, ForkNumber forknum)
 	BlockNumber segno = 0;
 
 	/* mdopen has opened the first segment */
-	Assert(reln->md_num_open_segs[forknum] > 0);
+	if (reln->md_num_open_segs[forknum] == 0)
+		return 0;
 
 	/*
 	 * Start from the last open segments, to avoid redundant seeks.  We have
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index a87e721..2401361 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -994,6 +994,9 @@ pg_relation_filepath(PG_FUNCTION_ARGS)
 	/* Determine owning backend. */
 	switch (relform->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/utils/cache/catcache.c b/src/backend/utils/cache/catcache.c
index c3e7d94..6d86c28 100644
--- a/src/backend/utils/cache/catcache.c
+++ b/src/backend/utils/cache/catcache.c
@@ -1191,6 +1191,111 @@ SearchCatCache4(CatCache *cache,
 	return SearchCatCacheInternal(cache, 4, v1, v2, v3, v4);
 }
 
+
+void InsertCatCache(CatCache *cache,
+					Datum v1, Datum v2, Datum v3, Datum v4,
+					HeapTuple tuple)
+{
+	Datum		arguments[CATCACHE_MAXKEYS];
+	uint32		hashValue;
+	Index		hashIndex;
+	CatCTup    *ct;
+	dlist_iter	iter;
+	dlist_head *bucket;
+	int         nkeys = cache->cc_nkeys;
+	MemoryContext oldcxt;
+	int         i;
+
+	/*
+	 * one-time startup overhead for each cache
+	 */
+	if (unlikely(cache->cc_tupdesc == NULL))
+		CatalogCacheInitializeCache(cache);
+
+	/* Initialize local parameter array */
+	arguments[0] = v1;
+	arguments[1] = v2;
+	arguments[2] = v3;
+	arguments[3] = v4;
+	/*
+	 * find the hash bucket in which to look for the tuple
+	 */
+	hashValue = CatalogCacheComputeHashValue(cache, nkeys, v1, v2, v3, v4);
+	hashIndex = HASH_INDEX(hashValue, cache->cc_nbuckets);
+
+	/*
+	 * scan the hash bucket until we find a match or exhaust our tuples
+	 *
+	 * Note: it's okay to use dlist_foreach here, even though we modify the
+	 * dlist within the loop, because we don't continue the loop afterwards.
+	 */
+	bucket = &cache->cc_bucket[hashIndex];
+	dlist_foreach(iter, bucket)
+	{
+		ct = dlist_container(CatCTup, cache_elem, iter.cur);
+
+		if (ct->dead)
+			continue;			/* ignore dead entries */
+
+		if (ct->hash_value != hashValue)
+			continue;			/* quickly skip entry if wrong hash val */
+
+		if (!CatalogCacheCompareTuple(cache, nkeys, ct->keys, arguments))
+			continue;
+
+		/*
+		 * If it's a positive entry, bump its refcount and return it. If it's
+		 * negative, we can report failure to the caller.
+		 */
+		if (ct->tuple.t_len == tuple->t_len)
+		{
+			memcpy((char *) ct->tuple.t_data,
+				   (const char *) tuple->t_data,
+				   tuple->t_len);
+			return;
+		}
+		dlist_delete(&ct->cache_elem);
+		pfree(ct);
+		cache->cc_ntup -= 1;
+		CacheHdr->ch_ntup -= 1;
+		break;
+	}
+	/* Allocate memory for CatCTup and the cached tuple in one go */
+	oldcxt = MemoryContextSwitchTo(CacheMemoryContext);
+
+	ct = (CatCTup *) palloc(sizeof(CatCTup) +
+							MAXIMUM_ALIGNOF + tuple->t_len);
+	ct->tuple.t_len = tuple->t_len;
+	ct->tuple.t_self = tuple->t_self;
+	ct->tuple.t_tableOid = tuple->t_tableOid;
+	ct->tuple.t_data = (HeapTupleHeader)
+		MAXALIGN(((char *) ct) + sizeof(CatCTup));
+	/* copy tuple contents */
+	memcpy((char *) ct->tuple.t_data,
+		   (const char *) tuple->t_data,
+		   tuple->t_len);
+	ct->ct_magic = CT_MAGIC;
+	ct->my_cache = cache;
+	ct->c_list = NULL;
+	ct->refcount = 1;			/* pinned*/
+	ct->dead = false;
+	ct->negative = false;
+	ct->hash_value = hashValue;
+	dlist_push_head(&cache->cc_bucket[hashIndex], &ct->cache_elem);
+	memcpy(ct->keys, arguments, nkeys*sizeof(Datum));
+
+	cache->cc_ntup++;
+	CacheHdr->ch_ntup++;
+	MemoryContextSwitchTo(oldcxt);
+
+	/*
+	 * If the hash table has become too full, enlarge the buckets array. Quite
+	 * arbitrarily, we enlarge when fill factor > 2.
+	 */
+	if (cache->cc_ntup > cache->cc_nbuckets * 2)
+		RehashCatCache(cache);
+}
+
 /*
  * Work-horse for SearchCatCache/SearchCatCacheN.
  */
diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c
index 585dcee..ce8852c 100644
--- a/src/backend/utils/cache/relcache.c
+++ b/src/backend/utils/cache/relcache.c
@@ -1098,6 +1098,10 @@ RelationBuildDesc(Oid targetRelId, bool insertIt)
 	relation->rd_newRelfilenodeSubid = InvalidSubTransactionId;
 	switch (relation->rd_rel->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			relation->rd_backend = BackendIdForSessionRelations();
+			relation->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			relation->rd_backend = InvalidBackendId;
@@ -3301,6 +3305,10 @@ RelationBuildLocalRelation(const char *relname,
 	rel->rd_rel->relpersistence = relpersistence;
 	switch (relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			rel->rd_backend = BackendIdForSessionRelations();
+			rel->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			rel->rd_backend = InvalidBackendId;
diff --git a/src/backend/utils/cache/syscache.c b/src/backend/utils/cache/syscache.c
index 16297a5..e7a4d3c 100644
--- a/src/backend/utils/cache/syscache.c
+++ b/src/backend/utils/cache/syscache.c
@@ -1164,6 +1164,16 @@ SearchSysCache4(int cacheId,
 	return SearchCatCache4(SysCache[cacheId], key1, key2, key3, key4);
 }
 
+void
+InsertSysCache(int cacheId,
+			   Datum key1, Datum key2, Datum key3, Datum key4,
+			   HeapTuple value)
+{
+	Assert(cacheId >= 0 && cacheId < SysCacheSize &&
+		   PointerIsValid(SysCache[cacheId]));
+	InsertCatCache(SysCache[cacheId], key1, key2, key3, key4, value);
+}
+
 /*
  * ReleaseSysCache
  *		Release previously grabbed reference count on a tuple
diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
index bf69adc..fa7479c 100644
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -15637,8 +15637,8 @@ dumpTableSchema(Archive *fout, TableInfo *tbinfo)
 											 tbinfo->dobj.catId.oid, false);
 
 		appendPQExpBuffer(q, "CREATE %s%s %s",
-						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ?
-						  "UNLOGGED " : "",
+						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ? "UNLOGGED "
+						  : tbinfo->relpersistence == RELPERSISTENCE_SESSION ? "SESSION " : "",
 						  reltypename,
 						  qualrelname);
 
diff --git a/src/common/relpath.c b/src/common/relpath.c
index 62b9553..cef99d2 100644
--- a/src/common/relpath.c
+++ b/src/common/relpath.c
@@ -166,7 +166,18 @@ GetRelationPath(Oid dbNode, Oid spcNode, Oid relNode,
 		}
 		else
 		{
-			if (forkNumber != MAIN_FORKNUM)
+			/*
+			 * Session relations are distinguished from local temp relations by adding
+			 * SessionRelFirstBackendId offset to backendId.
+			 * These is no need to separate them at file system level, so just subtract SessionRelFirstBackendId
+			 * to avoid too long file names.
+			 * Segments of session relations have the same prefix (t%d_) as local temporary relations
+			 * to make it possible to cleanup them in the same way as local temporary relation files.
+			 */
+			 if (backendId >= SessionRelFirstBackendId)
+				 backendId -= SessionRelFirstBackendId;
+
+			 if (forkNumber != MAIN_FORKNUM)
 				path = psprintf("base/%u/t%d_%u_%s",
 								dbNode, backendId, relNode,
 								forkNames[forkNumber]);
diff --git a/src/include/catalog/pg_class.h b/src/include/catalog/pg_class.h
index 090b6ba..6a39663 100644
--- a/src/include/catalog/pg_class.h
+++ b/src/include/catalog/pg_class.h
@@ -165,6 +165,7 @@ typedef FormData_pg_class *Form_pg_class;
 #define		  RELPERSISTENCE_PERMANENT	'p' /* regular table */
 #define		  RELPERSISTENCE_UNLOGGED	'u' /* unlogged permanent table */
 #define		  RELPERSISTENCE_TEMP		't' /* temporary table */
+#define		  RELPERSISTENCE_SESSION	's' /* session table */
 
 /* default selection for replica identity (primary key or nothing) */
 #define		  REPLICA_IDENTITY_DEFAULT	'd'
diff --git a/src/include/storage/backendid.h b/src/include/storage/backendid.h
index 70ef8eb..11b4b89 100644
--- a/src/include/storage/backendid.h
+++ b/src/include/storage/backendid.h
@@ -22,6 +22,13 @@ typedef int BackendId;			/* unique currently active backend identifier */
 
 #define InvalidBackendId		(-1)
 
+/*
+ * We need to distinguish local and global temporary relations by RelFileNodeBackend.
+ * The least invasive change is to add some special bias value to backend id (since 
+ * maximal number of backed is limited by MaxBackends).
+ */
+#define SessionRelFirstBackendId (0x40000000)
+
 extern PGDLLIMPORT BackendId MyBackendId;	/* backend id of this backend */
 
 /* backend id of our parallel session leader, or InvalidBackendId if none */
@@ -34,4 +41,12 @@ extern PGDLLIMPORT BackendId ParallelMasterBackendId;
 #define BackendIdForTempRelations() \
 	(ParallelMasterBackendId == InvalidBackendId ? MyBackendId : ParallelMasterBackendId)
 
+
+#define BackendIdForSessionRelations() \
+	(BackendIdForTempRelations() + SessionRelFirstBackendId)
+
+#define IsSessionRelationBackendId(id) ((id) >= SessionRelFirstBackendId)
+
+#define GetRelationBackendId(id) ((id) & ~SessionRelFirstBackendId)
+
 #endif							/* BACKENDID_H */
diff --git a/src/include/storage/bufpage.h b/src/include/storage/bufpage.h
index 4ef6d8d..bac7a31 100644
--- a/src/include/storage/bufpage.h
+++ b/src/include/storage/bufpage.h
@@ -229,6 +229,13 @@ typedef PageHeaderData *PageHeader;
 #define PageIsNew(page) (((PageHeader) (page))->pd_upper == 0)
 
 /*
+ * Page of temporary relation is not initialized
+ */
+#define GlobalTempRelationPageIsNotInitialized(rel, page) \
+	((rel)->rd_rel->relpersistence == RELPERSISTENCE_SESSION && PageIsNew(page))
+
+
+/*
  * PageGetItemId
  *		Returns an item identifier of a page.
  */
diff --git a/src/include/storage/relfilenode.h b/src/include/storage/relfilenode.h
index 586500a..20aec72 100644
--- a/src/include/storage/relfilenode.h
+++ b/src/include/storage/relfilenode.h
@@ -75,10 +75,25 @@ typedef struct RelFileNodeBackend
 	BackendId	backend;
 } RelFileNodeBackend;
 
+/*
+ * Check whether it is local or global temporary relation, which data belongs only to one backend.
+ */
 #define RelFileNodeBackendIsTemp(rnode) \
 	((rnode).backend != InvalidBackendId)
 
 /*
+ * Check whether it is global temporary relation which metadata is shared by all sessions,
+ * but data is private for the current session.
+ */
+#define RelFileNodeBackendIsGlobalTemp(rnode) IsSessionRelationBackendId((rnode).backend)
+
+/*
+ * Check whether it is local temporary relation which exists only in this backend.
+ */
+#define RelFileNodeBackendIsLocalTemp(rnode) \
+	(RelFileNodeBackendIsTemp(rnode) && !RelFileNodeBackendIsGlobalTemp(rnode))
+
+/*
  * Note: RelFileNodeEquals and RelFileNodeBackendEquals compare relNode first
  * since that is most likely to be different in two unequal RelFileNodes.  It
  * is probably redundant to compare spcNode if the other fields are found equal,
diff --git a/src/include/utils/catcache.h b/src/include/utils/catcache.h
index ff1faba..31f615d 100644
--- a/src/include/utils/catcache.h
+++ b/src/include/utils/catcache.h
@@ -228,4 +228,8 @@ extern void PrepareToInvalidateCacheTuple(Relation relation,
 extern void PrintCatCacheLeakWarning(HeapTuple tuple);
 extern void PrintCatCacheListLeakWarning(CatCList *list);
 
+extern void InsertCatCache(CatCache *cache,
+						   Datum v1, Datum v2, Datum v3, Datum v4,
+						   HeapTuple tuple);
+
 #endif							/* CATCACHE_H */
diff --git a/src/include/utils/rel.h b/src/include/utils/rel.h
index a5cf804..a30137f 100644
--- a/src/include/utils/rel.h
+++ b/src/include/utils/rel.h
@@ -272,6 +272,7 @@ typedef struct StdRdOptions
 	int			parallel_workers;	/* max number of parallel workers */
 	bool		vacuum_index_cleanup;	/* enables index vacuuming and cleanup */
 	bool		vacuum_truncate;	/* enables vacuum to truncate a relation */
+	bool		on_commit_delete_rows;	/* global temp table */
 } StdRdOptions;
 
 #define HEAP_MIN_FILLFACTOR			10
@@ -327,6 +328,18 @@ typedef struct StdRdOptions
 	((relation)->rd_options ? \
 	 ((StdRdOptions *) (relation)->rd_options)->parallel_workers : (defaultpw))
 
+/*
+ * Relation persistence is either TEMP either SESSION
+ */
+#define IsLocalRelpersistence(relpersistence) \
+	((relpersistence) == RELPERSISTENCE_TEMP || (relpersistence) == RELPERSISTENCE_SESSION)
+
+/*
+ * Relation is either global either local temp table
+ */
+#define RelationHasSessionScope(relation) \
+	IsLocalRelpersistence(((relation)->rd_rel->relpersistence))
+
 /* ViewOptions->check_option values */
 typedef enum ViewOptCheckOption
 {
@@ -335,6 +348,7 @@ typedef enum ViewOptCheckOption
 	VIEW_OPTION_CHECK_OPTION_CASCADED
 } ViewOptCheckOption;
 
+
 /*
  * ViewOptions
  *		Contents of rd_options for views
@@ -526,7 +540,7 @@ typedef struct ViewOptions
  *		True if relation's pages are stored in local buffers.
  */
 #define RelationUsesLocalBuffers(relation) \
-	((relation)->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
+	RelationHasSessionScope(relation)
 
 /*
  * RELATION_IS_LOCAL
diff --git a/src/include/utils/syscache.h b/src/include/utils/syscache.h
index 918765c..5b1598b 100644
--- a/src/include/utils/syscache.h
+++ b/src/include/utils/syscache.h
@@ -216,4 +216,8 @@ extern bool RelationSupportsSysCache(Oid relid);
 
 #define ReleaseSysCacheList(x)	ReleaseCatCacheList(x)
 
+
+extern void InsertSysCache(int cacheId, 
+						   Datum v1, Datum v2, Datum v3, Datum v4,
+						   HeapTuple tuple);
 #endif							/* SYSCACHE_H */
diff --git a/src/test/isolation/expected/inherit-global-temp.out b/src/test/isolation/expected/inherit-global-temp.out
new file mode 100644
index 0000000..6114f8c
--- /dev/null
+++ b/src/test/isolation/expected/inherit-global-temp.out
@@ -0,0 +1,218 @@
+Parsed test spec with 2 sessions
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_update_p s1_update_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_update_p: UPDATE inh_global_parent SET a = 11 WHERE a = 1;
+step s1_update_c: UPDATE inh_global_parent SET a = 13 WHERE a IN (3, 5);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+2              
+11             
+4              
+13             
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+4              
+13             
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+2              
+11             
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_update_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_update_c: UPDATE inh_global_parent SET a = 15 WHERE a IN (3, 5);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+6              
+15             
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+6              
+15             
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_delete_p s1_delete_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_delete_p: DELETE FROM inh_global_parent WHERE a = 2;
+step s1_delete_c: DELETE FROM inh_global_parent WHERE a IN (4, 6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+3              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_delete_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_delete_c: DELETE FROM inh_global_parent WHERE a IN (4, 6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+5              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_truncate_p s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_truncate_p s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_truncate_p: TRUNCATE inh_global_parent;
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_begin s1_truncate_p s2_select_p s1_commit
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_begin: BEGIN;
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s2_select_p: SELECT a FROM inh_global_parent; <waiting ...>
+step s1_commit: COMMIT;
+step s2_select_p: <... completed>
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_begin s1_truncate_p s2_select_c s1_commit
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_begin: BEGIN;
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2; <waiting ...>
+step s1_commit: COMMIT;
+step s2_select_c: <... completed>
+a              
+
+5              
+6              
diff --git a/src/test/isolation/isolation_schedule b/src/test/isolation/isolation_schedule
index a2fa192..ef7aa85 100644
--- a/src/test/isolation/isolation_schedule
+++ b/src/test/isolation/isolation_schedule
@@ -88,3 +88,4 @@ test: plpgsql-toast
 test: truncate-conflict
 test: serializable-parallel
 test: serializable-parallel-2
+test: inherit-global-temp
diff --git a/src/test/isolation/specs/inherit-global-temp.spec b/src/test/isolation/specs/inherit-global-temp.spec
new file mode 100644
index 0000000..5e95dd6
--- /dev/null
+++ b/src/test/isolation/specs/inherit-global-temp.spec
@@ -0,0 +1,73 @@
+# This is a copy of the inherit-temp test with little changes for global temporary tables.
+#
+
+setup
+{
+  CREATE TABLE inh_global_parent (a int);
+}
+
+teardown
+{
+  DROP TABLE inh_global_parent;
+}
+
+# Session 1 executes actions which act directly on both the parent and
+# its child.  Abbreviation "c" is used for queries working on the child
+# and "p" on the parent.
+session "s1"
+setup
+{
+  CREATE GLOBAL TEMPORARY TABLE inh_global_temp_child_s1 () INHERITS (inh_global_parent);
+}
+step "s1_begin" { BEGIN; }
+step "s1_truncate_p" { TRUNCATE inh_global_parent; }
+step "s1_select_p" { SELECT a FROM inh_global_parent; }
+step "s1_select_c" { SELECT a FROM inh_global_temp_child_s1; }
+step "s1_insert_p" { INSERT INTO inh_global_parent VALUES (1), (2); }
+step "s1_insert_c" { INSERT INTO inh_global_temp_child_s1 VALUES (3), (4); }
+step "s1_update_p" { UPDATE inh_global_parent SET a = 11 WHERE a = 1; }
+step "s1_update_c" { UPDATE inh_global_parent SET a = 13 WHERE a IN (3, 5); }
+step "s1_delete_p" { DELETE FROM inh_global_parent WHERE a = 2; }
+step "s1_delete_c" { DELETE FROM inh_global_parent WHERE a IN (4, 6); }
+step "s1_commit" { COMMIT; }
+teardown
+{
+  DROP TABLE inh_global_temp_child_s1;
+}
+
+# Session 2 executes actions on the parent which act only on the child.
+session "s2"
+setup
+{
+  CREATE GLOBAL TEMPORARY TABLE inh_global_temp_child_s2 () INHERITS (inh_global_parent);
+}
+step "s2_truncate_p" { TRUNCATE inh_global_parent; }
+step "s2_select_p" { SELECT a FROM inh_global_parent; }
+step "s2_select_c" { SELECT a FROM inh_global_temp_child_s2; }
+step "s2_insert_c" { INSERT INTO inh_global_temp_child_s2 VALUES (5), (6); }
+step "s2_update_c" { UPDATE inh_global_parent SET a = 15 WHERE a IN (3, 5); }
+step "s2_delete_c" { DELETE FROM inh_global_parent WHERE a IN (4, 6); }
+teardown
+{
+  DROP TABLE inh_global_temp_child_s2;
+}
+
+# Check INSERT behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check UPDATE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_update_p" "s1_update_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_update_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check DELETE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_delete_p" "s1_delete_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_delete_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check TRUNCATE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_truncate_p" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_truncate_p" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# TRUNCATE on a parent tree does not block access to temporary child relation
+# of another session, and blocks when scanning the parent.
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_begin" "s1_truncate_p" "s2_select_p" "s1_commit"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_begin" "s1_truncate_p" "s2_select_c" "s1_commit"
diff --git a/src/test/regress/expected/global_temp.out b/src/test/regress/expected/global_temp.out
new file mode 100644
index 0000000..ae1adb6
--- /dev/null
+++ b/src/test/regress/expected/global_temp.out
@@ -0,0 +1,247 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+-- Test ON COMMIT DELETE ROWS
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+   2
+(2 rows)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+(1 row)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+ col 
+-----
+   1
+(1 row)
+
+SELECT * FROM global_temptest2;
+ col 
+-----
+(0 rows)
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+ERROR:  unsupported ON COMMIT and foreign key combination
+DETAIL:  Table "global_temptest4" references "global_temptest3", but they do not have the same ON COMMIT setting.
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+ a 
+---
+(0 rows)
+
+DROP TABLE temp_parted_oncommit;
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+              relname              
+-----------------------------------
+ global_temp_parted_oncommit_test
+ global_temp_parted_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_parted_oncommit_test;
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+            relname             
+--------------------------------
+ global_temp_inh_oncommit_test
+ global_temp_inh_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ERROR:  cannot inherit from temporary relation "global_temp_table"
+ROLLBACK;
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM global_temp_table;
+ a 
+---
+ 1
+(1 row)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+(2 rows)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       1
+(1 row)
+
+\c
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+(0 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       2
+(1 row)
+
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       3
+(1 row)
+
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
diff --git a/src/test/regress/expected/session_table.out b/src/test/regress/expected/session_table.out
new file mode 100644
index 0000000..1b9b3f4
--- /dev/null
+++ b/src/test/regress/expected/session_table.out
@@ -0,0 +1,64 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+ count 
+-------
+ 10000
+(1 row)
+
+\c
+select count(*) from my_private_table;
+ count 
+-------
+     0
+(1 row)
+
+select * from my_private_table where x=10001;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select * from my_private_table where y=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select count(*) from my_private_table;
+ count  
+--------
+ 100000
+(1 row)
+
+\c
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+   x    |   y    
+--------+--------
+ 100000 | 100000
+(1 row)
+
+drop table  my_private_table;
diff --git a/src/test/regress/parallel_schedule b/src/test/regress/parallel_schedule
index fc0f141..507cf7d 100644
--- a/src/test/regress/parallel_schedule
+++ b/src/test/regress/parallel_schedule
@@ -107,7 +107,7 @@ test: json jsonb json_encoding jsonpath jsonpath_encoding jsonb_jsonpath
 # NB: temp.sql does a reconnect which transiently uses 2 connections,
 # so keep this parallel group to at most 19 tests
 # ----------
-test: plancache limit plpgsql copy2 temp domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
+test: plancache limit plpgsql copy2 temp global_temp session_table domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
 
 # ----------
 # Another group of parallel tests
diff --git a/src/test/regress/serial_schedule b/src/test/regress/serial_schedule
index 68ac56a..3890777 100644
--- a/src/test/regress/serial_schedule
+++ b/src/test/regress/serial_schedule
@@ -172,6 +172,8 @@ test: limit
 test: plpgsql
 test: copy2
 test: temp
+test: global_temp
+test: session_table
 test: domain
 test: rangefuncs
 test: prepare
diff --git a/src/test/regress/sql/global_temp.sql b/src/test/regress/sql/global_temp.sql
new file mode 100644
index 0000000..3058b9b
--- /dev/null
+++ b/src/test/regress/sql/global_temp.sql
@@ -0,0 +1,151 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+
+-- Test ON COMMIT DELETE ROWS
+
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+SELECT * FROM global_temptest2;
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+DROP TABLE temp_parted_oncommit;
+
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+DROP TABLE global_temp_parted_oncommit_test;
+
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ROLLBACK;
+
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+COMMIT;
+SELECT * FROM global_temp_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+COMMIT;
+SELECT * FROM normal_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+\c
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
diff --git a/src/test/regress/sql/session_table.sql b/src/test/regress/sql/session_table.sql
new file mode 100644
index 0000000..c6663dc
--- /dev/null
+++ b/src/test/regress/sql/session_table.sql
@@ -0,0 +1,18 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+\c
+select count(*) from my_private_table;
+select * from my_private_table where x=10001;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+select * from my_private_table where y=10001;
+select count(*) from my_private_table;
+\c
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+drop table  my_private_table;

diff --git a/src/backend/access/brin/brin.c b/src/backend/access/brin/brin.c
index ae7b729..485c068 100644
--- a/src/backend/access/brin/brin.c
+++ b/src/backend/access/brin/brin.c
@@ -672,7 +672,7 @@ brinbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	/*
 	 * We expect to be called exactly once for any index relation.
 	 */
-	if (RelationGetNumberOfBlocks(index) != 0)
+	if (RelationGetNumberOfBlocks(index) != 0 && index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
 		elog(ERROR, "index \"%s\" already contains data",
 			 RelationGetRelationName(index));
 
@@ -681,9 +681,17 @@ brinbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	 * whole relation will be rolled back.
 	 */
 
-	meta = ReadBuffer(index, P_NEW);
-	Assert(BufferGetBlockNumber(meta) == BRIN_METAPAGE_BLKNO);
-	LockBuffer(meta, BUFFER_LOCK_EXCLUSIVE);
+	if (index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
+	{
+		meta = ReadBuffer(index, P_NEW);
+		Assert(BufferGetBlockNumber(meta) == BRIN_METAPAGE_BLKNO);
+		LockBuffer(meta, BUFFER_LOCK_EXCLUSIVE);
+	}
+	else
+	{
+		meta = ReadBuffer(index, BRIN_METAPAGE_BLKNO);
+		LockBuffer(meta, BUFFER_LOCK_SHARE);
+	}
 
 	brin_metapage_init(BufferGetPage(meta), BrinGetPagesPerRange(index),
 					   BRIN_CURRENT_VERSION);
diff --git a/src/backend/access/brin/brin_revmap.c b/src/backend/access/brin/brin_revmap.c
index 647350c..d432fec 100644
--- a/src/backend/access/brin/brin_revmap.c
+++ b/src/backend/access/brin/brin_revmap.c
@@ -25,8 +25,10 @@
 #include "access/brin_revmap.h"
 #include "access/brin_tuple.h"
 #include "access/brin_xlog.h"
+#include "access/brin.h"
 #include "access/rmgr.h"
 #include "access/xloginsert.h"
+#include "catalog/index.h"
 #include "miscadmin.h"
 #include "storage/bufmgr.h"
 #include "storage/lmgr.h"
@@ -79,6 +81,13 @@ brinRevmapInitialize(Relation idxrel, BlockNumber *pagesPerRange,
 	meta = ReadBuffer(idxrel, BRIN_METAPAGE_BLKNO);
 	LockBuffer(meta, BUFFER_LOCK_SHARE);
 	page = BufferGetPage(meta);
+
+	if (GlobalTempRelationPageIsNotInitialized(idxrel, page))
+	{
+		Relation heap = RelationIdGetRelation(idxrel->rd_index->indrelid);
+		brinbuild(heap, idxrel, BuildIndexInfo(idxrel));
+		RelationClose(heap);
+	}
 	TestForOldSnapshot(snapshot, idxrel, page);
 	metadata = (BrinMetaPageData *) PageGetContents(page);
 
diff --git a/src/backend/access/common/reloptions.c b/src/backend/access/common/reloptions.c
index b5072c0..650f31a 100644
--- a/src/backend/access/common/reloptions.c
+++ b/src/backend/access/common/reloptions.c
@@ -158,6 +158,19 @@ static relopt_bool boolRelOpts[] =
 		},
 		true
 	},
+	/*
+	 * For global temp table only
+	 * use AccessExclusiveLock for ensure safety
+	 */
+	{
+		{
+			"on_commit_delete_rows",
+			"global temp table on commit options",
+			RELOPT_KIND_HEAP | RELOPT_KIND_PARTITIONED,
+			ShareUpdateExclusiveLock
+		},
+		false
+	},
 	/* list terminator */
 	{{NULL}}
 };
@@ -1478,6 +1491,8 @@ default_reloptions(Datum reloptions, bool validate, relopt_kind kind)
 	StdRdOptions *rdopts;
 	int			numoptions;
 	static const relopt_parse_elt tab[] = {
+		{"on_commit_delete_rows", RELOPT_TYPE_BOOL,
+		offsetof(StdRdOptions, on_commit_delete_rows)},
 		{"fillfactor", RELOPT_TYPE_INT, offsetof(StdRdOptions, fillfactor)},
 		{"autovacuum_enabled", RELOPT_TYPE_BOOL,
 		offsetof(StdRdOptions, autovacuum) + offsetof(AutoVacOpts, enabled)},
diff --git a/src/backend/access/gin/ginfast.c b/src/backend/access/gin/ginfast.c
index 439a91b..06fb671 100644
--- a/src/backend/access/gin/ginfast.c
+++ b/src/backend/access/gin/ginfast.c
@@ -23,6 +23,7 @@
 #include "access/xloginsert.h"
 #include "access/xlog.h"
 #include "commands/vacuum.h"
+#include "catalog/index.h"
 #include "catalog/pg_am.h"
 #include "miscadmin.h"
 #include "utils/memutils.h"
@@ -241,6 +242,13 @@ ginHeapTupleFastInsert(GinState *ginstate, GinTupleCollector *collector)
 	metabuffer = ReadBuffer(index, GIN_METAPAGE_BLKNO);
 	metapage = BufferGetPage(metabuffer);
 
+	if (GlobalTempRelationPageIsNotInitialized(index, metapage))
+	{
+		Relation heap = RelationIdGetRelation(index->rd_index->indrelid);
+		ginbuild(heap, index, BuildIndexInfo(index));
+		RelationClose(heap);
+	}
+
 	/*
 	 * An insertion to the pending list could logically belong anywhere in the
 	 * tree, so it conflicts with all serializable scans.  All scans acquire a
diff --git a/src/backend/access/gin/ginget.c b/src/backend/access/gin/ginget.c
index b18ae2b..a7ad4c6 100644
--- a/src/backend/access/gin/ginget.c
+++ b/src/backend/access/gin/ginget.c
@@ -16,6 +16,7 @@
 
 #include "access/gin_private.h"
 #include "access/relscan.h"
+#include "catalog/index.h"
 #include "miscadmin.h"
 #include "storage/predicate.h"
 #include "utils/datum.h"
@@ -1759,7 +1760,8 @@ scanPendingInsert(IndexScanDesc scan, TIDBitmap *tbm, int64 *ntids)
 				match;
 	int			i;
 	pendingPosition pos;
-	Buffer		metabuffer = ReadBuffer(scan->indexRelation, GIN_METAPAGE_BLKNO);
+	Relation    index = scan->indexRelation;
+	Buffer		metabuffer = ReadBuffer(index, GIN_METAPAGE_BLKNO);
 	Page		page;
 	BlockNumber blkno;
 
@@ -1769,11 +1771,19 @@ scanPendingInsert(IndexScanDesc scan, TIDBitmap *tbm, int64 *ntids)
 	 * Acquire predicate lock on the metapage, to conflict with any fastupdate
 	 * insertions.
 	 */
-	PredicateLockPage(scan->indexRelation, GIN_METAPAGE_BLKNO, scan->xs_snapshot);
+	PredicateLockPage(index, GIN_METAPAGE_BLKNO, scan->xs_snapshot);
 
 	LockBuffer(metabuffer, GIN_SHARE);
 	page = BufferGetPage(metabuffer);
-	TestForOldSnapshot(scan->xs_snapshot, scan->indexRelation, page);
+	TestForOldSnapshot(scan->xs_snapshot, index, page);
+
+	if (GlobalTempRelationPageIsNotInitialized(index, page))
+	{
+		Relation heap = RelationIdGetRelation(index->rd_index->indrelid);
+		ginbuild(heap, index, BuildIndexInfo(index));
+		RelationClose(heap);
+		UnlockReleaseBuffer(metabuffer);
+	}
 	blkno = GinPageGetMeta(page)->head;
 
 	/*
@@ -1784,10 +1794,9 @@ scanPendingInsert(IndexScanDesc scan, TIDBitmap *tbm, int64 *ntids)
 	{
 		/* No pending list, so proceed with normal scan */
 		UnlockReleaseBuffer(metabuffer);
-		return;
 	}
 
-	pos.pendingBuffer = ReadBuffer(scan->indexRelation, blkno);
+	pos.pendingBuffer = ReadBuffer(index, blkno);
 	LockBuffer(pos.pendingBuffer, GIN_SHARE);
 	pos.firstOffset = FirstOffsetNumber;
 	UnlockReleaseBuffer(metabuffer);
diff --git a/src/backend/access/gin/gininsert.c b/src/backend/access/gin/gininsert.c
index 55eab14..d6739f3 100644
--- a/src/backend/access/gin/gininsert.c
+++ b/src/backend/access/gin/gininsert.c
@@ -328,7 +328,7 @@ ginbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	MemoryContext oldCtx;
 	OffsetNumber attnum;
 
-	if (RelationGetNumberOfBlocks(index) != 0)
+	if (RelationGetNumberOfBlocks(index) != 0 && index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
 		elog(ERROR, "index \"%s\" already contains data",
 			 RelationGetRelationName(index));
 
@@ -337,7 +337,15 @@ ginbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	memset(&buildstate.buildStats, 0, sizeof(GinStatsData));
 
 	/* initialize the meta page */
-	MetaBuffer = GinNewBuffer(index);
+	if (index->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
+	{
+		MetaBuffer = ReadBuffer(index, 0);
+		LockBuffer(MetaBuffer, GIN_SHARE);
+	}
+	else
+	{
+		MetaBuffer = GinNewBuffer(index);
+	}
 
 	/* initialize the root page */
 	RootBuffer = GinNewBuffer(index);
diff --git a/src/backend/access/gist/gist.c b/src/backend/access/gist/gist.c
index 0cc8791..bcde5ea 100644
--- a/src/backend/access/gist/gist.c
+++ b/src/backend/access/gist/gist.c
@@ -16,6 +16,7 @@
 
 #include "access/gist_private.h"
 #include "access/gistscan.h"
+#include "catalog/index.h"
 #include "catalog/pg_collation.h"
 #include "miscadmin.h"
 #include "storage/lmgr.h"
@@ -677,7 +678,10 @@ gistdoinsert(Relation r, IndexTuple itup, Size freespace,
 		if (!xlocked)
 		{
 			LockBuffer(stack->buffer, GIST_SHARE);
-			gistcheckpage(state.r, stack->buffer);
+			if (stack->blkno == GIST_ROOT_BLKNO && GlobalTempRelationPageIsNotInitialized(state.r, BufferGetPage(stack->buffer)))
+				gistbuild(heapRel, r, BuildIndexInfo(r));
+			else
+				gistcheckpage(state.r, stack->buffer);
 		}
 
 		stack->page = (Page) BufferGetPage(stack->buffer);
diff --git a/src/backend/access/gist/gistbuild.c b/src/backend/access/gist/gistbuild.c
index 2f4543d..8d194c8 100644
--- a/src/backend/access/gist/gistbuild.c
+++ b/src/backend/access/gist/gistbuild.c
@@ -156,7 +156,7 @@ gistbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	 * We expect to be called exactly once for any index relation. If that's
 	 * not the case, big trouble's what we have.
 	 */
-	if (RelationGetNumberOfBlocks(index) != 0)
+	if (RelationGetNumberOfBlocks(index) != 0 && index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
 		elog(ERROR, "index \"%s\" already contains data",
 			 RelationGetRelationName(index));
 
@@ -171,8 +171,16 @@ gistbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	buildstate.giststate->tempCxt = createTempGistContext();
 
 	/* initialize the root page */
-	buffer = gistNewBuffer(index);
-	Assert(BufferGetBlockNumber(buffer) == GIST_ROOT_BLKNO);
+	if (index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
+	{
+		buffer = gistNewBuffer(index);
+		Assert(BufferGetBlockNumber(buffer) == GIST_ROOT_BLKNO);
+	}
+	else
+	{
+		buffer = ReadBuffer(index, GIST_ROOT_BLKNO);
+		LockBuffer(buffer, GIST_SHARE);
+	}
 	page = BufferGetPage(buffer);
 
 	START_CRIT_SECTION();
diff --git a/src/backend/access/gist/gistget.c b/src/backend/access/gist/gistget.c
index 22d790d..5560a41 100644
--- a/src/backend/access/gist/gistget.c
+++ b/src/backend/access/gist/gistget.c
@@ -17,8 +17,10 @@
 #include "access/genam.h"
 #include "access/gist_private.h"
 #include "access/relscan.h"
+#include "catalog/index.h"
 #include "miscadmin.h"
 #include "storage/lmgr.h"
+#include "storage/freespace.h"
 #include "storage/predicate.h"
 #include "pgstat.h"
 #include "lib/pairingheap.h"
@@ -344,7 +346,10 @@ gistScanPage(IndexScanDesc scan, GISTSearchItem *pageItem,
 	buffer = ReadBuffer(scan->indexRelation, pageItem->blkno);
 	LockBuffer(buffer, GIST_SHARE);
 	PredicateLockPage(r, BufferGetBlockNumber(buffer), scan->xs_snapshot);
-	gistcheckpage(scan->indexRelation, buffer);
+	if (pageItem->blkno == GIST_ROOT_BLKNO && GlobalTempRelationPageIsNotInitialized(r, BufferGetPage(buffer)))
+		gistbuild(scan->heapRelation, r, BuildIndexInfo(r));
+	else
+		gistcheckpage(scan->indexRelation, buffer);
 	page = BufferGetPage(buffer);
 	TestForOldSnapshot(scan->xs_snapshot, r, page);
 	opaque = GistPageGetOpaque(page);
diff --git a/src/backend/access/gist/gistutil.c b/src/backend/access/gist/gistutil.c
index 45804d7..50b306a 100644
--- a/src/backend/access/gist/gistutil.c
+++ b/src/backend/access/gist/gistutil.c
@@ -1028,7 +1028,7 @@ gistGetFakeLSN(Relation rel)
 {
 	static XLogRecPtr counter = FirstNormalUnloggedLSN;
 
-	if (rel->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
+	if (RelationHasSessionScope(rel))
 	{
 		/*
 		 * Temporary relations are only accessible in our session, so a simple
diff --git a/src/backend/access/hash/hash.c b/src/backend/access/hash/hash.c
index 5cc30da..1b228db 100644
--- a/src/backend/access/hash/hash.c
+++ b/src/backend/access/hash/hash.c
@@ -119,7 +119,7 @@ hashbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	 * We expect to be called exactly once for any index relation. If that's
 	 * not the case, big trouble's what we have.
 	 */
-	if (RelationGetNumberOfBlocks(index) != 0)
+	if (RelationGetNumberOfBlocks(index) != 0 && index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
 		elog(ERROR, "index \"%s\" already contains data",
 			 RelationGetRelationName(index));
 
diff --git a/src/backend/access/hash/hashpage.c b/src/backend/access/hash/hashpage.c
index 838ee68..544d01b 100644
--- a/src/backend/access/hash/hashpage.c
+++ b/src/backend/access/hash/hashpage.c
@@ -30,6 +30,8 @@
 
 #include "access/hash.h"
 #include "access/hash_xlog.h"
+#include "catalog/index.h"
+#include "catalog/pg_am.h"
 #include "miscadmin.h"
 #include "storage/lmgr.h"
 #include "storage/smgr.h"
@@ -75,13 +77,22 @@ _hash_getbuf(Relation rel, BlockNumber blkno, int access, int flags)
 
 	buf = ReadBuffer(rel, blkno);
 
-	if (access != HASH_NOLOCK)
-		LockBuffer(buf, access);
-
 	/* ref count and lock type are correct */
 
-	_hash_checkpage(rel, buf, flags);
-
+	if (blkno == HASH_METAPAGE && GlobalTempRelationPageIsNotInitialized(rel, BufferGetPage(buf)))
+	{
+		Relation heap = RelationIdGetRelation(rel->rd_index->indrelid);
+		hashbuild(heap, rel, BuildIndexInfo(rel));
+		RelationClose(heap);
+		if (access != HASH_NOLOCK)
+			LockBuffer(buf, access);
+	}
+	else
+	{
+		if (access != HASH_NOLOCK)
+			LockBuffer(buf, access);
+		_hash_checkpage(rel, buf, flags);
+	}
 	return buf;
 }
 
@@ -339,7 +350,7 @@ _hash_init(Relation rel, double num_tuples, ForkNumber forkNum)
 	bool		use_wal;
 
 	/* safety check */
-	if (RelationGetNumberOfBlocksInFork(rel, forkNum) != 0)
+	if (rel->rd_rel->relpersistence != RELPERSISTENCE_SESSION && RelationGetNumberOfBlocksInFork(rel, forkNum) != 0)
 		elog(ERROR, "cannot initialize non-empty hash index \"%s\"",
 			 RelationGetRelationName(rel));
 
diff --git a/src/backend/access/heap/heapam_handler.c b/src/backend/access/heap/heapam_handler.c
index 2dd8821..92df373 100644
--- a/src/backend/access/heap/heapam_handler.c
+++ b/src/backend/access/heap/heapam_handler.c
@@ -673,6 +673,7 @@ heapam_relation_copy_data(Relation rel, const RelFileNode *newrnode)
 			 * init fork of an unlogged relation.
 			 */
 			if (rel->rd_rel->relpersistence == RELPERSISTENCE_PERMANENT ||
+				rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ||
 				(rel->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED &&
 				 forkNum == INIT_FORKNUM))
 				log_smgrcreate(newrnode, forkNum);
diff --git a/src/backend/access/nbtree/nbtpage.c b/src/backend/access/nbtree/nbtpage.c
index 268f869..eff9e10 100644
--- a/src/backend/access/nbtree/nbtpage.c
+++ b/src/backend/access/nbtree/nbtpage.c
@@ -27,8 +27,10 @@
 #include "access/transam.h"
 #include "access/xlog.h"
 #include "access/xloginsert.h"
+#include "catalog/index.h"
 #include "miscadmin.h"
 #include "storage/indexfsm.h"
+#include "storage/buf_internals.h"
 #include "storage/lmgr.h"
 #include "storage/predicate.h"
 #include "utils/snapmgr.h"
@@ -762,8 +764,22 @@ _bt_getbuf(Relation rel, BlockNumber blkno, int access)
 	{
 		/* Read an existing block of the relation */
 		buf = ReadBuffer(rel, blkno);
-		LockBuffer(buf, access);
-		_bt_checkpage(rel, buf);
+		/* Session temporary relation may be not yet initialized for this backend. */
+		if (blkno == BTREE_METAPAGE && GlobalTempRelationPageIsNotInitialized(rel, BufferGetPage(buf)))
+		{
+			Relation heap = RelationIdGetRelation(rel->rd_index->indrelid);
+			ReleaseBuffer(buf);
+			DropRelFileNodeLocalBuffers(rel->rd_node, MAIN_FORKNUM, blkno);
+			btbuild(heap, rel, BuildIndexInfo(rel));
+			RelationClose(heap);
+			buf = ReadBuffer(rel, blkno);
+			LockBuffer(buf, access);
+		}
+		else
+		{
+			LockBuffer(buf, access);
+			_bt_checkpage(rel, buf);
+		}
 	}
 	else
 	{
diff --git a/src/backend/access/nbtree/nbtsort.c b/src/backend/access/nbtree/nbtsort.c
index ab19692..227bc19 100644
--- a/src/backend/access/nbtree/nbtsort.c
+++ b/src/backend/access/nbtree/nbtsort.c
@@ -330,7 +330,7 @@ btbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	 * We expect to be called exactly once for any index relation. If that's
 	 * not the case, big trouble's what we have.
 	 */
-	if (RelationGetNumberOfBlocks(index) != 0)
+	if (RelationGetNumberOfBlocks(index) != 0 && index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
 		elog(ERROR, "index \"%s\" already contains data",
 			 RelationGetRelationName(index));
 
diff --git a/src/backend/access/spgist/spginsert.c b/src/backend/access/spgist/spginsert.c
index b40bd44..f44bec7 100644
--- a/src/backend/access/spgist/spginsert.c
+++ b/src/backend/access/spgist/spginsert.c
@@ -81,21 +81,32 @@ spgbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 				rootbuffer,
 				nullbuffer;
 
-	if (RelationGetNumberOfBlocks(index) != 0)
-		elog(ERROR, "index \"%s\" already contains data",
-			 RelationGetRelationName(index));
-
-	/*
-	 * Initialize the meta page and root pages
-	 */
-	metabuffer = SpGistNewBuffer(index);
-	rootbuffer = SpGistNewBuffer(index);
-	nullbuffer = SpGistNewBuffer(index);
-
-	Assert(BufferGetBlockNumber(metabuffer) == SPGIST_METAPAGE_BLKNO);
-	Assert(BufferGetBlockNumber(rootbuffer) == SPGIST_ROOT_BLKNO);
-	Assert(BufferGetBlockNumber(nullbuffer) == SPGIST_NULL_BLKNO);
-
+	if (index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
+	{
+		if (RelationGetNumberOfBlocks(index) != 0)
+			elog(ERROR, "index \"%s\" already contains data",
+				 RelationGetRelationName(index));
+
+		/*
+		 * Initialize the meta page and root pages
+		 */
+		metabuffer = SpGistNewBuffer(index);
+		rootbuffer = SpGistNewBuffer(index);
+		nullbuffer = SpGistNewBuffer(index);
+
+		Assert(BufferGetBlockNumber(metabuffer) == SPGIST_METAPAGE_BLKNO);
+		Assert(BufferGetBlockNumber(rootbuffer) == SPGIST_ROOT_BLKNO);
+		Assert(BufferGetBlockNumber(nullbuffer) == SPGIST_NULL_BLKNO);
+	}
+	else
+	{
+		metabuffer = ReadBuffer(index, SPGIST_METAPAGE_BLKNO);
+		rootbuffer = ReadBuffer(index, SPGIST_ROOT_BLKNO);
+		nullbuffer = ReadBuffer(index, SPGIST_NULL_BLKNO);
+		LockBuffer(metabuffer, BUFFER_LOCK_SHARE);
+		LockBuffer(rootbuffer, BUFFER_LOCK_SHARE);
+		LockBuffer(nullbuffer, BUFFER_LOCK_SHARE);
+	}
 	START_CRIT_SECTION();
 
 	SpGistInitMetapage(BufferGetPage(metabuffer));
diff --git a/src/backend/access/spgist/spgutils.c b/src/backend/access/spgist/spgutils.c
index 45472db..ea15964 100644
--- a/src/backend/access/spgist/spgutils.c
+++ b/src/backend/access/spgist/spgutils.c
@@ -21,6 +21,7 @@
 #include "access/spgist_private.h"
 #include "access/transam.h"
 #include "access/xact.h"
+#include "catalog/index.h"
 #include "catalog/pg_amop.h"
 #include "storage/bufmgr.h"
 #include "storage/indexfsm.h"
@@ -106,6 +107,7 @@ spgGetCache(Relation index)
 		spgConfigIn in;
 		FmgrInfo   *procinfo;
 		Buffer		metabuffer;
+		Page        metapage;
 		SpGistMetaPageData *metadata;
 
 		cache = MemoryContextAllocZero(index->rd_indexcxt,
@@ -155,12 +157,21 @@ spgGetCache(Relation index)
 		metabuffer = ReadBuffer(index, SPGIST_METAPAGE_BLKNO);
 		LockBuffer(metabuffer, BUFFER_LOCK_SHARE);
 
-		metadata = SpGistPageGetMeta(BufferGetPage(metabuffer));
+		metapage = BufferGetPage(metabuffer);
+		metadata = SpGistPageGetMeta(metapage);
 
 		if (metadata->magicNumber != SPGIST_MAGIC_NUMBER)
-			elog(ERROR, "index \"%s\" is not an SP-GiST index",
-				 RelationGetRelationName(index));
-
+		{
+			if (GlobalTempRelationPageIsNotInitialized(index, metapage))
+			{
+				Relation heap = RelationIdGetRelation(index->rd_index->indrelid);
+				spgbuild(heap, index, BuildIndexInfo(index));
+				RelationClose(heap);
+			}
+			else
+				elog(ERROR, "index \"%s\" is not an SP-GiST index",
+					 RelationGetRelationName(index));
+		}
 		cache->lastUsedPages = metadata->lastUsedPages;
 
 		UnlockReleaseBuffer(metabuffer);
diff --git a/src/backend/catalog/catalog.c b/src/backend/catalog/catalog.c
index 1af31c2..e60bdb7 100644
--- a/src/backend/catalog/catalog.c
+++ b/src/backend/catalog/catalog.c
@@ -402,6 +402,9 @@ GetNewRelFileNode(Oid reltablespace, Relation pg_class, char relpersistence)
 		case RELPERSISTENCE_TEMP:
 			backend = BackendIdForTempRelations();
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index f6c31cc..d943b57 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3652,7 +3652,7 @@ reindex_relation(Oid relid, int flags, int options)
 		if (flags & REINDEX_REL_FORCE_INDEXES_UNLOGGED)
 			persistence = RELPERSISTENCE_UNLOGGED;
 		else if (flags & REINDEX_REL_FORCE_INDEXES_PERMANENT)
-			persistence = RELPERSISTENCE_PERMANENT;
+			persistence = rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ? RELPERSISTENCE_SESSION : RELPERSISTENCE_PERMANENT;
 		else
 			persistence = rel->rd_rel->relpersistence;
 
diff --git a/src/backend/catalog/storage.c b/src/backend/catalog/storage.c
index 625af8d..1e192fa 100644
--- a/src/backend/catalog/storage.c
+++ b/src/backend/catalog/storage.c
@@ -93,6 +93,10 @@ RelationCreateStorage(RelFileNode rnode, char relpersistence)
 			backend = InvalidBackendId;
 			needs_wal = false;
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			needs_wal = false;
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
 			needs_wal = true;
diff --git a/src/backend/catalog/system_views.sql b/src/backend/catalog/system_views.sql
index 9fe4a47..46b07c4 100644
--- a/src/backend/catalog/system_views.sql
+++ b/src/backend/catalog/system_views.sql
@@ -1327,7 +1327,17 @@ LANGUAGE INTERNAL
 STRICT STABLE PARALLEL SAFE
 AS 'jsonb_path_query_first_tz';
 
+
+--
+-- Statistic for global temporary tables
 --
+
+CREATE VIEW pg_sequence_params AS select s.* from pg_class c,pg_sequence_parameters(c.oid) s where c.relkind='S';
+
+CREATE VIEW pg_gtt_statistic AS
+   SELECT s.* from pg_class c,pg_gtt_statistic_for_relation(c.oid) s where c.relpersistence='s';
+
+
 -- The default permissions for functions mean that anyone can execute them.
 -- A number of functions shouldn't be executable by just anyone, but rather
 -- than use explicit 'superuser()' checks in those functions, we use the GRANT
diff --git a/src/backend/commands/analyze.c b/src/backend/commands/analyze.c
index 7accb95..fb11f26 100644
--- a/src/backend/commands/analyze.c
+++ b/src/backend/commands/analyze.c
@@ -39,6 +39,7 @@
 #include "commands/vacuum.h"
 #include "executor/executor.h"
 #include "foreign/fdwapi.h"
+#include "funcapi.h"
 #include "miscadmin.h"
 #include "nodes/nodeFuncs.h"
 #include "parser/parse_oper.h"
@@ -102,7 +103,7 @@ static int	acquire_inherited_sample_rows(Relation onerel, int elevel,
 										  HeapTuple *rows, int targrows,
 										  double *totalrows, double *totaldeadrows);
 static void update_attstats(Oid relid, bool inh,
-							int natts, VacAttrStats **vacattrstats);
+							int natts, VacAttrStats **vacattrstats, bool is_global_temp);
 static Datum std_fetch_func(VacAttrStatsP stats, int rownum, bool *isNull);
 static Datum ind_fetch_func(VacAttrStatsP stats, int rownum, bool *isNull);
 
@@ -318,6 +319,7 @@ do_analyze_rel(Relation onerel, VacuumParams *params,
 	Oid			save_userid;
 	int			save_sec_context;
 	int			save_nestlevel;
+	bool        is_global_temp = onerel->rd_rel->relpersistence == RELPERSISTENCE_SESSION;
 
 	if (inh)
 		ereport(elevel,
@@ -575,14 +577,14 @@ do_analyze_rel(Relation onerel, VacuumParams *params,
 		 * pg_statistic for columns we didn't process, we leave them alone.)
 		 */
 		update_attstats(RelationGetRelid(onerel), inh,
-						attr_cnt, vacattrstats);
+						attr_cnt, vacattrstats, is_global_temp);
 
 		for (ind = 0; ind < nindexes; ind++)
 		{
 			AnlIndexData *thisdata = &indexdata[ind];
 
 			update_attstats(RelationGetRelid(Irel[ind]), false,
-							thisdata->attr_cnt, thisdata->vacattrstats);
+							thisdata->attr_cnt, thisdata->vacattrstats, is_global_temp);
 		}
 
 		/*
@@ -1425,7 +1427,7 @@ acquire_inherited_sample_rows(Relation onerel, int elevel,
  *		by taking a self-exclusive lock on the relation in analyze_rel().
  */
 static void
-update_attstats(Oid relid, bool inh, int natts, VacAttrStats **vacattrstats)
+update_attstats(Oid relid, bool inh, int natts, VacAttrStats **vacattrstats, bool is_global_temp)
 {
 	Relation	sd;
 	int			attno;
@@ -1527,30 +1529,42 @@ update_attstats(Oid relid, bool inh, int natts, VacAttrStats **vacattrstats)
 			}
 		}
 
-		/* Is there already a pg_statistic tuple for this attribute? */
-		oldtup = SearchSysCache3(STATRELATTINH,
-								 ObjectIdGetDatum(relid),
-								 Int16GetDatum(stats->attr->attnum),
-								 BoolGetDatum(inh));
-
-		if (HeapTupleIsValid(oldtup))
+		if (is_global_temp)
 		{
-			/* Yes, replace it */
-			stup = heap_modify_tuple(oldtup,
-									 RelationGetDescr(sd),
-									 values,
-									 nulls,
-									 replaces);
-			ReleaseSysCache(oldtup);
-			CatalogTupleUpdate(sd, &stup->t_self, stup);
+			stup = heap_form_tuple(RelationGetDescr(sd), values, nulls);
+			InsertSysCache(STATRELATTINH,
+						   ObjectIdGetDatum(relid),
+						   Int16GetDatum(stats->attr->attnum),
+						   BoolGetDatum(inh),
+						   0,
+						   stup);
 		}
 		else
 		{
-			/* No, insert new tuple */
-			stup = heap_form_tuple(RelationGetDescr(sd), values, nulls);
-			CatalogTupleInsert(sd, stup);
-		}
+			/* Is there already a pg_statistic tuple for this attribute? */
+			oldtup = SearchSysCache3(STATRELATTINH,
+									 ObjectIdGetDatum(relid),
+									 Int16GetDatum(stats->attr->attnum),
+									 BoolGetDatum(inh));
 
+			if (HeapTupleIsValid(oldtup))
+			{
+				/* Yes, replace it */
+				stup = heap_modify_tuple(oldtup,
+										 RelationGetDescr(sd),
+										 values,
+										 nulls,
+										 replaces);
+				ReleaseSysCache(oldtup);
+				CatalogTupleUpdate(sd, &stup->t_self, stup);
+			}
+			else
+			{
+				/* No, insert new tuple */
+				stup = heap_form_tuple(RelationGetDescr(sd), values, nulls);
+				CatalogTupleInsert(sd, stup);
+			}
+		}
 		heap_freetuple(stup);
 	}
 
@@ -2859,3 +2873,114 @@ analyze_mcv_list(int *mcv_counts,
 	}
 	return num_mcv;
 }
+
+PG_FUNCTION_INFO_V1(pg_gtt_statistic_for_relation);
+
+typedef struct
+{
+	int staattnum;
+	bool stainherit;
+} PgTempStatIteratorCtx;
+
+Datum
+pg_gtt_statistic_for_relation(PG_FUNCTION_ARGS)
+{
+	Oid starelid = PG_GETARG_OID(0);
+#if 1
+	ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
+	Tuplestorestate *tupstore;
+	MemoryContext per_query_ctx;
+	MemoryContext oldcontext;
+	TupleDesc	  tupdesc;
+	bool stainherit = false;
+
+	/* check to see if caller supports us returning a tuplestore */
+	if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
+		elog(ERROR, "return type must be a row type");
+
+	/* check to see if caller supports us returning a tuplestore */
+	if (rsinfo == NULL || !IsA(rsinfo, ReturnSetInfo))
+		ereport(ERROR,
+				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+				 errmsg("set-valued function called in context that cannot accept a set")));
+	if (!(rsinfo->allowedModes & SFRM_Materialize))
+		ereport(ERROR,
+				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+				 errmsg("materialize mode required, but it is not " \
+						"allowed in this context")));
+
+	/* Build tuplestore to hold the result rows */
+	per_query_ctx = rsinfo->econtext->ecxt_per_query_memory;
+	oldcontext = MemoryContextSwitchTo(per_query_ctx);
+
+	/* Build a tuple descriptor for our result type */
+
+	tupstore = tuplestore_begin_heap(true, false, work_mem);
+	rsinfo->returnMode = SFRM_Materialize;
+	rsinfo->setResult = tupstore;
+	rsinfo->setDesc = tupdesc;
+
+	do
+	{
+		int staattnum = 0;
+		while (true)
+		{
+			HeapTuple* statup = SearchSysCacheCopy3(STATRELATTINH,
+												ObjectIdGetDatum(starelid),
+												Int16GetDatum(++staattnum),
+												BoolGetDatum(stainherit));
+			if (statup != NULL)
+				tuplestore_puttuple(tupstore, statup);
+			else
+				break;
+		}
+		stainherit = !stainherit;
+	} while (stainherit);
+
+	MemoryContextSwitchTo(oldcontext);
+ 
+	tuplestore_donestoring(tupstore);
+
+	return (Datum) 0;
+#else
+	FuncCallContext *funcctx;
+	PgTempStatIteratorCtx *it;
+	HeapTuple statup;
+
+	if (SRF_IS_FIRSTCALL())
+	{
+		MemoryContext oldcontext;
+
+		/* create a function context for cross-call persistence */
+		funcctx = SRF_FIRSTCALL_INIT();
+
+		/* switch to memory context appropriate for multiple function calls */
+		oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
+		it = palloc0(sizeof(PgTempStatIteratorCtx));
+		funcctx->user_fctx = (void *)it;
+
+		MemoryContextSwitchTo(oldcontext);
+	}
+	else
+	{
+		funcctx = SRF_PERCALL_SETUP();
+		it = (PgTempStatIteratorCtx*)funcctx->user_fctx;
+	}
+	while (true)
+	{
+		it->staattnum += 1;
+		statup = SearchSysCacheCopy3(STATRELATTINH,
+								 ObjectIdGetDatum(starelid),
+								 Int16GetDatum(it->staattnum),
+								 BoolGetDatum(it->stainherit));
+		if (statup != NULL)
+			SRF_RETURN_NEXT(funcctx, statup);
+
+		if (it->stainherit)
+			SRF_RETURN_DONE(funcctx);
+
+		it->stainherit = true;
+		it->staattnum = 0;
+	}
+#endif
+}
diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index a23128d..b1b786d 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -392,6 +392,13 @@ cluster_rel(Oid tableOid, Oid indexOid, int options)
 					 errmsg("cannot vacuum temporary tables of other sessions")));
 	}
 
+	/* not support cluster global temp table yet */
+	if (OldHeap->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
+		ereport(ERROR,
+				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+				errmsg("not support cluster global temporary tables yet")));
+
+
 	/*
 	 * Also check for active uses of the relation in the current transaction,
 	 * including open scans and pending AFTER trigger events.
@@ -1400,7 +1407,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap,
 	 */
 	if (newrelpersistence == RELPERSISTENCE_UNLOGGED)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_UNLOGGED;
-	else if (newrelpersistence == RELPERSISTENCE_PERMANENT)
+	else if (newrelpersistence != RELPERSISTENCE_TEMP)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_PERMANENT;
 
 	/* Report that we are now reindexing relations */
diff --git a/src/backend/commands/sequence.c b/src/backend/commands/sequence.c
index a13322b..be661a4 100644
--- a/src/backend/commands/sequence.c
+++ b/src/backend/commands/sequence.c
@@ -94,7 +94,7 @@ static HTAB *seqhashtab = NULL; /* hash table for SeqTable items */
  */
 static SeqTableData *last_used_seq = NULL;
 
-static void fill_seq_with_data(Relation rel, HeapTuple tuple);
+static void fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf);
 static Relation lock_and_open_sequence(SeqTable seq);
 static void create_seq_hashtable(void);
 static void init_sequence(Oid relid, SeqTable *p_elm, Relation *p_rel);
@@ -222,7 +222,7 @@ DefineSequence(ParseState *pstate, CreateSeqStmt *seq)
 
 	/* now initialize the sequence's data */
 	tuple = heap_form_tuple(tupDesc, value, null);
-	fill_seq_with_data(rel, tuple);
+	fill_seq_with_data(rel, tuple, InvalidBuffer);
 
 	/* process OWNED BY if given */
 	if (owned_by)
@@ -327,7 +327,7 @@ ResetSequence(Oid seq_relid)
 	/*
 	 * Insert the modified tuple into the new storage file.
 	 */
-	fill_seq_with_data(seq_rel, tuple);
+	fill_seq_with_data(seq_rel, tuple, InvalidBuffer);
 
 	/* Clear local cache so that we don't think we have cached numbers */
 	/* Note that we do not change the currval() state */
@@ -340,18 +340,21 @@ ResetSequence(Oid seq_relid)
  * Initialize a sequence's relation with the specified tuple as content
  */
 static void
-fill_seq_with_data(Relation rel, HeapTuple tuple)
+fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf)
 {
-	Buffer		buf;
 	Page		page;
 	sequence_magic *sm;
 	OffsetNumber offnum;
+	bool lockBuffer = false;
 
 	/* Initialize first page of relation with special magic number */
 
-	buf = ReadBuffer(rel, P_NEW);
-	Assert(BufferGetBlockNumber(buf) == 0);
-
+	if (buf == InvalidBuffer)
+	{
+		buf = ReadBuffer(rel, P_NEW);
+		Assert(BufferGetBlockNumber(buf) == 0);
+		lockBuffer = true;
+	}
 	page = BufferGetPage(buf);
 
 	PageInit(page, BufferGetPageSize(buf), sizeof(sequence_magic));
@@ -360,7 +363,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	/* Now insert sequence tuple */
 
-	LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
+	if (lockBuffer)
+		LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
 
 	/*
 	 * Since VACUUM does not process sequences, we have to force the tuple to
@@ -410,7 +414,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	END_CRIT_SECTION();
 
-	UnlockReleaseBuffer(buf);
+	if (lockBuffer)
+		UnlockReleaseBuffer(buf);
 }
 
 /*
@@ -502,7 +507,7 @@ AlterSequence(ParseState *pstate, AlterSeqStmt *stmt)
 		/*
 		 * Insert the modified tuple into the new storage file.
 		 */
-		fill_seq_with_data(seqrel, newdatatuple);
+		fill_seq_with_data(seqrel, newdatatuple, InvalidBuffer);
 	}
 
 	/* process OWNED BY if given */
@@ -1178,6 +1183,17 @@ read_seq_tuple(Relation rel, Buffer *buf, HeapTuple seqdatatuple)
 	LockBuffer(*buf, BUFFER_LOCK_EXCLUSIVE);
 
 	page = BufferGetPage(*buf);
+	if (GlobalTempRelationPageIsNotInitialized(rel, page))
+	{
+		/* Initialize sequence for global temporary tables */
+		Datum		value[SEQ_COL_LASTCOL] = {0};
+		bool		null[SEQ_COL_LASTCOL] = {false};
+		HeapTuple tuple;
+		value[SEQ_COL_LASTVAL-1] = Int64GetDatumFast(1); /* start sequence with 1 */
+		tuple = heap_form_tuple(RelationGetDescr(rel), value, null);
+		fill_seq_with_data(rel, tuple, *buf);
+	}
+
 	sm = (sequence_magic *) PageGetSpecialPointer(page);
 
 	if (sm->magic != SEQ_MAGIC)
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 8d25d14..21d5a30 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -12,6 +12,9 @@
  *
  *-------------------------------------------------------------------------
  */
+#include <sys/stat.h>
+#include <unistd.h>
+
 #include "postgres.h"
 
 #include "access/genam.h"
@@ -533,6 +536,23 @@ static List *GetParentedForeignKeyRefs(Relation partition);
 static void ATDetachCheckNoForeignKeyRefs(Relation partition);
 
 
+static bool
+has_oncommit_option(List *options)
+{
+	ListCell   *listptr;
+
+	foreach(listptr, options)
+	{
+		DefElem    *def = (DefElem *) lfirst(listptr);
+
+		if (pg_strcasecmp(def->defname, "on_commit_delete_rows") == 0)
+			return true;
+	}
+
+	return false;
+}
+
+
 /* ----------------------------------------------------------------
  *		DefineRelation
  *				Creates a new relation.
@@ -576,6 +596,7 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 	LOCKMODE	parentLockmode;
 	const char *accessMethod = NULL;
 	Oid			accessMethodId = InvalidOid;
+	bool		has_oncommit_clause = false;
 
 	/*
 	 * Truncate relname to appropriate length (probably a waste of time, as
@@ -587,7 +608,7 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 	 * Check consistency of arguments
 	 */
 	if (stmt->oncommit != ONCOMMIT_NOOP
-		&& stmt->relation->relpersistence != RELPERSISTENCE_TEMP)
+		&& !IsLocalRelpersistence(stmt->relation->relpersistence))
 		ereport(ERROR,
 				(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 				 errmsg("ON COMMIT can only be used on temporary tables")));
@@ -613,17 +634,6 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 		RangeVarGetAndCheckCreationNamespace(stmt->relation, NoLock, NULL);
 
 	/*
-	 * Security check: disallow creating temp tables from security-restricted
-	 * code.  This is needed because calling code might not expect untrusted
-	 * tables to appear in pg_temp at the front of its search path.
-	 */
-	if (stmt->relation->relpersistence == RELPERSISTENCE_TEMP
-		&& InSecurityRestrictedOperation())
-		ereport(ERROR,
-				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
-				 errmsg("cannot create temporary table within security-restricted operation")));
-
-	/*
 	 * Determine the lockmode to use when scanning parents.  A self-exclusive
 	 * lock is needed here.
 	 *
@@ -718,6 +728,38 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 	/*
 	 * Parse and validate reloptions, if any.
 	 */
+	/* global temp table */
+	has_oncommit_clause = has_oncommit_option(stmt->options);
+	if (stmt->relation->relpersistence == RELPERSISTENCE_SESSION)
+	{
+		if (has_oncommit_clause)
+		{
+			if (stmt->oncommit != ONCOMMIT_NOOP)
+				elog(ERROR, "can not defeine global temp table with on commit and with clause at same time");
+		}
+		else if (stmt->oncommit != ONCOMMIT_NOOP)
+		{
+			DefElem *opt = makeNode(DefElem);
+
+			opt->type = T_DefElem;
+			opt->defnamespace = NULL;
+			opt->defname = "on_commit_delete_rows";
+			opt->defaction = DEFELEM_UNSPEC;
+
+			/* use reloptions to remember on commit clause */
+			if (stmt->oncommit == ONCOMMIT_DELETE_ROWS)
+				opt->arg  = (Node *)makeString("true");
+			else if (stmt->oncommit == ONCOMMIT_PRESERVE_ROWS)
+				opt->arg  = (Node *)makeString("false");
+			else
+				elog(ERROR, "global temp table not support on commit drop clause");
+
+			stmt->options = lappend(stmt->options, opt);
+		}
+	}
+	else if (has_oncommit_clause)
+		elog(ERROR, "regular table cannot specifie on_commit_delete_rows");
+
 	reloptions = transformRelOptions((Datum) 0, stmt->options, NULL, validnsps,
 									 true, false);
 
@@ -1772,7 +1814,8 @@ ExecuteTruncateGuts(List *explicit_rels, List *relids, List *relids_logged,
 		 * table or the current physical file to be thrown away anyway.
 		 */
 		if (rel->rd_createSubid == mySubid ||
-			rel->rd_newRelfilenodeSubid == mySubid)
+			rel->rd_newRelfilenodeSubid == mySubid ||
+			rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
 		{
 			/* Immediate, non-rollbackable truncation is OK */
 			heap_truncate_one_rel(rel);
@@ -3449,6 +3492,26 @@ AlterTableLookupRelation(AlterTableStmt *stmt, LOCKMODE lockmode)
 									(void *) stmt);
 }
 
+
+static bool
+CheckGlobalTempTableNotInUse(Relation rel)
+{
+	int id;
+	for (id = 1; id <= MaxBackends; id++)
+	{
+		if (id != MyBackendId)
+		{
+			struct stat fst;
+			char* path = relpathbackend(rel->rd_node, id, MAIN_FORKNUM);
+			int rc = stat(path, &fst);
+			pfree(path);
+			if (rc == 0 && fst.st_size != 0)
+				return false;
+		}
+	}
+	return true;
+}
+
 /*
  * AlterTable
  *		Execute ALTER TABLE, which can be a list of subcommands
@@ -3500,6 +3563,9 @@ AlterTable(Oid relid, LOCKMODE lockmode, AlterTableStmt *stmt)
 	rel = relation_open(relid, NoLock);
 
 	CheckTableNotInUse(rel, "ALTER TABLE");
+	if (rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION
+		&& !CheckGlobalTempTableNotInUse(rel))
+		elog(ERROR, "Global temp table used by active backends can not be altered");
 
 	ATController(stmt, rel, stmt->cmds, stmt->relation->inh, lockmode);
 }
@@ -7708,6 +7774,12 @@ ATAddForeignKeyConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
 						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 						 errmsg("constraints on unlogged tables may reference only permanent or unlogged tables")));
 			break;
+		case RELPERSISTENCE_SESSION:
+			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
+				ereport(ERROR,
+						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+						 errmsg("constraints on session tables may reference only session tables")));
+			break;
 		case RELPERSISTENCE_TEMP:
 			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_TEMP)
 				ereport(ERROR,
@@ -14140,6 +14212,13 @@ ATPrepChangePersistence(Relation rel, bool toLogged)
 							RelationGetRelationName(rel)),
 					 errtable(rel)));
 			break;
+		case RELPERSISTENCE_SESSION:
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+					 errmsg("cannot change logged status of session table \"%s\"",
+							RelationGetRelationName(rel)),
+					 errtable(rel)));
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			if (toLogged)
 				/* nothing to do */
@@ -14627,14 +14706,7 @@ PreCommit_on_commit_actions(void)
 				/* Do nothing (there shouldn't be such entries, actually) */
 				break;
 			case ONCOMMIT_DELETE_ROWS:
-
-				/*
-				 * If this transaction hasn't accessed any temporary
-				 * relations, we can skip truncating ON COMMIT DELETE ROWS
-				 * tables, as they must still be empty.
-				 */
-				if ((MyXactFlags & XACT_FLAGS_ACCESSEDTEMPNAMESPACE))
-					oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
+				oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
 				break;
 			case ONCOMMIT_DROP:
 				oids_to_drop = lappend_oid(oids_to_drop, oc->relid);
diff --git a/src/backend/optimizer/path/allpaths.c b/src/backend/optimizer/path/allpaths.c
index db3a68a..60212b0 100644
--- a/src/backend/optimizer/path/allpaths.c
+++ b/src/backend/optimizer/path/allpaths.c
@@ -48,6 +48,7 @@
 #include "partitioning/partprune.h"
 #include "rewrite/rewriteManip.h"
 #include "utils/lsyscache.h"
+#include "utils/rel.h"
 
 
 /* results of subquery_is_pushdown_safe */
@@ -618,7 +619,7 @@ set_rel_consider_parallel(PlannerInfo *root, RelOptInfo *rel,
 			 * the rest of the necessary infrastructure right now anyway.  So
 			 * for now, bail out if we see a temporary table.
 			 */
-			if (get_rel_persistence(rte->relid) == RELPERSISTENCE_TEMP)
+			if (IsLocalRelpersistence(get_rel_persistence(rte->relid)))
 				return;
 
 			/*
diff --git a/src/backend/optimizer/plan/planner.c b/src/backend/optimizer/plan/planner.c
index 17c5f08..7c83e7b 100644
--- a/src/backend/optimizer/plan/planner.c
+++ b/src/backend/optimizer/plan/planner.c
@@ -6307,7 +6307,7 @@ plan_create_index_workers(Oid tableOid, Oid indexOid)
 	 * Furthermore, any index predicate or index expressions must be parallel
 	 * safe.
 	 */
-	if (heap->rd_rel->relpersistence == RELPERSISTENCE_TEMP ||
+	if (RelationHasSessionScope(heap) ||
 		!is_parallel_safe(root, (Node *) RelationGetIndexExpressions(index)) ||
 		!is_parallel_safe(root, (Node *) RelationGetIndexPredicate(index)))
 	{
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index 3f67aaf..565c868 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -3266,20 +3266,11 @@ OptTemp:	TEMPORARY					{ $$ = RELPERSISTENCE_TEMP; }
 			| TEMP						{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMPORARY			{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMP				{ $$ = RELPERSISTENCE_TEMP; }
-			| GLOBAL TEMPORARY
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
-			| GLOBAL TEMP
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
+			| GLOBAL TEMPORARY          { $$ = RELPERSISTENCE_SESSION; }
+			| GLOBAL TEMP               { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION                   { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMPORARY         { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMP              { $$ = RELPERSISTENCE_SESSION; }
 			| UNLOGGED					{ $$ = RELPERSISTENCE_UNLOGGED; }
 			| /*EMPTY*/					{ $$ = RELPERSISTENCE_PERMANENT; }
 		;
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index ee47547..ea7fe4c 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -437,6 +437,14 @@ generateSerialExtraStmts(CreateStmtContext *cxt, ColumnDef *column,
 	seqstmt->options = seqoptions;
 
 	/*
+	 * Why we should not always use persistence of parent table?
+	 * Although it is prohibited to have unlogged sequences,
+	 * unlogged tables with SERIAL fields are accepted!
+	 */
+	if (cxt->relation->relpersistence != RELPERSISTENCE_UNLOGGED)
+		seqstmt->sequence->relpersistence = cxt->relation->relpersistence;
+
+	/*
 	 * If a sequence data type was specified, add it to the options.  Prepend
 	 * to the list rather than append; in case a user supplied their own AS
 	 * clause, the "redundant options" error will point to their occurrence,
diff --git a/src/backend/postmaster/autovacuum.c b/src/backend/postmaster/autovacuum.c
index c1dd816..dcfc134 100644
--- a/src/backend/postmaster/autovacuum.c
+++ b/src/backend/postmaster/autovacuum.c
@@ -2157,7 +2157,7 @@ do_autovacuum(void)
 		/*
 		 * We cannot safely process other backends' temp tables, so skip 'em.
 		 */
-		if (classForm->relpersistence == RELPERSISTENCE_TEMP)
+		if (IsLocalRelpersistence(classForm->relpersistence))
 			continue;
 
 		relid = classForm->oid;
diff --git a/src/backend/storage/buffer/bufmgr.c b/src/backend/storage/buffer/bufmgr.c
index 483f705..1129dc3 100644
--- a/src/backend/storage/buffer/bufmgr.c
+++ b/src/backend/storage/buffer/bufmgr.c
@@ -2933,7 +2933,7 @@ DropRelFileNodeBuffers(RelFileNodeBackend rnode, ForkNumber *forkNum,
 	/* If it's a local relation, it's localbuf.c's problem. */
 	if (RelFileNodeBackendIsTemp(rnode))
 	{
-		if (rnode.backend == MyBackendId)
+		if (GetRelationBackendId(rnode.backend) == MyBackendId)
 		{
 			for (j = 0; j < nforks; j++)
 				DropRelFileNodeLocalBuffers(rnode.node, forkNum[j],
diff --git a/src/backend/storage/smgr/md.c b/src/backend/storage/smgr/md.c
index 07f3c93..8cf06f6 100644
--- a/src/backend/storage/smgr/md.c
+++ b/src/backend/storage/smgr/md.c
@@ -28,17 +28,20 @@
 #include "miscadmin.h"
 #include "access/xlogutils.h"
 #include "access/xlog.h"
+#include "commands/tablecmds.h"
 #include "commands/tablespace.h"
 #include "pgstat.h"
 #include "postmaster/bgwriter.h"
 #include "storage/fd.h"
 #include "storage/bufmgr.h"
+#include "storage/ipc.h"
 #include "storage/md.h"
 #include "storage/relfilenode.h"
 #include "storage/smgr.h"
 #include "storage/sync.h"
 #include "utils/hsearch.h"
 #include "utils/memutils.h"
+#include "utils/rel.h"
 #include "pg_trace.h"
 
 /*
@@ -87,6 +90,19 @@ typedef struct _MdfdVec
 
 static MemoryContext MdCxt;		/* context for all MdfdVec objects */
 
+/*
+ * Structure used to collect information created by this backend.
+ * Data of this related should be deleted on backend exit.
+ */
+typedef struct SessionRelation
+{
+	RelFileNodeBackend rnode;
+	ForkNumber forknum;
+	struct SessionRelation* next;
+} SessionRelation;
+
+
+static SessionRelation* SessionRelations;
 
 /* Populate a file tag describing an md.c segment file. */
 #define INIT_MD_FILETAG(a,xx_rnode,xx_forknum,xx_segno) \
@@ -152,6 +168,60 @@ mdinit(void)
 								  ALLOCSET_DEFAULT_SIZES);
 }
 
+
+/*
+ * Delete all data of session relations and remove their pages from shared buffers.
+ * This function is called on backend exit.
+ */
+static void
+TruncateSessionRelations(int code, Datum arg)
+{
+	SessionRelation* rel;
+	for (rel = SessionRelations; rel != NULL; rel = rel->next)
+	{
+		/* Delete relation files */
+		mdunlink(rel->rnode, rel->forknum, false);
+	}
+}
+
+/*
+ * Maintain information about session relations accessed by this backend.
+ * This list is needed to perform cleanup on backend exit.
+ * Session relation is linked in this list when this relation is created or opened and file doesn't exist.
+ * Such procedure guarantee that each relation is linked into list only once.
+ */
+static void
+RegisterSessionRelation(SMgrRelation reln, ForkNumber forknum)
+{
+	SessionRelation* rel = (SessionRelation*)MemoryContextAlloc(TopMemoryContext, sizeof(SessionRelation));
+
+	/*
+	 * Perform session relation cleanup on backend exit. We are using shared memory hook, because
+	 * cleanup should be performed before backend is disconnected from shared memory.
+	 */
+	if (SessionRelations == NULL)
+		on_shmem_exit(TruncateSessionRelations, 0);
+
+	rel->rnode = reln->smgr_rnode;
+	rel->forknum = forknum;
+	rel->next = SessionRelations;
+	SessionRelations = rel;
+}
+
+static void
+RegisterOnCommitAction(SMgrRelation reln, ForkNumber forknum)
+{
+	if (reln->smgr_owner && forknum == MAIN_FORKNUM)
+	{
+		Relation rel = (Relation)((char*)reln->smgr_owner - offsetof(RelationData, rd_smgr));
+		if (rel->rd_options
+			&& ((StdRdOptions *)rel->rd_options)->on_commit_delete_rows)
+		{
+			register_on_commit_action(rel->rd_id, ONCOMMIT_DELETE_ROWS);
+		}
+	}
+}
+
 /*
  *	mdexists() -- Does the physical file exist?
  *
@@ -218,6 +288,8 @@ mdcreate(SMgrRelation reln, ForkNumber forkNum, bool isRedo)
 					 errmsg("could not create file \"%s\": %m", path)));
 		}
 	}
+	if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		RegisterSessionRelation(reln, forkNum);
 
 	pfree(path);
 
@@ -465,6 +537,21 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 
 	if (fd < 0)
 	{
+		/*
+		 * In case of session relation access, there may be no yet files of this relation for this backend.
+		 * If so, then create file and register session relation for truncation on backend exit.
+		 */
+		if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
+			fd = PathNameOpenFile(path, O_RDWR | PG_BINARY | O_CREAT);
+			if (fd >= 0)
+			{
+				RegisterSessionRelation(reln, forknum);
+				if (!(behavior & EXTENSION_RETURN_NULL))
+					RegisterOnCommitAction(reln, forknum);
+				goto NewSegment;
+			}
+		}
 		if ((behavior & EXTENSION_RETURN_NULL) &&
 			FILE_POSSIBLY_DELETED(errno))
 		{
@@ -476,6 +563,7 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 				 errmsg("could not open file \"%s\": %m", path)));
 	}
 
+  NewSegment:
 	pfree(path);
 
 	_fdvec_resize(reln, forknum, 1);
@@ -652,8 +740,13 @@ mdread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
 		 * complaining.  This allows, for example, the case of trying to
 		 * update a block that was later truncated away.
 		 */
-		if (zero_damaged_pages || InRecovery)
+		if (zero_damaged_pages || InRecovery || RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
 			MemSet(buffer, 0, BLCKSZ);
+			/* In case of session relation we need to write zero page to provide correct result of subsequent mdnblocks */
+			if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+				mdwrite(reln, forknum, blocknum, buffer, true);
+		}
 		else
 			ereport(ERROR,
 					(errcode(ERRCODE_DATA_CORRUPTED),
@@ -743,7 +836,8 @@ mdnblocks(SMgrRelation reln, ForkNumber forknum)
 	BlockNumber segno = 0;
 
 	/* mdopen has opened the first segment */
-	Assert(reln->md_num_open_segs[forknum] > 0);
+	if (reln->md_num_open_segs[forknum] == 0)
+		return 0;
 
 	/*
 	 * Start from the last open segments, to avoid redundant seeks.  We have
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index a87e721..2401361 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -994,6 +994,9 @@ pg_relation_filepath(PG_FUNCTION_ARGS)
 	/* Determine owning backend. */
 	switch (relform->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/utils/cache/catcache.c b/src/backend/utils/cache/catcache.c
index c3e7d94..720dd52 100644
--- a/src/backend/utils/cache/catcache.c
+++ b/src/backend/utils/cache/catcache.c
@@ -1191,6 +1191,110 @@ SearchCatCache4(CatCache *cache,
 	return SearchCatCacheInternal(cache, 4, v1, v2, v3, v4);
 }
 
+
+void InsertCatCache(CatCache *cache,
+					Datum v1, Datum v2, Datum v3, Datum v4,
+					HeapTuple tuple)
+{
+	Datum		arguments[CATCACHE_MAXKEYS];
+	uint32		hashValue;
+	Index		hashIndex;
+	CatCTup    *ct;
+	dlist_iter	iter;
+	dlist_head *bucket;
+	int         nkeys = cache->cc_nkeys;
+	MemoryContext oldcxt;
+
+	/*
+	 * one-time startup overhead for each cache
+	 */
+	if (unlikely(cache->cc_tupdesc == NULL))
+		CatalogCacheInitializeCache(cache);
+
+	/* Initialize local parameter array */
+	arguments[0] = v1;
+	arguments[1] = v2;
+	arguments[2] = v3;
+	arguments[3] = v4;
+	/*
+	 * find the hash bucket in which to look for the tuple
+	 */
+	hashValue = CatalogCacheComputeHashValue(cache, nkeys, v1, v2, v3, v4);
+	hashIndex = HASH_INDEX(hashValue, cache->cc_nbuckets);
+
+	/*
+	 * scan the hash bucket until we find a match or exhaust our tuples
+	 *
+	 * Note: it's okay to use dlist_foreach here, even though we modify the
+	 * dlist within the loop, because we don't continue the loop afterwards.
+	 */
+	bucket = &cache->cc_bucket[hashIndex];
+	dlist_foreach(iter, bucket)
+	{
+		ct = dlist_container(CatCTup, cache_elem, iter.cur);
+
+		if (ct->dead)
+			continue;			/* ignore dead entries */
+
+		if (ct->hash_value != hashValue)
+			continue;			/* quickly skip entry if wrong hash val */
+
+		if (!CatalogCacheCompareTuple(cache, nkeys, ct->keys, arguments))
+			continue;
+
+		/*
+		 * If it's a positive entry, bump its refcount and return it. If it's
+		 * negative, we can report failure to the caller.
+		 */
+		if (ct->tuple.t_len == tuple->t_len)
+		{
+			memcpy((char *) ct->tuple.t_data,
+				   (const char *) tuple->t_data,
+				   tuple->t_len);
+			return;
+		}
+		dlist_delete(&ct->cache_elem);
+		pfree(ct);
+		cache->cc_ntup -= 1;
+		CacheHdr->ch_ntup -= 1;
+		break;
+	}
+	/* Allocate memory for CatCTup and the cached tuple in one go */
+	oldcxt = MemoryContextSwitchTo(CacheMemoryContext);
+
+	ct = (CatCTup *) palloc(sizeof(CatCTup) +
+							MAXIMUM_ALIGNOF + tuple->t_len);
+	ct->tuple.t_len = tuple->t_len;
+	ct->tuple.t_self = tuple->t_self;
+	ct->tuple.t_tableOid = tuple->t_tableOid;
+	ct->tuple.t_data = (HeapTupleHeader)
+		MAXALIGN(((char *) ct) + sizeof(CatCTup));
+	/* copy tuple contents */
+	memcpy((char *) ct->tuple.t_data,
+		   (const char *) tuple->t_data,
+		   tuple->t_len);
+	ct->ct_magic = CT_MAGIC;
+	ct->my_cache = cache;
+	ct->c_list = NULL;
+	ct->refcount = 1;			/* pinned*/
+	ct->dead = false;
+	ct->negative = false;
+	ct->hash_value = hashValue;
+	dlist_push_head(&cache->cc_bucket[hashIndex], &ct->cache_elem);
+	memcpy(ct->keys, arguments, nkeys*sizeof(Datum));
+
+	cache->cc_ntup++;
+	CacheHdr->ch_ntup++;
+	MemoryContextSwitchTo(oldcxt);
+
+	/*
+	 * If the hash table has become too full, enlarge the buckets array. Quite
+	 * arbitrarily, we enlarge when fill factor > 2.
+	 */
+	if (cache->cc_ntup > cache->cc_nbuckets * 2)
+		RehashCatCache(cache);
+}
+
 /*
  * Work-horse for SearchCatCache/SearchCatCacheN.
  */
diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c
index 585dcee..ce8852c 100644
--- a/src/backend/utils/cache/relcache.c
+++ b/src/backend/utils/cache/relcache.c
@@ -1098,6 +1098,10 @@ RelationBuildDesc(Oid targetRelId, bool insertIt)
 	relation->rd_newRelfilenodeSubid = InvalidSubTransactionId;
 	switch (relation->rd_rel->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			relation->rd_backend = BackendIdForSessionRelations();
+			relation->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			relation->rd_backend = InvalidBackendId;
@@ -3301,6 +3305,10 @@ RelationBuildLocalRelation(const char *relname,
 	rel->rd_rel->relpersistence = relpersistence;
 	switch (relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			rel->rd_backend = BackendIdForSessionRelations();
+			rel->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			rel->rd_backend = InvalidBackendId;
diff --git a/src/backend/utils/cache/syscache.c b/src/backend/utils/cache/syscache.c
index 16297a5..e7a4d3c 100644
--- a/src/backend/utils/cache/syscache.c
+++ b/src/backend/utils/cache/syscache.c
@@ -1164,6 +1164,16 @@ SearchSysCache4(int cacheId,
 	return SearchCatCache4(SysCache[cacheId], key1, key2, key3, key4);
 }
 
+void
+InsertSysCache(int cacheId,
+			   Datum key1, Datum key2, Datum key3, Datum key4,
+			   HeapTuple value)
+{
+	Assert(cacheId >= 0 && cacheId < SysCacheSize &&
+		   PointerIsValid(SysCache[cacheId]));
+	InsertCatCache(SysCache[cacheId], key1, key2, key3, key4, value);
+}
+
 /*
  * ReleaseSysCache
  *		Release previously grabbed reference count on a tuple
diff --git a/src/backend/utils/fmgr/funcapi.c b/src/backend/utils/fmgr/funcapi.c
index 4688fbc..9e49d4e 100644
--- a/src/backend/utils/fmgr/funcapi.c
+++ b/src/backend/utils/fmgr/funcapi.c
@@ -18,6 +18,7 @@
 #include "catalog/namespace.h"
 #include "catalog/pg_proc.h"
 #include "catalog/pg_type.h"
+#include "catalog/pg_statistic_d.h"
 #include "funcapi.h"
 #include "nodes/nodeFuncs.h"
 #include "parser/parse_coerce.h"
@@ -341,7 +342,8 @@ internal_get_result_type(Oid funcid,
 
 		if (resolve_polymorphic_tupdesc(tupdesc,
 										&procform->proargtypes,
-										call_expr))
+										call_expr) ||
+			funcid == GttStatisticFunctionId)
 		{
 			if (tupdesc->tdtypeid == RECORDOID &&
 				tupdesc->tdtypmod < 0)
diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
index bf69adc..fa7479c 100644
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -15637,8 +15637,8 @@ dumpTableSchema(Archive *fout, TableInfo *tbinfo)
 											 tbinfo->dobj.catId.oid, false);
 
 		appendPQExpBuffer(q, "CREATE %s%s %s",
-						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ?
-						  "UNLOGGED " : "",
+						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ? "UNLOGGED "
+						  : tbinfo->relpersistence == RELPERSISTENCE_SESSION ? "SESSION " : "",
 						  reltypename,
 						  qualrelname);
 
diff --git a/src/common/relpath.c b/src/common/relpath.c
index 62b9553..cef99d2 100644
--- a/src/common/relpath.c
+++ b/src/common/relpath.c
@@ -166,7 +166,18 @@ GetRelationPath(Oid dbNode, Oid spcNode, Oid relNode,
 		}
 		else
 		{
-			if (forkNumber != MAIN_FORKNUM)
+			/*
+			 * Session relations are distinguished from local temp relations by adding
+			 * SessionRelFirstBackendId offset to backendId.
+			 * These is no need to separate them at file system level, so just subtract SessionRelFirstBackendId
+			 * to avoid too long file names.
+			 * Segments of session relations have the same prefix (t%d_) as local temporary relations
+			 * to make it possible to cleanup them in the same way as local temporary relation files.
+			 */
+			 if (backendId >= SessionRelFirstBackendId)
+				 backendId -= SessionRelFirstBackendId;
+
+			 if (forkNumber != MAIN_FORKNUM)
 				path = psprintf("base/%u/t%d_%u_%s",
 								dbNode, backendId, relNode,
 								forkNames[forkNumber]);
diff --git a/src/include/catalog/pg_class.h b/src/include/catalog/pg_class.h
index 090b6ba..6a39663 100644
--- a/src/include/catalog/pg_class.h
+++ b/src/include/catalog/pg_class.h
@@ -165,6 +165,7 @@ typedef FormData_pg_class *Form_pg_class;
 #define		  RELPERSISTENCE_PERMANENT	'p' /* regular table */
 #define		  RELPERSISTENCE_UNLOGGED	'u' /* unlogged permanent table */
 #define		  RELPERSISTENCE_TEMP		't' /* temporary table */
+#define		  RELPERSISTENCE_SESSION	's' /* session table */
 
 /* default selection for replica identity (primary key or nothing) */
 #define		  REPLICA_IDENTITY_DEFAULT	'd'
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 58ea5b9..082c380 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -5476,7 +5476,14 @@
   proname => 'pg_stat_get_xact_function_self_time', provolatile => 'v',
   proparallel => 'r', prorettype => 'float8', proargtypes => 'oid',
   prosrc => 'pg_stat_get_xact_function_self_time' },
-
+{ oid => '3434',
+  descr => 'show local statistics for global temp table',
+  proname => 'pg_gtt_statistic_for_relation', provolatile => 'v', proparallel => 'u',
+  prorettype => 'record', proretset => 't', proargtypes => 'oid',
+  proallargtypes => '{oid,oid,int2,bool,float4,int4,float4,int2,int2,int2,int2,int2,oid,oid,oid,oid,oid,oid,oid,oid,oid,oid,_float4,_float4,_float4,_float4,_float4,anyarray,anyarray,anyarray,anyarray,anyarray}',
+  proargmodes => '{i,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o}',
+  proargnames => '{relid,starelid,staattnum,stainherit,stanullfrac,stawidth,stadistinct,stakind1,stakind2,stakind3,stakind4,stakind5,staop1,staop2,staop3,staop4,staop5,stacoll1,stacoll2,stacoll3,stacoll4,stacoll5,stanumbers1,stanumbers2,stanumbers3,stanumbers4,stanumbers5,stavalues1,stavalues2,stavalues3,stavalues4,stavalues5}',
+  prosrc => 'pg_gtt_statistic_for_relation' },
 { oid => '3788',
   descr => 'statistics: timestamp of the current statistics snapshot',
   proname => 'pg_stat_get_snapshot_timestamp', provolatile => 's',
diff --git a/src/include/storage/backendid.h b/src/include/storage/backendid.h
index 70ef8eb..11b4b89 100644
--- a/src/include/storage/backendid.h
+++ b/src/include/storage/backendid.h
@@ -22,6 +22,13 @@ typedef int BackendId;			/* unique currently active backend identifier */
 
 #define InvalidBackendId		(-1)
 
+/*
+ * We need to distinguish local and global temporary relations by RelFileNodeBackend.
+ * The least invasive change is to add some special bias value to backend id (since 
+ * maximal number of backed is limited by MaxBackends).
+ */
+#define SessionRelFirstBackendId (0x40000000)
+
 extern PGDLLIMPORT BackendId MyBackendId;	/* backend id of this backend */
 
 /* backend id of our parallel session leader, or InvalidBackendId if none */
@@ -34,4 +41,12 @@ extern PGDLLIMPORT BackendId ParallelMasterBackendId;
 #define BackendIdForTempRelations() \
 	(ParallelMasterBackendId == InvalidBackendId ? MyBackendId : ParallelMasterBackendId)
 
+
+#define BackendIdForSessionRelations() \
+	(BackendIdForTempRelations() + SessionRelFirstBackendId)
+
+#define IsSessionRelationBackendId(id) ((id) >= SessionRelFirstBackendId)
+
+#define GetRelationBackendId(id) ((id) & ~SessionRelFirstBackendId)
+
 #endif							/* BACKENDID_H */
diff --git a/src/include/storage/bufpage.h b/src/include/storage/bufpage.h
index 4ef6d8d..bac7a31 100644
--- a/src/include/storage/bufpage.h
+++ b/src/include/storage/bufpage.h
@@ -229,6 +229,13 @@ typedef PageHeaderData *PageHeader;
 #define PageIsNew(page) (((PageHeader) (page))->pd_upper == 0)
 
 /*
+ * Page of temporary relation is not initialized
+ */
+#define GlobalTempRelationPageIsNotInitialized(rel, page) \
+	((rel)->rd_rel->relpersistence == RELPERSISTENCE_SESSION && PageIsNew(page))
+
+
+/*
  * PageGetItemId
  *		Returns an item identifier of a page.
  */
diff --git a/src/include/storage/relfilenode.h b/src/include/storage/relfilenode.h
index 586500a..20aec72 100644
--- a/src/include/storage/relfilenode.h
+++ b/src/include/storage/relfilenode.h
@@ -75,10 +75,25 @@ typedef struct RelFileNodeBackend
 	BackendId	backend;
 } RelFileNodeBackend;
 
+/*
+ * Check whether it is local or global temporary relation, which data belongs only to one backend.
+ */
 #define RelFileNodeBackendIsTemp(rnode) \
 	((rnode).backend != InvalidBackendId)
 
 /*
+ * Check whether it is global temporary relation which metadata is shared by all sessions,
+ * but data is private for the current session.
+ */
+#define RelFileNodeBackendIsGlobalTemp(rnode) IsSessionRelationBackendId((rnode).backend)
+
+/*
+ * Check whether it is local temporary relation which exists only in this backend.
+ */
+#define RelFileNodeBackendIsLocalTemp(rnode) \
+	(RelFileNodeBackendIsTemp(rnode) && !RelFileNodeBackendIsGlobalTemp(rnode))
+
+/*
  * Note: RelFileNodeEquals and RelFileNodeBackendEquals compare relNode first
  * since that is most likely to be different in two unequal RelFileNodes.  It
  * is probably redundant to compare spcNode if the other fields are found equal,
diff --git a/src/include/utils/catcache.h b/src/include/utils/catcache.h
index ff1faba..31f615d 100644
--- a/src/include/utils/catcache.h
+++ b/src/include/utils/catcache.h
@@ -228,4 +228,8 @@ extern void PrepareToInvalidateCacheTuple(Relation relation,
 extern void PrintCatCacheLeakWarning(HeapTuple tuple);
 extern void PrintCatCacheListLeakWarning(CatCList *list);
 
+extern void InsertCatCache(CatCache *cache,
+						   Datum v1, Datum v2, Datum v3, Datum v4,
+						   HeapTuple tuple);
+
 #endif							/* CATCACHE_H */
diff --git a/src/include/utils/rel.h b/src/include/utils/rel.h
index a5cf804..a30137f 100644
--- a/src/include/utils/rel.h
+++ b/src/include/utils/rel.h
@@ -272,6 +272,7 @@ typedef struct StdRdOptions
 	int			parallel_workers;	/* max number of parallel workers */
 	bool		vacuum_index_cleanup;	/* enables index vacuuming and cleanup */
 	bool		vacuum_truncate;	/* enables vacuum to truncate a relation */
+	bool		on_commit_delete_rows;	/* global temp table */
 } StdRdOptions;
 
 #define HEAP_MIN_FILLFACTOR			10
@@ -327,6 +328,18 @@ typedef struct StdRdOptions
 	((relation)->rd_options ? \
 	 ((StdRdOptions *) (relation)->rd_options)->parallel_workers : (defaultpw))
 
+/*
+ * Relation persistence is either TEMP either SESSION
+ */
+#define IsLocalRelpersistence(relpersistence) \
+	((relpersistence) == RELPERSISTENCE_TEMP || (relpersistence) == RELPERSISTENCE_SESSION)
+
+/*
+ * Relation is either global either local temp table
+ */
+#define RelationHasSessionScope(relation) \
+	IsLocalRelpersistence(((relation)->rd_rel->relpersistence))
+
 /* ViewOptions->check_option values */
 typedef enum ViewOptCheckOption
 {
@@ -335,6 +348,7 @@ typedef enum ViewOptCheckOption
 	VIEW_OPTION_CHECK_OPTION_CASCADED
 } ViewOptCheckOption;
 
+
 /*
  * ViewOptions
  *		Contents of rd_options for views
@@ -526,7 +540,7 @@ typedef struct ViewOptions
  *		True if relation's pages are stored in local buffers.
  */
 #define RelationUsesLocalBuffers(relation) \
-	((relation)->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
+	RelationHasSessionScope(relation)
 
 /*
  * RELATION_IS_LOCAL
diff --git a/src/include/utils/syscache.h b/src/include/utils/syscache.h
index 918765c..5b1598b 100644
--- a/src/include/utils/syscache.h
+++ b/src/include/utils/syscache.h
@@ -216,4 +216,8 @@ extern bool RelationSupportsSysCache(Oid relid);
 
 #define ReleaseSysCacheList(x)	ReleaseCatCacheList(x)
 
+
+extern void InsertSysCache(int cacheId, 
+						   Datum v1, Datum v2, Datum v3, Datum v4,
+						   HeapTuple tuple);
 #endif							/* SYSCACHE_H */
diff --git a/src/test/isolation/expected/inherit-global-temp.out b/src/test/isolation/expected/inherit-global-temp.out
new file mode 100644
index 0000000..6114f8c
--- /dev/null
+++ b/src/test/isolation/expected/inherit-global-temp.out
@@ -0,0 +1,218 @@
+Parsed test spec with 2 sessions
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_update_p s1_update_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_update_p: UPDATE inh_global_parent SET a = 11 WHERE a = 1;
+step s1_update_c: UPDATE inh_global_parent SET a = 13 WHERE a IN (3, 5);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+2              
+11             
+4              
+13             
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+4              
+13             
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+2              
+11             
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_update_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_update_c: UPDATE inh_global_parent SET a = 15 WHERE a IN (3, 5);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+6              
+15             
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+6              
+15             
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_delete_p s1_delete_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_delete_p: DELETE FROM inh_global_parent WHERE a = 2;
+step s1_delete_c: DELETE FROM inh_global_parent WHERE a IN (4, 6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+3              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_delete_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_delete_c: DELETE FROM inh_global_parent WHERE a IN (4, 6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+5              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_truncate_p s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_truncate_p s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_truncate_p: TRUNCATE inh_global_parent;
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_begin s1_truncate_p s2_select_p s1_commit
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_begin: BEGIN;
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s2_select_p: SELECT a FROM inh_global_parent; <waiting ...>
+step s1_commit: COMMIT;
+step s2_select_p: <... completed>
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_begin s1_truncate_p s2_select_c s1_commit
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_begin: BEGIN;
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2; <waiting ...>
+step s1_commit: COMMIT;
+step s2_select_c: <... completed>
+a              
+
+5              
+6              
diff --git a/src/test/isolation/isolation_schedule b/src/test/isolation/isolation_schedule
index a2fa192..ef7aa85 100644
--- a/src/test/isolation/isolation_schedule
+++ b/src/test/isolation/isolation_schedule
@@ -88,3 +88,4 @@ test: plpgsql-toast
 test: truncate-conflict
 test: serializable-parallel
 test: serializable-parallel-2
+test: inherit-global-temp
diff --git a/src/test/isolation/specs/inherit-global-temp.spec b/src/test/isolation/specs/inherit-global-temp.spec
new file mode 100644
index 0000000..5e95dd6
--- /dev/null
+++ b/src/test/isolation/specs/inherit-global-temp.spec
@@ -0,0 +1,73 @@
+# This is a copy of the inherit-temp test with little changes for global temporary tables.
+#
+
+setup
+{
+  CREATE TABLE inh_global_parent (a int);
+}
+
+teardown
+{
+  DROP TABLE inh_global_parent;
+}
+
+# Session 1 executes actions which act directly on both the parent and
+# its child.  Abbreviation "c" is used for queries working on the child
+# and "p" on the parent.
+session "s1"
+setup
+{
+  CREATE GLOBAL TEMPORARY TABLE inh_global_temp_child_s1 () INHERITS (inh_global_parent);
+}
+step "s1_begin" { BEGIN; }
+step "s1_truncate_p" { TRUNCATE inh_global_parent; }
+step "s1_select_p" { SELECT a FROM inh_global_parent; }
+step "s1_select_c" { SELECT a FROM inh_global_temp_child_s1; }
+step "s1_insert_p" { INSERT INTO inh_global_parent VALUES (1), (2); }
+step "s1_insert_c" { INSERT INTO inh_global_temp_child_s1 VALUES (3), (4); }
+step "s1_update_p" { UPDATE inh_global_parent SET a = 11 WHERE a = 1; }
+step "s1_update_c" { UPDATE inh_global_parent SET a = 13 WHERE a IN (3, 5); }
+step "s1_delete_p" { DELETE FROM inh_global_parent WHERE a = 2; }
+step "s1_delete_c" { DELETE FROM inh_global_parent WHERE a IN (4, 6); }
+step "s1_commit" { COMMIT; }
+teardown
+{
+  DROP TABLE inh_global_temp_child_s1;
+}
+
+# Session 2 executes actions on the parent which act only on the child.
+session "s2"
+setup
+{
+  CREATE GLOBAL TEMPORARY TABLE inh_global_temp_child_s2 () INHERITS (inh_global_parent);
+}
+step "s2_truncate_p" { TRUNCATE inh_global_parent; }
+step "s2_select_p" { SELECT a FROM inh_global_parent; }
+step "s2_select_c" { SELECT a FROM inh_global_temp_child_s2; }
+step "s2_insert_c" { INSERT INTO inh_global_temp_child_s2 VALUES (5), (6); }
+step "s2_update_c" { UPDATE inh_global_parent SET a = 15 WHERE a IN (3, 5); }
+step "s2_delete_c" { DELETE FROM inh_global_parent WHERE a IN (4, 6); }
+teardown
+{
+  DROP TABLE inh_global_temp_child_s2;
+}
+
+# Check INSERT behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check UPDATE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_update_p" "s1_update_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_update_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check DELETE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_delete_p" "s1_delete_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_delete_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check TRUNCATE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_truncate_p" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_truncate_p" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# TRUNCATE on a parent tree does not block access to temporary child relation
+# of another session, and blocks when scanning the parent.
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_begin" "s1_truncate_p" "s2_select_p" "s1_commit"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_begin" "s1_truncate_p" "s2_select_c" "s1_commit"
diff --git a/src/test/regress/expected/global_temp.out b/src/test/regress/expected/global_temp.out
new file mode 100644
index 0000000..ae1adb6
--- /dev/null
+++ b/src/test/regress/expected/global_temp.out
@@ -0,0 +1,247 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+-- Test ON COMMIT DELETE ROWS
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+   2
+(2 rows)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+(1 row)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+ col 
+-----
+   1
+(1 row)
+
+SELECT * FROM global_temptest2;
+ col 
+-----
+(0 rows)
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+ERROR:  unsupported ON COMMIT and foreign key combination
+DETAIL:  Table "global_temptest4" references "global_temptest3", but they do not have the same ON COMMIT setting.
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+ a 
+---
+(0 rows)
+
+DROP TABLE temp_parted_oncommit;
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+              relname              
+-----------------------------------
+ global_temp_parted_oncommit_test
+ global_temp_parted_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_parted_oncommit_test;
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+            relname             
+--------------------------------
+ global_temp_inh_oncommit_test
+ global_temp_inh_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ERROR:  cannot inherit from temporary relation "global_temp_table"
+ROLLBACK;
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM global_temp_table;
+ a 
+---
+ 1
+(1 row)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+(2 rows)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       1
+(1 row)
+
+\c
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+(0 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       2
+(1 row)
+
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       3
+(1 row)
+
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
diff --git a/src/test/regress/expected/session_table.out b/src/test/regress/expected/session_table.out
new file mode 100644
index 0000000..1b9b3f4
--- /dev/null
+++ b/src/test/regress/expected/session_table.out
@@ -0,0 +1,64 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+ count 
+-------
+ 10000
+(1 row)
+
+\c
+select count(*) from my_private_table;
+ count 
+-------
+     0
+(1 row)
+
+select * from my_private_table where x=10001;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select * from my_private_table where y=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select count(*) from my_private_table;
+ count  
+--------
+ 100000
+(1 row)
+
+\c
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+   x    |   y    
+--------+--------
+ 100000 | 100000
+(1 row)
+
+drop table  my_private_table;
diff --git a/src/test/regress/parallel_schedule b/src/test/regress/parallel_schedule
index fc0f141..507cf7d 100644
--- a/src/test/regress/parallel_schedule
+++ b/src/test/regress/parallel_schedule
@@ -107,7 +107,7 @@ test: json jsonb json_encoding jsonpath jsonpath_encoding jsonb_jsonpath
 # NB: temp.sql does a reconnect which transiently uses 2 connections,
 # so keep this parallel group to at most 19 tests
 # ----------
-test: plancache limit plpgsql copy2 temp domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
+test: plancache limit plpgsql copy2 temp global_temp session_table domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
 
 # ----------
 # Another group of parallel tests
diff --git a/src/test/regress/serial_schedule b/src/test/regress/serial_schedule
index 68ac56a..3890777 100644
--- a/src/test/regress/serial_schedule
+++ b/src/test/regress/serial_schedule
@@ -172,6 +172,8 @@ test: limit
 test: plpgsql
 test: copy2
 test: temp
+test: global_temp
+test: session_table
 test: domain
 test: rangefuncs
 test: prepare
diff --git a/src/test/regress/sql/global_temp.sql b/src/test/regress/sql/global_temp.sql
new file mode 100644
index 0000000..3058b9b
--- /dev/null
+++ b/src/test/regress/sql/global_temp.sql
@@ -0,0 +1,151 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+
+-- Test ON COMMIT DELETE ROWS
+
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+SELECT * FROM global_temptest2;
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+DROP TABLE temp_parted_oncommit;
+
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+DROP TABLE global_temp_parted_oncommit_test;
+
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ROLLBACK;
+
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+COMMIT;
+SELECT * FROM global_temp_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+COMMIT;
+SELECT * FROM normal_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+\c
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
diff --git a/src/test/regress/sql/session_table.sql b/src/test/regress/sql/session_table.sql
new file mode 100644
index 0000000..c6663dc
--- /dev/null
+++ b/src/test/regress/sql/session_table.sql
@@ -0,0 +1,18 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+\c
+select count(*) from my_private_table;
+select * from my_private_table where x=10001;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+select * from my_private_table where y=10001;
+select count(*) from my_private_table;
+\c
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+drop table  my_private_table;

diff --git a/src/backend/access/brin/brin.c b/src/backend/access/brin/brin.c
index 294ffa6..4e3eceb 100644
--- a/src/backend/access/brin/brin.c
+++ b/src/backend/access/brin/brin.c
@@ -672,7 +672,7 @@ brinbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	/*
 	 * We expect to be called exactly once for any index relation.
 	 */
-	if (RelationGetNumberOfBlocks(index) != 0)
+	if (RelationGetNumberOfBlocks(index) != 0 && index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
 		elog(ERROR, "index \"%s\" already contains data",
 			 RelationGetRelationName(index));
 
@@ -681,9 +681,17 @@ brinbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	 * whole relation will be rolled back.
 	 */
 
-	meta = ReadBuffer(index, P_NEW);
-	Assert(BufferGetBlockNumber(meta) == BRIN_METAPAGE_BLKNO);
-	LockBuffer(meta, BUFFER_LOCK_EXCLUSIVE);
+	if (index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
+	{
+		meta = ReadBuffer(index, P_NEW);
+		Assert(BufferGetBlockNumber(meta) == BRIN_METAPAGE_BLKNO);
+		LockBuffer(meta, BUFFER_LOCK_EXCLUSIVE);
+	}
+	else
+	{
+		meta = ReadBuffer(index, BRIN_METAPAGE_BLKNO);
+		LockBuffer(meta, BUFFER_LOCK_SHARE);
+	}
 
 	brin_metapage_init(BufferGetPage(meta), BrinGetPagesPerRange(index),
 					   BRIN_CURRENT_VERSION);
diff --git a/src/backend/access/brin/brin_revmap.c b/src/backend/access/brin/brin_revmap.c
index 647350c..d432fec 100644
--- a/src/backend/access/brin/brin_revmap.c
+++ b/src/backend/access/brin/brin_revmap.c
@@ -25,8 +25,10 @@
 #include "access/brin_revmap.h"
 #include "access/brin_tuple.h"
 #include "access/brin_xlog.h"
+#include "access/brin.h"
 #include "access/rmgr.h"
 #include "access/xloginsert.h"
+#include "catalog/index.h"
 #include "miscadmin.h"
 #include "storage/bufmgr.h"
 #include "storage/lmgr.h"
@@ -79,6 +81,13 @@ brinRevmapInitialize(Relation idxrel, BlockNumber *pagesPerRange,
 	meta = ReadBuffer(idxrel, BRIN_METAPAGE_BLKNO);
 	LockBuffer(meta, BUFFER_LOCK_SHARE);
 	page = BufferGetPage(meta);
+
+	if (GlobalTempRelationPageIsNotInitialized(idxrel, page))
+	{
+		Relation heap = RelationIdGetRelation(idxrel->rd_index->indrelid);
+		brinbuild(heap, idxrel, BuildIndexInfo(idxrel));
+		RelationClose(heap);
+	}
 	TestForOldSnapshot(snapshot, idxrel, page);
 	metadata = (BrinMetaPageData *) PageGetContents(page);
 
diff --git a/src/backend/access/common/reloptions.c b/src/backend/access/common/reloptions.c
index 48377ac..3b3bbc1 100644
--- a/src/backend/access/common/reloptions.c
+++ b/src/backend/access/common/reloptions.c
@@ -158,6 +158,19 @@ static relopt_bool boolRelOpts[] =
 		},
 		true
 	},
+	/*
+	 * For global temp table only
+	 * use AccessExclusiveLock for ensure safety
+	 */
+	{
+		{
+			"on_commit_delete_rows",
+			"global temp table on commit options",
+			RELOPT_KIND_HEAP | RELOPT_KIND_PARTITIONED,
+			ShareUpdateExclusiveLock
+		},
+		false
+	},
 	/* list terminator */
 	{{NULL}}
 };
@@ -1486,6 +1499,8 @@ bytea *
 default_reloptions(Datum reloptions, bool validate, relopt_kind kind)
 {
 	static const relopt_parse_elt tab[] = {
+		{"on_commit_delete_rows", RELOPT_TYPE_BOOL,
+		offsetof(StdRdOptions, on_commit_delete_rows)},
 		{"fillfactor", RELOPT_TYPE_INT, offsetof(StdRdOptions, fillfactor)},
 		{"autovacuum_enabled", RELOPT_TYPE_BOOL,
 		offsetof(StdRdOptions, autovacuum) + offsetof(AutoVacOpts, enabled)},
@@ -1586,13 +1601,17 @@ build_reloptions(Datum reloptions, bool validate,
 bytea *
 partitioned_table_reloptions(Datum reloptions, bool validate)
 {
+	static const relopt_parse_elt tab[] = {
+		{"on_commit_delete_rows", RELOPT_TYPE_BOOL,
+		offsetof(StdRdOptions, on_commit_delete_rows)}
+	};
 	/*
 	 * There are no options for partitioned tables yet, but this is able to do
 	 * some validation.
 	 */
 	return (bytea *) build_reloptions(reloptions, validate,
 									  RELOPT_KIND_PARTITIONED,
-									  0, NULL, 0);
+									  sizeof(StdRdOptions), tab, lengthof(tab));
 }
 
 /*
diff --git a/src/backend/access/gin/ginfast.c b/src/backend/access/gin/ginfast.c
index 3d2153b..06c7f7a 100644
--- a/src/backend/access/gin/ginfast.c
+++ b/src/backend/access/gin/ginfast.c
@@ -22,6 +22,8 @@
 #include "access/ginxlog.h"
 #include "access/xlog.h"
 #include "access/xloginsert.h"
+#include "commands/vacuum.h"
+#include "catalog/index.h"
 #include "catalog/pg_am.h"
 #include "commands/vacuum.h"
 #include "miscadmin.h"
@@ -241,6 +243,13 @@ ginHeapTupleFastInsert(GinState *ginstate, GinTupleCollector *collector)
 	metabuffer = ReadBuffer(index, GIN_METAPAGE_BLKNO);
 	metapage = BufferGetPage(metabuffer);
 
+	if (GlobalTempRelationPageIsNotInitialized(index, metapage))
+	{
+		Relation heap = RelationIdGetRelation(index->rd_index->indrelid);
+		ginbuild(heap, index, BuildIndexInfo(index));
+		RelationClose(heap);
+	}
+
 	/*
 	 * An insertion to the pending list could logically belong anywhere in the
 	 * tree, so it conflicts with all serializable scans.  All scans acquire a
diff --git a/src/backend/access/gin/ginget.c b/src/backend/access/gin/ginget.c
index b18ae2b..2e447be 100644
--- a/src/backend/access/gin/ginget.c
+++ b/src/backend/access/gin/ginget.c
@@ -16,6 +16,7 @@
 
 #include "access/gin_private.h"
 #include "access/relscan.h"
+#include "catalog/index.h"
 #include "miscadmin.h"
 #include "storage/predicate.h"
 #include "utils/datum.h"
@@ -1759,7 +1760,8 @@ scanPendingInsert(IndexScanDesc scan, TIDBitmap *tbm, int64 *ntids)
 				match;
 	int			i;
 	pendingPosition pos;
-	Buffer		metabuffer = ReadBuffer(scan->indexRelation, GIN_METAPAGE_BLKNO);
+	Relation    index = scan->indexRelation;
+	Buffer		metabuffer = ReadBuffer(index, GIN_METAPAGE_BLKNO);
 	Page		page;
 	BlockNumber blkno;
 
@@ -1769,11 +1771,19 @@ scanPendingInsert(IndexScanDesc scan, TIDBitmap *tbm, int64 *ntids)
 	 * Acquire predicate lock on the metapage, to conflict with any fastupdate
 	 * insertions.
 	 */
-	PredicateLockPage(scan->indexRelation, GIN_METAPAGE_BLKNO, scan->xs_snapshot);
+	PredicateLockPage(index, GIN_METAPAGE_BLKNO, scan->xs_snapshot);
 
 	LockBuffer(metabuffer, GIN_SHARE);
 	page = BufferGetPage(metabuffer);
-	TestForOldSnapshot(scan->xs_snapshot, scan->indexRelation, page);
+	TestForOldSnapshot(scan->xs_snapshot, index, page);
+
+	if (GlobalTempRelationPageIsNotInitialized(index, page))
+	{
+		Relation heap = RelationIdGetRelation(index->rd_index->indrelid);
+		ginbuild(heap, index, BuildIndexInfo(index));
+		RelationClose(heap);
+		UnlockReleaseBuffer(metabuffer);
+	}
 	blkno = GinPageGetMeta(page)->head;
 
 	/*
@@ -1787,7 +1797,7 @@ scanPendingInsert(IndexScanDesc scan, TIDBitmap *tbm, int64 *ntids)
 		return;
 	}
 
-	pos.pendingBuffer = ReadBuffer(scan->indexRelation, blkno);
+	pos.pendingBuffer = ReadBuffer(index, blkno);
 	LockBuffer(pos.pendingBuffer, GIN_SHARE);
 	pos.firstOffset = FirstOffsetNumber;
 	UnlockReleaseBuffer(metabuffer);
diff --git a/src/backend/access/gin/gininsert.c b/src/backend/access/gin/gininsert.c
index 1ad6228..49d245c 100644
--- a/src/backend/access/gin/gininsert.c
+++ b/src/backend/access/gin/gininsert.c
@@ -329,7 +329,7 @@ ginbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	MemoryContext oldCtx;
 	OffsetNumber attnum;
 
-	if (RelationGetNumberOfBlocks(index) != 0)
+	if (RelationGetNumberOfBlocks(index) != 0 && index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
 		elog(ERROR, "index \"%s\" already contains data",
 			 RelationGetRelationName(index));
 
@@ -338,7 +338,15 @@ ginbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	memset(&buildstate.buildStats, 0, sizeof(GinStatsData));
 
 	/* initialize the meta page */
-	MetaBuffer = GinNewBuffer(index);
+	if (index->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
+	{
+		MetaBuffer = ReadBuffer(index, 0);
+		LockBuffer(MetaBuffer, GIN_SHARE);
+	}
+	else
+	{
+		MetaBuffer = GinNewBuffer(index);
+	}
 
 	/* initialize the root page */
 	RootBuffer = GinNewBuffer(index);
diff --git a/src/backend/access/gist/gist.c b/src/backend/access/gist/gist.c
index 3800f58..e9d1218 100644
--- a/src/backend/access/gist/gist.c
+++ b/src/backend/access/gist/gist.c
@@ -16,6 +16,7 @@
 
 #include "access/gist_private.h"
 #include "access/gistscan.h"
+#include "catalog/index.h"
 #include "catalog/pg_collation.h"
 #include "miscadmin.h"
 #include "nodes/execnodes.h"
@@ -676,7 +677,10 @@ gistdoinsert(Relation r, IndexTuple itup, Size freespace,
 		if (!xlocked)
 		{
 			LockBuffer(stack->buffer, GIST_SHARE);
-			gistcheckpage(state.r, stack->buffer);
+			if (stack->blkno == GIST_ROOT_BLKNO && GlobalTempRelationPageIsNotInitialized(state.r, BufferGetPage(stack->buffer)))
+				gistbuild(heapRel, r, BuildIndexInfo(r));
+			else
+				gistcheckpage(state.r, stack->buffer);
 		}
 
 		stack->page = (Page) BufferGetPage(stack->buffer);
diff --git a/src/backend/access/gist/gistbuild.c b/src/backend/access/gist/gistbuild.c
index 739846a..f35072b 100644
--- a/src/backend/access/gist/gistbuild.c
+++ b/src/backend/access/gist/gistbuild.c
@@ -156,7 +156,7 @@ gistbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	 * We expect to be called exactly once for any index relation. If that's
 	 * not the case, big trouble's what we have.
 	 */
-	if (RelationGetNumberOfBlocks(index) != 0)
+	if (RelationGetNumberOfBlocks(index) != 0 && index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
 		elog(ERROR, "index \"%s\" already contains data",
 			 RelationGetRelationName(index));
 
@@ -171,8 +171,16 @@ gistbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	buildstate.giststate->tempCxt = createTempGistContext();
 
 	/* initialize the root page */
-	buffer = gistNewBuffer(index);
-	Assert(BufferGetBlockNumber(buffer) == GIST_ROOT_BLKNO);
+	if (index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
+	{
+		buffer = gistNewBuffer(index);
+		Assert(BufferGetBlockNumber(buffer) == GIST_ROOT_BLKNO);
+	}
+	else
+	{
+		buffer = ReadBuffer(index, GIST_ROOT_BLKNO);
+		LockBuffer(buffer, GIST_SHARE);
+	}
 	page = BufferGetPage(buffer);
 
 	START_CRIT_SECTION();
diff --git a/src/backend/access/gist/gistget.c b/src/backend/access/gist/gistget.c
index 98b6892..90d4eaa 100644
--- a/src/backend/access/gist/gistget.c
+++ b/src/backend/access/gist/gistget.c
@@ -17,10 +17,12 @@
 #include "access/genam.h"
 #include "access/gist_private.h"
 #include "access/relscan.h"
+#include "catalog/index.h"
 #include "lib/pairingheap.h"
 #include "miscadmin.h"
 #include "pgstat.h"
 #include "storage/lmgr.h"
+#include "storage/freespace.h"
 #include "storage/predicate.h"
 #include "utils/float.h"
 #include "utils/memutils.h"
@@ -344,7 +346,10 @@ gistScanPage(IndexScanDesc scan, GISTSearchItem *pageItem,
 	buffer = ReadBuffer(scan->indexRelation, pageItem->blkno);
 	LockBuffer(buffer, GIST_SHARE);
 	PredicateLockPage(r, BufferGetBlockNumber(buffer), scan->xs_snapshot);
-	gistcheckpage(scan->indexRelation, buffer);
+	if (pageItem->blkno == GIST_ROOT_BLKNO && GlobalTempRelationPageIsNotInitialized(r, BufferGetPage(buffer)))
+		gistbuild(scan->heapRelation, r, BuildIndexInfo(r));
+	else
+		gistcheckpage(scan->indexRelation, buffer);
 	page = BufferGetPage(buffer);
 	TestForOldSnapshot(scan->xs_snapshot, r, page);
 	opaque = GistPageGetOpaque(page);
diff --git a/src/backend/access/gist/gistutil.c b/src/backend/access/gist/gistutil.c
index 553a6d6..581f4c2 100644
--- a/src/backend/access/gist/gistutil.c
+++ b/src/backend/access/gist/gistutil.c
@@ -1013,7 +1013,7 @@ gistGetFakeLSN(Relation rel)
 {
 	static XLogRecPtr counter = FirstNormalUnloggedLSN;
 
-	if (rel->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
+	if (RelationHasSessionScope(rel))
 	{
 		/*
 		 * Temporary relations are only accessible in our session, so a simple
diff --git a/src/backend/access/hash/hash.c b/src/backend/access/hash/hash.c
index a0597a0..56bd161 100644
--- a/src/backend/access/hash/hash.c
+++ b/src/backend/access/hash/hash.c
@@ -117,7 +117,7 @@ hashbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	 * We expect to be called exactly once for any index relation. If that's
 	 * not the case, big trouble's what we have.
 	 */
-	if (RelationGetNumberOfBlocks(index) != 0)
+	if (RelationGetNumberOfBlocks(index) != 0 && index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
 		elog(ERROR, "index \"%s\" already contains data",
 			 RelationGetRelationName(index));
 
diff --git a/src/backend/access/hash/hashpage.c b/src/backend/access/hash/hashpage.c
index f84cee8..1948ef7 100644
--- a/src/backend/access/hash/hashpage.c
+++ b/src/backend/access/hash/hashpage.c
@@ -30,6 +30,8 @@
 
 #include "access/hash.h"
 #include "access/hash_xlog.h"
+#include "catalog/index.h"
+#include "catalog/pg_am.h"
 #include "miscadmin.h"
 #include "storage/lmgr.h"
 #include "storage/predicate.h"
@@ -74,13 +76,22 @@ _hash_getbuf(Relation rel, BlockNumber blkno, int access, int flags)
 
 	buf = ReadBuffer(rel, blkno);
 
-	if (access != HASH_NOLOCK)
-		LockBuffer(buf, access);
-
 	/* ref count and lock type are correct */
 
-	_hash_checkpage(rel, buf, flags);
-
+	if (blkno == HASH_METAPAGE && GlobalTempRelationPageIsNotInitialized(rel, BufferGetPage(buf)))
+	{
+		Relation heap = RelationIdGetRelation(rel->rd_index->indrelid);
+		hashbuild(heap, rel, BuildIndexInfo(rel));
+		RelationClose(heap);
+		if (access != HASH_NOLOCK)
+			LockBuffer(buf, access);
+	}
+	else
+	{
+		if (access != HASH_NOLOCK)
+			LockBuffer(buf, access);
+		_hash_checkpage(rel, buf, flags);
+	}
 	return buf;
 }
 
@@ -338,7 +349,7 @@ _hash_init(Relation rel, double num_tuples, ForkNumber forkNum)
 	bool		use_wal;
 
 	/* safety check */
-	if (RelationGetNumberOfBlocksInFork(rel, forkNum) != 0)
+	if (rel->rd_rel->relpersistence != RELPERSISTENCE_SESSION && RelationGetNumberOfBlocksInFork(rel, forkNum) != 0)
 		elog(ERROR, "cannot initialize non-empty hash index \"%s\"",
 			 RelationGetRelationName(rel));
 
diff --git a/src/backend/access/heap/heapam_handler.c b/src/backend/access/heap/heapam_handler.c
index 92073fe..54533a3 100644
--- a/src/backend/access/heap/heapam_handler.c
+++ b/src/backend/access/heap/heapam_handler.c
@@ -670,6 +670,7 @@ heapam_relation_copy_data(Relation rel, const RelFileNode *newrnode)
 			 * init fork of an unlogged relation.
 			 */
 			if (rel->rd_rel->relpersistence == RELPERSISTENCE_PERMANENT ||
+				rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ||
 				(rel->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED &&
 				 forkNum == INIT_FORKNUM))
 				log_smgrcreate(newrnode, forkNum);
diff --git a/src/backend/access/nbtree/nbtpage.c b/src/backend/access/nbtree/nbtpage.c
index 268f869..eff9e10 100644
--- a/src/backend/access/nbtree/nbtpage.c
+++ b/src/backend/access/nbtree/nbtpage.c
@@ -27,8 +27,10 @@
 #include "access/transam.h"
 #include "access/xlog.h"
 #include "access/xloginsert.h"
+#include "catalog/index.h"
 #include "miscadmin.h"
 #include "storage/indexfsm.h"
+#include "storage/buf_internals.h"
 #include "storage/lmgr.h"
 #include "storage/predicate.h"
 #include "utils/snapmgr.h"
@@ -762,8 +764,22 @@ _bt_getbuf(Relation rel, BlockNumber blkno, int access)
 	{
 		/* Read an existing block of the relation */
 		buf = ReadBuffer(rel, blkno);
-		LockBuffer(buf, access);
-		_bt_checkpage(rel, buf);
+		/* Session temporary relation may be not yet initialized for this backend. */
+		if (blkno == BTREE_METAPAGE && GlobalTempRelationPageIsNotInitialized(rel, BufferGetPage(buf)))
+		{
+			Relation heap = RelationIdGetRelation(rel->rd_index->indrelid);
+			ReleaseBuffer(buf);
+			DropRelFileNodeLocalBuffers(rel->rd_node, MAIN_FORKNUM, blkno);
+			btbuild(heap, rel, BuildIndexInfo(rel));
+			RelationClose(heap);
+			buf = ReadBuffer(rel, blkno);
+			LockBuffer(buf, access);
+		}
+		else
+		{
+			LockBuffer(buf, access);
+			_bt_checkpage(rel, buf);
+		}
 	}
 	else
 	{
diff --git a/src/backend/access/nbtree/nbtsort.c b/src/backend/access/nbtree/nbtsort.c
index 1dd39a9..785b665 100644
--- a/src/backend/access/nbtree/nbtsort.c
+++ b/src/backend/access/nbtree/nbtsort.c
@@ -321,7 +321,7 @@ btbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 	 * We expect to be called exactly once for any index relation. If that's
 	 * not the case, big trouble's what we have.
 	 */
-	if (RelationGetNumberOfBlocks(index) != 0)
+	if (RelationGetNumberOfBlocks(index) != 0 && index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
 		elog(ERROR, "index \"%s\" already contains data",
 			 RelationGetRelationName(index));
 
diff --git a/src/backend/access/spgist/spginsert.c b/src/backend/access/spgist/spginsert.c
index dd90887..305f171 100644
--- a/src/backend/access/spgist/spginsert.c
+++ b/src/backend/access/spgist/spginsert.c
@@ -81,21 +81,32 @@ spgbuild(Relation heap, Relation index, IndexInfo *indexInfo)
 				rootbuffer,
 				nullbuffer;
 
-	if (RelationGetNumberOfBlocks(index) != 0)
-		elog(ERROR, "index \"%s\" already contains data",
-			 RelationGetRelationName(index));
-
-	/*
-	 * Initialize the meta page and root pages
-	 */
-	metabuffer = SpGistNewBuffer(index);
-	rootbuffer = SpGistNewBuffer(index);
-	nullbuffer = SpGistNewBuffer(index);
-
-	Assert(BufferGetBlockNumber(metabuffer) == SPGIST_METAPAGE_BLKNO);
-	Assert(BufferGetBlockNumber(rootbuffer) == SPGIST_ROOT_BLKNO);
-	Assert(BufferGetBlockNumber(nullbuffer) == SPGIST_NULL_BLKNO);
-
+	if (index->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
+	{
+		if (RelationGetNumberOfBlocks(index) != 0)
+			elog(ERROR, "index \"%s\" already contains data",
+				 RelationGetRelationName(index));
+
+		/*
+		 * Initialize the meta page and root pages
+		 */
+		metabuffer = SpGistNewBuffer(index);
+		rootbuffer = SpGistNewBuffer(index);
+		nullbuffer = SpGistNewBuffer(index);
+
+		Assert(BufferGetBlockNumber(metabuffer) == SPGIST_METAPAGE_BLKNO);
+		Assert(BufferGetBlockNumber(rootbuffer) == SPGIST_ROOT_BLKNO);
+		Assert(BufferGetBlockNumber(nullbuffer) == SPGIST_NULL_BLKNO);
+	}
+	else
+	{
+		metabuffer = ReadBuffer(index, SPGIST_METAPAGE_BLKNO);
+		rootbuffer = ReadBuffer(index, SPGIST_ROOT_BLKNO);
+		nullbuffer = ReadBuffer(index, SPGIST_NULL_BLKNO);
+		LockBuffer(metabuffer, BUFFER_LOCK_SHARE);
+		LockBuffer(rootbuffer, BUFFER_LOCK_SHARE);
+		LockBuffer(nullbuffer, BUFFER_LOCK_SHARE);
+	}
 	START_CRIT_SECTION();
 
 	SpGistInitMetapage(BufferGetPage(metabuffer));
diff --git a/src/backend/access/spgist/spgutils.c b/src/backend/access/spgist/spgutils.c
index e2d391e..42137de 100644
--- a/src/backend/access/spgist/spgutils.c
+++ b/src/backend/access/spgist/spgutils.c
@@ -21,6 +21,7 @@
 #include "access/spgist_private.h"
 #include "access/transam.h"
 #include "access/xact.h"
+#include "catalog/index.h"
 #include "catalog/pg_amop.h"
 #include "storage/bufmgr.h"
 #include "storage/indexfsm.h"
@@ -106,6 +107,7 @@ spgGetCache(Relation index)
 		spgConfigIn in;
 		FmgrInfo   *procinfo;
 		Buffer		metabuffer;
+		Page        metapage;
 		SpGistMetaPageData *metadata;
 
 		cache = MemoryContextAllocZero(index->rd_indexcxt,
@@ -155,12 +157,21 @@ spgGetCache(Relation index)
 		metabuffer = ReadBuffer(index, SPGIST_METAPAGE_BLKNO);
 		LockBuffer(metabuffer, BUFFER_LOCK_SHARE);
 
-		metadata = SpGistPageGetMeta(BufferGetPage(metabuffer));
+		metapage = BufferGetPage(metabuffer);
+		metadata = SpGistPageGetMeta(metapage);
 
 		if (metadata->magicNumber != SPGIST_MAGIC_NUMBER)
-			elog(ERROR, "index \"%s\" is not an SP-GiST index",
-				 RelationGetRelationName(index));
-
+		{
+			if (GlobalTempRelationPageIsNotInitialized(index, metapage))
+			{
+				Relation heap = RelationIdGetRelation(index->rd_index->indrelid);
+				spgbuild(heap, index, BuildIndexInfo(index));
+				RelationClose(heap);
+			}
+			else
+				elog(ERROR, "index \"%s\" is not an SP-GiST index",
+					 RelationGetRelationName(index));
+		}
 		cache->lastUsedPages = metadata->lastUsedPages;
 
 		UnlockReleaseBuffer(metabuffer);
diff --git a/src/backend/catalog/catalog.c b/src/backend/catalog/catalog.c
index 6b10469..88fca55 100644
--- a/src/backend/catalog/catalog.c
+++ b/src/backend/catalog/catalog.c
@@ -401,6 +401,9 @@ GetNewRelFileNode(Oid reltablespace, Relation pg_class, char relpersistence)
 		case RELPERSISTENCE_TEMP:
 			backend = BackendIdForTempRelations();
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index e995570..1522109 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3699,7 +3699,7 @@ reindex_relation(Oid relid, int flags, int options)
 		if (flags & REINDEX_REL_FORCE_INDEXES_UNLOGGED)
 			persistence = RELPERSISTENCE_UNLOGGED;
 		else if (flags & REINDEX_REL_FORCE_INDEXES_PERMANENT)
-			persistence = RELPERSISTENCE_PERMANENT;
+			persistence = rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ? RELPERSISTENCE_SESSION : RELPERSISTENCE_PERMANENT;
 		else
 			persistence = rel->rd_rel->relpersistence;
 
diff --git a/src/backend/catalog/storage.c b/src/backend/catalog/storage.c
index 056ea3d..317574a 100644
--- a/src/backend/catalog/storage.c
+++ b/src/backend/catalog/storage.c
@@ -92,6 +92,10 @@ RelationCreateStorage(RelFileNode rnode, char relpersistence)
 			backend = InvalidBackendId;
 			needs_wal = false;
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			needs_wal = false;
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
 			needs_wal = true;
diff --git a/src/backend/catalog/system_views.sql b/src/backend/catalog/system_views.sql
index f7800f0..23ab456 100644
--- a/src/backend/catalog/system_views.sql
+++ b/src/backend/catalog/system_views.sql
@@ -1332,7 +1332,15 @@ LANGUAGE INTERNAL
 STRICT STABLE PARALLEL SAFE
 AS 'jsonb_path_query_first_tz';
 
+
+--
+-- Statistic for global temporary tables
 --
+
+CREATE VIEW pg_gtt_statistic AS
+   SELECT s.* from pg_class c,pg_gtt_statistic_for_relation(c.oid) s where c.relpersistence='s';
+
+
 -- The default permissions for functions mean that anyone can execute them.
 -- A number of functions shouldn't be executable by just anyone, but rather
 -- than use explicit 'superuser()' checks in those functions, we use the GRANT
diff --git a/src/backend/commands/analyze.c b/src/backend/commands/analyze.c
index 71372ce..324a249 100644
--- a/src/backend/commands/analyze.c
+++ b/src/backend/commands/analyze.c
@@ -39,6 +39,7 @@
 #include "commands/vacuum.h"
 #include "executor/executor.h"
 #include "foreign/fdwapi.h"
+#include "funcapi.h"
 #include "miscadmin.h"
 #include "nodes/nodeFuncs.h"
 #include "parser/parse_oper.h"
@@ -102,7 +103,7 @@ static int	acquire_inherited_sample_rows(Relation onerel, int elevel,
 										  HeapTuple *rows, int targrows,
 										  double *totalrows, double *totaldeadrows);
 static void update_attstats(Oid relid, bool inh,
-							int natts, VacAttrStats **vacattrstats);
+							int natts, VacAttrStats **vacattrstats, bool is_global_temp);
 static Datum std_fetch_func(VacAttrStatsP stats, int rownum, bool *isNull);
 static Datum ind_fetch_func(VacAttrStatsP stats, int rownum, bool *isNull);
 
@@ -318,6 +319,7 @@ do_analyze_rel(Relation onerel, VacuumParams *params,
 	Oid			save_userid;
 	int			save_sec_context;
 	int			save_nestlevel;
+	bool        is_global_temp = onerel->rd_rel->relpersistence == RELPERSISTENCE_SESSION;
 
 	if (inh)
 		ereport(elevel,
@@ -575,14 +577,14 @@ do_analyze_rel(Relation onerel, VacuumParams *params,
 		 * pg_statistic for columns we didn't process, we leave them alone.)
 		 */
 		update_attstats(RelationGetRelid(onerel), inh,
-						attr_cnt, vacattrstats);
+						attr_cnt, vacattrstats, is_global_temp);
 
 		for (ind = 0; ind < nindexes; ind++)
 		{
 			AnlIndexData *thisdata = &indexdata[ind];
 
 			update_attstats(RelationGetRelid(Irel[ind]), false,
-							thisdata->attr_cnt, thisdata->vacattrstats);
+							thisdata->attr_cnt, thisdata->vacattrstats, is_global_temp);
 		}
 
 		/*
@@ -1425,7 +1427,7 @@ acquire_inherited_sample_rows(Relation onerel, int elevel,
  *		by taking a self-exclusive lock on the relation in analyze_rel().
  */
 static void
-update_attstats(Oid relid, bool inh, int natts, VacAttrStats **vacattrstats)
+update_attstats(Oid relid, bool inh, int natts, VacAttrStats **vacattrstats, bool is_global_temp)
 {
 	Relation	sd;
 	int			attno;
@@ -1527,30 +1529,42 @@ update_attstats(Oid relid, bool inh, int natts, VacAttrStats **vacattrstats)
 			}
 		}
 
-		/* Is there already a pg_statistic tuple for this attribute? */
-		oldtup = SearchSysCache3(STATRELATTINH,
-								 ObjectIdGetDatum(relid),
-								 Int16GetDatum(stats->attr->attnum),
-								 BoolGetDatum(inh));
-
-		if (HeapTupleIsValid(oldtup))
+		if (is_global_temp)
 		{
-			/* Yes, replace it */
-			stup = heap_modify_tuple(oldtup,
-									 RelationGetDescr(sd),
-									 values,
-									 nulls,
-									 replaces);
-			ReleaseSysCache(oldtup);
-			CatalogTupleUpdate(sd, &stup->t_self, stup);
+			stup = heap_form_tuple(RelationGetDescr(sd), values, nulls);
+			InsertSysCache(STATRELATTINH,
+						   ObjectIdGetDatum(relid),
+						   Int16GetDatum(stats->attr->attnum),
+						   BoolGetDatum(inh),
+						   0,
+						   stup);
 		}
 		else
 		{
-			/* No, insert new tuple */
-			stup = heap_form_tuple(RelationGetDescr(sd), values, nulls);
-			CatalogTupleInsert(sd, stup);
-		}
+			/* Is there already a pg_statistic tuple for this attribute? */
+			oldtup = SearchSysCache3(STATRELATTINH,
+									 ObjectIdGetDatum(relid),
+									 Int16GetDatum(stats->attr->attnum),
+									 BoolGetDatum(inh));
 
+			if (HeapTupleIsValid(oldtup))
+			{
+				/* Yes, replace it */
+				stup = heap_modify_tuple(oldtup,
+										 RelationGetDescr(sd),
+										 values,
+										 nulls,
+										 replaces);
+				ReleaseSysCache(oldtup);
+				CatalogTupleUpdate(sd, &stup->t_self, stup);
+			}
+			else
+			{
+				/* No, insert new tuple */
+				stup = heap_form_tuple(RelationGetDescr(sd), values, nulls);
+				CatalogTupleInsert(sd, stup);
+			}
+		}
 		heap_freetuple(stup);
 	}
 
@@ -2859,3 +2873,72 @@ analyze_mcv_list(int *mcv_counts,
 	}
 	return num_mcv;
 }
+
+PG_FUNCTION_INFO_V1(pg_gtt_statistic_for_relation);
+
+typedef struct
+{
+	int staattnum;
+	bool stainherit;
+} PgTempStatIteratorCtx;
+
+Datum
+pg_gtt_statistic_for_relation(PG_FUNCTION_ARGS)
+{
+	Oid starelid = PG_GETARG_OID(0);
+	ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
+	Tuplestorestate *tupstore;
+	MemoryContext per_query_ctx;
+	MemoryContext oldcontext;
+	TupleDesc	  tupdesc;
+	bool stainherit = false;
+
+	/* check to see if caller supports us returning a tuplestore */
+	if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
+		elog(ERROR, "return type must be a row type");
+
+	/* check to see if caller supports us returning a tuplestore */
+	if (rsinfo == NULL || !IsA(rsinfo, ReturnSetInfo))
+		ereport(ERROR,
+				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+				 errmsg("set-valued function called in context that cannot accept a set")));
+	if (!(rsinfo->allowedModes & SFRM_Materialize))
+		ereport(ERROR,
+				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+				 errmsg("materialize mode required, but it is not " \
+						"allowed in this context")));
+
+	/* Build tuplestore to hold the result rows */
+	per_query_ctx = rsinfo->econtext->ecxt_per_query_memory;
+	oldcontext = MemoryContextSwitchTo(per_query_ctx);
+
+	/* Build a tuple descriptor for our result type */
+
+	tupstore = tuplestore_begin_heap(true, false, work_mem);
+	rsinfo->returnMode = SFRM_Materialize;
+	rsinfo->setResult = tupstore;
+	rsinfo->setDesc = tupdesc;
+
+	do
+	{
+		int staattnum = 0;
+		while (true)
+		{
+			HeapTuple statup = SearchSysCacheCopy3(STATRELATTINH,
+												   ObjectIdGetDatum(starelid),
+												   Int16GetDatum(++staattnum),
+												   BoolGetDatum(stainherit));
+			if (statup != NULL)
+				tuplestore_puttuple(tupstore, statup);
+			else
+				break;
+		}
+		stainherit = !stainherit;
+	} while (stainherit);
+
+	MemoryContextSwitchTo(oldcontext);
+ 
+	tuplestore_donestoring(tupstore);
+
+	return (Datum) 0;
+}
diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index b8c349f..80b7fb4 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -391,6 +391,13 @@ cluster_rel(Oid tableOid, Oid indexOid, int options)
 					 errmsg("cannot vacuum temporary tables of other sessions")));
 	}
 
+	/* not support cluster global temp table yet */
+	if (OldHeap->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
+		ereport(ERROR,
+				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+				errmsg("not support cluster global temporary tables yet")));
+
+
 	/*
 	 * Also check for active uses of the relation in the current transaction,
 	 * including open scans and pending AFTER trigger events.
@@ -1399,7 +1406,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap,
 	 */
 	if (newrelpersistence == RELPERSISTENCE_UNLOGGED)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_UNLOGGED;
-	else if (newrelpersistence == RELPERSISTENCE_PERMANENT)
+	else if (newrelpersistence != RELPERSISTENCE_TEMP)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_PERMANENT;
 
 	/* Report that we are now reindexing relations */
diff --git a/src/backend/commands/sequence.c b/src/backend/commands/sequence.c
index a13322b..be661a4 100644
--- a/src/backend/commands/sequence.c
+++ b/src/backend/commands/sequence.c
@@ -94,7 +94,7 @@ static HTAB *seqhashtab = NULL; /* hash table for SeqTable items */
  */
 static SeqTableData *last_used_seq = NULL;
 
-static void fill_seq_with_data(Relation rel, HeapTuple tuple);
+static void fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf);
 static Relation lock_and_open_sequence(SeqTable seq);
 static void create_seq_hashtable(void);
 static void init_sequence(Oid relid, SeqTable *p_elm, Relation *p_rel);
@@ -222,7 +222,7 @@ DefineSequence(ParseState *pstate, CreateSeqStmt *seq)
 
 	/* now initialize the sequence's data */
 	tuple = heap_form_tuple(tupDesc, value, null);
-	fill_seq_with_data(rel, tuple);
+	fill_seq_with_data(rel, tuple, InvalidBuffer);
 
 	/* process OWNED BY if given */
 	if (owned_by)
@@ -327,7 +327,7 @@ ResetSequence(Oid seq_relid)
 	/*
 	 * Insert the modified tuple into the new storage file.
 	 */
-	fill_seq_with_data(seq_rel, tuple);
+	fill_seq_with_data(seq_rel, tuple, InvalidBuffer);
 
 	/* Clear local cache so that we don't think we have cached numbers */
 	/* Note that we do not change the currval() state */
@@ -340,18 +340,21 @@ ResetSequence(Oid seq_relid)
  * Initialize a sequence's relation with the specified tuple as content
  */
 static void
-fill_seq_with_data(Relation rel, HeapTuple tuple)
+fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf)
 {
-	Buffer		buf;
 	Page		page;
 	sequence_magic *sm;
 	OffsetNumber offnum;
+	bool lockBuffer = false;
 
 	/* Initialize first page of relation with special magic number */
 
-	buf = ReadBuffer(rel, P_NEW);
-	Assert(BufferGetBlockNumber(buf) == 0);
-
+	if (buf == InvalidBuffer)
+	{
+		buf = ReadBuffer(rel, P_NEW);
+		Assert(BufferGetBlockNumber(buf) == 0);
+		lockBuffer = true;
+	}
 	page = BufferGetPage(buf);
 
 	PageInit(page, BufferGetPageSize(buf), sizeof(sequence_magic));
@@ -360,7 +363,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	/* Now insert sequence tuple */
 
-	LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
+	if (lockBuffer)
+		LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
 
 	/*
 	 * Since VACUUM does not process sequences, we have to force the tuple to
@@ -410,7 +414,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	END_CRIT_SECTION();
 
-	UnlockReleaseBuffer(buf);
+	if (lockBuffer)
+		UnlockReleaseBuffer(buf);
 }
 
 /*
@@ -502,7 +507,7 @@ AlterSequence(ParseState *pstate, AlterSeqStmt *stmt)
 		/*
 		 * Insert the modified tuple into the new storage file.
 		 */
-		fill_seq_with_data(seqrel, newdatatuple);
+		fill_seq_with_data(seqrel, newdatatuple, InvalidBuffer);
 	}
 
 	/* process OWNED BY if given */
@@ -1178,6 +1183,17 @@ read_seq_tuple(Relation rel, Buffer *buf, HeapTuple seqdatatuple)
 	LockBuffer(*buf, BUFFER_LOCK_EXCLUSIVE);
 
 	page = BufferGetPage(*buf);
+	if (GlobalTempRelationPageIsNotInitialized(rel, page))
+	{
+		/* Initialize sequence for global temporary tables */
+		Datum		value[SEQ_COL_LASTCOL] = {0};
+		bool		null[SEQ_COL_LASTCOL] = {false};
+		HeapTuple tuple;
+		value[SEQ_COL_LASTVAL-1] = Int64GetDatumFast(1); /* start sequence with 1 */
+		tuple = heap_form_tuple(RelationGetDescr(rel), value, null);
+		fill_seq_with_data(rel, tuple, *buf);
+	}
+
 	sm = (sequence_magic *) PageGetSpecialPointer(page);
 
 	if (sm->magic != SEQ_MAGIC)
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 5440eb9..6aec01d 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -12,6 +12,9 @@
  *
  *-------------------------------------------------------------------------
  */
+#include <sys/stat.h>
+#include <unistd.h>
+
 #include "postgres.h"
 
 #include "access/genam.h"
@@ -531,6 +534,23 @@ static List *GetParentedForeignKeyRefs(Relation partition);
 static void ATDetachCheckNoForeignKeyRefs(Relation partition);
 
 
+static bool
+has_oncommit_option(List *options)
+{
+	ListCell   *listptr;
+
+	foreach(listptr, options)
+	{
+		DefElem    *def = (DefElem *) lfirst(listptr);
+
+		if (pg_strcasecmp(def->defname, "on_commit_delete_rows") == 0)
+			return true;
+	}
+
+	return false;
+}
+
+
 /* ----------------------------------------------------------------
  *		DefineRelation
  *				Creates a new relation.
@@ -574,6 +594,7 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 	LOCKMODE	parentLockmode;
 	const char *accessMethod = NULL;
 	Oid			accessMethodId = InvalidOid;
+	bool		has_oncommit_clause = false;
 
 	/*
 	 * Truncate relname to appropriate length (probably a waste of time, as
@@ -585,7 +606,7 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 	 * Check consistency of arguments
 	 */
 	if (stmt->oncommit != ONCOMMIT_NOOP
-		&& stmt->relation->relpersistence != RELPERSISTENCE_TEMP)
+		&& !IsLocalRelpersistence(stmt->relation->relpersistence))
 		ereport(ERROR,
 				(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 				 errmsg("ON COMMIT can only be used on temporary tables")));
@@ -611,17 +632,6 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 		RangeVarGetAndCheckCreationNamespace(stmt->relation, NoLock, NULL);
 
 	/*
-	 * Security check: disallow creating temp tables from security-restricted
-	 * code.  This is needed because calling code might not expect untrusted
-	 * tables to appear in pg_temp at the front of its search path.
-	 */
-	if (stmt->relation->relpersistence == RELPERSISTENCE_TEMP
-		&& InSecurityRestrictedOperation())
-		ereport(ERROR,
-				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
-				 errmsg("cannot create temporary table within security-restricted operation")));
-
-	/*
 	 * Determine the lockmode to use when scanning parents.  A self-exclusive
 	 * lock is needed here.
 	 *
@@ -716,6 +726,38 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 	/*
 	 * Parse and validate reloptions, if any.
 	 */
+	/* global temp table */
+	has_oncommit_clause = has_oncommit_option(stmt->options);
+	if (stmt->relation->relpersistence == RELPERSISTENCE_SESSION)
+	{
+		if (has_oncommit_clause)
+		{
+			if (stmt->oncommit != ONCOMMIT_NOOP)
+				elog(ERROR, "can not defeine global temp table with on commit and with clause at same time");
+		}
+		else if (stmt->oncommit != ONCOMMIT_NOOP)
+		{
+			DefElem *opt = makeNode(DefElem);
+
+			opt->type = T_DefElem;
+			opt->defnamespace = NULL;
+			opt->defname = "on_commit_delete_rows";
+			opt->defaction = DEFELEM_UNSPEC;
+
+			/* use reloptions to remember on commit clause */
+			if (stmt->oncommit == ONCOMMIT_DELETE_ROWS)
+				opt->arg  = (Node *)makeString("true");
+			else if (stmt->oncommit == ONCOMMIT_PRESERVE_ROWS)
+				opt->arg  = (Node *)makeString("false");
+			else
+				elog(ERROR, "global temp table not support on commit drop clause");
+
+			stmt->options = lappend(stmt->options, opt);
+		}
+	}
+	else if (has_oncommit_clause)
+		elog(ERROR, "regular table cannot specifie on_commit_delete_rows");
+
 	reloptions = transformRelOptions((Datum) 0, stmt->options, NULL, validnsps,
 									 true, false);
 
@@ -1777,7 +1819,8 @@ ExecuteTruncateGuts(List *explicit_rels, List *relids, List *relids_logged,
 		 * table or the current physical file to be thrown away anyway.
 		 */
 		if (rel->rd_createSubid == mySubid ||
-			rel->rd_newRelfilenodeSubid == mySubid)
+			rel->rd_newRelfilenodeSubid == mySubid ||
+			rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
 		{
 			/* Immediate, non-rollbackable truncation is OK */
 			heap_truncate_one_rel(rel);
@@ -3456,6 +3499,26 @@ AlterTableLookupRelation(AlterTableStmt *stmt, LOCKMODE lockmode)
 									(void *) stmt);
 }
 
+
+static bool
+CheckGlobalTempTableNotInUse(Relation rel)
+{
+	int id;
+	for (id = 1; id <= MaxBackends; id++)
+	{
+		if (id != MyBackendId)
+		{
+			struct stat fst;
+			char* path = relpathbackend(rel->rd_node, id, MAIN_FORKNUM);
+			int rc = stat(path, &fst);
+			pfree(path);
+			if (rc == 0 && fst.st_size != 0)
+				return false;
+		}
+	}
+	return true;
+}
+
 /*
  * AlterTable
  *		Execute ALTER TABLE, which can be a list of subcommands
@@ -3507,6 +3570,9 @@ AlterTable(Oid relid, LOCKMODE lockmode, AlterTableStmt *stmt)
 	rel = relation_open(relid, NoLock);
 
 	CheckTableNotInUse(rel, "ALTER TABLE");
+	if (rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION
+		&& !CheckGlobalTempTableNotInUse(rel))
+		elog(ERROR, "Global temp table used by active backends can not be altered");
 
 	ATController(stmt, rel, stmt->cmds, stmt->relation->inh, lockmode);
 }
@@ -7715,6 +7781,12 @@ ATAddForeignKeyConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
 						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 						 errmsg("constraints on unlogged tables may reference only permanent or unlogged tables")));
 			break;
+		case RELPERSISTENCE_SESSION:
+			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
+				ereport(ERROR,
+						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+						 errmsg("constraints on session tables may reference only session tables")));
+			break;
 		case RELPERSISTENCE_TEMP:
 			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_TEMP)
 				ereport(ERROR,
@@ -14149,6 +14221,13 @@ ATPrepChangePersistence(Relation rel, bool toLogged)
 							RelationGetRelationName(rel)),
 					 errtable(rel)));
 			break;
+		case RELPERSISTENCE_SESSION:
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+					 errmsg("cannot change logged status of session table \"%s\"",
+							RelationGetRelationName(rel)),
+					 errtable(rel)));
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			if (toLogged)
 				/* nothing to do */
@@ -14636,14 +14715,7 @@ PreCommit_on_commit_actions(void)
 				/* Do nothing (there shouldn't be such entries, actually) */
 				break;
 			case ONCOMMIT_DELETE_ROWS:
-
-				/*
-				 * If this transaction hasn't accessed any temporary
-				 * relations, we can skip truncating ON COMMIT DELETE ROWS
-				 * tables, as they must still be empty.
-				 */
-				if ((MyXactFlags & XACT_FLAGS_ACCESSEDTEMPNAMESPACE))
-					oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
+				oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
 				break;
 			case ONCOMMIT_DROP:
 				oids_to_drop = lappend_oid(oids_to_drop, oc->relid);
diff --git a/src/backend/optimizer/path/allpaths.c b/src/backend/optimizer/path/allpaths.c
index db3a68a..60212b0 100644
--- a/src/backend/optimizer/path/allpaths.c
+++ b/src/backend/optimizer/path/allpaths.c
@@ -48,6 +48,7 @@
 #include "partitioning/partprune.h"
 #include "rewrite/rewriteManip.h"
 #include "utils/lsyscache.h"
+#include "utils/rel.h"
 
 
 /* results of subquery_is_pushdown_safe */
@@ -618,7 +619,7 @@ set_rel_consider_parallel(PlannerInfo *root, RelOptInfo *rel,
 			 * the rest of the necessary infrastructure right now anyway.  So
 			 * for now, bail out if we see a temporary table.
 			 */
-			if (get_rel_persistence(rte->relid) == RELPERSISTENCE_TEMP)
+			if (IsLocalRelpersistence(get_rel_persistence(rte->relid)))
 				return;
 
 			/*
diff --git a/src/backend/optimizer/plan/planner.c b/src/backend/optimizer/plan/planner.c
index 7fe11b5..4f99402 100644
--- a/src/backend/optimizer/plan/planner.c
+++ b/src/backend/optimizer/plan/planner.c
@@ -6306,7 +6306,7 @@ plan_create_index_workers(Oid tableOid, Oid indexOid)
 	 * Furthermore, any index predicate or index expressions must be parallel
 	 * safe.
 	 */
-	if (heap->rd_rel->relpersistence == RELPERSISTENCE_TEMP ||
+	if (RelationHasSessionScope(heap) ||
 		!is_parallel_safe(root, (Node *) RelationGetIndexExpressions(index)) ||
 		!is_parallel_safe(root, (Node *) RelationGetIndexPredicate(index)))
 	{
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index c508684..c9e228b 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -3268,20 +3268,11 @@ OptTemp:	TEMPORARY					{ $$ = RELPERSISTENCE_TEMP; }
 			| TEMP						{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMPORARY			{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMP				{ $$ = RELPERSISTENCE_TEMP; }
-			| GLOBAL TEMPORARY
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
-			| GLOBAL TEMP
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
+			| GLOBAL TEMPORARY          { $$ = RELPERSISTENCE_SESSION; }
+			| GLOBAL TEMP               { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION                   { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMPORARY         { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMP              { $$ = RELPERSISTENCE_SESSION; }
 			| UNLOGGED					{ $$ = RELPERSISTENCE_UNLOGGED; }
 			| /*EMPTY*/					{ $$ = RELPERSISTENCE_PERMANENT; }
 		;
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index ee47547..ea7fe4c 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -437,6 +437,14 @@ generateSerialExtraStmts(CreateStmtContext *cxt, ColumnDef *column,
 	seqstmt->options = seqoptions;
 
 	/*
+	 * Why we should not always use persistence of parent table?
+	 * Although it is prohibited to have unlogged sequences,
+	 * unlogged tables with SERIAL fields are accepted!
+	 */
+	if (cxt->relation->relpersistence != RELPERSISTENCE_UNLOGGED)
+		seqstmt->sequence->relpersistence = cxt->relation->relpersistence;
+
+	/*
 	 * If a sequence data type was specified, add it to the options.  Prepend
 	 * to the list rather than append; in case a user supplied their own AS
 	 * clause, the "redundant options" error will point to their occurrence,
diff --git a/src/backend/postmaster/autovacuum.c b/src/backend/postmaster/autovacuum.c
index c1dd816..dcfc134 100644
--- a/src/backend/postmaster/autovacuum.c
+++ b/src/backend/postmaster/autovacuum.c
@@ -2157,7 +2157,7 @@ do_autovacuum(void)
 		/*
 		 * We cannot safely process other backends' temp tables, so skip 'em.
 		 */
-		if (classForm->relpersistence == RELPERSISTENCE_TEMP)
+		if (IsLocalRelpersistence(classForm->relpersistence))
 			continue;
 
 		relid = classForm->oid;
diff --git a/src/backend/storage/buffer/bufmgr.c b/src/backend/storage/buffer/bufmgr.c
index 7ad1073..a085893 100644
--- a/src/backend/storage/buffer/bufmgr.c
+++ b/src/backend/storage/buffer/bufmgr.c
@@ -2933,7 +2933,7 @@ DropRelFileNodeBuffers(RelFileNodeBackend rnode, ForkNumber *forkNum,
 	/* If it's a local relation, it's localbuf.c's problem. */
 	if (RelFileNodeBackendIsTemp(rnode))
 	{
-		if (rnode.backend == MyBackendId)
+		if (GetRelationBackendId(rnode.backend) == MyBackendId)
 		{
 			for (j = 0; j < nforks; j++)
 				DropRelFileNodeLocalBuffers(rnode.node, forkNum[j],
diff --git a/src/backend/storage/smgr/md.c b/src/backend/storage/smgr/md.c
index 8a9eaf6..997d331 100644
--- a/src/backend/storage/smgr/md.c
+++ b/src/backend/storage/smgr/md.c
@@ -27,12 +27,14 @@
 
 #include "access/xlog.h"
 #include "access/xlogutils.h"
+#include "commands/tablecmds.h"
 #include "commands/tablespace.h"
 #include "miscadmin.h"
 #include "pg_trace.h"
 #include "pgstat.h"
 #include "postmaster/bgwriter.h"
 #include "storage/bufmgr.h"
+#include "storage/ipc.h"
 #include "storage/fd.h"
 #include "storage/md.h"
 #include "storage/relfilenode.h"
@@ -40,6 +42,7 @@
 #include "storage/sync.h"
 #include "utils/hsearch.h"
 #include "utils/memutils.h"
+#include "utils/rel.h"
 
 /*
  *	The magnetic disk storage manager keeps track of open file
@@ -87,6 +90,19 @@ typedef struct _MdfdVec
 
 static MemoryContext MdCxt;		/* context for all MdfdVec objects */
 
+/*
+ * Structure used to collect information created by this backend.
+ * Data of this related should be deleted on backend exit.
+ */
+typedef struct SessionRelation
+{
+	RelFileNodeBackend rnode;
+	ForkNumber forknum;
+	struct SessionRelation* next;
+} SessionRelation;
+
+
+static SessionRelation* SessionRelations;
 
 /* Populate a file tag describing an md.c segment file. */
 #define INIT_MD_FILETAG(a,xx_rnode,xx_forknum,xx_segno) \
@@ -152,6 +168,60 @@ mdinit(void)
 								  ALLOCSET_DEFAULT_SIZES);
 }
 
+
+/*
+ * Delete all data of session relations and remove their pages from shared buffers.
+ * This function is called on backend exit.
+ */
+static void
+TruncateSessionRelations(int code, Datum arg)
+{
+	SessionRelation* rel;
+	for (rel = SessionRelations; rel != NULL; rel = rel->next)
+	{
+		/* Delete relation files */
+		mdunlink(rel->rnode, rel->forknum, false);
+	}
+}
+
+/*
+ * Maintain information about session relations accessed by this backend.
+ * This list is needed to perform cleanup on backend exit.
+ * Session relation is linked in this list when this relation is created or opened and file doesn't exist.
+ * Such procedure guarantee that each relation is linked into list only once.
+ */
+static void
+RegisterSessionRelation(SMgrRelation reln, ForkNumber forknum)
+{
+	SessionRelation* rel = (SessionRelation*)MemoryContextAlloc(TopMemoryContext, sizeof(SessionRelation));
+
+	/*
+	 * Perform session relation cleanup on backend exit. We are using shared memory hook, because
+	 * cleanup should be performed before backend is disconnected from shared memory.
+	 */
+	if (SessionRelations == NULL)
+		on_shmem_exit(TruncateSessionRelations, 0);
+
+	rel->rnode = reln->smgr_rnode;
+	rel->forknum = forknum;
+	rel->next = SessionRelations;
+	SessionRelations = rel;
+}
+
+static void
+RegisterOnCommitAction(SMgrRelation reln, ForkNumber forknum)
+{
+	if (reln->smgr_owner && forknum == MAIN_FORKNUM)
+	{
+		Relation rel = (Relation)((char*)reln->smgr_owner - offsetof(RelationData, rd_smgr));
+		if (rel->rd_options
+			&& ((StdRdOptions *)rel->rd_options)->on_commit_delete_rows)
+		{
+			register_on_commit_action(rel->rd_id, ONCOMMIT_DELETE_ROWS);
+		}
+	}
+}
+
 /*
  *	mdexists() -- Does the physical file exist?
  *
@@ -218,6 +288,8 @@ mdcreate(SMgrRelation reln, ForkNumber forkNum, bool isRedo)
 					 errmsg("could not create file \"%s\": %m", path)));
 		}
 	}
+	if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		RegisterSessionRelation(reln, forkNum);
 
 	pfree(path);
 
@@ -465,6 +537,21 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 
 	if (fd < 0)
 	{
+		/*
+		 * In case of session relation access, there may be no yet files of this relation for this backend.
+		 * If so, then create file and register session relation for truncation on backend exit.
+		 */
+		if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
+			fd = PathNameOpenFile(path, O_RDWR | PG_BINARY | O_CREAT);
+			if (fd >= 0)
+			{
+				RegisterSessionRelation(reln, forknum);
+				if (!(behavior & EXTENSION_RETURN_NULL))
+					RegisterOnCommitAction(reln, forknum);
+				goto NewSegment;
+			}
+		}
 		if ((behavior & EXTENSION_RETURN_NULL) &&
 			FILE_POSSIBLY_DELETED(errno))
 		{
@@ -476,6 +563,7 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 				 errmsg("could not open file \"%s\": %m", path)));
 	}
 
+  NewSegment:
 	pfree(path);
 
 	_fdvec_resize(reln, forknum, 1);
@@ -652,8 +740,13 @@ mdread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
 		 * complaining.  This allows, for example, the case of trying to
 		 * update a block that was later truncated away.
 		 */
-		if (zero_damaged_pages || InRecovery)
+		if (zero_damaged_pages || InRecovery || RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
 			MemSet(buffer, 0, BLCKSZ);
+			/* In case of session relation we need to write zero page to provide correct result of subsequent mdnblocks */
+			if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+				mdwrite(reln, forknum, blocknum, buffer, true);
+		}
 		else
 			ereport(ERROR,
 					(errcode(ERRCODE_DATA_CORRUPTED),
@@ -743,7 +836,8 @@ mdnblocks(SMgrRelation reln, ForkNumber forknum)
 	BlockNumber segno = 0;
 
 	/* mdopen has opened the first segment */
-	Assert(reln->md_num_open_segs[forknum] > 0);
+	if (reln->md_num_open_segs[forknum] == 0)
+		return 0;
 
 	/*
 	 * Start from the last open segments, to avoid redundant seeks.  We have
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index a87e721..2401361 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -994,6 +994,9 @@ pg_relation_filepath(PG_FUNCTION_ARGS)
 	/* Determine owning backend. */
 	switch (relform->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/utils/cache/catcache.c b/src/backend/utils/cache/catcache.c
index c3e7d94..720dd52 100644
--- a/src/backend/utils/cache/catcache.c
+++ b/src/backend/utils/cache/catcache.c
@@ -1191,6 +1191,110 @@ SearchCatCache4(CatCache *cache,
 	return SearchCatCacheInternal(cache, 4, v1, v2, v3, v4);
 }
 
+
+void InsertCatCache(CatCache *cache,
+					Datum v1, Datum v2, Datum v3, Datum v4,
+					HeapTuple tuple)
+{
+	Datum		arguments[CATCACHE_MAXKEYS];
+	uint32		hashValue;
+	Index		hashIndex;
+	CatCTup    *ct;
+	dlist_iter	iter;
+	dlist_head *bucket;
+	int         nkeys = cache->cc_nkeys;
+	MemoryContext oldcxt;
+
+	/*
+	 * one-time startup overhead for each cache
+	 */
+	if (unlikely(cache->cc_tupdesc == NULL))
+		CatalogCacheInitializeCache(cache);
+
+	/* Initialize local parameter array */
+	arguments[0] = v1;
+	arguments[1] = v2;
+	arguments[2] = v3;
+	arguments[3] = v4;
+	/*
+	 * find the hash bucket in which to look for the tuple
+	 */
+	hashValue = CatalogCacheComputeHashValue(cache, nkeys, v1, v2, v3, v4);
+	hashIndex = HASH_INDEX(hashValue, cache->cc_nbuckets);
+
+	/*
+	 * scan the hash bucket until we find a match or exhaust our tuples
+	 *
+	 * Note: it's okay to use dlist_foreach here, even though we modify the
+	 * dlist within the loop, because we don't continue the loop afterwards.
+	 */
+	bucket = &cache->cc_bucket[hashIndex];
+	dlist_foreach(iter, bucket)
+	{
+		ct = dlist_container(CatCTup, cache_elem, iter.cur);
+
+		if (ct->dead)
+			continue;			/* ignore dead entries */
+
+		if (ct->hash_value != hashValue)
+			continue;			/* quickly skip entry if wrong hash val */
+
+		if (!CatalogCacheCompareTuple(cache, nkeys, ct->keys, arguments))
+			continue;
+
+		/*
+		 * If it's a positive entry, bump its refcount and return it. If it's
+		 * negative, we can report failure to the caller.
+		 */
+		if (ct->tuple.t_len == tuple->t_len)
+		{
+			memcpy((char *) ct->tuple.t_data,
+				   (const char *) tuple->t_data,
+				   tuple->t_len);
+			return;
+		}
+		dlist_delete(&ct->cache_elem);
+		pfree(ct);
+		cache->cc_ntup -= 1;
+		CacheHdr->ch_ntup -= 1;
+		break;
+	}
+	/* Allocate memory for CatCTup and the cached tuple in one go */
+	oldcxt = MemoryContextSwitchTo(CacheMemoryContext);
+
+	ct = (CatCTup *) palloc(sizeof(CatCTup) +
+							MAXIMUM_ALIGNOF + tuple->t_len);
+	ct->tuple.t_len = tuple->t_len;
+	ct->tuple.t_self = tuple->t_self;
+	ct->tuple.t_tableOid = tuple->t_tableOid;
+	ct->tuple.t_data = (HeapTupleHeader)
+		MAXALIGN(((char *) ct) + sizeof(CatCTup));
+	/* copy tuple contents */
+	memcpy((char *) ct->tuple.t_data,
+		   (const char *) tuple->t_data,
+		   tuple->t_len);
+	ct->ct_magic = CT_MAGIC;
+	ct->my_cache = cache;
+	ct->c_list = NULL;
+	ct->refcount = 1;			/* pinned*/
+	ct->dead = false;
+	ct->negative = false;
+	ct->hash_value = hashValue;
+	dlist_push_head(&cache->cc_bucket[hashIndex], &ct->cache_elem);
+	memcpy(ct->keys, arguments, nkeys*sizeof(Datum));
+
+	cache->cc_ntup++;
+	CacheHdr->ch_ntup++;
+	MemoryContextSwitchTo(oldcxt);
+
+	/*
+	 * If the hash table has become too full, enlarge the buckets array. Quite
+	 * arbitrarily, we enlarge when fill factor > 2.
+	 */
+	if (cache->cc_ntup > cache->cc_nbuckets * 2)
+		RehashCatCache(cache);
+}
+
 /*
  * Work-horse for SearchCatCache/SearchCatCacheN.
  */
diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c
index 50f8912..d9e0230 100644
--- a/src/backend/utils/cache/relcache.c
+++ b/src/backend/utils/cache/relcache.c
@@ -1097,6 +1097,10 @@ RelationBuildDesc(Oid targetRelId, bool insertIt)
 	relation->rd_newRelfilenodeSubid = InvalidSubTransactionId;
 	switch (relation->rd_rel->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			relation->rd_backend = BackendIdForSessionRelations();
+			relation->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			relation->rd_backend = InvalidBackendId;
@@ -3300,6 +3304,10 @@ RelationBuildLocalRelation(const char *relname,
 	rel->rd_rel->relpersistence = relpersistence;
 	switch (relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			rel->rd_backend = BackendIdForSessionRelations();
+			rel->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			rel->rd_backend = InvalidBackendId;
diff --git a/src/backend/utils/cache/syscache.c b/src/backend/utils/cache/syscache.c
index d69c0ff..87d273e 100644
--- a/src/backend/utils/cache/syscache.c
+++ b/src/backend/utils/cache/syscache.c
@@ -1156,6 +1156,16 @@ SearchSysCache4(int cacheId,
 	return SearchCatCache4(SysCache[cacheId], key1, key2, key3, key4);
 }
 
+void
+InsertSysCache(int cacheId,
+			   Datum key1, Datum key2, Datum key3, Datum key4,
+			   HeapTuple value)
+{
+	Assert(cacheId >= 0 && cacheId < SysCacheSize &&
+		   PointerIsValid(SysCache[cacheId]));
+	InsertCatCache(SysCache[cacheId], key1, key2, key3, key4, value);
+}
+
 /*
  * ReleaseSysCache
  *		Release previously grabbed reference count on a tuple
diff --git a/src/backend/utils/fmgr/funcapi.c b/src/backend/utils/fmgr/funcapi.c
index 4688fbc..e191511 100644
--- a/src/backend/utils/fmgr/funcapi.c
+++ b/src/backend/utils/fmgr/funcapi.c
@@ -18,6 +18,7 @@
 #include "catalog/namespace.h"
 #include "catalog/pg_proc.h"
 #include "catalog/pg_type.h"
+#include "catalog/pg_statistic_d.h"
 #include "funcapi.h"
 #include "nodes/nodeFuncs.h"
 #include "parser/parse_coerce.h"
@@ -30,6 +31,13 @@
 #include "utils/syscache.h"
 #include "utils/typcache.h"
 
+/*
+ * TODO: find less ugly way to declare core function returning pg_statistics.
+ * OID of pg_gtt_statistic_for_relation. This function should be handled in special way because it returns set of pg_statistics
+ * which contains attributes of anyarray type. Type of attributes can not be deduced from input parameters and
+ * it prevents using tuple descriptor in this case.
+ */
+#define GttStatisticFunctionId 3434
 
 static void shutdown_MultiFuncCall(Datum arg);
 static TypeFuncClass internal_get_result_type(Oid funcid,
@@ -341,7 +349,8 @@ internal_get_result_type(Oid funcid,
 
 		if (resolve_polymorphic_tupdesc(tupdesc,
 										&procform->proargtypes,
-										call_expr))
+										call_expr) ||
+			funcid == GttStatisticFunctionId)
 		{
 			if (tupdesc->tdtypeid == RECORDOID &&
 				tupdesc->tdtypmod < 0)
diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
index 08658c8..f2adc5a 100644
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -15635,8 +15635,8 @@ dumpTableSchema(Archive *fout, TableInfo *tbinfo)
 											 tbinfo->dobj.catId.oid, false);
 
 		appendPQExpBuffer(q, "CREATE %s%s %s",
-						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ?
-						  "UNLOGGED " : "",
+						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ? "UNLOGGED "
+						  : tbinfo->relpersistence == RELPERSISTENCE_SESSION ? "SESSION " : "",
 						  reltypename,
 						  qualrelname);
 
diff --git a/src/common/relpath.c b/src/common/relpath.c
index 62b9553..cef99d2 100644
--- a/src/common/relpath.c
+++ b/src/common/relpath.c
@@ -166,7 +166,18 @@ GetRelationPath(Oid dbNode, Oid spcNode, Oid relNode,
 		}
 		else
 		{
-			if (forkNumber != MAIN_FORKNUM)
+			/*
+			 * Session relations are distinguished from local temp relations by adding
+			 * SessionRelFirstBackendId offset to backendId.
+			 * These is no need to separate them at file system level, so just subtract SessionRelFirstBackendId
+			 * to avoid too long file names.
+			 * Segments of session relations have the same prefix (t%d_) as local temporary relations
+			 * to make it possible to cleanup them in the same way as local temporary relation files.
+			 */
+			 if (backendId >= SessionRelFirstBackendId)
+				 backendId -= SessionRelFirstBackendId;
+
+			 if (forkNumber != MAIN_FORKNUM)
 				path = psprintf("base/%u/t%d_%u_%s",
 								dbNode, backendId, relNode,
 								forkNames[forkNumber]);
diff --git a/src/include/catalog/pg_class.h b/src/include/catalog/pg_class.h
index 090b6ba..6a39663 100644
--- a/src/include/catalog/pg_class.h
+++ b/src/include/catalog/pg_class.h
@@ -165,6 +165,7 @@ typedef FormData_pg_class *Form_pg_class;
 #define		  RELPERSISTENCE_PERMANENT	'p' /* regular table */
 #define		  RELPERSISTENCE_UNLOGGED	'u' /* unlogged permanent table */
 #define		  RELPERSISTENCE_TEMP		't' /* temporary table */
+#define		  RELPERSISTENCE_SESSION	's' /* session table */
 
 /* default selection for replica identity (primary key or nothing) */
 #define		  REPLICA_IDENTITY_DEFAULT	'd'
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index ac8f64b..a683ef0 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -5476,7 +5476,14 @@
   proname => 'pg_stat_get_xact_function_self_time', provolatile => 'v',
   proparallel => 'r', prorettype => 'float8', proargtypes => 'oid',
   prosrc => 'pg_stat_get_xact_function_self_time' },
-
+{ oid => '3434',
+  descr => 'show local statistics for global temp table',
+  proname => 'pg_gtt_statistic_for_relation', provolatile => 'v', proparallel => 'u',
+  prorettype => 'record', proretset => 't', prorows => '100', proargtypes => 'oid',
+  proallargtypes => '{oid,oid,int2,bool,float4,int4,float4,int2,int2,int2,int2,int2,oid,oid,oid,oid,oid,oid,oid,oid,oid,oid,_float4,_float4,_float4,_float4,_float4,anyarray,anyarray,anyarray,anyarray,anyarray}',
+  proargmodes => '{i,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o}',
+  proargnames => '{relid,starelid,staattnum,stainherit,stanullfrac,stawidth,stadistinct,stakind1,stakind2,stakind3,stakind4,stakind5,staop1,staop2,staop3,staop4,staop5,stacoll1,stacoll2,stacoll3,stacoll4,stacoll5,stanumbers1,stanumbers2,stanumbers3,stanumbers4,stanumbers5,stavalues1,stavalues2,stavalues3,stavalues4,stavalues5}',
+  prosrc => 'pg_gtt_statistic_for_relation' },
 { oid => '3788',
   descr => 'statistics: timestamp of the current statistics snapshot',
   proname => 'pg_stat_get_snapshot_timestamp', provolatile => 's',
diff --git a/src/include/storage/backendid.h b/src/include/storage/backendid.h
index 70ef8eb..11b4b89 100644
--- a/src/include/storage/backendid.h
+++ b/src/include/storage/backendid.h
@@ -22,6 +22,13 @@ typedef int BackendId;			/* unique currently active backend identifier */
 
 #define InvalidBackendId		(-1)
 
+/*
+ * We need to distinguish local and global temporary relations by RelFileNodeBackend.
+ * The least invasive change is to add some special bias value to backend id (since 
+ * maximal number of backed is limited by MaxBackends).
+ */
+#define SessionRelFirstBackendId (0x40000000)
+
 extern PGDLLIMPORT BackendId MyBackendId;	/* backend id of this backend */
 
 /* backend id of our parallel session leader, or InvalidBackendId if none */
@@ -34,4 +41,12 @@ extern PGDLLIMPORT BackendId ParallelMasterBackendId;
 #define BackendIdForTempRelations() \
 	(ParallelMasterBackendId == InvalidBackendId ? MyBackendId : ParallelMasterBackendId)
 
+
+#define BackendIdForSessionRelations() \
+	(BackendIdForTempRelations() + SessionRelFirstBackendId)
+
+#define IsSessionRelationBackendId(id) ((id) >= SessionRelFirstBackendId)
+
+#define GetRelationBackendId(id) ((id) & ~SessionRelFirstBackendId)
+
 #endif							/* BACKENDID_H */
diff --git a/src/include/storage/bufpage.h b/src/include/storage/bufpage.h
index 4ef6d8d..bac7a31 100644
--- a/src/include/storage/bufpage.h
+++ b/src/include/storage/bufpage.h
@@ -229,6 +229,13 @@ typedef PageHeaderData *PageHeader;
 #define PageIsNew(page) (((PageHeader) (page))->pd_upper == 0)
 
 /*
+ * Page of temporary relation is not initialized
+ */
+#define GlobalTempRelationPageIsNotInitialized(rel, page) \
+	((rel)->rd_rel->relpersistence == RELPERSISTENCE_SESSION && PageIsNew(page))
+
+
+/*
  * PageGetItemId
  *		Returns an item identifier of a page.
  */
diff --git a/src/include/storage/relfilenode.h b/src/include/storage/relfilenode.h
index 586500a..20aec72 100644
--- a/src/include/storage/relfilenode.h
+++ b/src/include/storage/relfilenode.h
@@ -75,10 +75,25 @@ typedef struct RelFileNodeBackend
 	BackendId	backend;
 } RelFileNodeBackend;
 
+/*
+ * Check whether it is local or global temporary relation, which data belongs only to one backend.
+ */
 #define RelFileNodeBackendIsTemp(rnode) \
 	((rnode).backend != InvalidBackendId)
 
 /*
+ * Check whether it is global temporary relation which metadata is shared by all sessions,
+ * but data is private for the current session.
+ */
+#define RelFileNodeBackendIsGlobalTemp(rnode) IsSessionRelationBackendId((rnode).backend)
+
+/*
+ * Check whether it is local temporary relation which exists only in this backend.
+ */
+#define RelFileNodeBackendIsLocalTemp(rnode) \
+	(RelFileNodeBackendIsTemp(rnode) && !RelFileNodeBackendIsGlobalTemp(rnode))
+
+/*
  * Note: RelFileNodeEquals and RelFileNodeBackendEquals compare relNode first
  * since that is most likely to be different in two unequal RelFileNodes.  It
  * is probably redundant to compare spcNode if the other fields are found equal,
diff --git a/src/include/utils/catcache.h b/src/include/utils/catcache.h
index ff1faba..31f615d 100644
--- a/src/include/utils/catcache.h
+++ b/src/include/utils/catcache.h
@@ -228,4 +228,8 @@ extern void PrepareToInvalidateCacheTuple(Relation relation,
 extern void PrintCatCacheLeakWarning(HeapTuple tuple);
 extern void PrintCatCacheListLeakWarning(CatCList *list);
 
+extern void InsertCatCache(CatCache *cache,
+						   Datum v1, Datum v2, Datum v3, Datum v4,
+						   HeapTuple tuple);
+
 #endif							/* CATCACHE_H */
diff --git a/src/include/utils/rel.h b/src/include/utils/rel.h
index 31d8a1a..171717e 100644
--- a/src/include/utils/rel.h
+++ b/src/include/utils/rel.h
@@ -271,6 +271,7 @@ typedef struct StdRdOptions
 	int			parallel_workers;	/* max number of parallel workers */
 	bool		vacuum_index_cleanup;	/* enables index vacuuming and cleanup */
 	bool		vacuum_truncate;	/* enables vacuum to truncate a relation */
+	bool		on_commit_delete_rows;	/* global temp table */
 } StdRdOptions;
 
 #define HEAP_MIN_FILLFACTOR			10
@@ -326,6 +327,18 @@ typedef struct StdRdOptions
 	((relation)->rd_options ? \
 	 ((StdRdOptions *) (relation)->rd_options)->parallel_workers : (defaultpw))
 
+/*
+ * Relation persistence is either TEMP either SESSION
+ */
+#define IsLocalRelpersistence(relpersistence) \
+	((relpersistence) == RELPERSISTENCE_TEMP || (relpersistence) == RELPERSISTENCE_SESSION)
+
+/*
+ * Relation is either global either local temp table
+ */
+#define RelationHasSessionScope(relation) \
+	IsLocalRelpersistence(((relation)->rd_rel->relpersistence))
+
 /* ViewOptions->check_option values */
 typedef enum ViewOptCheckOption
 {
@@ -334,6 +347,7 @@ typedef enum ViewOptCheckOption
 	VIEW_OPTION_CHECK_OPTION_CASCADED
 } ViewOptCheckOption;
 
+
 /*
  * ViewOptions
  *		Contents of rd_options for views
@@ -529,7 +543,7 @@ typedef struct ViewOptions
  *		True if relation's pages are stored in local buffers.
  */
 #define RelationUsesLocalBuffers(relation) \
-	((relation)->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
+	RelationHasSessionScope(relation)
 
 /*
  * RELATION_IS_LOCAL
diff --git a/src/include/utils/syscache.h b/src/include/utils/syscache.h
index 918765c..5b1598b 100644
--- a/src/include/utils/syscache.h
+++ b/src/include/utils/syscache.h
@@ -216,4 +216,8 @@ extern bool RelationSupportsSysCache(Oid relid);
 
 #define ReleaseSysCacheList(x)	ReleaseCatCacheList(x)
 
+
+extern void InsertSysCache(int cacheId, 
+						   Datum v1, Datum v2, Datum v3, Datum v4,
+						   HeapTuple tuple);
 #endif							/* SYSCACHE_H */
diff --git a/src/test/isolation/expected/inherit-global-temp.out b/src/test/isolation/expected/inherit-global-temp.out
new file mode 100644
index 0000000..6114f8c
--- /dev/null
+++ b/src/test/isolation/expected/inherit-global-temp.out
@@ -0,0 +1,218 @@
+Parsed test spec with 2 sessions
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_update_p s1_update_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_update_p: UPDATE inh_global_parent SET a = 11 WHERE a = 1;
+step s1_update_c: UPDATE inh_global_parent SET a = 13 WHERE a IN (3, 5);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+2              
+11             
+4              
+13             
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+4              
+13             
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+2              
+11             
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_update_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_update_c: UPDATE inh_global_parent SET a = 15 WHERE a IN (3, 5);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+6              
+15             
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+6              
+15             
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_delete_p s1_delete_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_delete_p: DELETE FROM inh_global_parent WHERE a = 2;
+step s1_delete_c: DELETE FROM inh_global_parent WHERE a IN (4, 6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+3              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_delete_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_delete_c: DELETE FROM inh_global_parent WHERE a IN (4, 6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+5              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_truncate_p s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_truncate_p s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_truncate_p: TRUNCATE inh_global_parent;
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_begin s1_truncate_p s2_select_p s1_commit
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_begin: BEGIN;
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s2_select_p: SELECT a FROM inh_global_parent; <waiting ...>
+step s1_commit: COMMIT;
+step s2_select_p: <... completed>
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_begin s1_truncate_p s2_select_c s1_commit
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_begin: BEGIN;
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2; <waiting ...>
+step s1_commit: COMMIT;
+step s2_select_c: <... completed>
+a              
+
+5              
+6              
diff --git a/src/test/isolation/isolation_schedule b/src/test/isolation/isolation_schedule
index a2fa192..ef7aa85 100644
--- a/src/test/isolation/isolation_schedule
+++ b/src/test/isolation/isolation_schedule
@@ -88,3 +88,4 @@ test: plpgsql-toast
 test: truncate-conflict
 test: serializable-parallel
 test: serializable-parallel-2
+test: inherit-global-temp
diff --git a/src/test/isolation/specs/inherit-global-temp.spec b/src/test/isolation/specs/inherit-global-temp.spec
new file mode 100644
index 0000000..5e95dd6
--- /dev/null
+++ b/src/test/isolation/specs/inherit-global-temp.spec
@@ -0,0 +1,73 @@
+# This is a copy of the inherit-temp test with little changes for global temporary tables.
+#
+
+setup
+{
+  CREATE TABLE inh_global_parent (a int);
+}
+
+teardown
+{
+  DROP TABLE inh_global_parent;
+}
+
+# Session 1 executes actions which act directly on both the parent and
+# its child.  Abbreviation "c" is used for queries working on the child
+# and "p" on the parent.
+session "s1"
+setup
+{
+  CREATE GLOBAL TEMPORARY TABLE inh_global_temp_child_s1 () INHERITS (inh_global_parent);
+}
+step "s1_begin" { BEGIN; }
+step "s1_truncate_p" { TRUNCATE inh_global_parent; }
+step "s1_select_p" { SELECT a FROM inh_global_parent; }
+step "s1_select_c" { SELECT a FROM inh_global_temp_child_s1; }
+step "s1_insert_p" { INSERT INTO inh_global_parent VALUES (1), (2); }
+step "s1_insert_c" { INSERT INTO inh_global_temp_child_s1 VALUES (3), (4); }
+step "s1_update_p" { UPDATE inh_global_parent SET a = 11 WHERE a = 1; }
+step "s1_update_c" { UPDATE inh_global_parent SET a = 13 WHERE a IN (3, 5); }
+step "s1_delete_p" { DELETE FROM inh_global_parent WHERE a = 2; }
+step "s1_delete_c" { DELETE FROM inh_global_parent WHERE a IN (4, 6); }
+step "s1_commit" { COMMIT; }
+teardown
+{
+  DROP TABLE inh_global_temp_child_s1;
+}
+
+# Session 2 executes actions on the parent which act only on the child.
+session "s2"
+setup
+{
+  CREATE GLOBAL TEMPORARY TABLE inh_global_temp_child_s2 () INHERITS (inh_global_parent);
+}
+step "s2_truncate_p" { TRUNCATE inh_global_parent; }
+step "s2_select_p" { SELECT a FROM inh_global_parent; }
+step "s2_select_c" { SELECT a FROM inh_global_temp_child_s2; }
+step "s2_insert_c" { INSERT INTO inh_global_temp_child_s2 VALUES (5), (6); }
+step "s2_update_c" { UPDATE inh_global_parent SET a = 15 WHERE a IN (3, 5); }
+step "s2_delete_c" { DELETE FROM inh_global_parent WHERE a IN (4, 6); }
+teardown
+{
+  DROP TABLE inh_global_temp_child_s2;
+}
+
+# Check INSERT behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check UPDATE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_update_p" "s1_update_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_update_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check DELETE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_delete_p" "s1_delete_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_delete_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check TRUNCATE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_truncate_p" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_truncate_p" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# TRUNCATE on a parent tree does not block access to temporary child relation
+# of another session, and blocks when scanning the parent.
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_begin" "s1_truncate_p" "s2_select_p" "s1_commit"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_begin" "s1_truncate_p" "s2_select_c" "s1_commit"
diff --git a/src/test/regress/expected/global_temp.out b/src/test/regress/expected/global_temp.out
new file mode 100644
index 0000000..ae1adb6
--- /dev/null
+++ b/src/test/regress/expected/global_temp.out
@@ -0,0 +1,247 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+-- Test ON COMMIT DELETE ROWS
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+   2
+(2 rows)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+(1 row)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+ col 
+-----
+   1
+(1 row)
+
+SELECT * FROM global_temptest2;
+ col 
+-----
+(0 rows)
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+ERROR:  unsupported ON COMMIT and foreign key combination
+DETAIL:  Table "global_temptest4" references "global_temptest3", but they do not have the same ON COMMIT setting.
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+ a 
+---
+(0 rows)
+
+DROP TABLE temp_parted_oncommit;
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+              relname              
+-----------------------------------
+ global_temp_parted_oncommit_test
+ global_temp_parted_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_parted_oncommit_test;
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+            relname             
+--------------------------------
+ global_temp_inh_oncommit_test
+ global_temp_inh_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ERROR:  cannot inherit from temporary relation "global_temp_table"
+ROLLBACK;
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM global_temp_table;
+ a 
+---
+ 1
+(1 row)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+(2 rows)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       1
+(1 row)
+
+\c
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+(0 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       2
+(1 row)
+
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       3
+(1 row)
+
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
diff --git a/src/test/regress/expected/rules.out b/src/test/regress/expected/rules.out
index c9cc569..8c21b00 100644
--- a/src/test/regress/expected/rules.out
+++ b/src/test/regress/expected/rules.out
@@ -1348,6 +1348,40 @@ pg_group| SELECT pg_authid.rolname AS groname,
           WHERE (pg_auth_members.roleid = pg_authid.oid)) AS grolist
    FROM pg_authid
   WHERE (NOT pg_authid.rolcanlogin);
+pg_gtt_statistic| SELECT s.starelid,
+    s.staattnum,
+    s.stainherit,
+    s.stanullfrac,
+    s.stawidth,
+    s.stadistinct,
+    s.stakind1,
+    s.stakind2,
+    s.stakind3,
+    s.stakind4,
+    s.stakind5,
+    s.staop1,
+    s.staop2,
+    s.staop3,
+    s.staop4,
+    s.staop5,
+    s.stacoll1,
+    s.stacoll2,
+    s.stacoll3,
+    s.stacoll4,
+    s.stacoll5,
+    s.stanumbers1,
+    s.stanumbers2,
+    s.stanumbers3,
+    s.stanumbers4,
+    s.stanumbers5,
+    s.stavalues1,
+    s.stavalues2,
+    s.stavalues3,
+    s.stavalues4,
+    s.stavalues5
+   FROM pg_class c,
+    LATERAL pg_gtt_statistic_for_relation(c.oid) s(starelid, staattnum, stainherit, stanullfrac, stawidth, stadistinct, stakind1, stakind2, stakind3, stakind4, stakind5, staop1, staop2, staop3, staop4, staop5, stacoll1, stacoll2, stacoll3, stacoll4, stacoll5, stanumbers1, stanumbers2, stanumbers3, stanumbers4, stanumbers5, stavalues1, stavalues2, stavalues3, stavalues4, stavalues5)
+  WHERE (c.relpersistence = 's'::"char");
 pg_hba_file_rules| SELECT a.line_number,
     a.type,
     a.database,
diff --git a/src/test/regress/expected/session_table.out b/src/test/regress/expected/session_table.out
new file mode 100644
index 0000000..1b9b3f4
--- /dev/null
+++ b/src/test/regress/expected/session_table.out
@@ -0,0 +1,64 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+ count 
+-------
+ 10000
+(1 row)
+
+\c
+select count(*) from my_private_table;
+ count 
+-------
+     0
+(1 row)
+
+select * from my_private_table where x=10001;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select * from my_private_table where y=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select count(*) from my_private_table;
+ count  
+--------
+ 100000
+(1 row)
+
+\c
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+   x    |   y    
+--------+--------
+ 100000 | 100000
+(1 row)
+
+drop table  my_private_table;
diff --git a/src/test/regress/parallel_schedule b/src/test/regress/parallel_schedule
index d33a4e1..bda6854 100644
--- a/src/test/regress/parallel_schedule
+++ b/src/test/regress/parallel_schedule
@@ -107,7 +107,7 @@ test: json jsonb json_encoding jsonpath jsonpath_encoding jsonb_jsonpath
 # NB: temp.sql does a reconnect which transiently uses 2 connections,
 # so keep this parallel group to at most 19 tests
 # ----------
-test: plancache limit plpgsql copy2 temp domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
+test: plancache limit plpgsql copy2 temp global_temp session_table domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
 
 # ----------
 # Another group of parallel tests
diff --git a/src/test/regress/serial_schedule b/src/test/regress/serial_schedule
index f86f5c5..f94b32b 100644
--- a/src/test/regress/serial_schedule
+++ b/src/test/regress/serial_schedule
@@ -172,6 +172,8 @@ test: limit
 test: plpgsql
 test: copy2
 test: temp
+test: global_temp
+test: session_table
 test: domain
 test: rangefuncs
 test: prepare
diff --git a/src/test/regress/sql/global_temp.sql b/src/test/regress/sql/global_temp.sql
new file mode 100644
index 0000000..3058b9b
--- /dev/null
+++ b/src/test/regress/sql/global_temp.sql
@@ -0,0 +1,151 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+
+-- Test ON COMMIT DELETE ROWS
+
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+SELECT * FROM global_temptest2;
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+DROP TABLE temp_parted_oncommit;
+
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+DROP TABLE global_temp_parted_oncommit_test;
+
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ROLLBACK;
+
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+COMMIT;
+SELECT * FROM global_temp_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+COMMIT;
+SELECT * FROM normal_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+\c
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
diff --git a/src/test/regress/sql/session_table.sql b/src/test/regress/sql/session_table.sql
new file mode 100644
index 0000000..c6663dc
--- /dev/null
+++ b/src/test/regress/sql/session_table.sql
@@ -0,0 +1,18 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+\c
+select count(*) from my_private_table;
+select * from my_private_table where x=10001;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+select * from my_private_table where y=10001;
+select count(*) from my_private_table;
+\c
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+drop table  my_private_table;

diff --git a/contrib/pg_prewarm/pg_prewarm.c b/contrib/pg_prewarm/pg_prewarm.c
index 33e2d28b27..93059ef581 100644
--- a/contrib/pg_prewarm/pg_prewarm.c
+++ b/contrib/pg_prewarm/pg_prewarm.c
@@ -178,7 +178,7 @@ pg_prewarm(PG_FUNCTION_ARGS)
 		for (block = first_block; block <= last_block; ++block)
 		{
 			CHECK_FOR_INTERRUPTS();
-			smgrread(rel->rd_smgr, forkNumber, block, blockbuffer.data);
+			smgrread(rel->rd_smgr, forkNumber, block, blockbuffer.data, false);
 			++blocks_done;
 		}
 	}
diff --git a/src/backend/access/common/reloptions.c b/src/backend/access/common/reloptions.c
index 79430d2b7b..39baddc743 100644
--- a/src/backend/access/common/reloptions.c
+++ b/src/backend/access/common/reloptions.c
@@ -158,6 +158,19 @@ static relopt_bool boolRelOpts[] =
 		},
 		true
 	},
+	/*
+	 * For global temp table only
+	 * use AccessExclusiveLock for ensure safety
+	 */
+	{
+		{
+			"on_commit_delete_rows",
+			"global temp table on commit options",
+			RELOPT_KIND_HEAP | RELOPT_KIND_PARTITIONED,
+			ShareUpdateExclusiveLock
+		},
+		false
+	},
 	/* list terminator */
 	{{NULL}}
 };
@@ -1486,6 +1499,8 @@ bytea *
 default_reloptions(Datum reloptions, bool validate, relopt_kind kind)
 {
 	static const relopt_parse_elt tab[] = {
+		{"on_commit_delete_rows", RELOPT_TYPE_BOOL,
+		offsetof(StdRdOptions, on_commit_delete_rows)},
 		{"fillfactor", RELOPT_TYPE_INT, offsetof(StdRdOptions, fillfactor)},
 		{"autovacuum_enabled", RELOPT_TYPE_BOOL,
 		offsetof(StdRdOptions, autovacuum) + offsetof(AutoVacOpts, enabled)},
@@ -1586,13 +1601,17 @@ build_reloptions(Datum reloptions, bool validate,
 bytea *
 partitioned_table_reloptions(Datum reloptions, bool validate)
 {
+	static const relopt_parse_elt tab[] = {
+		{"on_commit_delete_rows", RELOPT_TYPE_BOOL,
+		offsetof(StdRdOptions, on_commit_delete_rows)}
+	};
 	/*
 	 * There are no options for partitioned tables yet, but this is able to do
 	 * some validation.
 	 */
 	return (bytea *) build_reloptions(reloptions, validate,
 									  RELOPT_KIND_PARTITIONED,
-									  0, NULL, 0);
+									  sizeof(StdRdOptions), tab, lengthof(tab));
 }
 
 /*
diff --git a/src/backend/access/heap/heapam_handler.c b/src/backend/access/heap/heapam_handler.c
index 3fa4b766db..a86de5046f 100644
--- a/src/backend/access/heap/heapam_handler.c
+++ b/src/backend/access/heap/heapam_handler.c
@@ -670,6 +670,7 @@ heapam_relation_copy_data(Relation rel, const RelFileNode *newrnode)
 			 * init fork of an unlogged relation.
 			 */
 			if (rel->rd_rel->relpersistence == RELPERSISTENCE_PERMANENT ||
+				rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ||
 				(rel->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED &&
 				 forkNum == INIT_FORKNUM))
 				log_smgrcreate(newrnode, forkNum);
diff --git a/src/backend/catalog/catalog.c b/src/backend/catalog/catalog.c
index 7d6acaed92..7c48e5c2ae 100644
--- a/src/backend/catalog/catalog.c
+++ b/src/backend/catalog/catalog.c
@@ -396,6 +396,9 @@ GetNewRelFileNode(Oid reltablespace, Relation pg_class, char relpersistence)
 		case RELPERSISTENCE_TEMP:
 			backend = BackendIdForTempRelations();
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 8880586c37..22ce8953fd 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3707,7 +3707,7 @@ reindex_relation(Oid relid, int flags, int options)
 		if (flags & REINDEX_REL_FORCE_INDEXES_UNLOGGED)
 			persistence = RELPERSISTENCE_UNLOGGED;
 		else if (flags & REINDEX_REL_FORCE_INDEXES_PERMANENT)
-			persistence = RELPERSISTENCE_PERMANENT;
+			persistence = rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ? RELPERSISTENCE_SESSION : RELPERSISTENCE_PERMANENT;
 		else
 			persistence = rel->rd_rel->relpersistence;
 
diff --git a/src/backend/catalog/storage.c b/src/backend/catalog/storage.c
index fddfbf1d8c..97478352ea 100644
--- a/src/backend/catalog/storage.c
+++ b/src/backend/catalog/storage.c
@@ -92,6 +92,10 @@ RelationCreateStorage(RelFileNode rnode, char relpersistence)
 			backend = InvalidBackendId;
 			needs_wal = false;
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			needs_wal = false;
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
 			needs_wal = true;
@@ -367,7 +371,7 @@ RelationCopyStorage(SMgrRelation src, SMgrRelation dst,
 		/* If we got a cancel signal during the copy of the data, quit */
 		CHECK_FOR_INTERRUPTS();
 
-		smgrread(src, forkNum, blkno, buf.data);
+		smgrread(src, forkNum, blkno, buf.data, false);
 
 		if (!PageIsVerified(page, blkno))
 			ereport(ERROR,
diff --git a/src/backend/catalog/system_views.sql b/src/backend/catalog/system_views.sql
index c9e6060035..1f5e52b54a 100644
--- a/src/backend/catalog/system_views.sql
+++ b/src/backend/catalog/system_views.sql
@@ -1369,7 +1369,15 @@ LANGUAGE INTERNAL
 STRICT STABLE PARALLEL SAFE
 AS 'jsonb_path_query_first_tz';
 
+
+--
+-- Statistic for global temporary tables
 --
+
+CREATE VIEW pg_gtt_statistic AS
+   SELECT s.* from pg_class c,pg_gtt_statistic_for_relation(c.oid) s where c.relpersistence='s';
+
+
 -- The default permissions for functions mean that anyone can execute them.
 -- A number of functions shouldn't be executable by just anyone, but rather
 -- than use explicit 'superuser()' checks in those functions, we use the GRANT
diff --git a/src/backend/commands/analyze.c b/src/backend/commands/analyze.c
index c4420ddd7f..85d8f04eeb 100644
--- a/src/backend/commands/analyze.c
+++ b/src/backend/commands/analyze.c
@@ -40,6 +40,7 @@
 #include "commands/vacuum.h"
 #include "executor/executor.h"
 #include "foreign/fdwapi.h"
+#include "funcapi.h"
 #include "miscadmin.h"
 #include "nodes/nodeFuncs.h"
 #include "parser/parse_oper.h"
@@ -103,7 +104,7 @@ static int	acquire_inherited_sample_rows(Relation onerel, int elevel,
 										  HeapTuple *rows, int targrows,
 										  double *totalrows, double *totaldeadrows);
 static void update_attstats(Oid relid, bool inh,
-							int natts, VacAttrStats **vacattrstats);
+							int natts, VacAttrStats **vacattrstats, bool is_global_temp);
 static Datum std_fetch_func(VacAttrStatsP stats, int rownum, bool *isNull);
 static Datum ind_fetch_func(VacAttrStatsP stats, int rownum, bool *isNull);
 
@@ -323,6 +324,7 @@ do_analyze_rel(Relation onerel, VacuumParams *params,
 	Oid			save_userid;
 	int			save_sec_context;
 	int			save_nestlevel;
+	bool        is_global_temp = onerel->rd_rel->relpersistence == RELPERSISTENCE_SESSION;
 
 	if (inh)
 		ereport(elevel,
@@ -586,14 +588,14 @@ do_analyze_rel(Relation onerel, VacuumParams *params,
 		 * pg_statistic for columns we didn't process, we leave them alone.)
 		 */
 		update_attstats(RelationGetRelid(onerel), inh,
-						attr_cnt, vacattrstats);
+						attr_cnt, vacattrstats, is_global_temp);
 
 		for (ind = 0; ind < nindexes; ind++)
 		{
 			AnlIndexData *thisdata = &indexdata[ind];
 
 			update_attstats(RelationGetRelid(Irel[ind]), false,
-							thisdata->attr_cnt, thisdata->vacattrstats);
+							thisdata->attr_cnt, thisdata->vacattrstats, is_global_temp);
 		}
 
 		/*
@@ -1456,7 +1458,7 @@ acquire_inherited_sample_rows(Relation onerel, int elevel,
  *		by taking a self-exclusive lock on the relation in analyze_rel().
  */
 static void
-update_attstats(Oid relid, bool inh, int natts, VacAttrStats **vacattrstats)
+update_attstats(Oid relid, bool inh, int natts, VacAttrStats **vacattrstats, bool is_global_temp)
 {
 	Relation	sd;
 	int			attno;
@@ -1558,30 +1560,42 @@ update_attstats(Oid relid, bool inh, int natts, VacAttrStats **vacattrstats)
 			}
 		}
 
-		/* Is there already a pg_statistic tuple for this attribute? */
-		oldtup = SearchSysCache3(STATRELATTINH,
-								 ObjectIdGetDatum(relid),
-								 Int16GetDatum(stats->attr->attnum),
-								 BoolGetDatum(inh));
-
-		if (HeapTupleIsValid(oldtup))
+		if (is_global_temp)
 		{
-			/* Yes, replace it */
-			stup = heap_modify_tuple(oldtup,
-									 RelationGetDescr(sd),
-									 values,
-									 nulls,
-									 replaces);
-			ReleaseSysCache(oldtup);
-			CatalogTupleUpdate(sd, &stup->t_self, stup);
+			stup = heap_form_tuple(RelationGetDescr(sd), values, nulls);
+			InsertSysCache(STATRELATTINH,
+						   ObjectIdGetDatum(relid),
+						   Int16GetDatum(stats->attr->attnum),
+						   BoolGetDatum(inh),
+						   0,
+						   stup);
 		}
 		else
 		{
-			/* No, insert new tuple */
-			stup = heap_form_tuple(RelationGetDescr(sd), values, nulls);
-			CatalogTupleInsert(sd, stup);
-		}
+			/* Is there already a pg_statistic tuple for this attribute? */
+			oldtup = SearchSysCache3(STATRELATTINH,
+									 ObjectIdGetDatum(relid),
+									 Int16GetDatum(stats->attr->attnum),
+									 BoolGetDatum(inh));
 
+			if (HeapTupleIsValid(oldtup))
+			{
+				/* Yes, replace it */
+				stup = heap_modify_tuple(oldtup,
+										 RelationGetDescr(sd),
+										 values,
+										 nulls,
+										 replaces);
+				ReleaseSysCache(oldtup);
+				CatalogTupleUpdate(sd, &stup->t_self, stup);
+			}
+			else
+			{
+				/* No, insert new tuple */
+				stup = heap_form_tuple(RelationGetDescr(sd), values, nulls);
+				CatalogTupleInsert(sd, stup);
+			}
+		}
 		heap_freetuple(stup);
 	}
 
@@ -2890,3 +2904,72 @@ analyze_mcv_list(int *mcv_counts,
 	}
 	return num_mcv;
 }
+
+PG_FUNCTION_INFO_V1(pg_gtt_statistic_for_relation);
+
+typedef struct
+{
+	int staattnum;
+	bool stainherit;
+} PgTempStatIteratorCtx;
+
+Datum
+pg_gtt_statistic_for_relation(PG_FUNCTION_ARGS)
+{
+	Oid starelid = PG_GETARG_OID(0);
+	ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
+	Tuplestorestate *tupstore;
+	MemoryContext per_query_ctx;
+	MemoryContext oldcontext;
+	TupleDesc	  tupdesc;
+	bool stainherit = false;
+
+	/* check to see if caller supports us returning a tuplestore */
+	if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
+		elog(ERROR, "return type must be a row type");
+
+	/* check to see if caller supports us returning a tuplestore */
+	if (rsinfo == NULL || !IsA(rsinfo, ReturnSetInfo))
+		ereport(ERROR,
+				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+				 errmsg("set-valued function called in context that cannot accept a set")));
+	if (!(rsinfo->allowedModes & SFRM_Materialize))
+		ereport(ERROR,
+				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+				 errmsg("materialize mode required, but it is not " \
+						"allowed in this context")));
+
+	/* Build tuplestore to hold the result rows */
+	per_query_ctx = rsinfo->econtext->ecxt_per_query_memory;
+	oldcontext = MemoryContextSwitchTo(per_query_ctx);
+
+	/* Build a tuple descriptor for our result type */
+
+	tupstore = tuplestore_begin_heap(true, false, work_mem);
+	rsinfo->returnMode = SFRM_Materialize;
+	rsinfo->setResult = tupstore;
+	rsinfo->setDesc = tupdesc;
+
+	do
+	{
+		int staattnum = 0;
+		while (true)
+		{
+			HeapTuple statup = SearchSysCacheCopy3(STATRELATTINH,
+												   ObjectIdGetDatum(starelid),
+												   Int16GetDatum(++staattnum),
+												   BoolGetDatum(stainherit));
+			if (statup != NULL)
+				tuplestore_puttuple(tupstore, statup);
+			else
+				break;
+		}
+		stainherit = !stainherit;
+	} while (stainherit);
+
+	MemoryContextSwitchTo(oldcontext);
+ 
+	tuplestore_donestoring(tupstore);
+
+	return (Datum) 0;
+}
diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index e9d7a7ff79..a22a77aa5e 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -391,6 +391,13 @@ cluster_rel(Oid tableOid, Oid indexOid, int options)
 					 errmsg("cannot vacuum temporary tables of other sessions")));
 	}
 
+	/* not support cluster global temp table yet */
+	if (OldHeap->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
+		ereport(ERROR,
+				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+				errmsg("not support cluster global temporary tables yet")));
+
+
 	/*
 	 * Also check for active uses of the relation in the current transaction,
 	 * including open scans and pending AFTER trigger events.
@@ -1399,7 +1406,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap,
 	 */
 	if (newrelpersistence == RELPERSISTENCE_UNLOGGED)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_UNLOGGED;
-	else if (newrelpersistence == RELPERSISTENCE_PERMANENT)
+	else if (newrelpersistence != RELPERSISTENCE_TEMP)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_PERMANENT;
 
 	/* Report that we are now reindexing relations */
diff --git a/src/backend/commands/sequence.c b/src/backend/commands/sequence.c
index 6aab73bfd4..bc3c986096 100644
--- a/src/backend/commands/sequence.c
+++ b/src/backend/commands/sequence.c
@@ -94,7 +94,7 @@ static HTAB *seqhashtab = NULL; /* hash table for SeqTable items */
  */
 static SeqTableData *last_used_seq = NULL;
 
-static void fill_seq_with_data(Relation rel, HeapTuple tuple);
+static void fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf);
 static Relation lock_and_open_sequence(SeqTable seq);
 static void create_seq_hashtable(void);
 static void init_sequence(Oid relid, SeqTable *p_elm, Relation *p_rel);
@@ -222,7 +222,7 @@ DefineSequence(ParseState *pstate, CreateSeqStmt *seq)
 
 	/* now initialize the sequence's data */
 	tuple = heap_form_tuple(tupDesc, value, null);
-	fill_seq_with_data(rel, tuple);
+	fill_seq_with_data(rel, tuple, InvalidBuffer);
 
 	/* process OWNED BY if given */
 	if (owned_by)
@@ -327,7 +327,7 @@ ResetSequence(Oid seq_relid)
 	/*
 	 * Insert the modified tuple into the new storage file.
 	 */
-	fill_seq_with_data(seq_rel, tuple);
+	fill_seq_with_data(seq_rel, tuple, InvalidBuffer);
 
 	/* Clear local cache so that we don't think we have cached numbers */
 	/* Note that we do not change the currval() state */
@@ -340,18 +340,21 @@ ResetSequence(Oid seq_relid)
  * Initialize a sequence's relation with the specified tuple as content
  */
 static void
-fill_seq_with_data(Relation rel, HeapTuple tuple)
+fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf)
 {
-	Buffer		buf;
 	Page		page;
 	sequence_magic *sm;
 	OffsetNumber offnum;
+	bool lockBuffer = false;
 
 	/* Initialize first page of relation with special magic number */
 
-	buf = ReadBuffer(rel, P_NEW);
-	Assert(BufferGetBlockNumber(buf) == 0);
-
+	if (buf == InvalidBuffer)
+	{
+		buf = ReadBuffer(rel, P_NEW);
+		Assert(BufferGetBlockNumber(buf) == 0);
+		lockBuffer = true;
+	}
 	page = BufferGetPage(buf);
 
 	PageInit(page, BufferGetPageSize(buf), sizeof(sequence_magic));
@@ -360,7 +363,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	/* Now insert sequence tuple */
 
-	LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
+	if (lockBuffer)
+		LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
 
 	/*
 	 * Since VACUUM does not process sequences, we have to force the tuple to
@@ -410,7 +414,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	END_CRIT_SECTION();
 
-	UnlockReleaseBuffer(buf);
+	if (lockBuffer)
+		UnlockReleaseBuffer(buf);
 }
 
 /*
@@ -502,7 +507,7 @@ AlterSequence(ParseState *pstate, AlterSeqStmt *stmt)
 		/*
 		 * Insert the modified tuple into the new storage file.
 		 */
-		fill_seq_with_data(seqrel, newdatatuple);
+		fill_seq_with_data(seqrel, newdatatuple, InvalidBuffer);
 	}
 
 	/* process OWNED BY if given */
@@ -1178,6 +1183,17 @@ read_seq_tuple(Relation rel, Buffer *buf, HeapTuple seqdatatuple)
 	LockBuffer(*buf, BUFFER_LOCK_EXCLUSIVE);
 
 	page = BufferGetPage(*buf);
+	if (GlobalTempRelationPageIsNotInitialized(rel, page))
+	{
+		/* Initialize sequence for global temporary tables */
+		Datum		value[SEQ_COL_LASTCOL] = {0};
+		bool		null[SEQ_COL_LASTCOL] = {false};
+		HeapTuple tuple;
+		value[SEQ_COL_LASTVAL-1] = Int64GetDatumFast(1); /* start sequence with 1 */
+		tuple = heap_form_tuple(RelationGetDescr(rel), value, null);
+		fill_seq_with_data(rel, tuple, *buf);
+	}
+
 	sm = (sequence_magic *) PageGetSpecialPointer(page);
 
 	if (sm->magic != SEQ_MAGIC)
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index f599393473..1e4a52ee3f 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -12,6 +12,9 @@
  *
  *-------------------------------------------------------------------------
  */
+#include <sys/stat.h>
+#include <unistd.h>
+
 #include "postgres.h"
 
 #include "access/attmap.h"
@@ -555,6 +558,23 @@ static List *GetParentedForeignKeyRefs(Relation partition);
 static void ATDetachCheckNoForeignKeyRefs(Relation partition);
 
 
+static bool
+has_oncommit_option(List *options)
+{
+	ListCell   *listptr;
+
+	foreach(listptr, options)
+	{
+		DefElem    *def = (DefElem *) lfirst(listptr);
+
+		if (pg_strcasecmp(def->defname, "on_commit_delete_rows") == 0)
+			return true;
+	}
+
+	return false;
+}
+
+
 /* ----------------------------------------------------------------
  *		DefineRelation
  *				Creates a new relation.
@@ -598,6 +618,7 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 	LOCKMODE	parentLockmode;
 	const char *accessMethod = NULL;
 	Oid			accessMethodId = InvalidOid;
+	bool		has_oncommit_clause = false;
 
 	/*
 	 * Truncate relname to appropriate length (probably a waste of time, as
@@ -609,7 +630,7 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 	 * Check consistency of arguments
 	 */
 	if (stmt->oncommit != ONCOMMIT_NOOP
-		&& stmt->relation->relpersistence != RELPERSISTENCE_TEMP)
+		&& !IsLocalRelpersistence(stmt->relation->relpersistence))
 		ereport(ERROR,
 				(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 				 errmsg("ON COMMIT can only be used on temporary tables")));
@@ -634,17 +655,6 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 	namespaceId =
 		RangeVarGetAndCheckCreationNamespace(stmt->relation, NoLock, NULL);
 
-	/*
-	 * Security check: disallow creating temp tables from security-restricted
-	 * code.  This is needed because calling code might not expect untrusted
-	 * tables to appear in pg_temp at the front of its search path.
-	 */
-	if (stmt->relation->relpersistence == RELPERSISTENCE_TEMP
-		&& InSecurityRestrictedOperation())
-		ereport(ERROR,
-				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
-				 errmsg("cannot create temporary table within security-restricted operation")));
-
 	/*
 	 * Determine the lockmode to use when scanning parents.  A self-exclusive
 	 * lock is needed here.
@@ -740,6 +750,38 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 	/*
 	 * Parse and validate reloptions, if any.
 	 */
+	/* global temp table */
+	has_oncommit_clause = has_oncommit_option(stmt->options);
+	if (stmt->relation->relpersistence == RELPERSISTENCE_SESSION)
+	{
+		if (has_oncommit_clause)
+		{
+			if (stmt->oncommit != ONCOMMIT_NOOP)
+				elog(ERROR, "can not defeine global temp table with on commit and with clause at same time");
+		}
+		else if (stmt->oncommit != ONCOMMIT_NOOP)
+		{
+			DefElem *opt = makeNode(DefElem);
+
+			opt->type = T_DefElem;
+			opt->defnamespace = NULL;
+			opt->defname = "on_commit_delete_rows";
+			opt->defaction = DEFELEM_UNSPEC;
+
+			/* use reloptions to remember on commit clause */
+			if (stmt->oncommit == ONCOMMIT_DELETE_ROWS)
+				opt->arg  = (Node *)makeString("true");
+			else if (stmt->oncommit == ONCOMMIT_PRESERVE_ROWS)
+				opt->arg  = (Node *)makeString("false");
+			else
+				elog(ERROR, "global temp table not support on commit drop clause");
+
+			stmt->options = lappend(stmt->options, opt);
+		}
+	}
+	else if (has_oncommit_clause)
+		elog(ERROR, "regular table cannot specifie on_commit_delete_rows");
+
 	reloptions = transformRelOptions((Datum) 0, stmt->options, NULL, validnsps,
 									 true, false);
 
@@ -1824,7 +1866,8 @@ ExecuteTruncateGuts(List *explicit_rels, List *relids, List *relids_logged,
 		 * table or the current physical file to be thrown away anyway.
 		 */
 		if (rel->rd_createSubid == mySubid ||
-			rel->rd_newRelfilenodeSubid == mySubid)
+			rel->rd_newRelfilenodeSubid == mySubid ||
+			rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
 		{
 			/* Immediate, non-rollbackable truncation is OK */
 			heap_truncate_one_rel(rel);
@@ -3511,6 +3554,26 @@ AlterTableLookupRelation(AlterTableStmt *stmt, LOCKMODE lockmode)
 									(void *) stmt);
 }
 
+
+static bool
+CheckGlobalTempTableNotInUse(Relation rel)
+{
+	int id;
+	for (id = 1; id <= MaxBackends; id++)
+	{
+		if (id != MyBackendId)
+		{
+			struct stat fst;
+			char* path = relpathbackend(rel->rd_node, id, MAIN_FORKNUM);
+			int rc = stat(path, &fst);
+			pfree(path);
+			if (rc == 0 && fst.st_size != 0)
+				return false;
+		}
+	}
+	return true;
+}
+
 /*
  * AlterTable
  *		Execute ALTER TABLE, which can be a list of subcommands
@@ -3568,6 +3631,9 @@ AlterTable(AlterTableStmt *stmt, LOCKMODE lockmode,
 	rel = relation_open(context->relid, NoLock);
 
 	CheckTableNotInUse(rel, "ALTER TABLE");
+	if (rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION
+		&& !CheckGlobalTempTableNotInUse(rel))
+		elog(ERROR, "Global temp table used by active backends can not be altered");
 
 	ATController(stmt, rel, stmt->cmds, stmt->relation->inh, lockmode, context);
 }
@@ -8169,6 +8235,12 @@ ATAddForeignKeyConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
 						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 						 errmsg("constraints on unlogged tables may reference only permanent or unlogged tables")));
 			break;
+		case RELPERSISTENCE_SESSION:
+			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
+				ereport(ERROR,
+						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+						 errmsg("constraints on session tables may reference only session tables")));
+			break;
 		case RELPERSISTENCE_TEMP:
 			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_TEMP)
 				ereport(ERROR,
@@ -14629,6 +14701,13 @@ ATPrepChangePersistence(Relation rel, bool toLogged)
 							RelationGetRelationName(rel)),
 					 errtable(rel)));
 			break;
+		case RELPERSISTENCE_SESSION:
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+					 errmsg("cannot change logged status of session table \"%s\"",
+							RelationGetRelationName(rel)),
+					 errtable(rel)));
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			if (toLogged)
 				/* nothing to do */
@@ -15116,14 +15195,7 @@ PreCommit_on_commit_actions(void)
 				/* Do nothing (there shouldn't be such entries, actually) */
 				break;
 			case ONCOMMIT_DELETE_ROWS:
-
-				/*
-				 * If this transaction hasn't accessed any temporary
-				 * relations, we can skip truncating ON COMMIT DELETE ROWS
-				 * tables, as they must still be empty.
-				 */
-				if ((MyXactFlags & XACT_FLAGS_ACCESSEDTEMPNAMESPACE))
-					oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
+				oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
 				break;
 			case ONCOMMIT_DROP:
 				oids_to_drop = lappend_oid(oids_to_drop, oc->relid);
diff --git a/src/backend/optimizer/path/allpaths.c b/src/backend/optimizer/path/allpaths.c
index 8286d9cf34..7a12635e9c 100644
--- a/src/backend/optimizer/path/allpaths.c
+++ b/src/backend/optimizer/path/allpaths.c
@@ -48,6 +48,7 @@
 #include "partitioning/partprune.h"
 #include "rewrite/rewriteManip.h"
 #include "utils/lsyscache.h"
+#include "utils/rel.h"
 
 
 /* results of subquery_is_pushdown_safe */
@@ -618,7 +619,7 @@ set_rel_consider_parallel(PlannerInfo *root, RelOptInfo *rel,
 			 * the rest of the necessary infrastructure right now anyway.  So
 			 * for now, bail out if we see a temporary table.
 			 */
-			if (get_rel_persistence(rte->relid) == RELPERSISTENCE_TEMP)
+			if (IsLocalRelpersistence(get_rel_persistence(rte->relid)))
 				return;
 
 			/*
diff --git a/src/backend/optimizer/plan/planner.c b/src/backend/optimizer/plan/planner.c
index d6f2153593..fd4e713646 100644
--- a/src/backend/optimizer/plan/planner.c
+++ b/src/backend/optimizer/plan/planner.c
@@ -6312,7 +6312,7 @@ plan_create_index_workers(Oid tableOid, Oid indexOid)
 	 * Furthermore, any index predicate or index expressions must be parallel
 	 * safe.
 	 */
-	if (heap->rd_rel->relpersistence == RELPERSISTENCE_TEMP ||
+	if (RelationHasSessionScope(heap) ||
 		!is_parallel_safe(root, (Node *) RelationGetIndexExpressions(index)) ||
 		!is_parallel_safe(root, (Node *) RelationGetIndexPredicate(index)))
 	{
diff --git a/src/backend/optimizer/util/plancat.c b/src/backend/optimizer/util/plancat.c
index d82fc5ab8b..95062ae344 100644
--- a/src/backend/optimizer/util/plancat.c
+++ b/src/backend/optimizer/util/plancat.c
@@ -28,6 +28,7 @@
 #include "catalog/catalog.h"
 #include "catalog/dependency.h"
 #include "catalog/heap.h"
+#include "catalog/index.h"
 #include "catalog/pg_am.h"
 #include "catalog/pg_proc.h"
 #include "catalog/pg_statistic_ext.h"
@@ -46,6 +47,7 @@
 #include "rewrite/rewriteManip.h"
 #include "statistics/statistics.h"
 #include "storage/bufmgr.h"
+#include "storage/buf_internals.h"
 #include "utils/builtins.h"
 #include "utils/lsyscache.h"
 #include "utils/partcache.h"
@@ -80,6 +82,28 @@ static void set_baserel_partition_key_exprs(Relation relation,
 static void set_baserel_partition_constraint(Relation relation,
 											 RelOptInfo *rel);
 
+static bool
+is_index_valid(Relation index)
+{
+	if (!index->rd_index->indisvalid)
+		return false;
+
+	if (index->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
+	{
+		Buffer metapage = ReadBuffer(index, 0);
+		bool isNew = PageIsNew(BufferGetPage(metapage));
+		ReleaseBuffer(metapage);
+		if (isNew)
+		{
+			Relation heap;
+			DropRelFileNodeAllLocalBuffers(index->rd_smgr->smgr_rnode.node);
+			heap = RelationIdGetRelation(index->rd_index->indrelid);
+			index->rd_indam->ambuild(heap, index, BuildIndexInfo(index));
+			RelationClose(heap);
+		}
+	}
+	return true;
+}
 
 /*
  * get_relation_info -
@@ -205,7 +229,7 @@ get_relation_info(PlannerInfo *root, Oid relationObjectId, bool inhparent,
 			 * still needs to insert into "invalid" indexes, if they're marked
 			 * indisready.
 			 */
-			if (!index->indisvalid)
+			if (!is_index_valid(indexRelation))
 			{
 				index_close(indexRelation, NoLock);
 				continue;
@@ -704,7 +728,7 @@ infer_arbiter_indexes(PlannerInfo *root)
 		idxRel = index_open(indexoid, rte->rellockmode);
 		idxForm = idxRel->rd_index;
 
-		if (!idxForm->indisvalid)
+		if (!is_index_valid(idxRel))
 			goto next;
 
 		/*
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index 1b0edf5d3d..787de8329a 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -3288,20 +3288,11 @@ OptTemp:	TEMPORARY					{ $$ = RELPERSISTENCE_TEMP; }
 			| TEMP						{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMPORARY			{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMP				{ $$ = RELPERSISTENCE_TEMP; }
-			| GLOBAL TEMPORARY
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
-			| GLOBAL TEMP
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
+			| GLOBAL TEMPORARY          { $$ = RELPERSISTENCE_SESSION; }
+			| GLOBAL TEMP               { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION                   { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMPORARY         { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMP              { $$ = RELPERSISTENCE_SESSION; }
 			| UNLOGGED					{ $$ = RELPERSISTENCE_UNLOGGED; }
 			| /*EMPTY*/					{ $$ = RELPERSISTENCE_PERMANENT; }
 		;
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index ee2d2b54a1..e7f3a20fc4 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -437,6 +437,14 @@ generateSerialExtraStmts(CreateStmtContext *cxt, ColumnDef *column,
 	seqstmt->sequence = makeRangeVar(snamespace, sname, -1);
 	seqstmt->options = seqoptions;
 
+	/*
+	 * Why we should not always use persistence of parent table?
+	 * Although it is prohibited to have unlogged sequences,
+	 * unlogged tables with SERIAL fields are accepted!
+	 */
+	if (cxt->relation->relpersistence != RELPERSISTENCE_UNLOGGED)
+		seqstmt->sequence->relpersistence = cxt->relation->relpersistence;
+
 	/*
 	 * If a sequence data type was specified, add it to the options.  Prepend
 	 * to the list rather than append; in case a user supplied their own AS
diff --git a/src/backend/postmaster/autovacuum.c b/src/backend/postmaster/autovacuum.c
index 6d1f28c327..4074344030 100644
--- a/src/backend/postmaster/autovacuum.c
+++ b/src/backend/postmaster/autovacuum.c
@@ -2152,7 +2152,7 @@ do_autovacuum(void)
 		/*
 		 * We cannot safely process other backends' temp tables, so skip 'em.
 		 */
-		if (classForm->relpersistence == RELPERSISTENCE_TEMP)
+		if (IsLocalRelpersistence(classForm->relpersistence))
 			continue;
 
 		relid = classForm->oid;
diff --git a/src/backend/storage/buffer/bufmgr.c b/src/backend/storage/buffer/bufmgr.c
index aba3960481..6322984c45 100644
--- a/src/backend/storage/buffer/bufmgr.c
+++ b/src/backend/storage/buffer/bufmgr.c
@@ -429,7 +429,7 @@ ForgetPrivateRefCountEntry(PrivateRefCountEntry *ref)
 )
 
 
-static Buffer ReadBuffer_common(SMgrRelation reln, char relpersistence,
+static Buffer ReadBuffer_common(SMgrRelation reln, char relpersistence, char relkind,
 								ForkNumber forkNum, BlockNumber blockNum,
 								ReadBufferMode mode, BufferAccessStrategy strategy,
 								bool *hit);
@@ -663,7 +663,7 @@ ReadBufferExtended(Relation reln, ForkNumber forkNum, BlockNumber blockNum,
 	 * miss.
 	 */
 	pgstat_count_buffer_read(reln);
-	buf = ReadBuffer_common(reln->rd_smgr, reln->rd_rel->relpersistence,
+	buf = ReadBuffer_common(reln->rd_smgr, reln->rd_rel->relpersistence, reln->rd_rel->relkind,
 							forkNum, blockNum, mode, strategy, &hit);
 	if (hit)
 		pgstat_count_buffer_hit(reln);
@@ -691,7 +691,7 @@ ReadBufferWithoutRelcache(RelFileNode rnode, ForkNumber forkNum,
 
 	Assert(InRecovery);
 
-	return ReadBuffer_common(smgr, RELPERSISTENCE_PERMANENT, forkNum, blockNum,
+	return ReadBuffer_common(smgr, RELPERSISTENCE_PERMANENT, RELKIND_RELATION, forkNum, blockNum,
 							 mode, strategy, &hit);
 }
 
@@ -702,7 +702,7 @@ ReadBufferWithoutRelcache(RelFileNode rnode, ForkNumber forkNum,
  * *hit is set to true if the request was satisfied from shared buffer cache.
  */
 static Buffer
-ReadBuffer_common(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
+ReadBuffer_common(SMgrRelation smgr, char relpersistence, char relkind, ForkNumber forkNum,
 				  BlockNumber blockNum, ReadBufferMode mode,
 				  BufferAccessStrategy strategy, bool *hit)
 {
@@ -895,7 +895,8 @@ ReadBuffer_common(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
 			if (track_io_timing)
 				INSTR_TIME_SET_CURRENT(io_start);
 
-			smgrread(smgr, forkNum, blockNum, (char *) bufBlock);
+			smgrread(smgr, forkNum, blockNum, (char *) bufBlock,
+					 relkind == RELKIND_INDEX);
 
 			if (track_io_timing)
 			{
@@ -2943,7 +2944,7 @@ DropRelFileNodeBuffers(RelFileNodeBackend rnode, ForkNumber *forkNum,
 	/* If it's a local relation, it's localbuf.c's problem. */
 	if (RelFileNodeBackendIsTemp(rnode))
 	{
-		if (rnode.backend == MyBackendId)
+		if (GetRelationBackendId(rnode.backend) == MyBackendId)
 		{
 			for (j = 0; j < nforks; j++)
 				DropRelFileNodeLocalBuffers(rnode.node, forkNum[j],
diff --git a/src/backend/storage/smgr/md.c b/src/backend/storage/smgr/md.c
index c5b771c531..4400b211f8 100644
--- a/src/backend/storage/smgr/md.c
+++ b/src/backend/storage/smgr/md.c
@@ -27,12 +27,14 @@
 
 #include "access/xlog.h"
 #include "access/xlogutils.h"
+#include "commands/tablecmds.h"
 #include "commands/tablespace.h"
 #include "miscadmin.h"
 #include "pg_trace.h"
 #include "pgstat.h"
 #include "postmaster/bgwriter.h"
 #include "storage/bufmgr.h"
+#include "storage/ipc.h"
 #include "storage/fd.h"
 #include "storage/md.h"
 #include "storage/relfilenode.h"
@@ -40,6 +42,7 @@
 #include "storage/sync.h"
 #include "utils/hsearch.h"
 #include "utils/memutils.h"
+#include "utils/rel.h"
 
 /*
  *	The magnetic disk storage manager keeps track of open file
@@ -87,6 +90,19 @@ typedef struct _MdfdVec
 
 static MemoryContext MdCxt;		/* context for all MdfdVec objects */
 
+/*
+ * Structure used to collect information created by this backend.
+ * Data of this related should be deleted on backend exit.
+ */
+typedef struct SessionRelation
+{
+	RelFileNodeBackend rnode;
+	ForkNumber forknum;
+	struct SessionRelation* next;
+} SessionRelation;
+
+
+static SessionRelation* SessionRelations;
 
 /* Populate a file tag describing an md.c segment file. */
 #define INIT_MD_FILETAG(a,xx_rnode,xx_forknum,xx_segno) \
@@ -152,6 +168,60 @@ mdinit(void)
 								  ALLOCSET_DEFAULT_SIZES);
 }
 
+
+/*
+ * Delete all data of session relations and remove their pages from shared buffers.
+ * This function is called on backend exit.
+ */
+static void
+TruncateSessionRelations(int code, Datum arg)
+{
+	SessionRelation* rel;
+	for (rel = SessionRelations; rel != NULL; rel = rel->next)
+	{
+		/* Delete relation files */
+		mdunlink(rel->rnode, rel->forknum, false);
+	}
+}
+
+/*
+ * Maintain information about session relations accessed by this backend.
+ * This list is needed to perform cleanup on backend exit.
+ * Session relation is linked in this list when this relation is created or opened and file doesn't exist.
+ * Such procedure guarantee that each relation is linked into list only once.
+ */
+static void
+RegisterSessionRelation(SMgrRelation reln, ForkNumber forknum)
+{
+	SessionRelation* rel = (SessionRelation*)MemoryContextAlloc(TopMemoryContext, sizeof(SessionRelation));
+
+	/*
+	 * Perform session relation cleanup on backend exit. We are using shared memory hook, because
+	 * cleanup should be performed before backend is disconnected from shared memory.
+	 */
+	if (SessionRelations == NULL)
+		on_shmem_exit(TruncateSessionRelations, 0);
+
+	rel->rnode = reln->smgr_rnode;
+	rel->forknum = forknum;
+	rel->next = SessionRelations;
+	SessionRelations = rel;
+}
+
+static void
+RegisterOnCommitAction(SMgrRelation reln, ForkNumber forknum)
+{
+	if (reln->smgr_owner && forknum == MAIN_FORKNUM)
+	{
+		Relation rel = (Relation)((char*)reln->smgr_owner - offsetof(RelationData, rd_smgr));
+		if (rel->rd_options
+			&& ((StdRdOptions *)rel->rd_options)->on_commit_delete_rows)
+		{
+			register_on_commit_action(rel->rd_id, ONCOMMIT_DELETE_ROWS);
+		}
+	}
+}
+
 /*
  *	mdexists() -- Does the physical file exist?
  *
@@ -218,6 +288,8 @@ mdcreate(SMgrRelation reln, ForkNumber forkNum, bool isRedo)
 					 errmsg("could not create file \"%s\": %m", path)));
 		}
 	}
+	if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		RegisterSessionRelation(reln, forkNum);
 
 	pfree(path);
 
@@ -465,6 +537,21 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 
 	if (fd < 0)
 	{
+		/*
+		 * In case of session relation access, there may be no yet files of this relation for this backend.
+		 * If so, then create file and register session relation for truncation on backend exit.
+		 */
+		if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
+			fd = PathNameOpenFile(path, O_RDWR | PG_BINARY | O_CREAT);
+			if (fd >= 0)
+			{
+				RegisterSessionRelation(reln, forknum);
+				if (!(behavior & EXTENSION_RETURN_NULL))
+					RegisterOnCommitAction(reln, forknum);
+				goto NewSegment;
+			}
+		}
 		if ((behavior & EXTENSION_RETURN_NULL) &&
 			FILE_POSSIBLY_DELETED(errno))
 		{
@@ -476,6 +563,7 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 				 errmsg("could not open file \"%s\": %m", path)));
 	}
 
+  NewSegment:
 	pfree(path);
 
 	_fdvec_resize(reln, forknum, 1);
@@ -599,7 +687,7 @@ mdwriteback(SMgrRelation reln, ForkNumber forknum,
  */
 void
 mdread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
-	   char *buffer)
+	   char *buffer, bool skipInit)
 {
 	off_t		seekpos;
 	int			nbytes;
@@ -644,8 +732,13 @@ mdread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
 		 * complaining.  This allows, for example, the case of trying to
 		 * update a block that was later truncated away.
 		 */
-		if (zero_damaged_pages || InRecovery)
+		if (zero_damaged_pages || InRecovery || RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
 			MemSet(buffer, 0, BLCKSZ);
+			/* In case of session relation we need to write zero page to provide correct result of subsequent mdnblocks */
+			if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode) && !skipInit)
+				mdwrite(reln, forknum, blocknum, buffer, true);
+		}
 		else
 			ereport(ERROR,
 					(errcode(ERRCODE_DATA_CORRUPTED),
@@ -735,7 +828,8 @@ mdnblocks(SMgrRelation reln, ForkNumber forknum)
 	BlockNumber segno = 0;
 
 	/* mdopen has opened the first segment */
-	Assert(reln->md_num_open_segs[forknum] > 0);
+	if (reln->md_num_open_segs[forknum] == 0)
+		return 0;
 
 	/*
 	 * Start from the last open segments, to avoid redundant seeks.  We have
diff --git a/src/backend/storage/smgr/smgr.c b/src/backend/storage/smgr/smgr.c
index 360b5bf5bf..a7b491b8d5 100644
--- a/src/backend/storage/smgr/smgr.c
+++ b/src/backend/storage/smgr/smgr.c
@@ -52,7 +52,7 @@ typedef struct f_smgr
 	void		(*smgr_prefetch) (SMgrRelation reln, ForkNumber forknum,
 								  BlockNumber blocknum);
 	void		(*smgr_read) (SMgrRelation reln, ForkNumber forknum,
-							  BlockNumber blocknum, char *buffer);
+							  BlockNumber blocknum, char *buffer, bool skipInit);
 	void		(*smgr_write) (SMgrRelation reln, ForkNumber forknum,
 							   BlockNumber blocknum, char *buffer, bool skipFsync);
 	void		(*smgr_writeback) (SMgrRelation reln, ForkNumber forknum,
@@ -506,9 +506,9 @@ smgrprefetch(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum)
  */
 void
 smgrread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
-		 char *buffer)
+		 char *buffer, bool skipInit)
 {
-	smgrsw[reln->smgr_which].smgr_read(reln, forknum, blocknum, buffer);
+	smgrsw[reln->smgr_which].smgr_read(reln, forknum, blocknum, buffer, skipInit);
 }
 
 /*
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 840664429e..0416549679 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -994,6 +994,9 @@ pg_relation_filepath(PG_FUNCTION_ARGS)
 	/* Determine owning backend. */
 	switch (relform->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/utils/cache/catcache.c b/src/backend/utils/cache/catcache.c
index 64776e3209..4996d8855c 100644
--- a/src/backend/utils/cache/catcache.c
+++ b/src/backend/utils/cache/catcache.c
@@ -1191,6 +1191,110 @@ SearchCatCache4(CatCache *cache,
 	return SearchCatCacheInternal(cache, 4, v1, v2, v3, v4);
 }
 
+
+void InsertCatCache(CatCache *cache,
+					Datum v1, Datum v2, Datum v3, Datum v4,
+					HeapTuple tuple)
+{
+	Datum		arguments[CATCACHE_MAXKEYS];
+	uint32		hashValue;
+	Index		hashIndex;
+	CatCTup    *ct;
+	dlist_iter	iter;
+	dlist_head *bucket;
+	int         nkeys = cache->cc_nkeys;
+	MemoryContext oldcxt;
+
+	/*
+	 * one-time startup overhead for each cache
+	 */
+	if (unlikely(cache->cc_tupdesc == NULL))
+		CatalogCacheInitializeCache(cache);
+
+	/* Initialize local parameter array */
+	arguments[0] = v1;
+	arguments[1] = v2;
+	arguments[2] = v3;
+	arguments[3] = v4;
+	/*
+	 * find the hash bucket in which to look for the tuple
+	 */
+	hashValue = CatalogCacheComputeHashValue(cache, nkeys, v1, v2, v3, v4);
+	hashIndex = HASH_INDEX(hashValue, cache->cc_nbuckets);
+
+	/*
+	 * scan the hash bucket until we find a match or exhaust our tuples
+	 *
+	 * Note: it's okay to use dlist_foreach here, even though we modify the
+	 * dlist within the loop, because we don't continue the loop afterwards.
+	 */
+	bucket = &cache->cc_bucket[hashIndex];
+	dlist_foreach(iter, bucket)
+	{
+		ct = dlist_container(CatCTup, cache_elem, iter.cur);
+
+		if (ct->dead)
+			continue;			/* ignore dead entries */
+
+		if (ct->hash_value != hashValue)
+			continue;			/* quickly skip entry if wrong hash val */
+
+		if (!CatalogCacheCompareTuple(cache, nkeys, ct->keys, arguments))
+			continue;
+
+		/*
+		 * If it's a positive entry, bump its refcount and return it. If it's
+		 * negative, we can report failure to the caller.
+		 */
+		if (ct->tuple.t_len == tuple->t_len)
+		{
+			memcpy((char *) ct->tuple.t_data,
+				   (const char *) tuple->t_data,
+				   tuple->t_len);
+			return;
+		}
+		dlist_delete(&ct->cache_elem);
+		pfree(ct);
+		cache->cc_ntup -= 1;
+		CacheHdr->ch_ntup -= 1;
+		break;
+	}
+	/* Allocate memory for CatCTup and the cached tuple in one go */
+	oldcxt = MemoryContextSwitchTo(CacheMemoryContext);
+
+	ct = (CatCTup *) palloc(sizeof(CatCTup) +
+							MAXIMUM_ALIGNOF + tuple->t_len);
+	ct->tuple.t_len = tuple->t_len;
+	ct->tuple.t_self = tuple->t_self;
+	ct->tuple.t_tableOid = tuple->t_tableOid;
+	ct->tuple.t_data = (HeapTupleHeader)
+		MAXALIGN(((char *) ct) + sizeof(CatCTup));
+	/* copy tuple contents */
+	memcpy((char *) ct->tuple.t_data,
+		   (const char *) tuple->t_data,
+		   tuple->t_len);
+	ct->ct_magic = CT_MAGIC;
+	ct->my_cache = cache;
+	ct->c_list = NULL;
+	ct->refcount = 1;			/* pinned*/
+	ct->dead = false;
+	ct->negative = false;
+	ct->hash_value = hashValue;
+	dlist_push_head(&cache->cc_bucket[hashIndex], &ct->cache_elem);
+	memcpy(ct->keys, arguments, nkeys*sizeof(Datum));
+
+	cache->cc_ntup++;
+	CacheHdr->ch_ntup++;
+	MemoryContextSwitchTo(oldcxt);
+
+	/*
+	 * If the hash table has become too full, enlarge the buckets array. Quite
+	 * arbitrarily, we enlarge when fill factor > 2.
+	 */
+	if (cache->cc_ntup > cache->cc_nbuckets * 2)
+		RehashCatCache(cache);
+}
+
 /*
  * Work-horse for SearchCatCache/SearchCatCacheN.
  */
diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c
index df025a5a30..dd0b1ff32f 100644
--- a/src/backend/utils/cache/relcache.c
+++ b/src/backend/utils/cache/relcache.c
@@ -1092,6 +1092,10 @@ RelationBuildDesc(Oid targetRelId, bool insertIt)
 	relation->rd_newRelfilenodeSubid = InvalidSubTransactionId;
 	switch (relation->rd_rel->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			relation->rd_backend = BackendIdForSessionRelations();
+			relation->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			relation->rd_backend = InvalidBackendId;
@@ -3303,6 +3307,10 @@ RelationBuildLocalRelation(const char *relname,
 	rel->rd_rel->relpersistence = relpersistence;
 	switch (relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			rel->rd_backend = BackendIdForSessionRelations();
+			rel->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			rel->rd_backend = InvalidBackendId;
diff --git a/src/backend/utils/cache/syscache.c b/src/backend/utils/cache/syscache.c
index 53d9ddf159..f263b8318c 100644
--- a/src/backend/utils/cache/syscache.c
+++ b/src/backend/utils/cache/syscache.c
@@ -1156,6 +1156,16 @@ SearchSysCache4(int cacheId,
 	return SearchCatCache4(SysCache[cacheId], key1, key2, key3, key4);
 }
 
+void
+InsertSysCache(int cacheId,
+			   Datum key1, Datum key2, Datum key3, Datum key4,
+			   HeapTuple value)
+{
+	Assert(cacheId >= 0 && cacheId < SysCacheSize &&
+		   PointerIsValid(SysCache[cacheId]));
+	InsertCatCache(SysCache[cacheId], key1, key2, key3, key4, value);
+}
+
 /*
  * ReleaseSysCache
  *		Release previously grabbed reference count on a tuple
diff --git a/src/backend/utils/fmgr/funcapi.c b/src/backend/utils/fmgr/funcapi.c
index b7eee3da1d..afe22b2b9f 100644
--- a/src/backend/utils/fmgr/funcapi.c
+++ b/src/backend/utils/fmgr/funcapi.c
@@ -18,6 +18,7 @@
 #include "catalog/namespace.h"
 #include "catalog/pg_proc.h"
 #include "catalog/pg_type.h"
+#include "catalog/pg_statistic_d.h"
 #include "funcapi.h"
 #include "nodes/nodeFuncs.h"
 #include "parser/parse_coerce.h"
@@ -30,6 +31,13 @@
 #include "utils/syscache.h"
 #include "utils/typcache.h"
 
+/*
+ * TODO: find less ugly way to declare core function returning pg_statistics.
+ * OID of pg_gtt_statistic_for_relation. This function should be handled in special way because it returns set of pg_statistics
+ * which contains attributes of anyarray type. Type of attributes can not be deduced from input parameters and
+ * it prevents using tuple descriptor in this case.
+ */
+#define GttStatisticFunctionId 3434
 
 static void shutdown_MultiFuncCall(Datum arg);
 static TypeFuncClass internal_get_result_type(Oid funcid,
@@ -341,7 +349,8 @@ internal_get_result_type(Oid funcid,
 
 		if (resolve_polymorphic_tupdesc(tupdesc,
 										&procform->proargtypes,
-										call_expr))
+										call_expr) ||
+			funcid == GttStatisticFunctionId)
 		{
 			if (tupdesc->tdtypeid == RECORDOID &&
 				tupdesc->tdtypmod < 0)
diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
index ec3e2c63b0..4c15822d5c 100644
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -15635,8 +15635,8 @@ dumpTableSchema(Archive *fout, TableInfo *tbinfo)
 											 tbinfo->dobj.catId.oid, false);
 
 		appendPQExpBuffer(q, "CREATE %s%s %s",
-						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ?
-						  "UNLOGGED " : "",
+						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ? "UNLOGGED "
+						  : tbinfo->relpersistence == RELPERSISTENCE_SESSION ? "SESSION " : "",
 						  reltypename,
 						  qualrelname);
 
diff --git a/src/common/relpath.c b/src/common/relpath.c
index ad733d1363..be38d1728b 100644
--- a/src/common/relpath.c
+++ b/src/common/relpath.c
@@ -169,7 +169,18 @@ GetRelationPath(Oid dbNode, Oid spcNode, Oid relNode,
 		}
 		else
 		{
-			if (forkNumber != MAIN_FORKNUM)
+			/*
+			 * Session relations are distinguished from local temp relations by adding
+			 * SessionRelFirstBackendId offset to backendId.
+			 * These is no need to separate them at file system level, so just subtract SessionRelFirstBackendId
+			 * to avoid too long file names.
+			 * Segments of session relations have the same prefix (t%d_) as local temporary relations
+			 * to make it possible to cleanup them in the same way as local temporary relation files.
+			 */
+			 if (backendId >= SessionRelFirstBackendId)
+				 backendId -= SessionRelFirstBackendId;
+
+			 if (forkNumber != MAIN_FORKNUM)
 				path = psprintf("base/%u/t%d_%u_%s",
 								dbNode, backendId, relNode,
 								forkNames[forkNumber]);
diff --git a/src/include/catalog/pg_class.h b/src/include/catalog/pg_class.h
index a12fc1fc46..89c3645c39 100644
--- a/src/include/catalog/pg_class.h
+++ b/src/include/catalog/pg_class.h
@@ -165,6 +165,7 @@ typedef FormData_pg_class *Form_pg_class;
 #define		  RELPERSISTENCE_PERMANENT	'p' /* regular table */
 #define		  RELPERSISTENCE_UNLOGGED	'u' /* unlogged permanent table */
 #define		  RELPERSISTENCE_TEMP		't' /* temporary table */
+#define		  RELPERSISTENCE_SESSION	's' /* session table */
 
 /* default selection for replica identity (primary key or nothing) */
 #define		  REPLICA_IDENTITY_DEFAULT	'd'
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 2228256907..6757491d35 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -5503,7 +5503,14 @@
   proname => 'pg_stat_get_xact_function_self_time', provolatile => 'v',
   proparallel => 'r', prorettype => 'float8', proargtypes => 'oid',
   prosrc => 'pg_stat_get_xact_function_self_time' },
-
+{ oid => '3434',
+  descr => 'show local statistics for global temp table',
+  proname => 'pg_gtt_statistic_for_relation', provolatile => 'v', proparallel => 'u',
+  prorettype => 'record', proretset => 't', prorows => '100', proargtypes => 'oid',
+  proallargtypes => '{oid,oid,int2,bool,float4,int4,float4,int2,int2,int2,int2,int2,oid,oid,oid,oid,oid,oid,oid,oid,oid,oid,_float4,_float4,_float4,_float4,_float4,anyarray,anyarray,anyarray,anyarray,anyarray}',
+  proargmodes => '{i,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o}',
+  proargnames => '{relid,starelid,staattnum,stainherit,stanullfrac,stawidth,stadistinct,stakind1,stakind2,stakind3,stakind4,stakind5,staop1,staop2,staop3,staop4,staop5,stacoll1,stacoll2,stacoll3,stacoll4,stacoll5,stanumbers1,stanumbers2,stanumbers3,stanumbers4,stanumbers5,stavalues1,stavalues2,stavalues3,stavalues4,stavalues5}',
+  prosrc => 'pg_gtt_statistic_for_relation' },
 { oid => '3788',
   descr => 'statistics: timestamp of the current statistics snapshot',
   proname => 'pg_stat_get_snapshot_timestamp', provolatile => 's',
diff --git a/src/include/storage/backendid.h b/src/include/storage/backendid.h
index 0c776a3e6c..124fc3c8fb 100644
--- a/src/include/storage/backendid.h
+++ b/src/include/storage/backendid.h
@@ -22,6 +22,13 @@ typedef int BackendId;			/* unique currently active backend identifier */
 
 #define InvalidBackendId		(-1)
 
+/*
+ * We need to distinguish local and global temporary relations by RelFileNodeBackend.
+ * The least invasive change is to add some special bias value to backend id (since 
+ * maximal number of backed is limited by MaxBackends).
+ */
+#define SessionRelFirstBackendId (0x40000000)
+
 extern PGDLLIMPORT BackendId MyBackendId;	/* backend id of this backend */
 
 /* backend id of our parallel session leader, or InvalidBackendId if none */
@@ -34,4 +41,12 @@ extern PGDLLIMPORT BackendId ParallelMasterBackendId;
 #define BackendIdForTempRelations() \
 	(ParallelMasterBackendId == InvalidBackendId ? MyBackendId : ParallelMasterBackendId)
 
+
+#define BackendIdForSessionRelations() \
+	(BackendIdForTempRelations() + SessionRelFirstBackendId)
+
+#define IsSessionRelationBackendId(id) ((id) >= SessionRelFirstBackendId)
+
+#define GetRelationBackendId(id) ((id) & ~SessionRelFirstBackendId)
+
 #endif							/* BACKENDID_H */
diff --git a/src/include/storage/bufpage.h b/src/include/storage/bufpage.h
index 3f88683a05..7ecef10e41 100644
--- a/src/include/storage/bufpage.h
+++ b/src/include/storage/bufpage.h
@@ -228,6 +228,13 @@ typedef PageHeaderData *PageHeader;
  */
 #define PageIsNew(page) (((PageHeader) (page))->pd_upper == 0)
 
+/*
+ * Page of temporary relation is not initialized
+ */
+#define GlobalTempRelationPageIsNotInitialized(rel, page) \
+	((rel)->rd_rel->relpersistence == RELPERSISTENCE_SESSION && PageIsNew(page))
+
+
 /*
  * PageGetItemId
  *		Returns an item identifier of a page.
diff --git a/src/include/storage/md.h b/src/include/storage/md.h
index ec7630ce3b..56838831b7 100644
--- a/src/include/storage/md.h
+++ b/src/include/storage/md.h
@@ -31,7 +31,7 @@ extern void mdextend(SMgrRelation reln, ForkNumber forknum,
 extern void mdprefetch(SMgrRelation reln, ForkNumber forknum,
 					   BlockNumber blocknum);
 extern void mdread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
-				   char *buffer);
+				   char *buffer, bool skipInit);
 extern void mdwrite(SMgrRelation reln, ForkNumber forknum,
 					BlockNumber blocknum, char *buffer, bool skipFsync);
 extern void mdwriteback(SMgrRelation reln, ForkNumber forknum,
diff --git a/src/include/storage/relfilenode.h b/src/include/storage/relfilenode.h
index 4de9fc1e69..c45040b768 100644
--- a/src/include/storage/relfilenode.h
+++ b/src/include/storage/relfilenode.h
@@ -75,9 +75,24 @@ typedef struct RelFileNodeBackend
 	BackendId	backend;
 } RelFileNodeBackend;
 
+/*
+ * Check whether it is local or global temporary relation, which data belongs only to one backend.
+ */
 #define RelFileNodeBackendIsTemp(rnode) \
 	((rnode).backend != InvalidBackendId)
 
+/*
+ * Check whether it is global temporary relation which metadata is shared by all sessions,
+ * but data is private for the current session.
+ */
+#define RelFileNodeBackendIsGlobalTemp(rnode) IsSessionRelationBackendId((rnode).backend)
+
+/*
+ * Check whether it is local temporary relation which exists only in this backend.
+ */
+#define RelFileNodeBackendIsLocalTemp(rnode) \
+	(RelFileNodeBackendIsTemp(rnode) && !RelFileNodeBackendIsGlobalTemp(rnode))
+
 /*
  * Note: RelFileNodeEquals and RelFileNodeBackendEquals compare relNode first
  * since that is most likely to be different in two unequal RelFileNodes.  It
diff --git a/src/include/storage/smgr.h b/src/include/storage/smgr.h
index 243822137c..a4a2da2e0b 100644
--- a/src/include/storage/smgr.h
+++ b/src/include/storage/smgr.h
@@ -95,7 +95,7 @@ extern void smgrextend(SMgrRelation reln, ForkNumber forknum,
 extern void smgrprefetch(SMgrRelation reln, ForkNumber forknum,
 						 BlockNumber blocknum);
 extern void smgrread(SMgrRelation reln, ForkNumber forknum,
-					 BlockNumber blocknum, char *buffer);
+					 BlockNumber blocknum, char *buffer, bool skipInit);
 extern void smgrwrite(SMgrRelation reln, ForkNumber forknum,
 					  BlockNumber blocknum, char *buffer, bool skipFsync);
 extern void smgrwriteback(SMgrRelation reln, ForkNumber forknum,
diff --git a/src/include/utils/catcache.h b/src/include/utils/catcache.h
index f4aa316604..365b02a9ba 100644
--- a/src/include/utils/catcache.h
+++ b/src/include/utils/catcache.h
@@ -228,4 +228,8 @@ extern void PrepareToInvalidateCacheTuple(Relation relation,
 extern void PrintCatCacheLeakWarning(HeapTuple tuple);
 extern void PrintCatCacheListLeakWarning(CatCList *list);
 
+extern void InsertCatCache(CatCache *cache,
+						   Datum v1, Datum v2, Datum v3, Datum v4,
+						   HeapTuple tuple);
+
 #endif							/* CATCACHE_H */
diff --git a/src/include/utils/rel.h b/src/include/utils/rel.h
index 44ed04dd3f..ae56427cba 100644
--- a/src/include/utils/rel.h
+++ b/src/include/utils/rel.h
@@ -277,6 +277,7 @@ typedef struct StdRdOptions
 	int			parallel_workers;	/* max number of parallel workers */
 	bool		vacuum_index_cleanup;	/* enables index vacuuming and cleanup */
 	bool		vacuum_truncate;	/* enables vacuum to truncate a relation */
+	bool		on_commit_delete_rows;	/* global temp table */
 } StdRdOptions;
 
 #define HEAP_MIN_FILLFACTOR			10
@@ -332,6 +333,18 @@ typedef struct StdRdOptions
 	((relation)->rd_options ? \
 	 ((StdRdOptions *) (relation)->rd_options)->parallel_workers : (defaultpw))
 
+/*
+ * Relation persistence is either TEMP either SESSION
+ */
+#define IsLocalRelpersistence(relpersistence) \
+	((relpersistence) == RELPERSISTENCE_TEMP || (relpersistence) == RELPERSISTENCE_SESSION)
+
+/*
+ * Relation is either global either local temp table
+ */
+#define RelationHasSessionScope(relation) \
+	IsLocalRelpersistence(((relation)->rd_rel->relpersistence))
+
 /* ViewOptions->check_option values */
 typedef enum ViewOptCheckOption
 {
@@ -340,6 +353,7 @@ typedef enum ViewOptCheckOption
 	VIEW_OPTION_CHECK_OPTION_CASCADED
 } ViewOptCheckOption;
 
+
 /*
  * ViewOptions
  *		Contents of rd_options for views
@@ -535,7 +549,7 @@ typedef struct ViewOptions
  *		True if relation's pages are stored in local buffers.
  */
 #define RelationUsesLocalBuffers(relation) \
-	((relation)->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
+	RelationHasSessionScope(relation)
 
 /*
  * RELATION_IS_LOCAL
diff --git a/src/include/utils/syscache.h b/src/include/utils/syscache.h
index f27b73d76d..eaf21d987d 100644
--- a/src/include/utils/syscache.h
+++ b/src/include/utils/syscache.h
@@ -216,4 +216,8 @@ extern bool RelationSupportsSysCache(Oid relid);
 
 #define ReleaseSysCacheList(x)	ReleaseCatCacheList(x)
 
+
+extern void InsertSysCache(int cacheId, 
+						   Datum v1, Datum v2, Datum v3, Datum v4,
+						   HeapTuple tuple);
 #endif							/* SYSCACHE_H */
diff --git a/src/test/isolation/expected/inherit-global-temp.out b/src/test/isolation/expected/inherit-global-temp.out
new file mode 100644
index 0000000000..6114f8c091
--- /dev/null
+++ b/src/test/isolation/expected/inherit-global-temp.out
@@ -0,0 +1,218 @@
+Parsed test spec with 2 sessions
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_update_p s1_update_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_update_p: UPDATE inh_global_parent SET a = 11 WHERE a = 1;
+step s1_update_c: UPDATE inh_global_parent SET a = 13 WHERE a IN (3, 5);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+2              
+11             
+4              
+13             
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+4              
+13             
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+2              
+11             
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_update_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_update_c: UPDATE inh_global_parent SET a = 15 WHERE a IN (3, 5);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+6              
+15             
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+6              
+15             
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_delete_p s1_delete_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_delete_p: DELETE FROM inh_global_parent WHERE a = 2;
+step s1_delete_c: DELETE FROM inh_global_parent WHERE a IN (4, 6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+3              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_delete_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_delete_c: DELETE FROM inh_global_parent WHERE a IN (4, 6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+5              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_truncate_p s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_truncate_p s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_truncate_p: TRUNCATE inh_global_parent;
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_begin s1_truncate_p s2_select_p s1_commit
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_begin: BEGIN;
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s2_select_p: SELECT a FROM inh_global_parent; <waiting ...>
+step s1_commit: COMMIT;
+step s2_select_p: <... completed>
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_begin s1_truncate_p s2_select_c s1_commit
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_begin: BEGIN;
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2; <waiting ...>
+step s1_commit: COMMIT;
+step s2_select_c: <... completed>
+a              
+
+5              
+6              
diff --git a/src/test/isolation/isolation_schedule b/src/test/isolation/isolation_schedule
index a2fa19230d..ef7aa85706 100644
--- a/src/test/isolation/isolation_schedule
+++ b/src/test/isolation/isolation_schedule
@@ -88,3 +88,4 @@ test: plpgsql-toast
 test: truncate-conflict
 test: serializable-parallel
 test: serializable-parallel-2
+test: inherit-global-temp
diff --git a/src/test/isolation/specs/inherit-global-temp.spec b/src/test/isolation/specs/inherit-global-temp.spec
new file mode 100644
index 0000000000..5e95dd6f85
--- /dev/null
+++ b/src/test/isolation/specs/inherit-global-temp.spec
@@ -0,0 +1,73 @@
+# This is a copy of the inherit-temp test with little changes for global temporary tables.
+#
+
+setup
+{
+  CREATE TABLE inh_global_parent (a int);
+}
+
+teardown
+{
+  DROP TABLE inh_global_parent;
+}
+
+# Session 1 executes actions which act directly on both the parent and
+# its child.  Abbreviation "c" is used for queries working on the child
+# and "p" on the parent.
+session "s1"
+setup
+{
+  CREATE GLOBAL TEMPORARY TABLE inh_global_temp_child_s1 () INHERITS (inh_global_parent);
+}
+step "s1_begin" { BEGIN; }
+step "s1_truncate_p" { TRUNCATE inh_global_parent; }
+step "s1_select_p" { SELECT a FROM inh_global_parent; }
+step "s1_select_c" { SELECT a FROM inh_global_temp_child_s1; }
+step "s1_insert_p" { INSERT INTO inh_global_parent VALUES (1), (2); }
+step "s1_insert_c" { INSERT INTO inh_global_temp_child_s1 VALUES (3), (4); }
+step "s1_update_p" { UPDATE inh_global_parent SET a = 11 WHERE a = 1; }
+step "s1_update_c" { UPDATE inh_global_parent SET a = 13 WHERE a IN (3, 5); }
+step "s1_delete_p" { DELETE FROM inh_global_parent WHERE a = 2; }
+step "s1_delete_c" { DELETE FROM inh_global_parent WHERE a IN (4, 6); }
+step "s1_commit" { COMMIT; }
+teardown
+{
+  DROP TABLE inh_global_temp_child_s1;
+}
+
+# Session 2 executes actions on the parent which act only on the child.
+session "s2"
+setup
+{
+  CREATE GLOBAL TEMPORARY TABLE inh_global_temp_child_s2 () INHERITS (inh_global_parent);
+}
+step "s2_truncate_p" { TRUNCATE inh_global_parent; }
+step "s2_select_p" { SELECT a FROM inh_global_parent; }
+step "s2_select_c" { SELECT a FROM inh_global_temp_child_s2; }
+step "s2_insert_c" { INSERT INTO inh_global_temp_child_s2 VALUES (5), (6); }
+step "s2_update_c" { UPDATE inh_global_parent SET a = 15 WHERE a IN (3, 5); }
+step "s2_delete_c" { DELETE FROM inh_global_parent WHERE a IN (4, 6); }
+teardown
+{
+  DROP TABLE inh_global_temp_child_s2;
+}
+
+# Check INSERT behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check UPDATE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_update_p" "s1_update_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_update_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check DELETE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_delete_p" "s1_delete_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_delete_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check TRUNCATE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_truncate_p" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_truncate_p" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# TRUNCATE on a parent tree does not block access to temporary child relation
+# of another session, and blocks when scanning the parent.
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_begin" "s1_truncate_p" "s2_select_p" "s1_commit"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_begin" "s1_truncate_p" "s2_select_c" "s1_commit"
diff --git a/src/test/regress/expected/global_temp.out b/src/test/regress/expected/global_temp.out
new file mode 100644
index 0000000000..ae1adb6673
--- /dev/null
+++ b/src/test/regress/expected/global_temp.out
@@ -0,0 +1,247 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+-- Test ON COMMIT DELETE ROWS
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+   2
+(2 rows)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+(1 row)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+ col 
+-----
+   1
+(1 row)
+
+SELECT * FROM global_temptest2;
+ col 
+-----
+(0 rows)
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+ERROR:  unsupported ON COMMIT and foreign key combination
+DETAIL:  Table "global_temptest4" references "global_temptest3", but they do not have the same ON COMMIT setting.
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+ a 
+---
+(0 rows)
+
+DROP TABLE temp_parted_oncommit;
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+              relname              
+-----------------------------------
+ global_temp_parted_oncommit_test
+ global_temp_parted_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_parted_oncommit_test;
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+            relname             
+--------------------------------
+ global_temp_inh_oncommit_test
+ global_temp_inh_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ERROR:  cannot inherit from temporary relation "global_temp_table"
+ROLLBACK;
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM global_temp_table;
+ a 
+---
+ 1
+(1 row)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+(2 rows)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       1
+(1 row)
+
+\c
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+(0 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       2
+(1 row)
+
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       3
+(1 row)
+
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
diff --git a/src/test/regress/expected/rules.out b/src/test/regress/expected/rules.out
index 2ab2115fa1..7538601870 100644
--- a/src/test/regress/expected/rules.out
+++ b/src/test/regress/expected/rules.out
@@ -1349,6 +1349,40 @@ pg_group| SELECT pg_authid.rolname AS groname,
           WHERE (pg_auth_members.roleid = pg_authid.oid)) AS grolist
    FROM pg_authid
   WHERE (NOT pg_authid.rolcanlogin);
+pg_gtt_statistic| SELECT s.starelid,
+    s.staattnum,
+    s.stainherit,
+    s.stanullfrac,
+    s.stawidth,
+    s.stadistinct,
+    s.stakind1,
+    s.stakind2,
+    s.stakind3,
+    s.stakind4,
+    s.stakind5,
+    s.staop1,
+    s.staop2,
+    s.staop3,
+    s.staop4,
+    s.staop5,
+    s.stacoll1,
+    s.stacoll2,
+    s.stacoll3,
+    s.stacoll4,
+    s.stacoll5,
+    s.stanumbers1,
+    s.stanumbers2,
+    s.stanumbers3,
+    s.stanumbers4,
+    s.stanumbers5,
+    s.stavalues1,
+    s.stavalues2,
+    s.stavalues3,
+    s.stavalues4,
+    s.stavalues5
+   FROM pg_class c,
+    LATERAL pg_gtt_statistic_for_relation(c.oid) s(starelid, staattnum, stainherit, stanullfrac, stawidth, stadistinct, stakind1, stakind2, stakind3, stakind4, stakind5, staop1, staop2, staop3, staop4, staop5, stacoll1, stacoll2, stacoll3, stacoll4, stacoll5, stanumbers1, stanumbers2, stanumbers3, stanumbers4, stanumbers5, stavalues1, stavalues2, stavalues3, stavalues4, stavalues5)
+  WHERE (c.relpersistence = 's'::"char");
 pg_hba_file_rules| SELECT a.line_number,
     a.type,
     a.database,
diff --git a/src/test/regress/expected/session_table.out b/src/test/regress/expected/session_table.out
new file mode 100644
index 0000000000..1b9b3f4d20
--- /dev/null
+++ b/src/test/regress/expected/session_table.out
@@ -0,0 +1,64 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+ count 
+-------
+ 10000
+(1 row)
+
+\c
+select count(*) from my_private_table;
+ count 
+-------
+     0
+(1 row)
+
+select * from my_private_table where x=10001;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select * from my_private_table where y=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select count(*) from my_private_table;
+ count  
+--------
+ 100000
+(1 row)
+
+\c
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+   x    |   y    
+--------+--------
+ 100000 | 100000
+(1 row)
+
+drop table  my_private_table;
diff --git a/src/test/regress/parallel_schedule b/src/test/regress/parallel_schedule
index d2b17dd3ea..71c8ca4f20 100644
--- a/src/test/regress/parallel_schedule
+++ b/src/test/regress/parallel_schedule
@@ -107,7 +107,7 @@ test: json jsonb json_encoding jsonpath jsonpath_encoding jsonb_jsonpath
 # NB: temp.sql does a reconnect which transiently uses 2 connections,
 # so keep this parallel group to at most 19 tests
 # ----------
-test: plancache limit plpgsql copy2 temp domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
+test: plancache limit plpgsql copy2 temp global_temp session_table domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
 
 # ----------
 # Another group of parallel tests
diff --git a/src/test/regress/serial_schedule b/src/test/regress/serial_schedule
index acba391332..71abe08e4e 100644
--- a/src/test/regress/serial_schedule
+++ b/src/test/regress/serial_schedule
@@ -172,6 +172,8 @@ test: limit
 test: plpgsql
 test: copy2
 test: temp
+test: global_temp
+test: session_table
 test: domain
 test: rangefuncs
 test: prepare
diff --git a/src/test/regress/sql/global_temp.sql b/src/test/regress/sql/global_temp.sql
new file mode 100644
index 0000000000..3058b9b2c1
--- /dev/null
+++ b/src/test/regress/sql/global_temp.sql
@@ -0,0 +1,151 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+
+-- Test ON COMMIT DELETE ROWS
+
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+SELECT * FROM global_temptest2;
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+DROP TABLE temp_parted_oncommit;
+
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+DROP TABLE global_temp_parted_oncommit_test;
+
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ROLLBACK;
+
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+COMMIT;
+SELECT * FROM global_temp_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+COMMIT;
+SELECT * FROM normal_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+\c
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
diff --git a/src/test/regress/sql/session_table.sql b/src/test/regress/sql/session_table.sql
new file mode 100644
index 0000000000..c6663dc89b
--- /dev/null
+++ b/src/test/regress/sql/session_table.sql
@@ -0,0 +1,18 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+\c
+select count(*) from my_private_table;
+select * from my_private_table where x=10001;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+select * from my_private_table where y=10001;
+select count(*) from my_private_table;
+\c
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+drop table  my_private_table;

diff --git a/contrib/pg_prewarm/pg_prewarm.c b/contrib/pg_prewarm/pg_prewarm.c
index 33e2d28..93059ef 100644
--- a/contrib/pg_prewarm/pg_prewarm.c
+++ b/contrib/pg_prewarm/pg_prewarm.c
@@ -178,7 +178,7 @@ pg_prewarm(PG_FUNCTION_ARGS)
 		for (block = first_block; block <= last_block; ++block)
 		{
 			CHECK_FOR_INTERRUPTS();
-			smgrread(rel->rd_smgr, forkNumber, block, blockbuffer.data);
+			smgrread(rel->rd_smgr, forkNumber, block, blockbuffer.data, false);
 			++blocks_done;
 		}
 	}
diff --git a/src/backend/access/common/reloptions.c b/src/backend/access/common/reloptions.c
index 79430d2..39baddc 100644
--- a/src/backend/access/common/reloptions.c
+++ b/src/backend/access/common/reloptions.c
@@ -158,6 +158,19 @@ static relopt_bool boolRelOpts[] =
 		},
 		true
 	},
+	/*
+	 * For global temp table only
+	 * use AccessExclusiveLock for ensure safety
+	 */
+	{
+		{
+			"on_commit_delete_rows",
+			"global temp table on commit options",
+			RELOPT_KIND_HEAP | RELOPT_KIND_PARTITIONED,
+			ShareUpdateExclusiveLock
+		},
+		false
+	},
 	/* list terminator */
 	{{NULL}}
 };
@@ -1486,6 +1499,8 @@ bytea *
 default_reloptions(Datum reloptions, bool validate, relopt_kind kind)
 {
 	static const relopt_parse_elt tab[] = {
+		{"on_commit_delete_rows", RELOPT_TYPE_BOOL,
+		offsetof(StdRdOptions, on_commit_delete_rows)},
 		{"fillfactor", RELOPT_TYPE_INT, offsetof(StdRdOptions, fillfactor)},
 		{"autovacuum_enabled", RELOPT_TYPE_BOOL,
 		offsetof(StdRdOptions, autovacuum) + offsetof(AutoVacOpts, enabled)},
@@ -1586,13 +1601,17 @@ build_reloptions(Datum reloptions, bool validate,
 bytea *
 partitioned_table_reloptions(Datum reloptions, bool validate)
 {
+	static const relopt_parse_elt tab[] = {
+		{"on_commit_delete_rows", RELOPT_TYPE_BOOL,
+		offsetof(StdRdOptions, on_commit_delete_rows)}
+	};
 	/*
 	 * There are no options for partitioned tables yet, but this is able to do
 	 * some validation.
 	 */
 	return (bytea *) build_reloptions(reloptions, validate,
 									  RELOPT_KIND_PARTITIONED,
-									  0, NULL, 0);
+									  sizeof(StdRdOptions), tab, lengthof(tab));
 }
 
 /*
diff --git a/src/backend/access/heap/heapam_handler.c b/src/backend/access/heap/heapam_handler.c
index 3fa4b76..a86de50 100644
--- a/src/backend/access/heap/heapam_handler.c
+++ b/src/backend/access/heap/heapam_handler.c
@@ -670,6 +670,7 @@ heapam_relation_copy_data(Relation rel, const RelFileNode *newrnode)
 			 * init fork of an unlogged relation.
 			 */
 			if (rel->rd_rel->relpersistence == RELPERSISTENCE_PERMANENT ||
+				rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ||
 				(rel->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED &&
 				 forkNum == INIT_FORKNUM))
 				log_smgrcreate(newrnode, forkNum);
diff --git a/src/backend/catalog/catalog.c b/src/backend/catalog/catalog.c
index 7d6acae..7c48e5c 100644
--- a/src/backend/catalog/catalog.c
+++ b/src/backend/catalog/catalog.c
@@ -396,6 +396,9 @@ GetNewRelFileNode(Oid reltablespace, Relation pg_class, char relpersistence)
 		case RELPERSISTENCE_TEMP:
 			backend = BackendIdForTempRelations();
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 8880586..22ce895 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3707,7 +3707,7 @@ reindex_relation(Oid relid, int flags, int options)
 		if (flags & REINDEX_REL_FORCE_INDEXES_UNLOGGED)
 			persistence = RELPERSISTENCE_UNLOGGED;
 		else if (flags & REINDEX_REL_FORCE_INDEXES_PERMANENT)
-			persistence = RELPERSISTENCE_PERMANENT;
+			persistence = rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ? RELPERSISTENCE_SESSION : RELPERSISTENCE_PERMANENT;
 		else
 			persistence = rel->rd_rel->relpersistence;
 
diff --git a/src/backend/catalog/storage.c b/src/backend/catalog/storage.c
index fddfbf1..9747835 100644
--- a/src/backend/catalog/storage.c
+++ b/src/backend/catalog/storage.c
@@ -92,6 +92,10 @@ RelationCreateStorage(RelFileNode rnode, char relpersistence)
 			backend = InvalidBackendId;
 			needs_wal = false;
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			needs_wal = false;
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
 			needs_wal = true;
@@ -367,7 +371,7 @@ RelationCopyStorage(SMgrRelation src, SMgrRelation dst,
 		/* If we got a cancel signal during the copy of the data, quit */
 		CHECK_FOR_INTERRUPTS();
 
-		smgrread(src, forkNum, blkno, buf.data);
+		smgrread(src, forkNum, blkno, buf.data, false);
 
 		if (!PageIsVerified(page, blkno))
 			ereport(ERROR,
diff --git a/src/backend/catalog/system_views.sql b/src/backend/catalog/system_views.sql
index c9e6060..1f5e52b 100644
--- a/src/backend/catalog/system_views.sql
+++ b/src/backend/catalog/system_views.sql
@@ -1369,7 +1369,15 @@ LANGUAGE INTERNAL
 STRICT STABLE PARALLEL SAFE
 AS 'jsonb_path_query_first_tz';
 
+
+--
+-- Statistic for global temporary tables
 --
+
+CREATE VIEW pg_gtt_statistic AS
+   SELECT s.* from pg_class c,pg_gtt_statistic_for_relation(c.oid) s where c.relpersistence='s';
+
+
 -- The default permissions for functions mean that anyone can execute them.
 -- A number of functions shouldn't be executable by just anyone, but rather
 -- than use explicit 'superuser()' checks in those functions, we use the GRANT
diff --git a/src/backend/commands/analyze.c b/src/backend/commands/analyze.c
index c4420dd..85d8f04 100644
--- a/src/backend/commands/analyze.c
+++ b/src/backend/commands/analyze.c
@@ -40,6 +40,7 @@
 #include "commands/vacuum.h"
 #include "executor/executor.h"
 #include "foreign/fdwapi.h"
+#include "funcapi.h"
 #include "miscadmin.h"
 #include "nodes/nodeFuncs.h"
 #include "parser/parse_oper.h"
@@ -103,7 +104,7 @@ static int	acquire_inherited_sample_rows(Relation onerel, int elevel,
 										  HeapTuple *rows, int targrows,
 										  double *totalrows, double *totaldeadrows);
 static void update_attstats(Oid relid, bool inh,
-							int natts, VacAttrStats **vacattrstats);
+							int natts, VacAttrStats **vacattrstats, bool is_global_temp);
 static Datum std_fetch_func(VacAttrStatsP stats, int rownum, bool *isNull);
 static Datum ind_fetch_func(VacAttrStatsP stats, int rownum, bool *isNull);
 
@@ -323,6 +324,7 @@ do_analyze_rel(Relation onerel, VacuumParams *params,
 	Oid			save_userid;
 	int			save_sec_context;
 	int			save_nestlevel;
+	bool        is_global_temp = onerel->rd_rel->relpersistence == RELPERSISTENCE_SESSION;
 
 	if (inh)
 		ereport(elevel,
@@ -586,14 +588,14 @@ do_analyze_rel(Relation onerel, VacuumParams *params,
 		 * pg_statistic for columns we didn't process, we leave them alone.)
 		 */
 		update_attstats(RelationGetRelid(onerel), inh,
-						attr_cnt, vacattrstats);
+						attr_cnt, vacattrstats, is_global_temp);
 
 		for (ind = 0; ind < nindexes; ind++)
 		{
 			AnlIndexData *thisdata = &indexdata[ind];
 
 			update_attstats(RelationGetRelid(Irel[ind]), false,
-							thisdata->attr_cnt, thisdata->vacattrstats);
+							thisdata->attr_cnt, thisdata->vacattrstats, is_global_temp);
 		}
 
 		/*
@@ -1456,7 +1458,7 @@ acquire_inherited_sample_rows(Relation onerel, int elevel,
  *		by taking a self-exclusive lock on the relation in analyze_rel().
  */
 static void
-update_attstats(Oid relid, bool inh, int natts, VacAttrStats **vacattrstats)
+update_attstats(Oid relid, bool inh, int natts, VacAttrStats **vacattrstats, bool is_global_temp)
 {
 	Relation	sd;
 	int			attno;
@@ -1558,30 +1560,42 @@ update_attstats(Oid relid, bool inh, int natts, VacAttrStats **vacattrstats)
 			}
 		}
 
-		/* Is there already a pg_statistic tuple for this attribute? */
-		oldtup = SearchSysCache3(STATRELATTINH,
-								 ObjectIdGetDatum(relid),
-								 Int16GetDatum(stats->attr->attnum),
-								 BoolGetDatum(inh));
-
-		if (HeapTupleIsValid(oldtup))
+		if (is_global_temp)
 		{
-			/* Yes, replace it */
-			stup = heap_modify_tuple(oldtup,
-									 RelationGetDescr(sd),
-									 values,
-									 nulls,
-									 replaces);
-			ReleaseSysCache(oldtup);
-			CatalogTupleUpdate(sd, &stup->t_self, stup);
+			stup = heap_form_tuple(RelationGetDescr(sd), values, nulls);
+			InsertSysCache(STATRELATTINH,
+						   ObjectIdGetDatum(relid),
+						   Int16GetDatum(stats->attr->attnum),
+						   BoolGetDatum(inh),
+						   0,
+						   stup);
 		}
 		else
 		{
-			/* No, insert new tuple */
-			stup = heap_form_tuple(RelationGetDescr(sd), values, nulls);
-			CatalogTupleInsert(sd, stup);
-		}
+			/* Is there already a pg_statistic tuple for this attribute? */
+			oldtup = SearchSysCache3(STATRELATTINH,
+									 ObjectIdGetDatum(relid),
+									 Int16GetDatum(stats->attr->attnum),
+									 BoolGetDatum(inh));
 
+			if (HeapTupleIsValid(oldtup))
+			{
+				/* Yes, replace it */
+				stup = heap_modify_tuple(oldtup,
+										 RelationGetDescr(sd),
+										 values,
+										 nulls,
+										 replaces);
+				ReleaseSysCache(oldtup);
+				CatalogTupleUpdate(sd, &stup->t_self, stup);
+			}
+			else
+			{
+				/* No, insert new tuple */
+				stup = heap_form_tuple(RelationGetDescr(sd), values, nulls);
+				CatalogTupleInsert(sd, stup);
+			}
+		}
 		heap_freetuple(stup);
 	}
 
@@ -2890,3 +2904,72 @@ analyze_mcv_list(int *mcv_counts,
 	}
 	return num_mcv;
 }
+
+PG_FUNCTION_INFO_V1(pg_gtt_statistic_for_relation);
+
+typedef struct
+{
+	int staattnum;
+	bool stainherit;
+} PgTempStatIteratorCtx;
+
+Datum
+pg_gtt_statistic_for_relation(PG_FUNCTION_ARGS)
+{
+	Oid starelid = PG_GETARG_OID(0);
+	ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
+	Tuplestorestate *tupstore;
+	MemoryContext per_query_ctx;
+	MemoryContext oldcontext;
+	TupleDesc	  tupdesc;
+	bool stainherit = false;
+
+	/* check to see if caller supports us returning a tuplestore */
+	if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
+		elog(ERROR, "return type must be a row type");
+
+	/* check to see if caller supports us returning a tuplestore */
+	if (rsinfo == NULL || !IsA(rsinfo, ReturnSetInfo))
+		ereport(ERROR,
+				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+				 errmsg("set-valued function called in context that cannot accept a set")));
+	if (!(rsinfo->allowedModes & SFRM_Materialize))
+		ereport(ERROR,
+				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+				 errmsg("materialize mode required, but it is not " \
+						"allowed in this context")));
+
+	/* Build tuplestore to hold the result rows */
+	per_query_ctx = rsinfo->econtext->ecxt_per_query_memory;
+	oldcontext = MemoryContextSwitchTo(per_query_ctx);
+
+	/* Build a tuple descriptor for our result type */
+
+	tupstore = tuplestore_begin_heap(true, false, work_mem);
+	rsinfo->returnMode = SFRM_Materialize;
+	rsinfo->setResult = tupstore;
+	rsinfo->setDesc = tupdesc;
+
+	do
+	{
+		int staattnum = 0;
+		while (true)
+		{
+			HeapTuple statup = SearchSysCacheCopy3(STATRELATTINH,
+												   ObjectIdGetDatum(starelid),
+												   Int16GetDatum(++staattnum),
+												   BoolGetDatum(stainherit));
+			if (statup != NULL)
+				tuplestore_puttuple(tupstore, statup);
+			else
+				break;
+		}
+		stainherit = !stainherit;
+	} while (stainherit);
+
+	MemoryContextSwitchTo(oldcontext);
+ 
+	tuplestore_donestoring(tupstore);
+
+	return (Datum) 0;
+}
diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index e9d7a7f..a22a77a 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -391,6 +391,13 @@ cluster_rel(Oid tableOid, Oid indexOid, int options)
 					 errmsg("cannot vacuum temporary tables of other sessions")));
 	}
 
+	/* not support cluster global temp table yet */
+	if (OldHeap->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
+		ereport(ERROR,
+				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+				errmsg("not support cluster global temporary tables yet")));
+
+
 	/*
 	 * Also check for active uses of the relation in the current transaction,
 	 * including open scans and pending AFTER trigger events.
@@ -1399,7 +1406,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap,
 	 */
 	if (newrelpersistence == RELPERSISTENCE_UNLOGGED)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_UNLOGGED;
-	else if (newrelpersistence == RELPERSISTENCE_PERMANENT)
+	else if (newrelpersistence != RELPERSISTENCE_TEMP)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_PERMANENT;
 
 	/* Report that we are now reindexing relations */
diff --git a/src/backend/commands/sequence.c b/src/backend/commands/sequence.c
index 6aab73b..bc3c986 100644
--- a/src/backend/commands/sequence.c
+++ b/src/backend/commands/sequence.c
@@ -94,7 +94,7 @@ static HTAB *seqhashtab = NULL; /* hash table for SeqTable items */
  */
 static SeqTableData *last_used_seq = NULL;
 
-static void fill_seq_with_data(Relation rel, HeapTuple tuple);
+static void fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf);
 static Relation lock_and_open_sequence(SeqTable seq);
 static void create_seq_hashtable(void);
 static void init_sequence(Oid relid, SeqTable *p_elm, Relation *p_rel);
@@ -222,7 +222,7 @@ DefineSequence(ParseState *pstate, CreateSeqStmt *seq)
 
 	/* now initialize the sequence's data */
 	tuple = heap_form_tuple(tupDesc, value, null);
-	fill_seq_with_data(rel, tuple);
+	fill_seq_with_data(rel, tuple, InvalidBuffer);
 
 	/* process OWNED BY if given */
 	if (owned_by)
@@ -327,7 +327,7 @@ ResetSequence(Oid seq_relid)
 	/*
 	 * Insert the modified tuple into the new storage file.
 	 */
-	fill_seq_with_data(seq_rel, tuple);
+	fill_seq_with_data(seq_rel, tuple, InvalidBuffer);
 
 	/* Clear local cache so that we don't think we have cached numbers */
 	/* Note that we do not change the currval() state */
@@ -340,18 +340,21 @@ ResetSequence(Oid seq_relid)
  * Initialize a sequence's relation with the specified tuple as content
  */
 static void
-fill_seq_with_data(Relation rel, HeapTuple tuple)
+fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf)
 {
-	Buffer		buf;
 	Page		page;
 	sequence_magic *sm;
 	OffsetNumber offnum;
+	bool lockBuffer = false;
 
 	/* Initialize first page of relation with special magic number */
 
-	buf = ReadBuffer(rel, P_NEW);
-	Assert(BufferGetBlockNumber(buf) == 0);
-
+	if (buf == InvalidBuffer)
+	{
+		buf = ReadBuffer(rel, P_NEW);
+		Assert(BufferGetBlockNumber(buf) == 0);
+		lockBuffer = true;
+	}
 	page = BufferGetPage(buf);
 
 	PageInit(page, BufferGetPageSize(buf), sizeof(sequence_magic));
@@ -360,7 +363,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	/* Now insert sequence tuple */
 
-	LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
+	if (lockBuffer)
+		LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
 
 	/*
 	 * Since VACUUM does not process sequences, we have to force the tuple to
@@ -410,7 +414,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	END_CRIT_SECTION();
 
-	UnlockReleaseBuffer(buf);
+	if (lockBuffer)
+		UnlockReleaseBuffer(buf);
 }
 
 /*
@@ -502,7 +507,7 @@ AlterSequence(ParseState *pstate, AlterSeqStmt *stmt)
 		/*
 		 * Insert the modified tuple into the new storage file.
 		 */
-		fill_seq_with_data(seqrel, newdatatuple);
+		fill_seq_with_data(seqrel, newdatatuple, InvalidBuffer);
 	}
 
 	/* process OWNED BY if given */
@@ -1178,6 +1183,17 @@ read_seq_tuple(Relation rel, Buffer *buf, HeapTuple seqdatatuple)
 	LockBuffer(*buf, BUFFER_LOCK_EXCLUSIVE);
 
 	page = BufferGetPage(*buf);
+	if (GlobalTempRelationPageIsNotInitialized(rel, page))
+	{
+		/* Initialize sequence for global temporary tables */
+		Datum		value[SEQ_COL_LASTCOL] = {0};
+		bool		null[SEQ_COL_LASTCOL] = {false};
+		HeapTuple tuple;
+		value[SEQ_COL_LASTVAL-1] = Int64GetDatumFast(1); /* start sequence with 1 */
+		tuple = heap_form_tuple(RelationGetDescr(rel), value, null);
+		fill_seq_with_data(rel, tuple, *buf);
+	}
+
 	sm = (sequence_magic *) PageGetSpecialPointer(page);
 
 	if (sm->magic != SEQ_MAGIC)
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index f599393..1e4a52e 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -12,6 +12,9 @@
  *
  *-------------------------------------------------------------------------
  */
+#include <sys/stat.h>
+#include <unistd.h>
+
 #include "postgres.h"
 
 #include "access/attmap.h"
@@ -555,6 +558,23 @@ static List *GetParentedForeignKeyRefs(Relation partition);
 static void ATDetachCheckNoForeignKeyRefs(Relation partition);
 
 
+static bool
+has_oncommit_option(List *options)
+{
+	ListCell   *listptr;
+
+	foreach(listptr, options)
+	{
+		DefElem    *def = (DefElem *) lfirst(listptr);
+
+		if (pg_strcasecmp(def->defname, "on_commit_delete_rows") == 0)
+			return true;
+	}
+
+	return false;
+}
+
+
 /* ----------------------------------------------------------------
  *		DefineRelation
  *				Creates a new relation.
@@ -598,6 +618,7 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 	LOCKMODE	parentLockmode;
 	const char *accessMethod = NULL;
 	Oid			accessMethodId = InvalidOid;
+	bool		has_oncommit_clause = false;
 
 	/*
 	 * Truncate relname to appropriate length (probably a waste of time, as
@@ -609,7 +630,7 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 	 * Check consistency of arguments
 	 */
 	if (stmt->oncommit != ONCOMMIT_NOOP
-		&& stmt->relation->relpersistence != RELPERSISTENCE_TEMP)
+		&& !IsLocalRelpersistence(stmt->relation->relpersistence))
 		ereport(ERROR,
 				(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 				 errmsg("ON COMMIT can only be used on temporary tables")));
@@ -635,17 +656,6 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 		RangeVarGetAndCheckCreationNamespace(stmt->relation, NoLock, NULL);
 
 	/*
-	 * Security check: disallow creating temp tables from security-restricted
-	 * code.  This is needed because calling code might not expect untrusted
-	 * tables to appear in pg_temp at the front of its search path.
-	 */
-	if (stmt->relation->relpersistence == RELPERSISTENCE_TEMP
-		&& InSecurityRestrictedOperation())
-		ereport(ERROR,
-				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
-				 errmsg("cannot create temporary table within security-restricted operation")));
-
-	/*
 	 * Determine the lockmode to use when scanning parents.  A self-exclusive
 	 * lock is needed here.
 	 *
@@ -740,6 +750,38 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 	/*
 	 * Parse and validate reloptions, if any.
 	 */
+	/* global temp table */
+	has_oncommit_clause = has_oncommit_option(stmt->options);
+	if (stmt->relation->relpersistence == RELPERSISTENCE_SESSION)
+	{
+		if (has_oncommit_clause)
+		{
+			if (stmt->oncommit != ONCOMMIT_NOOP)
+				elog(ERROR, "can not defeine global temp table with on commit and with clause at same time");
+		}
+		else if (stmt->oncommit != ONCOMMIT_NOOP)
+		{
+			DefElem *opt = makeNode(DefElem);
+
+			opt->type = T_DefElem;
+			opt->defnamespace = NULL;
+			opt->defname = "on_commit_delete_rows";
+			opt->defaction = DEFELEM_UNSPEC;
+
+			/* use reloptions to remember on commit clause */
+			if (stmt->oncommit == ONCOMMIT_DELETE_ROWS)
+				opt->arg  = (Node *)makeString("true");
+			else if (stmt->oncommit == ONCOMMIT_PRESERVE_ROWS)
+				opt->arg  = (Node *)makeString("false");
+			else
+				elog(ERROR, "global temp table not support on commit drop clause");
+
+			stmt->options = lappend(stmt->options, opt);
+		}
+	}
+	else if (has_oncommit_clause)
+		elog(ERROR, "regular table cannot specifie on_commit_delete_rows");
+
 	reloptions = transformRelOptions((Datum) 0, stmt->options, NULL, validnsps,
 									 true, false);
 
@@ -1824,7 +1866,8 @@ ExecuteTruncateGuts(List *explicit_rels, List *relids, List *relids_logged,
 		 * table or the current physical file to be thrown away anyway.
 		 */
 		if (rel->rd_createSubid == mySubid ||
-			rel->rd_newRelfilenodeSubid == mySubid)
+			rel->rd_newRelfilenodeSubid == mySubid ||
+			rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
 		{
 			/* Immediate, non-rollbackable truncation is OK */
 			heap_truncate_one_rel(rel);
@@ -3511,6 +3554,26 @@ AlterTableLookupRelation(AlterTableStmt *stmt, LOCKMODE lockmode)
 									(void *) stmt);
 }
 
+
+static bool
+CheckGlobalTempTableNotInUse(Relation rel)
+{
+	int id;
+	for (id = 1; id <= MaxBackends; id++)
+	{
+		if (id != MyBackendId)
+		{
+			struct stat fst;
+			char* path = relpathbackend(rel->rd_node, id, MAIN_FORKNUM);
+			int rc = stat(path, &fst);
+			pfree(path);
+			if (rc == 0 && fst.st_size != 0)
+				return false;
+		}
+	}
+	return true;
+}
+
 /*
  * AlterTable
  *		Execute ALTER TABLE, which can be a list of subcommands
@@ -3568,6 +3631,9 @@ AlterTable(AlterTableStmt *stmt, LOCKMODE lockmode,
 	rel = relation_open(context->relid, NoLock);
 
 	CheckTableNotInUse(rel, "ALTER TABLE");
+	if (rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION
+		&& !CheckGlobalTempTableNotInUse(rel))
+		elog(ERROR, "Global temp table used by active backends can not be altered");
 
 	ATController(stmt, rel, stmt->cmds, stmt->relation->inh, lockmode, context);
 }
@@ -8169,6 +8235,12 @@ ATAddForeignKeyConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
 						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 						 errmsg("constraints on unlogged tables may reference only permanent or unlogged tables")));
 			break;
+		case RELPERSISTENCE_SESSION:
+			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
+				ereport(ERROR,
+						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+						 errmsg("constraints on session tables may reference only session tables")));
+			break;
 		case RELPERSISTENCE_TEMP:
 			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_TEMP)
 				ereport(ERROR,
@@ -14629,6 +14701,13 @@ ATPrepChangePersistence(Relation rel, bool toLogged)
 							RelationGetRelationName(rel)),
 					 errtable(rel)));
 			break;
+		case RELPERSISTENCE_SESSION:
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+					 errmsg("cannot change logged status of session table \"%s\"",
+							RelationGetRelationName(rel)),
+					 errtable(rel)));
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			if (toLogged)
 				/* nothing to do */
@@ -15116,14 +15195,7 @@ PreCommit_on_commit_actions(void)
 				/* Do nothing (there shouldn't be such entries, actually) */
 				break;
 			case ONCOMMIT_DELETE_ROWS:
-
-				/*
-				 * If this transaction hasn't accessed any temporary
-				 * relations, we can skip truncating ON COMMIT DELETE ROWS
-				 * tables, as they must still be empty.
-				 */
-				if ((MyXactFlags & XACT_FLAGS_ACCESSEDTEMPNAMESPACE))
-					oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
+				oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
 				break;
 			case ONCOMMIT_DROP:
 				oids_to_drop = lappend_oid(oids_to_drop, oc->relid);
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 59d1a31..0442565 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -354,6 +354,7 @@ ExecInsert(ModifyTableState *mtstate,
 	ModifyTable *node = (ModifyTable *) mtstate->ps.plan;
 	OnConflictAction onconflict = node->onConflictAction;
 
+	if (resultRelInfo->ri_NumIndices > 0)
 	ExecMaterializeSlot(slot);
 
 	/*
@@ -361,7 +362,14 @@ ExecInsert(ModifyTableState *mtstate,
 	 */
 	resultRelInfo = estate->es_result_relation_info;
 	resultRelationDesc = resultRelInfo->ri_RelationDesc;
-
+	if (resultRelationDesc->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
+	{
+		int i;
+		for (i = 0; i < resultRelInfo->ri_NumIndices; i++)
+		{
+			InitGTTIndexes(resultRelInfo->ri_IndexRelationDescs[i]);
+		}
+	}
 	/*
 	 * BEFORE ROW INSERT Triggers.
 	 *
diff --git a/src/backend/optimizer/path/allpaths.c b/src/backend/optimizer/path/allpaths.c
index 8286d9c..7a12635 100644
--- a/src/backend/optimizer/path/allpaths.c
+++ b/src/backend/optimizer/path/allpaths.c
@@ -48,6 +48,7 @@
 #include "partitioning/partprune.h"
 #include "rewrite/rewriteManip.h"
 #include "utils/lsyscache.h"
+#include "utils/rel.h"
 
 
 /* results of subquery_is_pushdown_safe */
@@ -618,7 +619,7 @@ set_rel_consider_parallel(PlannerInfo *root, RelOptInfo *rel,
 			 * the rest of the necessary infrastructure right now anyway.  So
 			 * for now, bail out if we see a temporary table.
 			 */
-			if (get_rel_persistence(rte->relid) == RELPERSISTENCE_TEMP)
+			if (IsLocalRelpersistence(get_rel_persistence(rte->relid)))
 				return;
 
 			/*
diff --git a/src/backend/optimizer/plan/planner.c b/src/backend/optimizer/plan/planner.c
index d6f2153..fd4e713 100644
--- a/src/backend/optimizer/plan/planner.c
+++ b/src/backend/optimizer/plan/planner.c
@@ -6312,7 +6312,7 @@ plan_create_index_workers(Oid tableOid, Oid indexOid)
 	 * Furthermore, any index predicate or index expressions must be parallel
 	 * safe.
 	 */
-	if (heap->rd_rel->relpersistence == RELPERSISTENCE_TEMP ||
+	if (RelationHasSessionScope(heap) ||
 		!is_parallel_safe(root, (Node *) RelationGetIndexExpressions(index)) ||
 		!is_parallel_safe(root, (Node *) RelationGetIndexPredicate(index)))
 	{
diff --git a/src/backend/optimizer/util/plancat.c b/src/backend/optimizer/util/plancat.c
index d82fc5a..619ed96 100644
--- a/src/backend/optimizer/util/plancat.c
+++ b/src/backend/optimizer/util/plancat.c
@@ -80,6 +80,15 @@ static void set_baserel_partition_key_exprs(Relation relation,
 static void set_baserel_partition_constraint(Relation relation,
 											 RelOptInfo *rel);
 
+static bool
+is_index_valid(Relation index)
+{
+	if (!index->rd_index->indisvalid)
+		return false;
+	if (index->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
+		InitGTTIndexes(index);
+	return true;
+}
 
 /*
  * get_relation_info -
@@ -205,7 +214,7 @@ get_relation_info(PlannerInfo *root, Oid relationObjectId, bool inhparent,
 			 * still needs to insert into "invalid" indexes, if they're marked
 			 * indisready.
 			 */
-			if (!index->indisvalid)
+			if (!is_index_valid(indexRelation))
 			{
 				index_close(indexRelation, NoLock);
 				continue;
@@ -704,7 +713,7 @@ infer_arbiter_indexes(PlannerInfo *root)
 		idxRel = index_open(indexoid, rte->rellockmode);
 		idxForm = idxRel->rd_index;
 
-		if (!idxForm->indisvalid)
+		if (!is_index_valid(idxRel))
 			goto next;
 
 		/*
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index 1b0edf5..787de83 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -3288,20 +3288,11 @@ OptTemp:	TEMPORARY					{ $$ = RELPERSISTENCE_TEMP; }
 			| TEMP						{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMPORARY			{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMP				{ $$ = RELPERSISTENCE_TEMP; }
-			| GLOBAL TEMPORARY
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
-			| GLOBAL TEMP
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
+			| GLOBAL TEMPORARY          { $$ = RELPERSISTENCE_SESSION; }
+			| GLOBAL TEMP               { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION                   { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMPORARY         { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMP              { $$ = RELPERSISTENCE_SESSION; }
 			| UNLOGGED					{ $$ = RELPERSISTENCE_UNLOGGED; }
 			| /*EMPTY*/					{ $$ = RELPERSISTENCE_PERMANENT; }
 		;
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index ee2d2b5..e7f3a20 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -438,6 +438,14 @@ generateSerialExtraStmts(CreateStmtContext *cxt, ColumnDef *column,
 	seqstmt->options = seqoptions;
 
 	/*
+	 * Why we should not always use persistence of parent table?
+	 * Although it is prohibited to have unlogged sequences,
+	 * unlogged tables with SERIAL fields are accepted!
+	 */
+	if (cxt->relation->relpersistence != RELPERSISTENCE_UNLOGGED)
+		seqstmt->sequence->relpersistence = cxt->relation->relpersistence;
+
+	/*
 	 * If a sequence data type was specified, add it to the options.  Prepend
 	 * to the list rather than append; in case a user supplied their own AS
 	 * clause, the "redundant options" error will point to their occurrence,
diff --git a/src/backend/postmaster/autovacuum.c b/src/backend/postmaster/autovacuum.c
index 6d1f28c..4074344 100644
--- a/src/backend/postmaster/autovacuum.c
+++ b/src/backend/postmaster/autovacuum.c
@@ -2152,7 +2152,7 @@ do_autovacuum(void)
 		/*
 		 * We cannot safely process other backends' temp tables, so skip 'em.
 		 */
-		if (classForm->relpersistence == RELPERSISTENCE_TEMP)
+		if (IsLocalRelpersistence(classForm->relpersistence))
 			continue;
 
 		relid = classForm->oid;
diff --git a/src/backend/storage/buffer/bufmgr.c b/src/backend/storage/buffer/bufmgr.c
index aba3960..2d88cc9 100644
--- a/src/backend/storage/buffer/bufmgr.c
+++ b/src/backend/storage/buffer/bufmgr.c
@@ -33,9 +33,11 @@
 #include <sys/file.h>
 #include <unistd.h>
 
+#include "access/amapi.h"
 #include "access/tableam.h"
 #include "access/xlog.h"
 #include "catalog/catalog.h"
+#include "catalog/index.h"
 #include "catalog/storage.h"
 #include "executor/instrument.h"
 #include "lib/binaryheap.h"
@@ -429,7 +431,7 @@ ForgetPrivateRefCountEntry(PrivateRefCountEntry *ref)
 )
 
 
-static Buffer ReadBuffer_common(SMgrRelation reln, char relpersistence,
+static Buffer ReadBuffer_common(SMgrRelation reln, char relpersistence, char relkind,
 								ForkNumber forkNum, BlockNumber blockNum,
 								ReadBufferMode mode, BufferAccessStrategy strategy,
 								bool *hit);
@@ -663,7 +665,7 @@ ReadBufferExtended(Relation reln, ForkNumber forkNum, BlockNumber blockNum,
 	 * miss.
 	 */
 	pgstat_count_buffer_read(reln);
-	buf = ReadBuffer_common(reln->rd_smgr, reln->rd_rel->relpersistence,
+	buf = ReadBuffer_common(reln->rd_smgr, reln->rd_rel->relpersistence, reln->rd_rel->relkind,
 							forkNum, blockNum, mode, strategy, &hit);
 	if (hit)
 		pgstat_count_buffer_hit(reln);
@@ -691,7 +693,7 @@ ReadBufferWithoutRelcache(RelFileNode rnode, ForkNumber forkNum,
 
 	Assert(InRecovery);
 
-	return ReadBuffer_common(smgr, RELPERSISTENCE_PERMANENT, forkNum, blockNum,
+	return ReadBuffer_common(smgr, RELPERSISTENCE_PERMANENT, RELKIND_RELATION, forkNum, blockNum,
 							 mode, strategy, &hit);
 }
 
@@ -702,7 +704,7 @@ ReadBufferWithoutRelcache(RelFileNode rnode, ForkNumber forkNum,
  * *hit is set to true if the request was satisfied from shared buffer cache.
  */
 static Buffer
-ReadBuffer_common(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
+ReadBuffer_common(SMgrRelation smgr, char relpersistence, char relkind, ForkNumber forkNum,
 				  BlockNumber blockNum, ReadBufferMode mode,
 				  BufferAccessStrategy strategy, bool *hit)
 {
@@ -895,7 +897,8 @@ ReadBuffer_common(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
 			if (track_io_timing)
 				INSTR_TIME_SET_CURRENT(io_start);
 
-			smgrread(smgr, forkNum, blockNum, (char *) bufBlock);
+			smgrread(smgr, forkNum, blockNum, (char *) bufBlock,
+					 relkind == RELKIND_INDEX);
 
 			if (track_io_timing)
 			{
@@ -2943,7 +2946,7 @@ DropRelFileNodeBuffers(RelFileNodeBackend rnode, ForkNumber *forkNum,
 	/* If it's a local relation, it's localbuf.c's problem. */
 	if (RelFileNodeBackendIsTemp(rnode))
 	{
-		if (rnode.backend == MyBackendId)
+		if (GetRelationBackendId(rnode.backend) == MyBackendId)
 		{
 			for (j = 0; j < nforks; j++)
 				DropRelFileNodeLocalBuffers(rnode.node, forkNum[j],
@@ -4423,3 +4426,19 @@ TestForOldSnapshot_impl(Snapshot snapshot, Relation relation)
 				(errcode(ERRCODE_SNAPSHOT_TOO_OLD),
 				 errmsg("snapshot too old")));
 }
+
+void InitGTTIndexes(Relation index)
+{
+	Buffer metapage = ReadBuffer(index, 0);
+	bool isNew = PageIsNew(BufferGetPage(metapage));
+	Assert(index->rd_rel->relpersistence == RELPERSISTENCE_SESSION);
+	ReleaseBuffer(metapage);
+	if (isNew)
+	{
+		Relation heap;
+		DropRelFileNodeAllLocalBuffers(index->rd_smgr->smgr_rnode.node);
+		heap = RelationIdGetRelation(index->rd_index->indrelid);
+		index->rd_indam->ambuild(heap, index, BuildIndexInfo(index));
+		RelationClose(heap);
+	}
+}
diff --git a/src/backend/storage/smgr/md.c b/src/backend/storage/smgr/md.c
index c5b771c..4400b21 100644
--- a/src/backend/storage/smgr/md.c
+++ b/src/backend/storage/smgr/md.c
@@ -27,12 +27,14 @@
 
 #include "access/xlog.h"
 #include "access/xlogutils.h"
+#include "commands/tablecmds.h"
 #include "commands/tablespace.h"
 #include "miscadmin.h"
 #include "pg_trace.h"
 #include "pgstat.h"
 #include "postmaster/bgwriter.h"
 #include "storage/bufmgr.h"
+#include "storage/ipc.h"
 #include "storage/fd.h"
 #include "storage/md.h"
 #include "storage/relfilenode.h"
@@ -40,6 +42,7 @@
 #include "storage/sync.h"
 #include "utils/hsearch.h"
 #include "utils/memutils.h"
+#include "utils/rel.h"
 
 /*
  *	The magnetic disk storage manager keeps track of open file
@@ -87,6 +90,19 @@ typedef struct _MdfdVec
 
 static MemoryContext MdCxt;		/* context for all MdfdVec objects */
 
+/*
+ * Structure used to collect information created by this backend.
+ * Data of this related should be deleted on backend exit.
+ */
+typedef struct SessionRelation
+{
+	RelFileNodeBackend rnode;
+	ForkNumber forknum;
+	struct SessionRelation* next;
+} SessionRelation;
+
+
+static SessionRelation* SessionRelations;
 
 /* Populate a file tag describing an md.c segment file. */
 #define INIT_MD_FILETAG(a,xx_rnode,xx_forknum,xx_segno) \
@@ -152,6 +168,60 @@ mdinit(void)
 								  ALLOCSET_DEFAULT_SIZES);
 }
 
+
+/*
+ * Delete all data of session relations and remove their pages from shared buffers.
+ * This function is called on backend exit.
+ */
+static void
+TruncateSessionRelations(int code, Datum arg)
+{
+	SessionRelation* rel;
+	for (rel = SessionRelations; rel != NULL; rel = rel->next)
+	{
+		/* Delete relation files */
+		mdunlink(rel->rnode, rel->forknum, false);
+	}
+}
+
+/*
+ * Maintain information about session relations accessed by this backend.
+ * This list is needed to perform cleanup on backend exit.
+ * Session relation is linked in this list when this relation is created or opened and file doesn't exist.
+ * Such procedure guarantee that each relation is linked into list only once.
+ */
+static void
+RegisterSessionRelation(SMgrRelation reln, ForkNumber forknum)
+{
+	SessionRelation* rel = (SessionRelation*)MemoryContextAlloc(TopMemoryContext, sizeof(SessionRelation));
+
+	/*
+	 * Perform session relation cleanup on backend exit. We are using shared memory hook, because
+	 * cleanup should be performed before backend is disconnected from shared memory.
+	 */
+	if (SessionRelations == NULL)
+		on_shmem_exit(TruncateSessionRelations, 0);
+
+	rel->rnode = reln->smgr_rnode;
+	rel->forknum = forknum;
+	rel->next = SessionRelations;
+	SessionRelations = rel;
+}
+
+static void
+RegisterOnCommitAction(SMgrRelation reln, ForkNumber forknum)
+{
+	if (reln->smgr_owner && forknum == MAIN_FORKNUM)
+	{
+		Relation rel = (Relation)((char*)reln->smgr_owner - offsetof(RelationData, rd_smgr));
+		if (rel->rd_options
+			&& ((StdRdOptions *)rel->rd_options)->on_commit_delete_rows)
+		{
+			register_on_commit_action(rel->rd_id, ONCOMMIT_DELETE_ROWS);
+		}
+	}
+}
+
 /*
  *	mdexists() -- Does the physical file exist?
  *
@@ -218,6 +288,8 @@ mdcreate(SMgrRelation reln, ForkNumber forkNum, bool isRedo)
 					 errmsg("could not create file \"%s\": %m", path)));
 		}
 	}
+	if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		RegisterSessionRelation(reln, forkNum);
 
 	pfree(path);
 
@@ -465,6 +537,21 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 
 	if (fd < 0)
 	{
+		/*
+		 * In case of session relation access, there may be no yet files of this relation for this backend.
+		 * If so, then create file and register session relation for truncation on backend exit.
+		 */
+		if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
+			fd = PathNameOpenFile(path, O_RDWR | PG_BINARY | O_CREAT);
+			if (fd >= 0)
+			{
+				RegisterSessionRelation(reln, forknum);
+				if (!(behavior & EXTENSION_RETURN_NULL))
+					RegisterOnCommitAction(reln, forknum);
+				goto NewSegment;
+			}
+		}
 		if ((behavior & EXTENSION_RETURN_NULL) &&
 			FILE_POSSIBLY_DELETED(errno))
 		{
@@ -476,6 +563,7 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 				 errmsg("could not open file \"%s\": %m", path)));
 	}
 
+  NewSegment:
 	pfree(path);
 
 	_fdvec_resize(reln, forknum, 1);
@@ -599,7 +687,7 @@ mdwriteback(SMgrRelation reln, ForkNumber forknum,
  */
 void
 mdread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
-	   char *buffer)
+	   char *buffer, bool skipInit)
 {
 	off_t		seekpos;
 	int			nbytes;
@@ -644,8 +732,13 @@ mdread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
 		 * complaining.  This allows, for example, the case of trying to
 		 * update a block that was later truncated away.
 		 */
-		if (zero_damaged_pages || InRecovery)
+		if (zero_damaged_pages || InRecovery || RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
 			MemSet(buffer, 0, BLCKSZ);
+			/* In case of session relation we need to write zero page to provide correct result of subsequent mdnblocks */
+			if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode) && !skipInit)
+				mdwrite(reln, forknum, blocknum, buffer, true);
+		}
 		else
 			ereport(ERROR,
 					(errcode(ERRCODE_DATA_CORRUPTED),
@@ -735,7 +828,8 @@ mdnblocks(SMgrRelation reln, ForkNumber forknum)
 	BlockNumber segno = 0;
 
 	/* mdopen has opened the first segment */
-	Assert(reln->md_num_open_segs[forknum] > 0);
+	if (reln->md_num_open_segs[forknum] == 0)
+		return 0;
 
 	/*
 	 * Start from the last open segments, to avoid redundant seeks.  We have
diff --git a/src/backend/storage/smgr/smgr.c b/src/backend/storage/smgr/smgr.c
index 360b5bf..a7b491b 100644
--- a/src/backend/storage/smgr/smgr.c
+++ b/src/backend/storage/smgr/smgr.c
@@ -52,7 +52,7 @@ typedef struct f_smgr
 	void		(*smgr_prefetch) (SMgrRelation reln, ForkNumber forknum,
 								  BlockNumber blocknum);
 	void		(*smgr_read) (SMgrRelation reln, ForkNumber forknum,
-							  BlockNumber blocknum, char *buffer);
+							  BlockNumber blocknum, char *buffer, bool skipInit);
 	void		(*smgr_write) (SMgrRelation reln, ForkNumber forknum,
 							   BlockNumber blocknum, char *buffer, bool skipFsync);
 	void		(*smgr_writeback) (SMgrRelation reln, ForkNumber forknum,
@@ -506,9 +506,9 @@ smgrprefetch(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum)
  */
 void
 smgrread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
-		 char *buffer)
+		 char *buffer, bool skipInit)
 {
-	smgrsw[reln->smgr_which].smgr_read(reln, forknum, blocknum, buffer);
+	smgrsw[reln->smgr_which].smgr_read(reln, forknum, blocknum, buffer, skipInit);
 }
 
 /*
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 8406644..0416549 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -994,6 +994,9 @@ pg_relation_filepath(PG_FUNCTION_ARGS)
 	/* Determine owning backend. */
 	switch (relform->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/utils/cache/catcache.c b/src/backend/utils/cache/catcache.c
index 64776e3..4996d88 100644
--- a/src/backend/utils/cache/catcache.c
+++ b/src/backend/utils/cache/catcache.c
@@ -1191,6 +1191,110 @@ SearchCatCache4(CatCache *cache,
 	return SearchCatCacheInternal(cache, 4, v1, v2, v3, v4);
 }
 
+
+void InsertCatCache(CatCache *cache,
+					Datum v1, Datum v2, Datum v3, Datum v4,
+					HeapTuple tuple)
+{
+	Datum		arguments[CATCACHE_MAXKEYS];
+	uint32		hashValue;
+	Index		hashIndex;
+	CatCTup    *ct;
+	dlist_iter	iter;
+	dlist_head *bucket;
+	int         nkeys = cache->cc_nkeys;
+	MemoryContext oldcxt;
+
+	/*
+	 * one-time startup overhead for each cache
+	 */
+	if (unlikely(cache->cc_tupdesc == NULL))
+		CatalogCacheInitializeCache(cache);
+
+	/* Initialize local parameter array */
+	arguments[0] = v1;
+	arguments[1] = v2;
+	arguments[2] = v3;
+	arguments[3] = v4;
+	/*
+	 * find the hash bucket in which to look for the tuple
+	 */
+	hashValue = CatalogCacheComputeHashValue(cache, nkeys, v1, v2, v3, v4);
+	hashIndex = HASH_INDEX(hashValue, cache->cc_nbuckets);
+
+	/*
+	 * scan the hash bucket until we find a match or exhaust our tuples
+	 *
+	 * Note: it's okay to use dlist_foreach here, even though we modify the
+	 * dlist within the loop, because we don't continue the loop afterwards.
+	 */
+	bucket = &cache->cc_bucket[hashIndex];
+	dlist_foreach(iter, bucket)
+	{
+		ct = dlist_container(CatCTup, cache_elem, iter.cur);
+
+		if (ct->dead)
+			continue;			/* ignore dead entries */
+
+		if (ct->hash_value != hashValue)
+			continue;			/* quickly skip entry if wrong hash val */
+
+		if (!CatalogCacheCompareTuple(cache, nkeys, ct->keys, arguments))
+			continue;
+
+		/*
+		 * If it's a positive entry, bump its refcount and return it. If it's
+		 * negative, we can report failure to the caller.
+		 */
+		if (ct->tuple.t_len == tuple->t_len)
+		{
+			memcpy((char *) ct->tuple.t_data,
+				   (const char *) tuple->t_data,
+				   tuple->t_len);
+			return;
+		}
+		dlist_delete(&ct->cache_elem);
+		pfree(ct);
+		cache->cc_ntup -= 1;
+		CacheHdr->ch_ntup -= 1;
+		break;
+	}
+	/* Allocate memory for CatCTup and the cached tuple in one go */
+	oldcxt = MemoryContextSwitchTo(CacheMemoryContext);
+
+	ct = (CatCTup *) palloc(sizeof(CatCTup) +
+							MAXIMUM_ALIGNOF + tuple->t_len);
+	ct->tuple.t_len = tuple->t_len;
+	ct->tuple.t_self = tuple->t_self;
+	ct->tuple.t_tableOid = tuple->t_tableOid;
+	ct->tuple.t_data = (HeapTupleHeader)
+		MAXALIGN(((char *) ct) + sizeof(CatCTup));
+	/* copy tuple contents */
+	memcpy((char *) ct->tuple.t_data,
+		   (const char *) tuple->t_data,
+		   tuple->t_len);
+	ct->ct_magic = CT_MAGIC;
+	ct->my_cache = cache;
+	ct->c_list = NULL;
+	ct->refcount = 1;			/* pinned*/
+	ct->dead = false;
+	ct->negative = false;
+	ct->hash_value = hashValue;
+	dlist_push_head(&cache->cc_bucket[hashIndex], &ct->cache_elem);
+	memcpy(ct->keys, arguments, nkeys*sizeof(Datum));
+
+	cache->cc_ntup++;
+	CacheHdr->ch_ntup++;
+	MemoryContextSwitchTo(oldcxt);
+
+	/*
+	 * If the hash table has become too full, enlarge the buckets array. Quite
+	 * arbitrarily, we enlarge when fill factor > 2.
+	 */
+	if (cache->cc_ntup > cache->cc_nbuckets * 2)
+		RehashCatCache(cache);
+}
+
 /*
  * Work-horse for SearchCatCache/SearchCatCacheN.
  */
diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c
index df025a5..dd0b1ff 100644
--- a/src/backend/utils/cache/relcache.c
+++ b/src/backend/utils/cache/relcache.c
@@ -1092,6 +1092,10 @@ RelationBuildDesc(Oid targetRelId, bool insertIt)
 	relation->rd_newRelfilenodeSubid = InvalidSubTransactionId;
 	switch (relation->rd_rel->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			relation->rd_backend = BackendIdForSessionRelations();
+			relation->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			relation->rd_backend = InvalidBackendId;
@@ -3303,6 +3307,10 @@ RelationBuildLocalRelation(const char *relname,
 	rel->rd_rel->relpersistence = relpersistence;
 	switch (relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			rel->rd_backend = BackendIdForSessionRelations();
+			rel->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			rel->rd_backend = InvalidBackendId;
diff --git a/src/backend/utils/cache/syscache.c b/src/backend/utils/cache/syscache.c
index 53d9ddf..f263b83 100644
--- a/src/backend/utils/cache/syscache.c
+++ b/src/backend/utils/cache/syscache.c
@@ -1156,6 +1156,16 @@ SearchSysCache4(int cacheId,
 	return SearchCatCache4(SysCache[cacheId], key1, key2, key3, key4);
 }
 
+void
+InsertSysCache(int cacheId,
+			   Datum key1, Datum key2, Datum key3, Datum key4,
+			   HeapTuple value)
+{
+	Assert(cacheId >= 0 && cacheId < SysCacheSize &&
+		   PointerIsValid(SysCache[cacheId]));
+	InsertCatCache(SysCache[cacheId], key1, key2, key3, key4, value);
+}
+
 /*
  * ReleaseSysCache
  *		Release previously grabbed reference count on a tuple
diff --git a/src/backend/utils/fmgr/funcapi.c b/src/backend/utils/fmgr/funcapi.c
index b7eee3d..afe22b2 100644
--- a/src/backend/utils/fmgr/funcapi.c
+++ b/src/backend/utils/fmgr/funcapi.c
@@ -18,6 +18,7 @@
 #include "catalog/namespace.h"
 #include "catalog/pg_proc.h"
 #include "catalog/pg_type.h"
+#include "catalog/pg_statistic_d.h"
 #include "funcapi.h"
 #include "nodes/nodeFuncs.h"
 #include "parser/parse_coerce.h"
@@ -30,6 +31,13 @@
 #include "utils/syscache.h"
 #include "utils/typcache.h"
 
+/*
+ * TODO: find less ugly way to declare core function returning pg_statistics.
+ * OID of pg_gtt_statistic_for_relation. This function should be handled in special way because it returns set of pg_statistics
+ * which contains attributes of anyarray type. Type of attributes can not be deduced from input parameters and
+ * it prevents using tuple descriptor in this case.
+ */
+#define GttStatisticFunctionId 3434
 
 static void shutdown_MultiFuncCall(Datum arg);
 static TypeFuncClass internal_get_result_type(Oid funcid,
@@ -341,7 +349,8 @@ internal_get_result_type(Oid funcid,
 
 		if (resolve_polymorphic_tupdesc(tupdesc,
 										&procform->proargtypes,
-										call_expr))
+										call_expr) ||
+			funcid == GttStatisticFunctionId)
 		{
 			if (tupdesc->tdtypeid == RECORDOID &&
 				tupdesc->tdtypmod < 0)
diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
index ec3e2c6..4c15822 100644
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -15635,8 +15635,8 @@ dumpTableSchema(Archive *fout, TableInfo *tbinfo)
 											 tbinfo->dobj.catId.oid, false);
 
 		appendPQExpBuffer(q, "CREATE %s%s %s",
-						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ?
-						  "UNLOGGED " : "",
+						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ? "UNLOGGED "
+						  : tbinfo->relpersistence == RELPERSISTENCE_SESSION ? "SESSION " : "",
 						  reltypename,
 						  qualrelname);
 
diff --git a/src/common/relpath.c b/src/common/relpath.c
index ad733d1..be38d17 100644
--- a/src/common/relpath.c
+++ b/src/common/relpath.c
@@ -169,7 +169,18 @@ GetRelationPath(Oid dbNode, Oid spcNode, Oid relNode,
 		}
 		else
 		{
-			if (forkNumber != MAIN_FORKNUM)
+			/*
+			 * Session relations are distinguished from local temp relations by adding
+			 * SessionRelFirstBackendId offset to backendId.
+			 * These is no need to separate them at file system level, so just subtract SessionRelFirstBackendId
+			 * to avoid too long file names.
+			 * Segments of session relations have the same prefix (t%d_) as local temporary relations
+			 * to make it possible to cleanup them in the same way as local temporary relation files.
+			 */
+			 if (backendId >= SessionRelFirstBackendId)
+				 backendId -= SessionRelFirstBackendId;
+
+			 if (forkNumber != MAIN_FORKNUM)
 				path = psprintf("base/%u/t%d_%u_%s",
 								dbNode, backendId, relNode,
 								forkNames[forkNumber]);
diff --git a/src/include/catalog/pg_class.h b/src/include/catalog/pg_class.h
index a12fc1f..89c3645 100644
--- a/src/include/catalog/pg_class.h
+++ b/src/include/catalog/pg_class.h
@@ -165,6 +165,7 @@ typedef FormData_pg_class *Form_pg_class;
 #define		  RELPERSISTENCE_PERMANENT	'p' /* regular table */
 #define		  RELPERSISTENCE_UNLOGGED	'u' /* unlogged permanent table */
 #define		  RELPERSISTENCE_TEMP		't' /* temporary table */
+#define		  RELPERSISTENCE_SESSION	's' /* session table */
 
 /* default selection for replica identity (primary key or nothing) */
 #define		  REPLICA_IDENTITY_DEFAULT	'd'
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 2228256..6757491 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -5503,7 +5503,14 @@
   proname => 'pg_stat_get_xact_function_self_time', provolatile => 'v',
   proparallel => 'r', prorettype => 'float8', proargtypes => 'oid',
   prosrc => 'pg_stat_get_xact_function_self_time' },
-
+{ oid => '3434',
+  descr => 'show local statistics for global temp table',
+  proname => 'pg_gtt_statistic_for_relation', provolatile => 'v', proparallel => 'u',
+  prorettype => 'record', proretset => 't', prorows => '100', proargtypes => 'oid',
+  proallargtypes => '{oid,oid,int2,bool,float4,int4,float4,int2,int2,int2,int2,int2,oid,oid,oid,oid,oid,oid,oid,oid,oid,oid,_float4,_float4,_float4,_float4,_float4,anyarray,anyarray,anyarray,anyarray,anyarray}',
+  proargmodes => '{i,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o}',
+  proargnames => '{relid,starelid,staattnum,stainherit,stanullfrac,stawidth,stadistinct,stakind1,stakind2,stakind3,stakind4,stakind5,staop1,staop2,staop3,staop4,staop5,stacoll1,stacoll2,stacoll3,stacoll4,stacoll5,stanumbers1,stanumbers2,stanumbers3,stanumbers4,stanumbers5,stavalues1,stavalues2,stavalues3,stavalues4,stavalues5}',
+  prosrc => 'pg_gtt_statistic_for_relation' },
 { oid => '3788',
   descr => 'statistics: timestamp of the current statistics snapshot',
   proname => 'pg_stat_get_snapshot_timestamp', provolatile => 's',
diff --git a/src/include/storage/backendid.h b/src/include/storage/backendid.h
index 0c776a3..124fc3c 100644
--- a/src/include/storage/backendid.h
+++ b/src/include/storage/backendid.h
@@ -22,6 +22,13 @@ typedef int BackendId;			/* unique currently active backend identifier */
 
 #define InvalidBackendId		(-1)
 
+/*
+ * We need to distinguish local and global temporary relations by RelFileNodeBackend.
+ * The least invasive change is to add some special bias value to backend id (since 
+ * maximal number of backed is limited by MaxBackends).
+ */
+#define SessionRelFirstBackendId (0x40000000)
+
 extern PGDLLIMPORT BackendId MyBackendId;	/* backend id of this backend */
 
 /* backend id of our parallel session leader, or InvalidBackendId if none */
@@ -34,4 +41,12 @@ extern PGDLLIMPORT BackendId ParallelMasterBackendId;
 #define BackendIdForTempRelations() \
 	(ParallelMasterBackendId == InvalidBackendId ? MyBackendId : ParallelMasterBackendId)
 
+
+#define BackendIdForSessionRelations() \
+	(BackendIdForTempRelations() + SessionRelFirstBackendId)
+
+#define IsSessionRelationBackendId(id) ((id) >= SessionRelFirstBackendId)
+
+#define GetRelationBackendId(id) ((id) & ~SessionRelFirstBackendId)
+
 #endif							/* BACKENDID_H */
diff --git a/src/include/storage/bufmgr.h b/src/include/storage/bufmgr.h
index 73c7e9b..467134c 100644
--- a/src/include/storage/bufmgr.h
+++ b/src/include/storage/bufmgr.h
@@ -231,6 +231,7 @@ extern void TestForOldSnapshot_impl(Snapshot snapshot, Relation relation);
 extern BufferAccessStrategy GetAccessStrategy(BufferAccessStrategyType btype);
 extern void FreeAccessStrategy(BufferAccessStrategy strategy);
 
+extern void InitGTTIndexes(Relation rel);
 
 /* inline functions */
 
diff --git a/src/include/storage/bufpage.h b/src/include/storage/bufpage.h
index 3f88683..7ecef10 100644
--- a/src/include/storage/bufpage.h
+++ b/src/include/storage/bufpage.h
@@ -229,6 +229,13 @@ typedef PageHeaderData *PageHeader;
 #define PageIsNew(page) (((PageHeader) (page))->pd_upper == 0)
 
 /*
+ * Page of temporary relation is not initialized
+ */
+#define GlobalTempRelationPageIsNotInitialized(rel, page) \
+	((rel)->rd_rel->relpersistence == RELPERSISTENCE_SESSION && PageIsNew(page))
+
+
+/*
  * PageGetItemId
  *		Returns an item identifier of a page.
  */
diff --git a/src/include/storage/md.h b/src/include/storage/md.h
index ec7630c..5683883 100644
--- a/src/include/storage/md.h
+++ b/src/include/storage/md.h
@@ -31,7 +31,7 @@ extern void mdextend(SMgrRelation reln, ForkNumber forknum,
 extern void mdprefetch(SMgrRelation reln, ForkNumber forknum,
 					   BlockNumber blocknum);
 extern void mdread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
-				   char *buffer);
+				   char *buffer, bool skipInit);
 extern void mdwrite(SMgrRelation reln, ForkNumber forknum,
 					BlockNumber blocknum, char *buffer, bool skipFsync);
 extern void mdwriteback(SMgrRelation reln, ForkNumber forknum,
diff --git a/src/include/storage/relfilenode.h b/src/include/storage/relfilenode.h
index 4de9fc1..c45040b 100644
--- a/src/include/storage/relfilenode.h
+++ b/src/include/storage/relfilenode.h
@@ -75,10 +75,25 @@ typedef struct RelFileNodeBackend
 	BackendId	backend;
 } RelFileNodeBackend;
 
+/*
+ * Check whether it is local or global temporary relation, which data belongs only to one backend.
+ */
 #define RelFileNodeBackendIsTemp(rnode) \
 	((rnode).backend != InvalidBackendId)
 
 /*
+ * Check whether it is global temporary relation which metadata is shared by all sessions,
+ * but data is private for the current session.
+ */
+#define RelFileNodeBackendIsGlobalTemp(rnode) IsSessionRelationBackendId((rnode).backend)
+
+/*
+ * Check whether it is local temporary relation which exists only in this backend.
+ */
+#define RelFileNodeBackendIsLocalTemp(rnode) \
+	(RelFileNodeBackendIsTemp(rnode) && !RelFileNodeBackendIsGlobalTemp(rnode))
+
+/*
  * Note: RelFileNodeEquals and RelFileNodeBackendEquals compare relNode first
  * since that is most likely to be different in two unequal RelFileNodes.  It
  * is probably redundant to compare spcNode if the other fields are found equal,
diff --git a/src/include/storage/smgr.h b/src/include/storage/smgr.h
index 2438221..a4a2da2 100644
--- a/src/include/storage/smgr.h
+++ b/src/include/storage/smgr.h
@@ -95,7 +95,7 @@ extern void smgrextend(SMgrRelation reln, ForkNumber forknum,
 extern void smgrprefetch(SMgrRelation reln, ForkNumber forknum,
 						 BlockNumber blocknum);
 extern void smgrread(SMgrRelation reln, ForkNumber forknum,
-					 BlockNumber blocknum, char *buffer);
+					 BlockNumber blocknum, char *buffer, bool skipInit);
 extern void smgrwrite(SMgrRelation reln, ForkNumber forknum,
 					  BlockNumber blocknum, char *buffer, bool skipFsync);
 extern void smgrwriteback(SMgrRelation reln, ForkNumber forknum,
diff --git a/src/include/utils/catcache.h b/src/include/utils/catcache.h
index f4aa316..365b02a 100644
--- a/src/include/utils/catcache.h
+++ b/src/include/utils/catcache.h
@@ -228,4 +228,8 @@ extern void PrepareToInvalidateCacheTuple(Relation relation,
 extern void PrintCatCacheLeakWarning(HeapTuple tuple);
 extern void PrintCatCacheListLeakWarning(CatCList *list);
 
+extern void InsertCatCache(CatCache *cache,
+						   Datum v1, Datum v2, Datum v3, Datum v4,
+						   HeapTuple tuple);
+
 #endif							/* CATCACHE_H */
diff --git a/src/include/utils/rel.h b/src/include/utils/rel.h
index 44ed04d..ae56427 100644
--- a/src/include/utils/rel.h
+++ b/src/include/utils/rel.h
@@ -277,6 +277,7 @@ typedef struct StdRdOptions
 	int			parallel_workers;	/* max number of parallel workers */
 	bool		vacuum_index_cleanup;	/* enables index vacuuming and cleanup */
 	bool		vacuum_truncate;	/* enables vacuum to truncate a relation */
+	bool		on_commit_delete_rows;	/* global temp table */
 } StdRdOptions;
 
 #define HEAP_MIN_FILLFACTOR			10
@@ -332,6 +333,18 @@ typedef struct StdRdOptions
 	((relation)->rd_options ? \
 	 ((StdRdOptions *) (relation)->rd_options)->parallel_workers : (defaultpw))
 
+/*
+ * Relation persistence is either TEMP either SESSION
+ */
+#define IsLocalRelpersistence(relpersistence) \
+	((relpersistence) == RELPERSISTENCE_TEMP || (relpersistence) == RELPERSISTENCE_SESSION)
+
+/*
+ * Relation is either global either local temp table
+ */
+#define RelationHasSessionScope(relation) \
+	IsLocalRelpersistence(((relation)->rd_rel->relpersistence))
+
 /* ViewOptions->check_option values */
 typedef enum ViewOptCheckOption
 {
@@ -340,6 +353,7 @@ typedef enum ViewOptCheckOption
 	VIEW_OPTION_CHECK_OPTION_CASCADED
 } ViewOptCheckOption;
 
+
 /*
  * ViewOptions
  *		Contents of rd_options for views
@@ -535,7 +549,7 @@ typedef struct ViewOptions
  *		True if relation's pages are stored in local buffers.
  */
 #define RelationUsesLocalBuffers(relation) \
-	((relation)->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
+	RelationHasSessionScope(relation)
 
 /*
  * RELATION_IS_LOCAL
diff --git a/src/include/utils/syscache.h b/src/include/utils/syscache.h
index f27b73d..eaf21d9 100644
--- a/src/include/utils/syscache.h
+++ b/src/include/utils/syscache.h
@@ -216,4 +216,8 @@ extern bool RelationSupportsSysCache(Oid relid);
 
 #define ReleaseSysCacheList(x)	ReleaseCatCacheList(x)
 
+
+extern void InsertSysCache(int cacheId, 
+						   Datum v1, Datum v2, Datum v3, Datum v4,
+						   HeapTuple tuple);
 #endif							/* SYSCACHE_H */
diff --git a/src/test/isolation/expected/inherit-global-temp.out b/src/test/isolation/expected/inherit-global-temp.out
new file mode 100644
index 0000000..6114f8c
--- /dev/null
+++ b/src/test/isolation/expected/inherit-global-temp.out
@@ -0,0 +1,218 @@
+Parsed test spec with 2 sessions
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_update_p s1_update_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_update_p: UPDATE inh_global_parent SET a = 11 WHERE a = 1;
+step s1_update_c: UPDATE inh_global_parent SET a = 13 WHERE a IN (3, 5);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+2              
+11             
+4              
+13             
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+4              
+13             
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+2              
+11             
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_update_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_update_c: UPDATE inh_global_parent SET a = 15 WHERE a IN (3, 5);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+6              
+15             
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+6              
+15             
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_delete_p s1_delete_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_delete_p: DELETE FROM inh_global_parent WHERE a = 2;
+step s1_delete_c: DELETE FROM inh_global_parent WHERE a IN (4, 6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+3              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_delete_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_delete_c: DELETE FROM inh_global_parent WHERE a IN (4, 6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+5              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_truncate_p s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_truncate_p s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_truncate_p: TRUNCATE inh_global_parent;
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_begin s1_truncate_p s2_select_p s1_commit
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_begin: BEGIN;
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s2_select_p: SELECT a FROM inh_global_parent; <waiting ...>
+step s1_commit: COMMIT;
+step s2_select_p: <... completed>
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_begin s1_truncate_p s2_select_c s1_commit
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_begin: BEGIN;
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2; <waiting ...>
+step s1_commit: COMMIT;
+step s2_select_c: <... completed>
+a              
+
+5              
+6              
diff --git a/src/test/isolation/isolation_schedule b/src/test/isolation/isolation_schedule
index a2fa192..ef7aa85 100644
--- a/src/test/isolation/isolation_schedule
+++ b/src/test/isolation/isolation_schedule
@@ -88,3 +88,4 @@ test: plpgsql-toast
 test: truncate-conflict
 test: serializable-parallel
 test: serializable-parallel-2
+test: inherit-global-temp
diff --git a/src/test/isolation/specs/inherit-global-temp.spec b/src/test/isolation/specs/inherit-global-temp.spec
new file mode 100644
index 0000000..5e95dd6
--- /dev/null
+++ b/src/test/isolation/specs/inherit-global-temp.spec
@@ -0,0 +1,73 @@
+# This is a copy of the inherit-temp test with little changes for global temporary tables.
+#
+
+setup
+{
+  CREATE TABLE inh_global_parent (a int);
+}
+
+teardown
+{
+  DROP TABLE inh_global_parent;
+}
+
+# Session 1 executes actions which act directly on both the parent and
+# its child.  Abbreviation "c" is used for queries working on the child
+# and "p" on the parent.
+session "s1"
+setup
+{
+  CREATE GLOBAL TEMPORARY TABLE inh_global_temp_child_s1 () INHERITS (inh_global_parent);
+}
+step "s1_begin" { BEGIN; }
+step "s1_truncate_p" { TRUNCATE inh_global_parent; }
+step "s1_select_p" { SELECT a FROM inh_global_parent; }
+step "s1_select_c" { SELECT a FROM inh_global_temp_child_s1; }
+step "s1_insert_p" { INSERT INTO inh_global_parent VALUES (1), (2); }
+step "s1_insert_c" { INSERT INTO inh_global_temp_child_s1 VALUES (3), (4); }
+step "s1_update_p" { UPDATE inh_global_parent SET a = 11 WHERE a = 1; }
+step "s1_update_c" { UPDATE inh_global_parent SET a = 13 WHERE a IN (3, 5); }
+step "s1_delete_p" { DELETE FROM inh_global_parent WHERE a = 2; }
+step "s1_delete_c" { DELETE FROM inh_global_parent WHERE a IN (4, 6); }
+step "s1_commit" { COMMIT; }
+teardown
+{
+  DROP TABLE inh_global_temp_child_s1;
+}
+
+# Session 2 executes actions on the parent which act only on the child.
+session "s2"
+setup
+{
+  CREATE GLOBAL TEMPORARY TABLE inh_global_temp_child_s2 () INHERITS (inh_global_parent);
+}
+step "s2_truncate_p" { TRUNCATE inh_global_parent; }
+step "s2_select_p" { SELECT a FROM inh_global_parent; }
+step "s2_select_c" { SELECT a FROM inh_global_temp_child_s2; }
+step "s2_insert_c" { INSERT INTO inh_global_temp_child_s2 VALUES (5), (6); }
+step "s2_update_c" { UPDATE inh_global_parent SET a = 15 WHERE a IN (3, 5); }
+step "s2_delete_c" { DELETE FROM inh_global_parent WHERE a IN (4, 6); }
+teardown
+{
+  DROP TABLE inh_global_temp_child_s2;
+}
+
+# Check INSERT behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check UPDATE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_update_p" "s1_update_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_update_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check DELETE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_delete_p" "s1_delete_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_delete_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check TRUNCATE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_truncate_p" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_truncate_p" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# TRUNCATE on a parent tree does not block access to temporary child relation
+# of another session, and blocks when scanning the parent.
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_begin" "s1_truncate_p" "s2_select_p" "s1_commit"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_begin" "s1_truncate_p" "s2_select_c" "s1_commit"
diff --git a/src/test/regress/expected/global_temp.out b/src/test/regress/expected/global_temp.out
new file mode 100644
index 0000000..ae1adb6
--- /dev/null
+++ b/src/test/regress/expected/global_temp.out
@@ -0,0 +1,247 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+-- Test ON COMMIT DELETE ROWS
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+   2
+(2 rows)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+(1 row)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+ col 
+-----
+   1
+(1 row)
+
+SELECT * FROM global_temptest2;
+ col 
+-----
+(0 rows)
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+ERROR:  unsupported ON COMMIT and foreign key combination
+DETAIL:  Table "global_temptest4" references "global_temptest3", but they do not have the same ON COMMIT setting.
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+ a 
+---
+(0 rows)
+
+DROP TABLE temp_parted_oncommit;
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+              relname              
+-----------------------------------
+ global_temp_parted_oncommit_test
+ global_temp_parted_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_parted_oncommit_test;
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+            relname             
+--------------------------------
+ global_temp_inh_oncommit_test
+ global_temp_inh_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ERROR:  cannot inherit from temporary relation "global_temp_table"
+ROLLBACK;
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM global_temp_table;
+ a 
+---
+ 1
+(1 row)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+(2 rows)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       1
+(1 row)
+
+\c
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+(0 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       2
+(1 row)
+
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       3
+(1 row)
+
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
diff --git a/src/test/regress/expected/rules.out b/src/test/regress/expected/rules.out
index 2ab2115..7538601 100644
--- a/src/test/regress/expected/rules.out
+++ b/src/test/regress/expected/rules.out
@@ -1349,6 +1349,40 @@ pg_group| SELECT pg_authid.rolname AS groname,
           WHERE (pg_auth_members.roleid = pg_authid.oid)) AS grolist
    FROM pg_authid
   WHERE (NOT pg_authid.rolcanlogin);
+pg_gtt_statistic| SELECT s.starelid,
+    s.staattnum,
+    s.stainherit,
+    s.stanullfrac,
+    s.stawidth,
+    s.stadistinct,
+    s.stakind1,
+    s.stakind2,
+    s.stakind3,
+    s.stakind4,
+    s.stakind5,
+    s.staop1,
+    s.staop2,
+    s.staop3,
+    s.staop4,
+    s.staop5,
+    s.stacoll1,
+    s.stacoll2,
+    s.stacoll3,
+    s.stacoll4,
+    s.stacoll5,
+    s.stanumbers1,
+    s.stanumbers2,
+    s.stanumbers3,
+    s.stanumbers4,
+    s.stanumbers5,
+    s.stavalues1,
+    s.stavalues2,
+    s.stavalues3,
+    s.stavalues4,
+    s.stavalues5
+   FROM pg_class c,
+    LATERAL pg_gtt_statistic_for_relation(c.oid) s(starelid, staattnum, stainherit, stanullfrac, stawidth, stadistinct, stakind1, stakind2, stakind3, stakind4, stakind5, staop1, staop2, staop3, staop4, staop5, stacoll1, stacoll2, stacoll3, stacoll4, stacoll5, stanumbers1, stanumbers2, stanumbers3, stanumbers4, stanumbers5, stavalues1, stavalues2, stavalues3, stavalues4, stavalues5)
+  WHERE (c.relpersistence = 's'::"char");
 pg_hba_file_rules| SELECT a.line_number,
     a.type,
     a.database,
diff --git a/src/test/regress/expected/session_table.out b/src/test/regress/expected/session_table.out
new file mode 100644
index 0000000..1b9b3f4
--- /dev/null
+++ b/src/test/regress/expected/session_table.out
@@ -0,0 +1,64 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+ count 
+-------
+ 10000
+(1 row)
+
+\c
+select count(*) from my_private_table;
+ count 
+-------
+     0
+(1 row)
+
+select * from my_private_table where x=10001;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select * from my_private_table where y=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select count(*) from my_private_table;
+ count  
+--------
+ 100000
+(1 row)
+
+\c
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+   x    |   y    
+--------+--------
+ 100000 | 100000
+(1 row)
+
+drop table  my_private_table;
diff --git a/src/test/regress/parallel_schedule b/src/test/regress/parallel_schedule
index d2b17dd..71c8ca4 100644
--- a/src/test/regress/parallel_schedule
+++ b/src/test/regress/parallel_schedule
@@ -107,7 +107,7 @@ test: json jsonb json_encoding jsonpath jsonpath_encoding jsonb_jsonpath
 # NB: temp.sql does a reconnect which transiently uses 2 connections,
 # so keep this parallel group to at most 19 tests
 # ----------
-test: plancache limit plpgsql copy2 temp domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
+test: plancache limit plpgsql copy2 temp global_temp session_table domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
 
 # ----------
 # Another group of parallel tests
diff --git a/src/test/regress/serial_schedule b/src/test/regress/serial_schedule
index acba391..71abe08 100644
--- a/src/test/regress/serial_schedule
+++ b/src/test/regress/serial_schedule
@@ -172,6 +172,8 @@ test: limit
 test: plpgsql
 test: copy2
 test: temp
+test: global_temp
+test: session_table
 test: domain
 test: rangefuncs
 test: prepare
diff --git a/src/test/regress/sql/global_temp.sql b/src/test/regress/sql/global_temp.sql
new file mode 100644
index 0000000..3058b9b
--- /dev/null
+++ b/src/test/regress/sql/global_temp.sql
@@ -0,0 +1,151 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+
+-- Test ON COMMIT DELETE ROWS
+
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+SELECT * FROM global_temptest2;
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+DROP TABLE temp_parted_oncommit;
+
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+DROP TABLE global_temp_parted_oncommit_test;
+
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ROLLBACK;
+
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+COMMIT;
+SELECT * FROM global_temp_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+COMMIT;
+SELECT * FROM normal_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+\c
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
diff --git a/src/test/regress/sql/session_table.sql b/src/test/regress/sql/session_table.sql
new file mode 100644
index 0000000..c6663dc
--- /dev/null
+++ b/src/test/regress/sql/session_table.sql
@@ -0,0 +1,18 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+\c
+select count(*) from my_private_table;
+select * from my_private_table where x=10001;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+select * from my_private_table where y=10001;
+select count(*) from my_private_table;
+\c
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+drop table  my_private_table;

diff --git a/contrib/pg_prewarm/pg_prewarm.c b/contrib/pg_prewarm/pg_prewarm.c
index 33e2d28..93059ef 100644
--- a/contrib/pg_prewarm/pg_prewarm.c
+++ b/contrib/pg_prewarm/pg_prewarm.c
@@ -178,7 +178,7 @@ pg_prewarm(PG_FUNCTION_ARGS)
 		for (block = first_block; block <= last_block; ++block)
 		{
 			CHECK_FOR_INTERRUPTS();
-			smgrread(rel->rd_smgr, forkNumber, block, blockbuffer.data);
+			smgrread(rel->rd_smgr, forkNumber, block, blockbuffer.data, false);
 			++blocks_done;
 		}
 	}
diff --git a/src/backend/access/common/reloptions.c b/src/backend/access/common/reloptions.c
index 79430d2..39baddc 100644
--- a/src/backend/access/common/reloptions.c
+++ b/src/backend/access/common/reloptions.c
@@ -158,6 +158,19 @@ static relopt_bool boolRelOpts[] =
 		},
 		true
 	},
+	/*
+	 * For global temp table only
+	 * use AccessExclusiveLock for ensure safety
+	 */
+	{
+		{
+			"on_commit_delete_rows",
+			"global temp table on commit options",
+			RELOPT_KIND_HEAP | RELOPT_KIND_PARTITIONED,
+			ShareUpdateExclusiveLock
+		},
+		false
+	},
 	/* list terminator */
 	{{NULL}}
 };
@@ -1486,6 +1499,8 @@ bytea *
 default_reloptions(Datum reloptions, bool validate, relopt_kind kind)
 {
 	static const relopt_parse_elt tab[] = {
+		{"on_commit_delete_rows", RELOPT_TYPE_BOOL,
+		offsetof(StdRdOptions, on_commit_delete_rows)},
 		{"fillfactor", RELOPT_TYPE_INT, offsetof(StdRdOptions, fillfactor)},
 		{"autovacuum_enabled", RELOPT_TYPE_BOOL,
 		offsetof(StdRdOptions, autovacuum) + offsetof(AutoVacOpts, enabled)},
@@ -1586,13 +1601,17 @@ build_reloptions(Datum reloptions, bool validate,
 bytea *
 partitioned_table_reloptions(Datum reloptions, bool validate)
 {
+	static const relopt_parse_elt tab[] = {
+		{"on_commit_delete_rows", RELOPT_TYPE_BOOL,
+		offsetof(StdRdOptions, on_commit_delete_rows)}
+	};
 	/*
 	 * There are no options for partitioned tables yet, but this is able to do
 	 * some validation.
 	 */
 	return (bytea *) build_reloptions(reloptions, validate,
 									  RELOPT_KIND_PARTITIONED,
-									  0, NULL, 0);
+									  sizeof(StdRdOptions), tab, lengthof(tab));
 }
 
 /*
diff --git a/src/backend/access/heap/heapam_handler.c b/src/backend/access/heap/heapam_handler.c
index 3fa4b76..a86de50 100644
--- a/src/backend/access/heap/heapam_handler.c
+++ b/src/backend/access/heap/heapam_handler.c
@@ -670,6 +670,7 @@ heapam_relation_copy_data(Relation rel, const RelFileNode *newrnode)
 			 * init fork of an unlogged relation.
 			 */
 			if (rel->rd_rel->relpersistence == RELPERSISTENCE_PERMANENT ||
+				rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ||
 				(rel->rd_rel->relpersistence == RELPERSISTENCE_UNLOGGED &&
 				 forkNum == INIT_FORKNUM))
 				log_smgrcreate(newrnode, forkNum);
diff --git a/src/backend/catalog/catalog.c b/src/backend/catalog/catalog.c
index 7d6acae..7c48e5c 100644
--- a/src/backend/catalog/catalog.c
+++ b/src/backend/catalog/catalog.c
@@ -396,6 +396,9 @@ GetNewRelFileNode(Oid reltablespace, Relation pg_class, char relpersistence)
 		case RELPERSISTENCE_TEMP:
 			backend = BackendIdForTempRelations();
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 8880586..22ce895 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -3707,7 +3707,7 @@ reindex_relation(Oid relid, int flags, int options)
 		if (flags & REINDEX_REL_FORCE_INDEXES_UNLOGGED)
 			persistence = RELPERSISTENCE_UNLOGGED;
 		else if (flags & REINDEX_REL_FORCE_INDEXES_PERMANENT)
-			persistence = RELPERSISTENCE_PERMANENT;
+			persistence = rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION ? RELPERSISTENCE_SESSION : RELPERSISTENCE_PERMANENT;
 		else
 			persistence = rel->rd_rel->relpersistence;
 
diff --git a/src/backend/catalog/storage.c b/src/backend/catalog/storage.c
index fddfbf1..9747835 100644
--- a/src/backend/catalog/storage.c
+++ b/src/backend/catalog/storage.c
@@ -92,6 +92,10 @@ RelationCreateStorage(RelFileNode rnode, char relpersistence)
 			backend = InvalidBackendId;
 			needs_wal = false;
 			break;
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			needs_wal = false;
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
 			needs_wal = true;
@@ -367,7 +371,7 @@ RelationCopyStorage(SMgrRelation src, SMgrRelation dst,
 		/* If we got a cancel signal during the copy of the data, quit */
 		CHECK_FOR_INTERRUPTS();
 
-		smgrread(src, forkNum, blkno, buf.data);
+		smgrread(src, forkNum, blkno, buf.data, false);
 
 		if (!PageIsVerified(page, blkno))
 			ereport(ERROR,
diff --git a/src/backend/catalog/system_views.sql b/src/backend/catalog/system_views.sql
index c9e6060..1f5e52b 100644
--- a/src/backend/catalog/system_views.sql
+++ b/src/backend/catalog/system_views.sql
@@ -1369,7 +1369,15 @@ LANGUAGE INTERNAL
 STRICT STABLE PARALLEL SAFE
 AS 'jsonb_path_query_first_tz';
 
+
+--
+-- Statistic for global temporary tables
 --
+
+CREATE VIEW pg_gtt_statistic AS
+   SELECT s.* from pg_class c,pg_gtt_statistic_for_relation(c.oid) s where c.relpersistence='s';
+
+
 -- The default permissions for functions mean that anyone can execute them.
 -- A number of functions shouldn't be executable by just anyone, but rather
 -- than use explicit 'superuser()' checks in those functions, we use the GRANT
diff --git a/src/backend/commands/analyze.c b/src/backend/commands/analyze.c
index c4420dd..85d8f04 100644
--- a/src/backend/commands/analyze.c
+++ b/src/backend/commands/analyze.c
@@ -40,6 +40,7 @@
 #include "commands/vacuum.h"
 #include "executor/executor.h"
 #include "foreign/fdwapi.h"
+#include "funcapi.h"
 #include "miscadmin.h"
 #include "nodes/nodeFuncs.h"
 #include "parser/parse_oper.h"
@@ -103,7 +104,7 @@ static int	acquire_inherited_sample_rows(Relation onerel, int elevel,
 										  HeapTuple *rows, int targrows,
 										  double *totalrows, double *totaldeadrows);
 static void update_attstats(Oid relid, bool inh,
-							int natts, VacAttrStats **vacattrstats);
+							int natts, VacAttrStats **vacattrstats, bool is_global_temp);
 static Datum std_fetch_func(VacAttrStatsP stats, int rownum, bool *isNull);
 static Datum ind_fetch_func(VacAttrStatsP stats, int rownum, bool *isNull);
 
@@ -323,6 +324,7 @@ do_analyze_rel(Relation onerel, VacuumParams *params,
 	Oid			save_userid;
 	int			save_sec_context;
 	int			save_nestlevel;
+	bool        is_global_temp = onerel->rd_rel->relpersistence == RELPERSISTENCE_SESSION;
 
 	if (inh)
 		ereport(elevel,
@@ -586,14 +588,14 @@ do_analyze_rel(Relation onerel, VacuumParams *params,
 		 * pg_statistic for columns we didn't process, we leave them alone.)
 		 */
 		update_attstats(RelationGetRelid(onerel), inh,
-						attr_cnt, vacattrstats);
+						attr_cnt, vacattrstats, is_global_temp);
 
 		for (ind = 0; ind < nindexes; ind++)
 		{
 			AnlIndexData *thisdata = &indexdata[ind];
 
 			update_attstats(RelationGetRelid(Irel[ind]), false,
-							thisdata->attr_cnt, thisdata->vacattrstats);
+							thisdata->attr_cnt, thisdata->vacattrstats, is_global_temp);
 		}
 
 		/*
@@ -1456,7 +1458,7 @@ acquire_inherited_sample_rows(Relation onerel, int elevel,
  *		by taking a self-exclusive lock on the relation in analyze_rel().
  */
 static void
-update_attstats(Oid relid, bool inh, int natts, VacAttrStats **vacattrstats)
+update_attstats(Oid relid, bool inh, int natts, VacAttrStats **vacattrstats, bool is_global_temp)
 {
 	Relation	sd;
 	int			attno;
@@ -1558,30 +1560,42 @@ update_attstats(Oid relid, bool inh, int natts, VacAttrStats **vacattrstats)
 			}
 		}
 
-		/* Is there already a pg_statistic tuple for this attribute? */
-		oldtup = SearchSysCache3(STATRELATTINH,
-								 ObjectIdGetDatum(relid),
-								 Int16GetDatum(stats->attr->attnum),
-								 BoolGetDatum(inh));
-
-		if (HeapTupleIsValid(oldtup))
+		if (is_global_temp)
 		{
-			/* Yes, replace it */
-			stup = heap_modify_tuple(oldtup,
-									 RelationGetDescr(sd),
-									 values,
-									 nulls,
-									 replaces);
-			ReleaseSysCache(oldtup);
-			CatalogTupleUpdate(sd, &stup->t_self, stup);
+			stup = heap_form_tuple(RelationGetDescr(sd), values, nulls);
+			InsertSysCache(STATRELATTINH,
+						   ObjectIdGetDatum(relid),
+						   Int16GetDatum(stats->attr->attnum),
+						   BoolGetDatum(inh),
+						   0,
+						   stup);
 		}
 		else
 		{
-			/* No, insert new tuple */
-			stup = heap_form_tuple(RelationGetDescr(sd), values, nulls);
-			CatalogTupleInsert(sd, stup);
-		}
+			/* Is there already a pg_statistic tuple for this attribute? */
+			oldtup = SearchSysCache3(STATRELATTINH,
+									 ObjectIdGetDatum(relid),
+									 Int16GetDatum(stats->attr->attnum),
+									 BoolGetDatum(inh));
 
+			if (HeapTupleIsValid(oldtup))
+			{
+				/* Yes, replace it */
+				stup = heap_modify_tuple(oldtup,
+										 RelationGetDescr(sd),
+										 values,
+										 nulls,
+										 replaces);
+				ReleaseSysCache(oldtup);
+				CatalogTupleUpdate(sd, &stup->t_self, stup);
+			}
+			else
+			{
+				/* No, insert new tuple */
+				stup = heap_form_tuple(RelationGetDescr(sd), values, nulls);
+				CatalogTupleInsert(sd, stup);
+			}
+		}
 		heap_freetuple(stup);
 	}
 
@@ -2890,3 +2904,72 @@ analyze_mcv_list(int *mcv_counts,
 	}
 	return num_mcv;
 }
+
+PG_FUNCTION_INFO_V1(pg_gtt_statistic_for_relation);
+
+typedef struct
+{
+	int staattnum;
+	bool stainherit;
+} PgTempStatIteratorCtx;
+
+Datum
+pg_gtt_statistic_for_relation(PG_FUNCTION_ARGS)
+{
+	Oid starelid = PG_GETARG_OID(0);
+	ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
+	Tuplestorestate *tupstore;
+	MemoryContext per_query_ctx;
+	MemoryContext oldcontext;
+	TupleDesc	  tupdesc;
+	bool stainherit = false;
+
+	/* check to see if caller supports us returning a tuplestore */
+	if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
+		elog(ERROR, "return type must be a row type");
+
+	/* check to see if caller supports us returning a tuplestore */
+	if (rsinfo == NULL || !IsA(rsinfo, ReturnSetInfo))
+		ereport(ERROR,
+				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+				 errmsg("set-valued function called in context that cannot accept a set")));
+	if (!(rsinfo->allowedModes & SFRM_Materialize))
+		ereport(ERROR,
+				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+				 errmsg("materialize mode required, but it is not " \
+						"allowed in this context")));
+
+	/* Build tuplestore to hold the result rows */
+	per_query_ctx = rsinfo->econtext->ecxt_per_query_memory;
+	oldcontext = MemoryContextSwitchTo(per_query_ctx);
+
+	/* Build a tuple descriptor for our result type */
+
+	tupstore = tuplestore_begin_heap(true, false, work_mem);
+	rsinfo->returnMode = SFRM_Materialize;
+	rsinfo->setResult = tupstore;
+	rsinfo->setDesc = tupdesc;
+
+	do
+	{
+		int staattnum = 0;
+		while (true)
+		{
+			HeapTuple statup = SearchSysCacheCopy3(STATRELATTINH,
+												   ObjectIdGetDatum(starelid),
+												   Int16GetDatum(++staattnum),
+												   BoolGetDatum(stainherit));
+			if (statup != NULL)
+				tuplestore_puttuple(tupstore, statup);
+			else
+				break;
+		}
+		stainherit = !stainherit;
+	} while (stainherit);
+
+	MemoryContextSwitchTo(oldcontext);
+ 
+	tuplestore_donestoring(tupstore);
+
+	return (Datum) 0;
+}
diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index e9d7a7f..a22a77a 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -391,6 +391,13 @@ cluster_rel(Oid tableOid, Oid indexOid, int options)
 					 errmsg("cannot vacuum temporary tables of other sessions")));
 	}
 
+	/* not support cluster global temp table yet */
+	if (OldHeap->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
+		ereport(ERROR,
+				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+				errmsg("not support cluster global temporary tables yet")));
+
+
 	/*
 	 * Also check for active uses of the relation in the current transaction,
 	 * including open scans and pending AFTER trigger events.
@@ -1399,7 +1406,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap,
 	 */
 	if (newrelpersistence == RELPERSISTENCE_UNLOGGED)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_UNLOGGED;
-	else if (newrelpersistence == RELPERSISTENCE_PERMANENT)
+	else if (newrelpersistence != RELPERSISTENCE_TEMP)
 		reindex_flags |= REINDEX_REL_FORCE_INDEXES_PERMANENT;
 
 	/* Report that we are now reindexing relations */
diff --git a/src/backend/commands/sequence.c b/src/backend/commands/sequence.c
index 6aab73b..bc3c986 100644
--- a/src/backend/commands/sequence.c
+++ b/src/backend/commands/sequence.c
@@ -94,7 +94,7 @@ static HTAB *seqhashtab = NULL; /* hash table for SeqTable items */
  */
 static SeqTableData *last_used_seq = NULL;
 
-static void fill_seq_with_data(Relation rel, HeapTuple tuple);
+static void fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf);
 static Relation lock_and_open_sequence(SeqTable seq);
 static void create_seq_hashtable(void);
 static void init_sequence(Oid relid, SeqTable *p_elm, Relation *p_rel);
@@ -222,7 +222,7 @@ DefineSequence(ParseState *pstate, CreateSeqStmt *seq)
 
 	/* now initialize the sequence's data */
 	tuple = heap_form_tuple(tupDesc, value, null);
-	fill_seq_with_data(rel, tuple);
+	fill_seq_with_data(rel, tuple, InvalidBuffer);
 
 	/* process OWNED BY if given */
 	if (owned_by)
@@ -327,7 +327,7 @@ ResetSequence(Oid seq_relid)
 	/*
 	 * Insert the modified tuple into the new storage file.
 	 */
-	fill_seq_with_data(seq_rel, tuple);
+	fill_seq_with_data(seq_rel, tuple, InvalidBuffer);
 
 	/* Clear local cache so that we don't think we have cached numbers */
 	/* Note that we do not change the currval() state */
@@ -340,18 +340,21 @@ ResetSequence(Oid seq_relid)
  * Initialize a sequence's relation with the specified tuple as content
  */
 static void
-fill_seq_with_data(Relation rel, HeapTuple tuple)
+fill_seq_with_data(Relation rel, HeapTuple tuple, Buffer buf)
 {
-	Buffer		buf;
 	Page		page;
 	sequence_magic *sm;
 	OffsetNumber offnum;
+	bool lockBuffer = false;
 
 	/* Initialize first page of relation with special magic number */
 
-	buf = ReadBuffer(rel, P_NEW);
-	Assert(BufferGetBlockNumber(buf) == 0);
-
+	if (buf == InvalidBuffer)
+	{
+		buf = ReadBuffer(rel, P_NEW);
+		Assert(BufferGetBlockNumber(buf) == 0);
+		lockBuffer = true;
+	}
 	page = BufferGetPage(buf);
 
 	PageInit(page, BufferGetPageSize(buf), sizeof(sequence_magic));
@@ -360,7 +363,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	/* Now insert sequence tuple */
 
-	LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
+	if (lockBuffer)
+		LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
 
 	/*
 	 * Since VACUUM does not process sequences, we have to force the tuple to
@@ -410,7 +414,8 @@ fill_seq_with_data(Relation rel, HeapTuple tuple)
 
 	END_CRIT_SECTION();
 
-	UnlockReleaseBuffer(buf);
+	if (lockBuffer)
+		UnlockReleaseBuffer(buf);
 }
 
 /*
@@ -502,7 +507,7 @@ AlterSequence(ParseState *pstate, AlterSeqStmt *stmt)
 		/*
 		 * Insert the modified tuple into the new storage file.
 		 */
-		fill_seq_with_data(seqrel, newdatatuple);
+		fill_seq_with_data(seqrel, newdatatuple, InvalidBuffer);
 	}
 
 	/* process OWNED BY if given */
@@ -1178,6 +1183,17 @@ read_seq_tuple(Relation rel, Buffer *buf, HeapTuple seqdatatuple)
 	LockBuffer(*buf, BUFFER_LOCK_EXCLUSIVE);
 
 	page = BufferGetPage(*buf);
+	if (GlobalTempRelationPageIsNotInitialized(rel, page))
+	{
+		/* Initialize sequence for global temporary tables */
+		Datum		value[SEQ_COL_LASTCOL] = {0};
+		bool		null[SEQ_COL_LASTCOL] = {false};
+		HeapTuple tuple;
+		value[SEQ_COL_LASTVAL-1] = Int64GetDatumFast(1); /* start sequence with 1 */
+		tuple = heap_form_tuple(RelationGetDescr(rel), value, null);
+		fill_seq_with_data(rel, tuple, *buf);
+	}
+
 	sm = (sequence_magic *) PageGetSpecialPointer(page);
 
 	if (sm->magic != SEQ_MAGIC)
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index f599393..1e4a52e 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -12,6 +12,9 @@
  *
  *-------------------------------------------------------------------------
  */
+#include <sys/stat.h>
+#include <unistd.h>
+
 #include "postgres.h"
 
 #include "access/attmap.h"
@@ -555,6 +558,23 @@ static List *GetParentedForeignKeyRefs(Relation partition);
 static void ATDetachCheckNoForeignKeyRefs(Relation partition);
 
 
+static bool
+has_oncommit_option(List *options)
+{
+	ListCell   *listptr;
+
+	foreach(listptr, options)
+	{
+		DefElem    *def = (DefElem *) lfirst(listptr);
+
+		if (pg_strcasecmp(def->defname, "on_commit_delete_rows") == 0)
+			return true;
+	}
+
+	return false;
+}
+
+
 /* ----------------------------------------------------------------
  *		DefineRelation
  *				Creates a new relation.
@@ -598,6 +618,7 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 	LOCKMODE	parentLockmode;
 	const char *accessMethod = NULL;
 	Oid			accessMethodId = InvalidOid;
+	bool		has_oncommit_clause = false;
 
 	/*
 	 * Truncate relname to appropriate length (probably a waste of time, as
@@ -609,7 +630,7 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 	 * Check consistency of arguments
 	 */
 	if (stmt->oncommit != ONCOMMIT_NOOP
-		&& stmt->relation->relpersistence != RELPERSISTENCE_TEMP)
+		&& !IsLocalRelpersistence(stmt->relation->relpersistence))
 		ereport(ERROR,
 				(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 				 errmsg("ON COMMIT can only be used on temporary tables")));
@@ -635,17 +656,6 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 		RangeVarGetAndCheckCreationNamespace(stmt->relation, NoLock, NULL);
 
 	/*
-	 * Security check: disallow creating temp tables from security-restricted
-	 * code.  This is needed because calling code might not expect untrusted
-	 * tables to appear in pg_temp at the front of its search path.
-	 */
-	if (stmt->relation->relpersistence == RELPERSISTENCE_TEMP
-		&& InSecurityRestrictedOperation())
-		ereport(ERROR,
-				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
-				 errmsg("cannot create temporary table within security-restricted operation")));
-
-	/*
 	 * Determine the lockmode to use when scanning parents.  A self-exclusive
 	 * lock is needed here.
 	 *
@@ -740,6 +750,38 @@ DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
 	/*
 	 * Parse and validate reloptions, if any.
 	 */
+	/* global temp table */
+	has_oncommit_clause = has_oncommit_option(stmt->options);
+	if (stmt->relation->relpersistence == RELPERSISTENCE_SESSION)
+	{
+		if (has_oncommit_clause)
+		{
+			if (stmt->oncommit != ONCOMMIT_NOOP)
+				elog(ERROR, "can not defeine global temp table with on commit and with clause at same time");
+		}
+		else if (stmt->oncommit != ONCOMMIT_NOOP)
+		{
+			DefElem *opt = makeNode(DefElem);
+
+			opt->type = T_DefElem;
+			opt->defnamespace = NULL;
+			opt->defname = "on_commit_delete_rows";
+			opt->defaction = DEFELEM_UNSPEC;
+
+			/* use reloptions to remember on commit clause */
+			if (stmt->oncommit == ONCOMMIT_DELETE_ROWS)
+				opt->arg  = (Node *)makeString("true");
+			else if (stmt->oncommit == ONCOMMIT_PRESERVE_ROWS)
+				opt->arg  = (Node *)makeString("false");
+			else
+				elog(ERROR, "global temp table not support on commit drop clause");
+
+			stmt->options = lappend(stmt->options, opt);
+		}
+	}
+	else if (has_oncommit_clause)
+		elog(ERROR, "regular table cannot specifie on_commit_delete_rows");
+
 	reloptions = transformRelOptions((Datum) 0, stmt->options, NULL, validnsps,
 									 true, false);
 
@@ -1824,7 +1866,8 @@ ExecuteTruncateGuts(List *explicit_rels, List *relids, List *relids_logged,
 		 * table or the current physical file to be thrown away anyway.
 		 */
 		if (rel->rd_createSubid == mySubid ||
-			rel->rd_newRelfilenodeSubid == mySubid)
+			rel->rd_newRelfilenodeSubid == mySubid ||
+			rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
 		{
 			/* Immediate, non-rollbackable truncation is OK */
 			heap_truncate_one_rel(rel);
@@ -3511,6 +3554,26 @@ AlterTableLookupRelation(AlterTableStmt *stmt, LOCKMODE lockmode)
 									(void *) stmt);
 }
 
+
+static bool
+CheckGlobalTempTableNotInUse(Relation rel)
+{
+	int id;
+	for (id = 1; id <= MaxBackends; id++)
+	{
+		if (id != MyBackendId)
+		{
+			struct stat fst;
+			char* path = relpathbackend(rel->rd_node, id, MAIN_FORKNUM);
+			int rc = stat(path, &fst);
+			pfree(path);
+			if (rc == 0 && fst.st_size != 0)
+				return false;
+		}
+	}
+	return true;
+}
+
 /*
  * AlterTable
  *		Execute ALTER TABLE, which can be a list of subcommands
@@ -3568,6 +3631,9 @@ AlterTable(AlterTableStmt *stmt, LOCKMODE lockmode,
 	rel = relation_open(context->relid, NoLock);
 
 	CheckTableNotInUse(rel, "ALTER TABLE");
+	if (rel->rd_rel->relpersistence == RELPERSISTENCE_SESSION
+		&& !CheckGlobalTempTableNotInUse(rel))
+		elog(ERROR, "Global temp table used by active backends can not be altered");
 
 	ATController(stmt, rel, stmt->cmds, stmt->relation->inh, lockmode, context);
 }
@@ -8169,6 +8235,12 @@ ATAddForeignKeyConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
 						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
 						 errmsg("constraints on unlogged tables may reference only permanent or unlogged tables")));
 			break;
+		case RELPERSISTENCE_SESSION:
+			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_SESSION)
+				ereport(ERROR,
+						(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+						 errmsg("constraints on session tables may reference only session tables")));
+			break;
 		case RELPERSISTENCE_TEMP:
 			if (pkrel->rd_rel->relpersistence != RELPERSISTENCE_TEMP)
 				ereport(ERROR,
@@ -14629,6 +14701,13 @@ ATPrepChangePersistence(Relation rel, bool toLogged)
 							RelationGetRelationName(rel)),
 					 errtable(rel)));
 			break;
+		case RELPERSISTENCE_SESSION:
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
+					 errmsg("cannot change logged status of session table \"%s\"",
+							RelationGetRelationName(rel)),
+					 errtable(rel)));
+			break;
 		case RELPERSISTENCE_PERMANENT:
 			if (toLogged)
 				/* nothing to do */
@@ -15116,14 +15195,7 @@ PreCommit_on_commit_actions(void)
 				/* Do nothing (there shouldn't be such entries, actually) */
 				break;
 			case ONCOMMIT_DELETE_ROWS:
-
-				/*
-				 * If this transaction hasn't accessed any temporary
-				 * relations, we can skip truncating ON COMMIT DELETE ROWS
-				 * tables, as they must still be empty.
-				 */
-				if ((MyXactFlags & XACT_FLAGS_ACCESSEDTEMPNAMESPACE))
-					oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
+				oids_to_truncate = lappend_oid(oids_to_truncate, oc->relid);
 				break;
 			case ONCOMMIT_DROP:
 				oids_to_drop = lappend_oid(oids_to_drop, oc->relid);
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 59d1a31..fe3283a 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -361,7 +361,14 @@ ExecInsert(ModifyTableState *mtstate,
 	 */
 	resultRelInfo = estate->es_result_relation_info;
 	resultRelationDesc = resultRelInfo->ri_RelationDesc;
-
+	if (resultRelationDesc->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
+	{
+		int i;
+		for (i = 0; i < resultRelInfo->ri_NumIndices; i++)
+		{
+			InitGTTIndexes(resultRelInfo->ri_IndexRelationDescs[i]);
+		}
+	}
 	/*
 	 * BEFORE ROW INSERT Triggers.
 	 *
diff --git a/src/backend/optimizer/path/allpaths.c b/src/backend/optimizer/path/allpaths.c
index 8286d9c..7a12635 100644
--- a/src/backend/optimizer/path/allpaths.c
+++ b/src/backend/optimizer/path/allpaths.c
@@ -48,6 +48,7 @@
 #include "partitioning/partprune.h"
 #include "rewrite/rewriteManip.h"
 #include "utils/lsyscache.h"
+#include "utils/rel.h"
 
 
 /* results of subquery_is_pushdown_safe */
@@ -618,7 +619,7 @@ set_rel_consider_parallel(PlannerInfo *root, RelOptInfo *rel,
 			 * the rest of the necessary infrastructure right now anyway.  So
 			 * for now, bail out if we see a temporary table.
 			 */
-			if (get_rel_persistence(rte->relid) == RELPERSISTENCE_TEMP)
+			if (IsLocalRelpersistence(get_rel_persistence(rte->relid)))
 				return;
 
 			/*
diff --git a/src/backend/optimizer/plan/planner.c b/src/backend/optimizer/plan/planner.c
index d6f2153..fd4e713 100644
--- a/src/backend/optimizer/plan/planner.c
+++ b/src/backend/optimizer/plan/planner.c
@@ -6312,7 +6312,7 @@ plan_create_index_workers(Oid tableOid, Oid indexOid)
 	 * Furthermore, any index predicate or index expressions must be parallel
 	 * safe.
 	 */
-	if (heap->rd_rel->relpersistence == RELPERSISTENCE_TEMP ||
+	if (RelationHasSessionScope(heap) ||
 		!is_parallel_safe(root, (Node *) RelationGetIndexExpressions(index)) ||
 		!is_parallel_safe(root, (Node *) RelationGetIndexPredicate(index)))
 	{
diff --git a/src/backend/optimizer/util/plancat.c b/src/backend/optimizer/util/plancat.c
index d82fc5a..619ed96 100644
--- a/src/backend/optimizer/util/plancat.c
+++ b/src/backend/optimizer/util/plancat.c
@@ -80,6 +80,15 @@ static void set_baserel_partition_key_exprs(Relation relation,
 static void set_baserel_partition_constraint(Relation relation,
 											 RelOptInfo *rel);
 
+static bool
+is_index_valid(Relation index)
+{
+	if (!index->rd_index->indisvalid)
+		return false;
+	if (index->rd_rel->relpersistence == RELPERSISTENCE_SESSION)
+		InitGTTIndexes(index);
+	return true;
+}
 
 /*
  * get_relation_info -
@@ -205,7 +214,7 @@ get_relation_info(PlannerInfo *root, Oid relationObjectId, bool inhparent,
 			 * still needs to insert into "invalid" indexes, if they're marked
 			 * indisready.
 			 */
-			if (!index->indisvalid)
+			if (!is_index_valid(indexRelation))
 			{
 				index_close(indexRelation, NoLock);
 				continue;
@@ -704,7 +713,7 @@ infer_arbiter_indexes(PlannerInfo *root)
 		idxRel = index_open(indexoid, rte->rellockmode);
 		idxForm = idxRel->rd_index;
 
-		if (!idxForm->indisvalid)
+		if (!is_index_valid(idxRel))
 			goto next;
 
 		/*
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index 1b0edf5..787de83 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -3288,20 +3288,11 @@ OptTemp:	TEMPORARY					{ $$ = RELPERSISTENCE_TEMP; }
 			| TEMP						{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMPORARY			{ $$ = RELPERSISTENCE_TEMP; }
 			| LOCAL TEMP				{ $$ = RELPERSISTENCE_TEMP; }
-			| GLOBAL TEMPORARY
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
-			| GLOBAL TEMP
-				{
-					ereport(WARNING,
-							(errmsg("GLOBAL is deprecated in temporary table creation"),
-							 parser_errposition(@1)));
-					$$ = RELPERSISTENCE_TEMP;
-				}
+			| GLOBAL TEMPORARY          { $$ = RELPERSISTENCE_SESSION; }
+			| GLOBAL TEMP               { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION                   { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMPORARY         { $$ = RELPERSISTENCE_SESSION; }
+			| SESSION TEMP              { $$ = RELPERSISTENCE_SESSION; }
 			| UNLOGGED					{ $$ = RELPERSISTENCE_UNLOGGED; }
 			| /*EMPTY*/					{ $$ = RELPERSISTENCE_PERMANENT; }
 		;
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index ee2d2b5..e7f3a20 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -438,6 +438,14 @@ generateSerialExtraStmts(CreateStmtContext *cxt, ColumnDef *column,
 	seqstmt->options = seqoptions;
 
 	/*
+	 * Why we should not always use persistence of parent table?
+	 * Although it is prohibited to have unlogged sequences,
+	 * unlogged tables with SERIAL fields are accepted!
+	 */
+	if (cxt->relation->relpersistence != RELPERSISTENCE_UNLOGGED)
+		seqstmt->sequence->relpersistence = cxt->relation->relpersistence;
+
+	/*
 	 * If a sequence data type was specified, add it to the options.  Prepend
 	 * to the list rather than append; in case a user supplied their own AS
 	 * clause, the "redundant options" error will point to their occurrence,
diff --git a/src/backend/postmaster/autovacuum.c b/src/backend/postmaster/autovacuum.c
index 6d1f28c..4074344 100644
--- a/src/backend/postmaster/autovacuum.c
+++ b/src/backend/postmaster/autovacuum.c
@@ -2152,7 +2152,7 @@ do_autovacuum(void)
 		/*
 		 * We cannot safely process other backends' temp tables, so skip 'em.
 		 */
-		if (classForm->relpersistence == RELPERSISTENCE_TEMP)
+		if (IsLocalRelpersistence(classForm->relpersistence))
 			continue;
 
 		relid = classForm->oid;
diff --git a/src/backend/storage/buffer/bufmgr.c b/src/backend/storage/buffer/bufmgr.c
index aba3960..2d88cc9 100644
--- a/src/backend/storage/buffer/bufmgr.c
+++ b/src/backend/storage/buffer/bufmgr.c
@@ -33,9 +33,11 @@
 #include <sys/file.h>
 #include <unistd.h>
 
+#include "access/amapi.h"
 #include "access/tableam.h"
 #include "access/xlog.h"
 #include "catalog/catalog.h"
+#include "catalog/index.h"
 #include "catalog/storage.h"
 #include "executor/instrument.h"
 #include "lib/binaryheap.h"
@@ -429,7 +431,7 @@ ForgetPrivateRefCountEntry(PrivateRefCountEntry *ref)
 )
 
 
-static Buffer ReadBuffer_common(SMgrRelation reln, char relpersistence,
+static Buffer ReadBuffer_common(SMgrRelation reln, char relpersistence, char relkind,
 								ForkNumber forkNum, BlockNumber blockNum,
 								ReadBufferMode mode, BufferAccessStrategy strategy,
 								bool *hit);
@@ -663,7 +665,7 @@ ReadBufferExtended(Relation reln, ForkNumber forkNum, BlockNumber blockNum,
 	 * miss.
 	 */
 	pgstat_count_buffer_read(reln);
-	buf = ReadBuffer_common(reln->rd_smgr, reln->rd_rel->relpersistence,
+	buf = ReadBuffer_common(reln->rd_smgr, reln->rd_rel->relpersistence, reln->rd_rel->relkind,
 							forkNum, blockNum, mode, strategy, &hit);
 	if (hit)
 		pgstat_count_buffer_hit(reln);
@@ -691,7 +693,7 @@ ReadBufferWithoutRelcache(RelFileNode rnode, ForkNumber forkNum,
 
 	Assert(InRecovery);
 
-	return ReadBuffer_common(smgr, RELPERSISTENCE_PERMANENT, forkNum, blockNum,
+	return ReadBuffer_common(smgr, RELPERSISTENCE_PERMANENT, RELKIND_RELATION, forkNum, blockNum,
 							 mode, strategy, &hit);
 }
 
@@ -702,7 +704,7 @@ ReadBufferWithoutRelcache(RelFileNode rnode, ForkNumber forkNum,
  * *hit is set to true if the request was satisfied from shared buffer cache.
  */
 static Buffer
-ReadBuffer_common(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
+ReadBuffer_common(SMgrRelation smgr, char relpersistence, char relkind, ForkNumber forkNum,
 				  BlockNumber blockNum, ReadBufferMode mode,
 				  BufferAccessStrategy strategy, bool *hit)
 {
@@ -895,7 +897,8 @@ ReadBuffer_common(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
 			if (track_io_timing)
 				INSTR_TIME_SET_CURRENT(io_start);
 
-			smgrread(smgr, forkNum, blockNum, (char *) bufBlock);
+			smgrread(smgr, forkNum, blockNum, (char *) bufBlock,
+					 relkind == RELKIND_INDEX);
 
 			if (track_io_timing)
 			{
@@ -2943,7 +2946,7 @@ DropRelFileNodeBuffers(RelFileNodeBackend rnode, ForkNumber *forkNum,
 	/* If it's a local relation, it's localbuf.c's problem. */
 	if (RelFileNodeBackendIsTemp(rnode))
 	{
-		if (rnode.backend == MyBackendId)
+		if (GetRelationBackendId(rnode.backend) == MyBackendId)
 		{
 			for (j = 0; j < nforks; j++)
 				DropRelFileNodeLocalBuffers(rnode.node, forkNum[j],
@@ -4423,3 +4426,19 @@ TestForOldSnapshot_impl(Snapshot snapshot, Relation relation)
 				(errcode(ERRCODE_SNAPSHOT_TOO_OLD),
 				 errmsg("snapshot too old")));
 }
+
+void InitGTTIndexes(Relation index)
+{
+	Buffer metapage = ReadBuffer(index, 0);
+	bool isNew = PageIsNew(BufferGetPage(metapage));
+	Assert(index->rd_rel->relpersistence == RELPERSISTENCE_SESSION);
+	ReleaseBuffer(metapage);
+	if (isNew)
+	{
+		Relation heap;
+		DropRelFileNodeAllLocalBuffers(index->rd_smgr->smgr_rnode.node);
+		heap = RelationIdGetRelation(index->rd_index->indrelid);
+		index->rd_indam->ambuild(heap, index, BuildIndexInfo(index));
+		RelationClose(heap);
+	}
+}
diff --git a/src/backend/storage/smgr/md.c b/src/backend/storage/smgr/md.c
index c5b771c..4400b21 100644
--- a/src/backend/storage/smgr/md.c
+++ b/src/backend/storage/smgr/md.c
@@ -27,12 +27,14 @@
 
 #include "access/xlog.h"
 #include "access/xlogutils.h"
+#include "commands/tablecmds.h"
 #include "commands/tablespace.h"
 #include "miscadmin.h"
 #include "pg_trace.h"
 #include "pgstat.h"
 #include "postmaster/bgwriter.h"
 #include "storage/bufmgr.h"
+#include "storage/ipc.h"
 #include "storage/fd.h"
 #include "storage/md.h"
 #include "storage/relfilenode.h"
@@ -40,6 +42,7 @@
 #include "storage/sync.h"
 #include "utils/hsearch.h"
 #include "utils/memutils.h"
+#include "utils/rel.h"
 
 /*
  *	The magnetic disk storage manager keeps track of open file
@@ -87,6 +90,19 @@ typedef struct _MdfdVec
 
 static MemoryContext MdCxt;		/* context for all MdfdVec objects */
 
+/*
+ * Structure used to collect information created by this backend.
+ * Data of this related should be deleted on backend exit.
+ */
+typedef struct SessionRelation
+{
+	RelFileNodeBackend rnode;
+	ForkNumber forknum;
+	struct SessionRelation* next;
+} SessionRelation;
+
+
+static SessionRelation* SessionRelations;
 
 /* Populate a file tag describing an md.c segment file. */
 #define INIT_MD_FILETAG(a,xx_rnode,xx_forknum,xx_segno) \
@@ -152,6 +168,60 @@ mdinit(void)
 								  ALLOCSET_DEFAULT_SIZES);
 }
 
+
+/*
+ * Delete all data of session relations and remove their pages from shared buffers.
+ * This function is called on backend exit.
+ */
+static void
+TruncateSessionRelations(int code, Datum arg)
+{
+	SessionRelation* rel;
+	for (rel = SessionRelations; rel != NULL; rel = rel->next)
+	{
+		/* Delete relation files */
+		mdunlink(rel->rnode, rel->forknum, false);
+	}
+}
+
+/*
+ * Maintain information about session relations accessed by this backend.
+ * This list is needed to perform cleanup on backend exit.
+ * Session relation is linked in this list when this relation is created or opened and file doesn't exist.
+ * Such procedure guarantee that each relation is linked into list only once.
+ */
+static void
+RegisterSessionRelation(SMgrRelation reln, ForkNumber forknum)
+{
+	SessionRelation* rel = (SessionRelation*)MemoryContextAlloc(TopMemoryContext, sizeof(SessionRelation));
+
+	/*
+	 * Perform session relation cleanup on backend exit. We are using shared memory hook, because
+	 * cleanup should be performed before backend is disconnected from shared memory.
+	 */
+	if (SessionRelations == NULL)
+		on_shmem_exit(TruncateSessionRelations, 0);
+
+	rel->rnode = reln->smgr_rnode;
+	rel->forknum = forknum;
+	rel->next = SessionRelations;
+	SessionRelations = rel;
+}
+
+static void
+RegisterOnCommitAction(SMgrRelation reln, ForkNumber forknum)
+{
+	if (reln->smgr_owner && forknum == MAIN_FORKNUM)
+	{
+		Relation rel = (Relation)((char*)reln->smgr_owner - offsetof(RelationData, rd_smgr));
+		if (rel->rd_options
+			&& ((StdRdOptions *)rel->rd_options)->on_commit_delete_rows)
+		{
+			register_on_commit_action(rel->rd_id, ONCOMMIT_DELETE_ROWS);
+		}
+	}
+}
+
 /*
  *	mdexists() -- Does the physical file exist?
  *
@@ -218,6 +288,8 @@ mdcreate(SMgrRelation reln, ForkNumber forkNum, bool isRedo)
 					 errmsg("could not create file \"%s\": %m", path)));
 		}
 	}
+	if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		RegisterSessionRelation(reln, forkNum);
 
 	pfree(path);
 
@@ -465,6 +537,21 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 
 	if (fd < 0)
 	{
+		/*
+		 * In case of session relation access, there may be no yet files of this relation for this backend.
+		 * If so, then create file and register session relation for truncation on backend exit.
+		 */
+		if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
+			fd = PathNameOpenFile(path, O_RDWR | PG_BINARY | O_CREAT);
+			if (fd >= 0)
+			{
+				RegisterSessionRelation(reln, forknum);
+				if (!(behavior & EXTENSION_RETURN_NULL))
+					RegisterOnCommitAction(reln, forknum);
+				goto NewSegment;
+			}
+		}
 		if ((behavior & EXTENSION_RETURN_NULL) &&
 			FILE_POSSIBLY_DELETED(errno))
 		{
@@ -476,6 +563,7 @@ mdopenfork(SMgrRelation reln, ForkNumber forknum, int behavior)
 				 errmsg("could not open file \"%s\": %m", path)));
 	}
 
+  NewSegment:
 	pfree(path);
 
 	_fdvec_resize(reln, forknum, 1);
@@ -599,7 +687,7 @@ mdwriteback(SMgrRelation reln, ForkNumber forknum,
  */
 void
 mdread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
-	   char *buffer)
+	   char *buffer, bool skipInit)
 {
 	off_t		seekpos;
 	int			nbytes;
@@ -644,8 +732,13 @@ mdread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
 		 * complaining.  This allows, for example, the case of trying to
 		 * update a block that was later truncated away.
 		 */
-		if (zero_damaged_pages || InRecovery)
+		if (zero_damaged_pages || InRecovery || RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode))
+		{
 			MemSet(buffer, 0, BLCKSZ);
+			/* In case of session relation we need to write zero page to provide correct result of subsequent mdnblocks */
+			if (RelFileNodeBackendIsGlobalTemp(reln->smgr_rnode) && !skipInit)
+				mdwrite(reln, forknum, blocknum, buffer, true);
+		}
 		else
 			ereport(ERROR,
 					(errcode(ERRCODE_DATA_CORRUPTED),
@@ -735,7 +828,8 @@ mdnblocks(SMgrRelation reln, ForkNumber forknum)
 	BlockNumber segno = 0;
 
 	/* mdopen has opened the first segment */
-	Assert(reln->md_num_open_segs[forknum] > 0);
+	if (reln->md_num_open_segs[forknum] == 0)
+		return 0;
 
 	/*
 	 * Start from the last open segments, to avoid redundant seeks.  We have
diff --git a/src/backend/storage/smgr/smgr.c b/src/backend/storage/smgr/smgr.c
index 360b5bf..a7b491b 100644
--- a/src/backend/storage/smgr/smgr.c
+++ b/src/backend/storage/smgr/smgr.c
@@ -52,7 +52,7 @@ typedef struct f_smgr
 	void		(*smgr_prefetch) (SMgrRelation reln, ForkNumber forknum,
 								  BlockNumber blocknum);
 	void		(*smgr_read) (SMgrRelation reln, ForkNumber forknum,
-							  BlockNumber blocknum, char *buffer);
+							  BlockNumber blocknum, char *buffer, bool skipInit);
 	void		(*smgr_write) (SMgrRelation reln, ForkNumber forknum,
 							   BlockNumber blocknum, char *buffer, bool skipFsync);
 	void		(*smgr_writeback) (SMgrRelation reln, ForkNumber forknum,
@@ -506,9 +506,9 @@ smgrprefetch(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum)
  */
 void
 smgrread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
-		 char *buffer)
+		 char *buffer, bool skipInit)
 {
-	smgrsw[reln->smgr_which].smgr_read(reln, forknum, blocknum, buffer);
+	smgrsw[reln->smgr_which].smgr_read(reln, forknum, blocknum, buffer, skipInit);
 }
 
 /*
diff --git a/src/backend/utils/adt/dbsize.c b/src/backend/utils/adt/dbsize.c
index 8406644..0416549 100644
--- a/src/backend/utils/adt/dbsize.c
+++ b/src/backend/utils/adt/dbsize.c
@@ -994,6 +994,9 @@ pg_relation_filepath(PG_FUNCTION_ARGS)
 	/* Determine owning backend. */
 	switch (relform->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			backend = BackendIdForSessionRelations();
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			backend = InvalidBackendId;
diff --git a/src/backend/utils/cache/catcache.c b/src/backend/utils/cache/catcache.c
index 64776e3..4996d88 100644
--- a/src/backend/utils/cache/catcache.c
+++ b/src/backend/utils/cache/catcache.c
@@ -1191,6 +1191,110 @@ SearchCatCache4(CatCache *cache,
 	return SearchCatCacheInternal(cache, 4, v1, v2, v3, v4);
 }
 
+
+void InsertCatCache(CatCache *cache,
+					Datum v1, Datum v2, Datum v3, Datum v4,
+					HeapTuple tuple)
+{
+	Datum		arguments[CATCACHE_MAXKEYS];
+	uint32		hashValue;
+	Index		hashIndex;
+	CatCTup    *ct;
+	dlist_iter	iter;
+	dlist_head *bucket;
+	int         nkeys = cache->cc_nkeys;
+	MemoryContext oldcxt;
+
+	/*
+	 * one-time startup overhead for each cache
+	 */
+	if (unlikely(cache->cc_tupdesc == NULL))
+		CatalogCacheInitializeCache(cache);
+
+	/* Initialize local parameter array */
+	arguments[0] = v1;
+	arguments[1] = v2;
+	arguments[2] = v3;
+	arguments[3] = v4;
+	/*
+	 * find the hash bucket in which to look for the tuple
+	 */
+	hashValue = CatalogCacheComputeHashValue(cache, nkeys, v1, v2, v3, v4);
+	hashIndex = HASH_INDEX(hashValue, cache->cc_nbuckets);
+
+	/*
+	 * scan the hash bucket until we find a match or exhaust our tuples
+	 *
+	 * Note: it's okay to use dlist_foreach here, even though we modify the
+	 * dlist within the loop, because we don't continue the loop afterwards.
+	 */
+	bucket = &cache->cc_bucket[hashIndex];
+	dlist_foreach(iter, bucket)
+	{
+		ct = dlist_container(CatCTup, cache_elem, iter.cur);
+
+		if (ct->dead)
+			continue;			/* ignore dead entries */
+
+		if (ct->hash_value != hashValue)
+			continue;			/* quickly skip entry if wrong hash val */
+
+		if (!CatalogCacheCompareTuple(cache, nkeys, ct->keys, arguments))
+			continue;
+
+		/*
+		 * If it's a positive entry, bump its refcount and return it. If it's
+		 * negative, we can report failure to the caller.
+		 */
+		if (ct->tuple.t_len == tuple->t_len)
+		{
+			memcpy((char *) ct->tuple.t_data,
+				   (const char *) tuple->t_data,
+				   tuple->t_len);
+			return;
+		}
+		dlist_delete(&ct->cache_elem);
+		pfree(ct);
+		cache->cc_ntup -= 1;
+		CacheHdr->ch_ntup -= 1;
+		break;
+	}
+	/* Allocate memory for CatCTup and the cached tuple in one go */
+	oldcxt = MemoryContextSwitchTo(CacheMemoryContext);
+
+	ct = (CatCTup *) palloc(sizeof(CatCTup) +
+							MAXIMUM_ALIGNOF + tuple->t_len);
+	ct->tuple.t_len = tuple->t_len;
+	ct->tuple.t_self = tuple->t_self;
+	ct->tuple.t_tableOid = tuple->t_tableOid;
+	ct->tuple.t_data = (HeapTupleHeader)
+		MAXALIGN(((char *) ct) + sizeof(CatCTup));
+	/* copy tuple contents */
+	memcpy((char *) ct->tuple.t_data,
+		   (const char *) tuple->t_data,
+		   tuple->t_len);
+	ct->ct_magic = CT_MAGIC;
+	ct->my_cache = cache;
+	ct->c_list = NULL;
+	ct->refcount = 1;			/* pinned*/
+	ct->dead = false;
+	ct->negative = false;
+	ct->hash_value = hashValue;
+	dlist_push_head(&cache->cc_bucket[hashIndex], &ct->cache_elem);
+	memcpy(ct->keys, arguments, nkeys*sizeof(Datum));
+
+	cache->cc_ntup++;
+	CacheHdr->ch_ntup++;
+	MemoryContextSwitchTo(oldcxt);
+
+	/*
+	 * If the hash table has become too full, enlarge the buckets array. Quite
+	 * arbitrarily, we enlarge when fill factor > 2.
+	 */
+	if (cache->cc_ntup > cache->cc_nbuckets * 2)
+		RehashCatCache(cache);
+}
+
 /*
  * Work-horse for SearchCatCache/SearchCatCacheN.
  */
diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c
index df025a5..dd0b1ff 100644
--- a/src/backend/utils/cache/relcache.c
+++ b/src/backend/utils/cache/relcache.c
@@ -1092,6 +1092,10 @@ RelationBuildDesc(Oid targetRelId, bool insertIt)
 	relation->rd_newRelfilenodeSubid = InvalidSubTransactionId;
 	switch (relation->rd_rel->relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			relation->rd_backend = BackendIdForSessionRelations();
+			relation->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			relation->rd_backend = InvalidBackendId;
@@ -3303,6 +3307,10 @@ RelationBuildLocalRelation(const char *relname,
 	rel->rd_rel->relpersistence = relpersistence;
 	switch (relpersistence)
 	{
+		case RELPERSISTENCE_SESSION:
+			rel->rd_backend = BackendIdForSessionRelations();
+			rel->rd_islocaltemp = false;
+			break;
 		case RELPERSISTENCE_UNLOGGED:
 		case RELPERSISTENCE_PERMANENT:
 			rel->rd_backend = InvalidBackendId;
diff --git a/src/backend/utils/cache/syscache.c b/src/backend/utils/cache/syscache.c
index 53d9ddf..f263b83 100644
--- a/src/backend/utils/cache/syscache.c
+++ b/src/backend/utils/cache/syscache.c
@@ -1156,6 +1156,16 @@ SearchSysCache4(int cacheId,
 	return SearchCatCache4(SysCache[cacheId], key1, key2, key3, key4);
 }
 
+void
+InsertSysCache(int cacheId,
+			   Datum key1, Datum key2, Datum key3, Datum key4,
+			   HeapTuple value)
+{
+	Assert(cacheId >= 0 && cacheId < SysCacheSize &&
+		   PointerIsValid(SysCache[cacheId]));
+	InsertCatCache(SysCache[cacheId], key1, key2, key3, key4, value);
+}
+
 /*
  * ReleaseSysCache
  *		Release previously grabbed reference count on a tuple
diff --git a/src/backend/utils/fmgr/funcapi.c b/src/backend/utils/fmgr/funcapi.c
index b7eee3d..afe22b2 100644
--- a/src/backend/utils/fmgr/funcapi.c
+++ b/src/backend/utils/fmgr/funcapi.c
@@ -18,6 +18,7 @@
 #include "catalog/namespace.h"
 #include "catalog/pg_proc.h"
 #include "catalog/pg_type.h"
+#include "catalog/pg_statistic_d.h"
 #include "funcapi.h"
 #include "nodes/nodeFuncs.h"
 #include "parser/parse_coerce.h"
@@ -30,6 +31,13 @@
 #include "utils/syscache.h"
 #include "utils/typcache.h"
 
+/*
+ * TODO: find less ugly way to declare core function returning pg_statistics.
+ * OID of pg_gtt_statistic_for_relation. This function should be handled in special way because it returns set of pg_statistics
+ * which contains attributes of anyarray type. Type of attributes can not be deduced from input parameters and
+ * it prevents using tuple descriptor in this case.
+ */
+#define GttStatisticFunctionId 3434
 
 static void shutdown_MultiFuncCall(Datum arg);
 static TypeFuncClass internal_get_result_type(Oid funcid,
@@ -341,7 +349,8 @@ internal_get_result_type(Oid funcid,
 
 		if (resolve_polymorphic_tupdesc(tupdesc,
 										&procform->proargtypes,
-										call_expr))
+										call_expr) ||
+			funcid == GttStatisticFunctionId)
 		{
 			if (tupdesc->tdtypeid == RECORDOID &&
 				tupdesc->tdtypmod < 0)
diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
index ec3e2c6..4c15822 100644
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -15635,8 +15635,8 @@ dumpTableSchema(Archive *fout, TableInfo *tbinfo)
 											 tbinfo->dobj.catId.oid, false);
 
 		appendPQExpBuffer(q, "CREATE %s%s %s",
-						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ?
-						  "UNLOGGED " : "",
+						  tbinfo->relpersistence == RELPERSISTENCE_UNLOGGED ? "UNLOGGED "
+						  : tbinfo->relpersistence == RELPERSISTENCE_SESSION ? "SESSION " : "",
 						  reltypename,
 						  qualrelname);
 
diff --git a/src/common/relpath.c b/src/common/relpath.c
index ad733d1..be38d17 100644
--- a/src/common/relpath.c
+++ b/src/common/relpath.c
@@ -169,7 +169,18 @@ GetRelationPath(Oid dbNode, Oid spcNode, Oid relNode,
 		}
 		else
 		{
-			if (forkNumber != MAIN_FORKNUM)
+			/*
+			 * Session relations are distinguished from local temp relations by adding
+			 * SessionRelFirstBackendId offset to backendId.
+			 * These is no need to separate them at file system level, so just subtract SessionRelFirstBackendId
+			 * to avoid too long file names.
+			 * Segments of session relations have the same prefix (t%d_) as local temporary relations
+			 * to make it possible to cleanup them in the same way as local temporary relation files.
+			 */
+			 if (backendId >= SessionRelFirstBackendId)
+				 backendId -= SessionRelFirstBackendId;
+
+			 if (forkNumber != MAIN_FORKNUM)
 				path = psprintf("base/%u/t%d_%u_%s",
 								dbNode, backendId, relNode,
 								forkNames[forkNumber]);
diff --git a/src/include/catalog/pg_class.h b/src/include/catalog/pg_class.h
index a12fc1f..89c3645 100644
--- a/src/include/catalog/pg_class.h
+++ b/src/include/catalog/pg_class.h
@@ -165,6 +165,7 @@ typedef FormData_pg_class *Form_pg_class;
 #define		  RELPERSISTENCE_PERMANENT	'p' /* regular table */
 #define		  RELPERSISTENCE_UNLOGGED	'u' /* unlogged permanent table */
 #define		  RELPERSISTENCE_TEMP		't' /* temporary table */
+#define		  RELPERSISTENCE_SESSION	's' /* session table */
 
 /* default selection for replica identity (primary key or nothing) */
 #define		  REPLICA_IDENTITY_DEFAULT	'd'
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 2228256..6757491 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -5503,7 +5503,14 @@
   proname => 'pg_stat_get_xact_function_self_time', provolatile => 'v',
   proparallel => 'r', prorettype => 'float8', proargtypes => 'oid',
   prosrc => 'pg_stat_get_xact_function_self_time' },
-
+{ oid => '3434',
+  descr => 'show local statistics for global temp table',
+  proname => 'pg_gtt_statistic_for_relation', provolatile => 'v', proparallel => 'u',
+  prorettype => 'record', proretset => 't', prorows => '100', proargtypes => 'oid',
+  proallargtypes => '{oid,oid,int2,bool,float4,int4,float4,int2,int2,int2,int2,int2,oid,oid,oid,oid,oid,oid,oid,oid,oid,oid,_float4,_float4,_float4,_float4,_float4,anyarray,anyarray,anyarray,anyarray,anyarray}',
+  proargmodes => '{i,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o}',
+  proargnames => '{relid,starelid,staattnum,stainherit,stanullfrac,stawidth,stadistinct,stakind1,stakind2,stakind3,stakind4,stakind5,staop1,staop2,staop3,staop4,staop5,stacoll1,stacoll2,stacoll3,stacoll4,stacoll5,stanumbers1,stanumbers2,stanumbers3,stanumbers4,stanumbers5,stavalues1,stavalues2,stavalues3,stavalues4,stavalues5}',
+  prosrc => 'pg_gtt_statistic_for_relation' },
 { oid => '3788',
   descr => 'statistics: timestamp of the current statistics snapshot',
   proname => 'pg_stat_get_snapshot_timestamp', provolatile => 's',
diff --git a/src/include/storage/backendid.h b/src/include/storage/backendid.h
index 0c776a3..124fc3c 100644
--- a/src/include/storage/backendid.h
+++ b/src/include/storage/backendid.h
@@ -22,6 +22,13 @@ typedef int BackendId;			/* unique currently active backend identifier */
 
 #define InvalidBackendId		(-1)
 
+/*
+ * We need to distinguish local and global temporary relations by RelFileNodeBackend.
+ * The least invasive change is to add some special bias value to backend id (since 
+ * maximal number of backed is limited by MaxBackends).
+ */
+#define SessionRelFirstBackendId (0x40000000)
+
 extern PGDLLIMPORT BackendId MyBackendId;	/* backend id of this backend */
 
 /* backend id of our parallel session leader, or InvalidBackendId if none */
@@ -34,4 +41,12 @@ extern PGDLLIMPORT BackendId ParallelMasterBackendId;
 #define BackendIdForTempRelations() \
 	(ParallelMasterBackendId == InvalidBackendId ? MyBackendId : ParallelMasterBackendId)
 
+
+#define BackendIdForSessionRelations() \
+	(BackendIdForTempRelations() + SessionRelFirstBackendId)
+
+#define IsSessionRelationBackendId(id) ((id) >= SessionRelFirstBackendId)
+
+#define GetRelationBackendId(id) ((id) & ~SessionRelFirstBackendId)
+
 #endif							/* BACKENDID_H */
diff --git a/src/include/storage/bufmgr.h b/src/include/storage/bufmgr.h
index 73c7e9b..467134c 100644
--- a/src/include/storage/bufmgr.h
+++ b/src/include/storage/bufmgr.h
@@ -231,6 +231,7 @@ extern void TestForOldSnapshot_impl(Snapshot snapshot, Relation relation);
 extern BufferAccessStrategy GetAccessStrategy(BufferAccessStrategyType btype);
 extern void FreeAccessStrategy(BufferAccessStrategy strategy);
 
+extern void InitGTTIndexes(Relation rel);
 
 /* inline functions */
 
diff --git a/src/include/storage/bufpage.h b/src/include/storage/bufpage.h
index 3f88683..7ecef10 100644
--- a/src/include/storage/bufpage.h
+++ b/src/include/storage/bufpage.h
@@ -229,6 +229,13 @@ typedef PageHeaderData *PageHeader;
 #define PageIsNew(page) (((PageHeader) (page))->pd_upper == 0)
 
 /*
+ * Page of temporary relation is not initialized
+ */
+#define GlobalTempRelationPageIsNotInitialized(rel, page) \
+	((rel)->rd_rel->relpersistence == RELPERSISTENCE_SESSION && PageIsNew(page))
+
+
+/*
  * PageGetItemId
  *		Returns an item identifier of a page.
  */
diff --git a/src/include/storage/md.h b/src/include/storage/md.h
index ec7630c..5683883 100644
--- a/src/include/storage/md.h
+++ b/src/include/storage/md.h
@@ -31,7 +31,7 @@ extern void mdextend(SMgrRelation reln, ForkNumber forknum,
 extern void mdprefetch(SMgrRelation reln, ForkNumber forknum,
 					   BlockNumber blocknum);
 extern void mdread(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum,
-				   char *buffer);
+				   char *buffer, bool skipInit);
 extern void mdwrite(SMgrRelation reln, ForkNumber forknum,
 					BlockNumber blocknum, char *buffer, bool skipFsync);
 extern void mdwriteback(SMgrRelation reln, ForkNumber forknum,
diff --git a/src/include/storage/relfilenode.h b/src/include/storage/relfilenode.h
index 4de9fc1..c45040b 100644
--- a/src/include/storage/relfilenode.h
+++ b/src/include/storage/relfilenode.h
@@ -75,10 +75,25 @@ typedef struct RelFileNodeBackend
 	BackendId	backend;
 } RelFileNodeBackend;
 
+/*
+ * Check whether it is local or global temporary relation, which data belongs only to one backend.
+ */
 #define RelFileNodeBackendIsTemp(rnode) \
 	((rnode).backend != InvalidBackendId)
 
 /*
+ * Check whether it is global temporary relation which metadata is shared by all sessions,
+ * but data is private for the current session.
+ */
+#define RelFileNodeBackendIsGlobalTemp(rnode) IsSessionRelationBackendId((rnode).backend)
+
+/*
+ * Check whether it is local temporary relation which exists only in this backend.
+ */
+#define RelFileNodeBackendIsLocalTemp(rnode) \
+	(RelFileNodeBackendIsTemp(rnode) && !RelFileNodeBackendIsGlobalTemp(rnode))
+
+/*
  * Note: RelFileNodeEquals and RelFileNodeBackendEquals compare relNode first
  * since that is most likely to be different in two unequal RelFileNodes.  It
  * is probably redundant to compare spcNode if the other fields are found equal,
diff --git a/src/include/storage/smgr.h b/src/include/storage/smgr.h
index 2438221..a4a2da2 100644
--- a/src/include/storage/smgr.h
+++ b/src/include/storage/smgr.h
@@ -95,7 +95,7 @@ extern void smgrextend(SMgrRelation reln, ForkNumber forknum,
 extern void smgrprefetch(SMgrRelation reln, ForkNumber forknum,
 						 BlockNumber blocknum);
 extern void smgrread(SMgrRelation reln, ForkNumber forknum,
-					 BlockNumber blocknum, char *buffer);
+					 BlockNumber blocknum, char *buffer, bool skipInit);
 extern void smgrwrite(SMgrRelation reln, ForkNumber forknum,
 					  BlockNumber blocknum, char *buffer, bool skipFsync);
 extern void smgrwriteback(SMgrRelation reln, ForkNumber forknum,
diff --git a/src/include/utils/catcache.h b/src/include/utils/catcache.h
index f4aa316..365b02a 100644
--- a/src/include/utils/catcache.h
+++ b/src/include/utils/catcache.h
@@ -228,4 +228,8 @@ extern void PrepareToInvalidateCacheTuple(Relation relation,
 extern void PrintCatCacheLeakWarning(HeapTuple tuple);
 extern void PrintCatCacheListLeakWarning(CatCList *list);
 
+extern void InsertCatCache(CatCache *cache,
+						   Datum v1, Datum v2, Datum v3, Datum v4,
+						   HeapTuple tuple);
+
 #endif							/* CATCACHE_H */
diff --git a/src/include/utils/rel.h b/src/include/utils/rel.h
index 44ed04d..ae56427 100644
--- a/src/include/utils/rel.h
+++ b/src/include/utils/rel.h
@@ -277,6 +277,7 @@ typedef struct StdRdOptions
 	int			parallel_workers;	/* max number of parallel workers */
 	bool		vacuum_index_cleanup;	/* enables index vacuuming and cleanup */
 	bool		vacuum_truncate;	/* enables vacuum to truncate a relation */
+	bool		on_commit_delete_rows;	/* global temp table */
 } StdRdOptions;
 
 #define HEAP_MIN_FILLFACTOR			10
@@ -332,6 +333,18 @@ typedef struct StdRdOptions
 	((relation)->rd_options ? \
 	 ((StdRdOptions *) (relation)->rd_options)->parallel_workers : (defaultpw))
 
+/*
+ * Relation persistence is either TEMP either SESSION
+ */
+#define IsLocalRelpersistence(relpersistence) \
+	((relpersistence) == RELPERSISTENCE_TEMP || (relpersistence) == RELPERSISTENCE_SESSION)
+
+/*
+ * Relation is either global either local temp table
+ */
+#define RelationHasSessionScope(relation) \
+	IsLocalRelpersistence(((relation)->rd_rel->relpersistence))
+
 /* ViewOptions->check_option values */
 typedef enum ViewOptCheckOption
 {
@@ -340,6 +353,7 @@ typedef enum ViewOptCheckOption
 	VIEW_OPTION_CHECK_OPTION_CASCADED
 } ViewOptCheckOption;
 
+
 /*
  * ViewOptions
  *		Contents of rd_options for views
@@ -535,7 +549,7 @@ typedef struct ViewOptions
  *		True if relation's pages are stored in local buffers.
  */
 #define RelationUsesLocalBuffers(relation) \
-	((relation)->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
+	RelationHasSessionScope(relation)
 
 /*
  * RELATION_IS_LOCAL
diff --git a/src/include/utils/syscache.h b/src/include/utils/syscache.h
index f27b73d..eaf21d9 100644
--- a/src/include/utils/syscache.h
+++ b/src/include/utils/syscache.h
@@ -216,4 +216,8 @@ extern bool RelationSupportsSysCache(Oid relid);
 
 #define ReleaseSysCacheList(x)	ReleaseCatCacheList(x)
 
+
+extern void InsertSysCache(int cacheId, 
+						   Datum v1, Datum v2, Datum v3, Datum v4,
+						   HeapTuple tuple);
 #endif							/* SYSCACHE_H */
diff --git a/src/test/isolation/expected/inherit-global-temp.out b/src/test/isolation/expected/inherit-global-temp.out
new file mode 100644
index 0000000..6114f8c
--- /dev/null
+++ b/src/test/isolation/expected/inherit-global-temp.out
@@ -0,0 +1,218 @@
+Parsed test spec with 2 sessions
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_update_p s1_update_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_update_p: UPDATE inh_global_parent SET a = 11 WHERE a = 1;
+step s1_update_c: UPDATE inh_global_parent SET a = 13 WHERE a IN (3, 5);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+2              
+11             
+4              
+13             
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+4              
+13             
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+2              
+11             
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_update_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_update_c: UPDATE inh_global_parent SET a = 15 WHERE a IN (3, 5);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+6              
+15             
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+6              
+15             
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_delete_p s1_delete_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_delete_p: DELETE FROM inh_global_parent WHERE a = 2;
+step s1_delete_c: DELETE FROM inh_global_parent WHERE a IN (4, 6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+3              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_delete_c s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_delete_c: DELETE FROM inh_global_parent WHERE a IN (4, 6);
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+1              
+2              
+5              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_truncate_p s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+5              
+6              
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s2_truncate_p s1_select_p s1_select_c s2_select_p s2_select_c
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s2_truncate_p: TRUNCATE inh_global_parent;
+step s1_select_p: SELECT a FROM inh_global_parent;
+a              
+
+3              
+4              
+step s1_select_c: SELECT a FROM inh_global_temp_child_s1;
+a              
+
+3              
+4              
+step s2_select_p: SELECT a FROM inh_global_parent;
+a              
+
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2;
+a              
+
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_begin s1_truncate_p s2_select_p s1_commit
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_begin: BEGIN;
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s2_select_p: SELECT a FROM inh_global_parent; <waiting ...>
+step s1_commit: COMMIT;
+step s2_select_p: <... completed>
+a              
+
+5              
+6              
+
+starting permutation: s1_insert_p s1_insert_c s2_insert_c s1_begin s1_truncate_p s2_select_c s1_commit
+step s1_insert_p: INSERT INTO inh_global_parent VALUES (1), (2);
+step s1_insert_c: INSERT INTO inh_global_temp_child_s1 VALUES (3), (4);
+step s2_insert_c: INSERT INTO inh_global_temp_child_s2 VALUES (5), (6);
+step s1_begin: BEGIN;
+step s1_truncate_p: TRUNCATE inh_global_parent;
+step s2_select_c: SELECT a FROM inh_global_temp_child_s2; <waiting ...>
+step s1_commit: COMMIT;
+step s2_select_c: <... completed>
+a              
+
+5              
+6              
diff --git a/src/test/isolation/isolation_schedule b/src/test/isolation/isolation_schedule
index a2fa192..ef7aa85 100644
--- a/src/test/isolation/isolation_schedule
+++ b/src/test/isolation/isolation_schedule
@@ -88,3 +88,4 @@ test: plpgsql-toast
 test: truncate-conflict
 test: serializable-parallel
 test: serializable-parallel-2
+test: inherit-global-temp
diff --git a/src/test/isolation/specs/inherit-global-temp.spec b/src/test/isolation/specs/inherit-global-temp.spec
new file mode 100644
index 0000000..5e95dd6
--- /dev/null
+++ b/src/test/isolation/specs/inherit-global-temp.spec
@@ -0,0 +1,73 @@
+# This is a copy of the inherit-temp test with little changes for global temporary tables.
+#
+
+setup
+{
+  CREATE TABLE inh_global_parent (a int);
+}
+
+teardown
+{
+  DROP TABLE inh_global_parent;
+}
+
+# Session 1 executes actions which act directly on both the parent and
+# its child.  Abbreviation "c" is used for queries working on the child
+# and "p" on the parent.
+session "s1"
+setup
+{
+  CREATE GLOBAL TEMPORARY TABLE inh_global_temp_child_s1 () INHERITS (inh_global_parent);
+}
+step "s1_begin" { BEGIN; }
+step "s1_truncate_p" { TRUNCATE inh_global_parent; }
+step "s1_select_p" { SELECT a FROM inh_global_parent; }
+step "s1_select_c" { SELECT a FROM inh_global_temp_child_s1; }
+step "s1_insert_p" { INSERT INTO inh_global_parent VALUES (1), (2); }
+step "s1_insert_c" { INSERT INTO inh_global_temp_child_s1 VALUES (3), (4); }
+step "s1_update_p" { UPDATE inh_global_parent SET a = 11 WHERE a = 1; }
+step "s1_update_c" { UPDATE inh_global_parent SET a = 13 WHERE a IN (3, 5); }
+step "s1_delete_p" { DELETE FROM inh_global_parent WHERE a = 2; }
+step "s1_delete_c" { DELETE FROM inh_global_parent WHERE a IN (4, 6); }
+step "s1_commit" { COMMIT; }
+teardown
+{
+  DROP TABLE inh_global_temp_child_s1;
+}
+
+# Session 2 executes actions on the parent which act only on the child.
+session "s2"
+setup
+{
+  CREATE GLOBAL TEMPORARY TABLE inh_global_temp_child_s2 () INHERITS (inh_global_parent);
+}
+step "s2_truncate_p" { TRUNCATE inh_global_parent; }
+step "s2_select_p" { SELECT a FROM inh_global_parent; }
+step "s2_select_c" { SELECT a FROM inh_global_temp_child_s2; }
+step "s2_insert_c" { INSERT INTO inh_global_temp_child_s2 VALUES (5), (6); }
+step "s2_update_c" { UPDATE inh_global_parent SET a = 15 WHERE a IN (3, 5); }
+step "s2_delete_c" { DELETE FROM inh_global_parent WHERE a IN (4, 6); }
+teardown
+{
+  DROP TABLE inh_global_temp_child_s2;
+}
+
+# Check INSERT behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check UPDATE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_update_p" "s1_update_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_update_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check DELETE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_delete_p" "s1_delete_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_delete_c" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# Check TRUNCATE behavior across sessions
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_truncate_p" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s2_truncate_p" "s1_select_p" "s1_select_c" "s2_select_p" "s2_select_c"
+
+# TRUNCATE on a parent tree does not block access to temporary child relation
+# of another session, and blocks when scanning the parent.
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_begin" "s1_truncate_p" "s2_select_p" "s1_commit"
+permutation "s1_insert_p" "s1_insert_c" "s2_insert_c" "s1_begin" "s1_truncate_p" "s2_select_c" "s1_commit"
diff --git a/src/test/regress/expected/global_temp.out b/src/test/regress/expected/global_temp.out
new file mode 100644
index 0000000..ae1adb6
--- /dev/null
+++ b/src/test/regress/expected/global_temp.out
@@ -0,0 +1,247 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+-- Test ON COMMIT DELETE ROWS
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+   2
+(2 rows)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+SELECT * FROM global_temptest;
+ col 
+-----
+   1
+(1 row)
+
+COMMIT;
+SELECT * FROM global_temptest;
+ col 
+-----
+(0 rows)
+
+DROP TABLE global_temptest;
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+ col 
+-----
+   1
+(1 row)
+
+SELECT * FROM global_temptest2;
+ col 
+-----
+(0 rows)
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+ERROR:  unsupported ON COMMIT and foreign key combination
+DETAIL:  Table "global_temptest4" references "global_temptest3", but they do not have the same ON COMMIT setting.
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+ a 
+---
+(0 rows)
+
+DROP TABLE temp_parted_oncommit;
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+              relname              
+-----------------------------------
+ global_temp_parted_oncommit_test
+ global_temp_parted_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_parted_oncommit_test;
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+ a 
+---
+ 1
+(1 row)
+
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+            relname             
+--------------------------------
+ global_temp_inh_oncommit_test
+ global_temp_inh_oncommit_test1
+(2 rows)
+
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ERROR:  cannot inherit from temporary relation "global_temp_table"
+ROLLBACK;
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM global_temp_table;
+ a 
+---
+ 1
+(1 row)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+ 2
+(3 rows)
+
+COMMIT;
+SELECT * FROM normal_table;
+ a 
+---
+ 0
+ 1
+(2 rows)
+
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       1
+(1 row)
+
+\c
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+(0 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       2
+(1 row)
+
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+ aid | bid 
+-----+-----
+   1 |   1
+   2 |   2
+   3 |   3
+(3 rows)
+
+SELECT NEXTVAL( 'test_sequence' );
+ nextval 
+---------
+       3
+(1 row)
+
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
diff --git a/src/test/regress/expected/rules.out b/src/test/regress/expected/rules.out
index 2ab2115..7538601 100644
--- a/src/test/regress/expected/rules.out
+++ b/src/test/regress/expected/rules.out
@@ -1349,6 +1349,40 @@ pg_group| SELECT pg_authid.rolname AS groname,
           WHERE (pg_auth_members.roleid = pg_authid.oid)) AS grolist
    FROM pg_authid
   WHERE (NOT pg_authid.rolcanlogin);
+pg_gtt_statistic| SELECT s.starelid,
+    s.staattnum,
+    s.stainherit,
+    s.stanullfrac,
+    s.stawidth,
+    s.stadistinct,
+    s.stakind1,
+    s.stakind2,
+    s.stakind3,
+    s.stakind4,
+    s.stakind5,
+    s.staop1,
+    s.staop2,
+    s.staop3,
+    s.staop4,
+    s.staop5,
+    s.stacoll1,
+    s.stacoll2,
+    s.stacoll3,
+    s.stacoll4,
+    s.stacoll5,
+    s.stanumbers1,
+    s.stanumbers2,
+    s.stanumbers3,
+    s.stanumbers4,
+    s.stanumbers5,
+    s.stavalues1,
+    s.stavalues2,
+    s.stavalues3,
+    s.stavalues4,
+    s.stavalues5
+   FROM pg_class c,
+    LATERAL pg_gtt_statistic_for_relation(c.oid) s(starelid, staattnum, stainherit, stanullfrac, stawidth, stadistinct, stakind1, stakind2, stakind3, stakind4, stakind5, staop1, staop2, staop3, staop4, staop5, stacoll1, stacoll2, stacoll3, stacoll4, stacoll5, stanumbers1, stanumbers2, stanumbers3, stanumbers4, stanumbers5, stavalues1, stavalues2, stavalues3, stavalues4, stavalues5)
+  WHERE (c.relpersistence = 's'::"char");
 pg_hba_file_rules| SELECT a.line_number,
     a.type,
     a.database,
diff --git a/src/test/regress/expected/session_table.out b/src/test/regress/expected/session_table.out
new file mode 100644
index 0000000..1b9b3f4
--- /dev/null
+++ b/src/test/regress/expected/session_table.out
@@ -0,0 +1,64 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+ count 
+-------
+ 10000
+(1 row)
+
+\c
+select count(*) from my_private_table;
+ count 
+-------
+     0
+(1 row)
+
+select * from my_private_table where x=10001;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select * from my_private_table where y=10001;
+   x   |   y   
+-------+-------
+ 10001 | 10001
+(1 row)
+
+select count(*) from my_private_table;
+ count  
+--------
+ 100000
+(1 row)
+
+\c
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+ x | y 
+---+---
+(0 rows)
+
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+ x | y 
+---+---
+(0 rows)
+
+select * from my_private_table order by y desc limit 1;
+   x    |   y    
+--------+--------
+ 100000 | 100000
+(1 row)
+
+drop table  my_private_table;
diff --git a/src/test/regress/parallel_schedule b/src/test/regress/parallel_schedule
index d2b17dd..71c8ca4 100644
--- a/src/test/regress/parallel_schedule
+++ b/src/test/regress/parallel_schedule
@@ -107,7 +107,7 @@ test: json jsonb json_encoding jsonpath jsonpath_encoding jsonb_jsonpath
 # NB: temp.sql does a reconnect which transiently uses 2 connections,
 # so keep this parallel group to at most 19 tests
 # ----------
-test: plancache limit plpgsql copy2 temp domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
+test: plancache limit plpgsql copy2 temp global_temp session_table domain rangefuncs prepare conversion truncate alter_table sequence polymorphism rowtypes returning largeobject with xml
 
 # ----------
 # Another group of parallel tests
diff --git a/src/test/regress/serial_schedule b/src/test/regress/serial_schedule
index acba391..71abe08 100644
--- a/src/test/regress/serial_schedule
+++ b/src/test/regress/serial_schedule
@@ -172,6 +172,8 @@ test: limit
 test: plpgsql
 test: copy2
 test: temp
+test: global_temp
+test: session_table
 test: domain
 test: rangefuncs
 test: prepare
diff --git a/src/test/regress/sql/global_temp.sql b/src/test/regress/sql/global_temp.sql
new file mode 100644
index 0000000..3058b9b
--- /dev/null
+++ b/src/test/regress/sql/global_temp.sql
@@ -0,0 +1,151 @@
+--
+-- GLOBAL TEMP
+-- Test global temp relations
+--
+
+-- Test ON COMMIT DELETE ROWS
+
+CREATE GLOBAL TEMP TABLE global_temptest(col int) ON COMMIT DELETE ROWS;
+
+BEGIN;
+INSERT INTO global_temptest VALUES (1);
+INSERT INTO global_temptest VALUES (2);
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest(col) ON COMMIT DELETE ROWS AS SELECT 1;
+
+SELECT * FROM global_temptest;
+COMMIT;
+
+SELECT * FROM global_temptest;
+
+DROP TABLE global_temptest;
+
+-- Test foreign keys
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest1(col int PRIMARY KEY);
+CREATE GLOBAL TEMP TABLE global_temptest2(col int REFERENCES global_temptest1)
+  ON COMMIT DELETE ROWS;
+INSERT INTO global_temptest1 VALUES (1);
+INSERT INTO global_temptest2 VALUES (1);
+COMMIT;
+SELECT * FROM global_temptest1;
+SELECT * FROM global_temptest2;
+
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temptest3(col int PRIMARY KEY) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temptest4(col int REFERENCES global_temptest3);
+COMMIT;
+
+-- For partitioned temp tables, ON COMMIT actions ignore storage-less
+-- partitioned tables.
+BEGIN;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE temp_parted_oncommit_1
+  PARTITION OF temp_parted_oncommit
+  FOR VALUES IN (1) ON COMMIT DELETE ROWS;
+INSERT INTO temp_parted_oncommit VALUES (1);
+COMMIT;
+-- partitions are emptied by the previous commit
+SELECT * FROM temp_parted_oncommit;
+DROP TABLE temp_parted_oncommit;
+
+-- Using ON COMMIT DELETE on a partitioned table does not remove
+-- all rows if partitions preserve their data.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test (a int)
+  PARTITION BY LIST (a) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_parted_oncommit_test1
+  PARTITION OF global_temp_parted_oncommit_test
+  FOR VALUES IN (1) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_parted_oncommit_test VALUES (1);
+COMMIT;
+-- Data from the remaining partition is still here as its rows are
+-- preserved.
+SELECT * FROM global_temp_parted_oncommit_test;
+-- two relations remain in this case.
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_parted_oncommit_test%';
+DROP TABLE global_temp_parted_oncommit_test;
+
+-- Check dependencies between ON COMMIT actions with inheritance trees.
+-- Data on the parent is removed, and the child goes away.
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_inh_oncommit_test1 ()
+  INHERITS(global_temp_inh_oncommit_test) ON COMMIT PRESERVE ROWS;
+INSERT INTO global_temp_inh_oncommit_test1 VALUES (1);
+INSERT INTO global_temp_inh_oncommit_test VALUES (1);
+COMMIT;
+SELECT * FROM global_temp_inh_oncommit_test;
+-- two relations remain
+SELECT relname FROM pg_class WHERE relname LIKE 'global_temp_inh_oncommit_test%';
+DROP TABLE global_temp_inh_oncommit_test1;
+DROP TABLE global_temp_inh_oncommit_test;
+
+-- Global temp table cannot inherit from temporary relation
+BEGIN;
+CREATE TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE GLOBAL TEMP TABLE global_temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+ROLLBACK;
+
+-- Temp table can inherit from global temporary relation
+BEGIN;
+CREATE GLOBAL TEMP TABLE global_temp_table (a int) ON COMMIT DELETE ROWS;
+CREATE TEMP TABLE temp_table1 ()
+  INHERITS(global_temp_table) ON COMMIT PRESERVE ROWS;
+CREATE TEMP TABLE temp_table2 ()
+  INHERITS(global_temp_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO global_temp_table VALUES (0);
+SELECT * FROM global_temp_table;
+COMMIT;
+SELECT * FROM global_temp_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE global_temp_table;
+
+-- Global temp table can inherit from normal relation
+BEGIN;
+CREATE TABLE normal_table (a int);
+CREATE GLOBAL TEMP TABLE temp_table1 ()
+  INHERITS(normal_table) ON COMMIT PRESERVE ROWS;
+CREATE GLOBAL TEMP TABLE temp_table2 ()
+  INHERITS(normal_table) ON COMMIT DELETE ROWS;
+INSERT INTO temp_table2 VALUES (2);
+INSERT INTO temp_table1 VALUES (1);
+INSERT INTO normal_table VALUES (0);
+SELECT * FROM normal_table;
+COMMIT;
+SELECT * FROM normal_table;
+DROP TABLE temp_table2;
+DROP TABLE temp_table1;
+DROP TABLE normal_table;
+
+-- Check SERIAL and BIGSERIAL pseudo-types
+CREATE GLOBAL TEMP TABLE global_temp_table ( aid BIGSERIAL, bid SERIAL );
+CREATE SEQUENCE test_sequence;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+\c
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+INSERT INTO global_temp_table DEFAULT VALUES;
+SELECT * FROM global_temp_table;
+SELECT NEXTVAL( 'test_sequence' );
+DROP TABLE global_temp_table;
+DROP SEQUENCE test_sequence;
diff --git a/src/test/regress/sql/session_table.sql b/src/test/regress/sql/session_table.sql
new file mode 100644
index 0000000..c6663dc
--- /dev/null
+++ b/src/test/regress/sql/session_table.sql
@@ -0,0 +1,18 @@
+create session table my_private_table(x integer primary key, y integer);
+insert into my_private_table values (generate_series(1,10000), generate_series(1,10000));
+select count(*) from my_private_table;
+\c
+select count(*) from my_private_table;
+select * from my_private_table where x=10001;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+create index on my_private_table(y);
+select * from my_private_table where x=10001;
+select * from my_private_table where y=10001;
+select count(*) from my_private_table;
+\c
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+insert into my_private_table values (generate_series(1,100000), generate_series(1,100000));
+select * from my_private_table where x=100001;
+select * from my_private_table order by y desc limit 1;
+drop table  my_private_table;