Allow pageinspect's bt_page_stats function to return a set of rows instead of a single row

diff --git a/contrib/pageinspect/Makefile b/contrib/pageinspect/Makefile
index 5c07365..31d7b1c 100644
--- a/contrib/pageinspect/Makefile
+++ b/contrib/pageinspect/Makefile
@@ -13,12 +13,12 @@ OBJS = \
 	rawpage.o
 
 EXTENSION = pageinspect
-DATA =  pageinspect--1.9--1.10.sql pageinspect--1.8--1.9.sql \
-	pageinspect--1.7--1.8.sql pageinspect--1.6--1.7.sql \
-	pageinspect--1.5.sql pageinspect--1.5--1.6.sql \
-	pageinspect--1.4--1.5.sql pageinspect--1.3--1.4.sql \
-	pageinspect--1.2--1.3.sql pageinspect--1.1--1.2.sql \
-	pageinspect--1.0--1.1.sql
+DATA =  pageinspect--1.10--1.11.sql pageinspect--1.9--1.10.sql \
+	pageinspect--1.8--1.9.sql pageinspect--1.7--1.8.sql \
+	pageinspect--1.6--1.7.sql pageinspect--1.5.sql \
+	pageinspect--1.5--1.6.sql pageinspect--1.4--1.5.sql \
+	pageinspect--1.3--1.4.sql pageinspect--1.2--1.3.sql \
+	pageinspect--1.1--1.2.sql pageinspect--1.0--1.1.sql
 PGFILEDESC = "pageinspect - functions to inspect contents of database pages"
 
 REGRESS = page btree brin gin gist hash checksum oldextversions
diff --git a/contrib/pageinspect/btreefuncs.c b/contrib/pageinspect/btreefuncs.c
index 62f2c1b..5dd216e 100644
--- a/contrib/pageinspect/btreefuncs.c
+++ b/contrib/pageinspect/btreefuncs.c
@@ -46,6 +46,7 @@ PG_FUNCTION_INFO_V1(bt_page_items);
 PG_FUNCTION_INFO_V1(bt_page_items_bytea);
 PG_FUNCTION_INFO_V1(bt_page_stats_1_9);
 PG_FUNCTION_INFO_V1(bt_page_stats);
+PG_FUNCTION_INFO_V1(bt_multi_page_stats);
 
 #define IS_INDEX(r) ((r)->rd_rel->relkind == RELKIND_INDEX)
 #define IS_BTREE(r) ((r)->rd_rel->relam == BTREE_AM_OID)
@@ -80,6 +81,26 @@ typedef struct BTPageStat
 	BTCycleId	btpo_cycleid;
 } BTPageStat;
 
+/*
+ * cross-call data structure for SRF for page stats
+ */
+typedef struct ua_page_stats
+{
+	uint64		blkno;
+	uint64		blk_count;
+}			ua_page_stats;
+
+/*
+ * cross-call data structure for SRF for page items
+ */
+typedef struct ua_page_items
+{
+	Page		page;
+	OffsetNumber offset;
+	bool		leafpage;
+	bool		rightmost;
+	TupleDesc	tupd;
+}			ua_page_items;
 
 /* -------------------------------------------------
  * GetBTPageStatistics()
@@ -177,34 +198,15 @@ GetBTPageStatistics(BlockNumber blkno, Buffer buffer, BTPageStat *stat)
 }
 
 /* -----------------------------------------------
- * bt_page_stats()
+ * bt_index_block_validate()
  *
- * Usage: SELECT * FROM bt_page_stats('t1_pkey', 1);
+ * Validate index type is btree and block number
+ * is within a valid block number range.
  * -----------------------------------------------
  */
-static Datum
-bt_page_stats_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
+static void
+bt_index_block_validate(Relation rel, int64 blkno)
 {
-	text	   *relname = PG_GETARG_TEXT_PP(0);
-	int64		blkno = (ext_version == PAGEINSPECT_V1_8 ? PG_GETARG_UINT32(1) : PG_GETARG_INT64(1));
-	Buffer		buffer;
-	Relation	rel;
-	RangeVar   *relrv;
-	Datum		result;
-	HeapTuple	tuple;
-	TupleDesc	tupleDesc;
-	int			j;
-	char	   *values[11];
-	BTPageStat	stat;
-
-	if (!superuser())
-		ereport(ERROR,
-				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
-				 errmsg("must be superuser to use pageinspect functions")));
-
-	relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
-	rel = relation_openrv(relrv, AccessShareLock);
-
 	if (!IS_INDEX(rel) || !IS_BTREE(rel))
 		ereport(ERROR,
 				(errcode(ERRCODE_WRONG_OBJECT_TYPE),
@@ -232,6 +234,38 @@ bt_page_stats_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
 				 errmsg("block 0 is a meta page")));
 
 	CHECK_RELATION_BLOCK_RANGE(rel, blkno);
+}
+
+/* -----------------------------------------------
+ * bt_page_stats()
+ *
+ * Usage: SELECT * FROM bt_page_stats('t1_pkey', 1);
+ * -----------------------------------------------
+ */
+static Datum
+bt_page_stats_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
+{
+	text	   *relname = PG_GETARG_TEXT_PP(0);
+	int64		blkno = (ext_version == PAGEINSPECT_V1_8 ? PG_GETARG_UINT32(1) : PG_GETARG_INT64(1));
+	Buffer		buffer;
+	Relation	rel;
+	RangeVar   *relrv;
+	Datum		result;
+	HeapTuple	tuple;
+	TupleDesc	tupleDesc;
+	int			j;
+	char	   *values[11];
+	BTPageStat	stat;
+
+	if (!superuser())
+		ereport(ERROR,
+				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
+				 errmsg("must be superuser to use pageinspect functions")));
+
+	relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
+	rel = relation_openrv(relrv, AccessShareLock);
+
+	bt_index_block_validate(rel, blkno);
 
 	buffer = ReadBuffer(rel, blkno);
 	LockBuffer(buffer, BUFFER_LOCK_SHARE);
@@ -270,6 +304,134 @@ bt_page_stats_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
 	PG_RETURN_DATUM(result);
 }
 
+/* -----------------------------------------------
+ * bt_multi_page_stats()
+ *
+ * Usage: SELECT * FROM bt_page_stats('t1_pkey', 1, 1);
+ * 		  Where the first argument is the name followed
+ * 		  by block number and number of blocks to be
+ * 		  returned.
+ * -----------------------------------------------
+ */
+Datum
+bt_multi_page_stats(PG_FUNCTION_ARGS)
+{
+	text	   *relname = PG_GETARG_TEXT_PP(0);
+	int64		blkno = PG_GETARG_INT64(1);
+	int64		blk_count = PG_GETARG_INT64(2);
+	RangeVar   *relrv;
+	Relation	rel;
+	ua_page_stats *uargs;
+	FuncCallContext *fctx;
+	MemoryContext mctx;
+
+	if (!superuser())
+		ereport(ERROR,
+				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
+				 errmsg("must be superuser to use pageinspect functions")));
+
+	if (SRF_IS_FIRSTCALL())
+	{
+		fctx = SRF_FIRSTCALL_INIT();
+
+		relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
+		rel = relation_openrv(relrv, AccessShareLock);
+
+		/*
+		 * Check if relaion is a valid btree index and block number is within
+		 * the valid range.
+		 */
+		bt_index_block_validate(rel, blkno);
+
+		relation_close(rel, AccessShareLock);
+
+		mctx = MemoryContextSwitchTo(fctx->multi_call_memory_ctx);
+
+		uargs = palloc(sizeof(struct ua_page_stats));
+
+		/*
+		 * Set the start block number and the total number of blocks to ne
+		 * retrieved.
+		 */
+		uargs->blkno = blkno;
+		uargs->blk_count = blk_count;
+
+		fctx->user_fctx = uargs;
+
+		MemoryContextSwitchTo(mctx);
+	}
+
+	fctx = SRF_PERCALL_SETUP();
+	uargs = fctx->user_fctx;
+
+	/* We need to fetch next block statistics */
+	if (uargs->blk_count > 0)
+	{
+		Buffer		buffer;
+		Datum		result;
+		HeapTuple	tuple;
+		int			j;
+		char	   *values[11];
+		BTPageStat	stat;
+		TupleDesc	tupleDesc;
+
+		relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
+		rel = relation_openrv(relrv, AccessShareLock);
+
+		/*
+		 * Since index may have changed between function calls, double check
+		 * that we are still within the vaild range.
+		 */
+		CHECK_RELATION_BLOCK_RANGE(rel, uargs->blkno);
+
+		buffer = ReadBuffer(rel, uargs->blkno);
+		LockBuffer(buffer, BUFFER_LOCK_SHARE);
+
+		/* keep compiler quiet */
+		stat.btpo_prev = stat.btpo_next = InvalidBlockNumber;
+		stat.btpo_flags = stat.free_size = stat.avg_item_size = 0;
+
+		GetBTPageStatistics(uargs->blkno, buffer, &stat);
+
+		UnlockReleaseBuffer(buffer);
+		relation_close(rel, AccessShareLock);
+
+		/* Build a tuple descriptor for our result type */
+		if (get_call_result_type(fcinfo, NULL, &tupleDesc) != TYPEFUNC_COMPOSITE)
+			elog(ERROR, "return type must be a row type");
+
+		j = 0;
+		values[j++] = psprintf("%u", stat.blkno);
+		values[j++] = psprintf("%c", stat.type);
+		values[j++] = psprintf("%u", stat.live_items);
+		values[j++] = psprintf("%u", stat.dead_items);
+		values[j++] = psprintf("%u", stat.avg_item_size);
+		values[j++] = psprintf("%u", stat.page_size);
+		values[j++] = psprintf("%u", stat.free_size);
+		values[j++] = psprintf("%u", stat.btpo_prev);
+		values[j++] = psprintf("%u", stat.btpo_next);
+		values[j++] = psprintf("%u", stat.btpo_level);
+		values[j++] = psprintf("%d", stat.btpo_flags);
+
+		/* Constructu tuple to be returned */
+		tuple = BuildTupleFromCStrings(TupleDescGetAttInMetadata(tupleDesc),
+									   values);
+
+		result = HeapTupleGetDatum(tuple);
+
+		/*
+		 * Move to the next block number and decrement the number of blocks
+		 * still to be fetched
+		 */
+		uargs->blkno++;
+		uargs->blk_count--;
+
+		SRF_RETURN_NEXT(fctx, result);
+	}
+
+	SRF_RETURN_DONE(fctx);
+}
+
 Datum
 bt_page_stats_1_9(PG_FUNCTION_ARGS)
 {
@@ -283,19 +445,6 @@ bt_page_stats(PG_FUNCTION_ARGS)
 	return bt_page_stats_internal(fcinfo, PAGEINSPECT_V1_8);
 }
 
-
-/*
- * cross-call data structure for SRF
- */
-struct user_args
-{
-	Page		page;
-	OffsetNumber offset;
-	bool		leafpage;
-	bool		rightmost;
-	TupleDesc	tupd;
-};
-
 /*-------------------------------------------------------
  * bt_page_print_tuples()
  *
@@ -303,7 +452,7 @@ struct user_args
  * ------------------------------------------------------
  */
 static Datum
-bt_page_print_tuples(struct user_args *uargs)
+bt_page_print_tuples(struct ua_page_items *uargs)
 {
 	Page		page = uargs->page;
 	OffsetNumber offset = uargs->offset;
@@ -457,7 +606,7 @@ bt_page_items_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
 	Datum		result;
 	FuncCallContext *fctx;
 	MemoryContext mctx;
-	struct user_args *uargs;
+	struct ua_page_items *uargs;
 
 	if (!superuser())
 		ereport(ERROR,
@@ -477,33 +626,7 @@ bt_page_items_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
 		relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
 		rel = relation_openrv(relrv, AccessShareLock);
 
-		if (!IS_INDEX(rel) || !IS_BTREE(rel))
-			ereport(ERROR,
-					(errcode(ERRCODE_WRONG_OBJECT_TYPE),
-					 errmsg("\"%s\" is not a %s index",
-							RelationGetRelationName(rel), "btree")));
-
-		/*
-		 * Reject attempts to read non-local temporary relations; we would be
-		 * likely to get wrong data since we have no visibility into the
-		 * owning session's local buffers.
-		 */
-		if (RELATION_IS_OTHER_TEMP(rel))
-			ereport(ERROR,
-					(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
-					 errmsg("cannot access temporary tables of other sessions")));
-
-		if (blkno < 0 || blkno > MaxBlockNumber)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("invalid block number")));
-
-		if (blkno == 0)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("block 0 is a meta page")));
-
-		CHECK_RELATION_BLOCK_RANGE(rel, blkno);
+		bt_index_block_validate(rel, blkno);
 
 		buffer = ReadBuffer(rel, blkno);
 		LockBuffer(buffer, BUFFER_LOCK_SHARE);
@@ -515,7 +638,7 @@ bt_page_items_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
 		 */
 		mctx = MemoryContextSwitchTo(fctx->multi_call_memory_ctx);
 
-		uargs = palloc(sizeof(struct user_args));
+		uargs = palloc(sizeof(struct ua_page_items));
 
 		uargs->page = palloc(BLCKSZ);
 		memcpy(uargs->page, BufferGetPage(buffer), BLCKSZ);
@@ -591,7 +714,7 @@ bt_page_items_bytea(PG_FUNCTION_ARGS)
 	bytea	   *raw_page = PG_GETARG_BYTEA_P(0);
 	Datum		result;
 	FuncCallContext *fctx;
-	struct user_args *uargs;
+	struct ua_page_items *uargs;
 
 	if (!superuser())
 		ereport(ERROR,
@@ -607,7 +730,7 @@ bt_page_items_bytea(PG_FUNCTION_ARGS)
 		fctx = SRF_FIRSTCALL_INIT();
 		mctx = MemoryContextSwitchTo(fctx->multi_call_memory_ctx);
 
-		uargs = palloc(sizeof(struct user_args));
+		uargs = palloc(sizeof(struct ua_page_items));
 
 		uargs->page = get_page_from_raw(raw_page);
 
diff --git a/contrib/pageinspect/expected/btree.out b/contrib/pageinspect/expected/btree.out
index 035a81a..383b9be 100644
--- a/contrib/pageinspect/expected/btree.out
+++ b/contrib/pageinspect/expected/btree.out
@@ -34,6 +34,117 @@ btpo_flags    | 3
 
 SELECT * FROM bt_page_stats('test1_a_idx', 2);
 ERROR:  block number out of range
+-- bt_multi_page_stats() function returns a set of records of page statistics.
+CREATE TABLE test2 AS (SELECT generate_series(1, 5000) AS col1);
+CREATE INDEX test2_col1_idx ON test2(col1);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 0, 1);
+ERROR:  block 0 is a meta page
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, -1);
+ERROR:  block number out of range
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, 0);
+(0 rows)
+
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, 2);
+-[ RECORD 1 ]-+-----
+blkno         | 1
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 0
+btpo_next     | 2
+btpo_level    | 0
+btpo_flags    | 1
+-[ RECORD 2 ]-+-----
+blkno         | 2
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 1
+btpo_next     | 4
+btpo_level    | 0
+btpo_flags    | 1
+
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 2, 6);
+-[ RECORD 1 ]-+-----
+blkno         | 2
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 1
+btpo_next     | 4
+btpo_level    | 0
+btpo_flags    | 1
+-[ RECORD 2 ]-+-----
+blkno         | 3
+type          | r
+live_items    | 14
+dead_items    | 0
+avg_item_size | 15
+page_size     | 8192
+free_size     | 7876
+btpo_prev     | 0
+btpo_next     | 0
+btpo_level    | 1
+btpo_flags    | 2
+-[ RECORD 3 ]-+-----
+blkno         | 4
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 2
+btpo_next     | 5
+btpo_level    | 0
+btpo_flags    | 1
+-[ RECORD 4 ]-+-----
+blkno         | 5
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 4
+btpo_next     | 6
+btpo_level    | 0
+btpo_flags    | 1
+-[ RECORD 5 ]-+-----
+blkno         | 6
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 5
+btpo_next     | 7
+btpo_level    | 0
+btpo_flags    | 1
+-[ RECORD 6 ]-+-----
+blkno         | 7
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 6
+btpo_next     | 8
+btpo_level    | 0
+btpo_flags    | 1
+
+DROP TABLE test2;
 SELECT * FROM bt_page_items('test1_a_idx', -1);
 ERROR:  invalid block number
 SELECT * FROM bt_page_items('test1_a_idx', 0);
diff --git a/contrib/pageinspect/pageinspect--1.10--1.11.sql b/contrib/pageinspect/pageinspect--1.10--1.11.sql
index e69de29..976d029 100644
--- a/contrib/pageinspect/pageinspect--1.10--1.11.sql
+++ b/contrib/pageinspect/pageinspect--1.10--1.11.sql
@@ -0,0 +1,23 @@
+/* contrib/pageinspect/pageinspect--1.10--1.11.sql */
+
+-- complain if script is sourced in psql, rather than via ALTER EXTENSION
+\echo Use "ALTER EXTENSION pageinspect UPDATE TO '1.11'" to load this file. \quit
+
+--
+-- bt_multi_page_stats()
+--
+CREATE FUNCTION bt_multi_page_stats(IN relname text, IN blkno int8, IN blk_count int8,
+    OUT blkno int8,
+    OUT type "char",
+    OUT live_items int4,
+    OUT dead_items int4,
+    OUT avg_item_size int4,
+    OUT page_size int4,
+    OUT free_size int4,
+    OUT btpo_prev int8,
+    OUT btpo_next int8,
+    OUT btpo_level int8,
+    OUT btpo_flags int4)
+RETURNS SETOF record
+AS 'MODULE_PATHNAME', 'bt_multi_page_stats'
+LANGUAGE C STRICT PARALLEL SAFE;
diff --git a/contrib/pageinspect/pageinspect.control b/contrib/pageinspect/pageinspect.control
index 7cdf379..f277413 100644
--- a/contrib/pageinspect/pageinspect.control
+++ b/contrib/pageinspect/pageinspect.control
@@ -1,5 +1,5 @@
 # pageinspect extension
 comment = 'inspect the contents of database pages at a low level'
-default_version = '1.10'
+default_version = '1.11'
 module_pathname = '$libdir/pageinspect'
 relocatable = true
diff --git a/contrib/pageinspect/sql/btree.sql b/contrib/pageinspect/sql/btree.sql
index 1f554f0..9a95914 100644
--- a/contrib/pageinspect/sql/btree.sql
+++ b/contrib/pageinspect/sql/btree.sql
@@ -11,6 +11,16 @@ SELECT * FROM bt_page_stats('test1_a_idx', 0);
 SELECT * FROM bt_page_stats('test1_a_idx', 1);
 SELECT * FROM bt_page_stats('test1_a_idx', 2);
 
+-- bt_multi_page_stats() function returns a set of records of page statistics.
+CREATE TABLE test2 AS (SELECT generate_series(1, 5000) AS col1);
+CREATE INDEX test2_col1_idx ON test2(col1);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 0, 1);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, -1);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, 0);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, 2);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 2, 6);
+DROP TABLE test2;
+
 SELECT * FROM bt_page_items('test1_a_idx', -1);
 SELECT * FROM bt_page_items('test1_a_idx', 0);
 SELECT * FROM bt_page_items('test1_a_idx', 1);

diff --git a/contrib/pageinspect/Makefile b/contrib/pageinspect/Makefile
index 5c07365..31d7b1c 100644
--- a/contrib/pageinspect/Makefile
+++ b/contrib/pageinspect/Makefile
@@ -13,12 +13,12 @@ OBJS = \
 	rawpage.o
 
 EXTENSION = pageinspect
-DATA =  pageinspect--1.9--1.10.sql pageinspect--1.8--1.9.sql \
-	pageinspect--1.7--1.8.sql pageinspect--1.6--1.7.sql \
-	pageinspect--1.5.sql pageinspect--1.5--1.6.sql \
-	pageinspect--1.4--1.5.sql pageinspect--1.3--1.4.sql \
-	pageinspect--1.2--1.3.sql pageinspect--1.1--1.2.sql \
-	pageinspect--1.0--1.1.sql
+DATA =  pageinspect--1.10--1.11.sql pageinspect--1.9--1.10.sql \
+	pageinspect--1.8--1.9.sql pageinspect--1.7--1.8.sql \
+	pageinspect--1.6--1.7.sql pageinspect--1.5.sql \
+	pageinspect--1.5--1.6.sql pageinspect--1.4--1.5.sql \
+	pageinspect--1.3--1.4.sql pageinspect--1.2--1.3.sql \
+	pageinspect--1.1--1.2.sql pageinspect--1.0--1.1.sql
 PGFILEDESC = "pageinspect - functions to inspect contents of database pages"
 
 REGRESS = page btree brin gin gist hash checksum oldextversions
diff --git a/contrib/pageinspect/btreefuncs.c b/contrib/pageinspect/btreefuncs.c
index 9375d55..f7ec95c 100644
--- a/contrib/pageinspect/btreefuncs.c
+++ b/contrib/pageinspect/btreefuncs.c
@@ -46,6 +46,7 @@ PG_FUNCTION_INFO_V1(bt_page_items);
 PG_FUNCTION_INFO_V1(bt_page_items_bytea);
 PG_FUNCTION_INFO_V1(bt_page_stats_1_9);
 PG_FUNCTION_INFO_V1(bt_page_stats);
+PG_FUNCTION_INFO_V1(bt_multi_page_stats);
 
 #define IS_INDEX(r) ((r)->rd_rel->relkind == RELKIND_INDEX)
 #define IS_BTREE(r) ((r)->rd_rel->relam == BTREE_AM_OID)
@@ -80,6 +81,26 @@ typedef struct BTPageStat
 	BTCycleId	btpo_cycleid;
 } BTPageStat;
 
+/*
+ * cross-call data structure for SRF for page stats
+ */
+typedef struct ua_page_stats
+{
+	uint64		blkno;
+	uint64		blk_count;
+}			ua_page_stats;
+
+/*
+ * cross-call data structure for SRF for page items
+ */
+typedef struct ua_page_items
+{
+	Page		page;
+	OffsetNumber offset;
+	bool		leafpage;
+	bool		rightmost;
+	TupleDesc	tupd;
+}			ua_page_items;
 
 /* -------------------------------------------------
  * GetBTPageStatistics()
@@ -177,34 +198,15 @@ GetBTPageStatistics(BlockNumber blkno, Buffer buffer, BTPageStat *stat)
 }
 
 /* -----------------------------------------------
- * bt_page_stats()
+ * bt_index_block_validate()
  *
- * Usage: SELECT * FROM bt_page_stats('t1_pkey', 1);
+ * Validate index type is btree and block number
+ * is within a valid block number range.
  * -----------------------------------------------
  */
-static Datum
-bt_page_stats_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
+static void
+bt_index_block_validate(Relation rel, int64 blkno)
 {
-	text	   *relname = PG_GETARG_TEXT_PP(0);
-	int64		blkno = (ext_version == PAGEINSPECT_V1_8 ? PG_GETARG_UINT32(1) : PG_GETARG_INT64(1));
-	Buffer		buffer;
-	Relation	rel;
-	RangeVar   *relrv;
-	Datum		result;
-	HeapTuple	tuple;
-	TupleDesc	tupleDesc;
-	int			j;
-	char	   *values[11];
-	BTPageStat	stat;
-
-	if (!superuser())
-		ereport(ERROR,
-				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
-				 errmsg("must be superuser to use pageinspect functions")));
-
-	relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
-	rel = relation_openrv(relrv, AccessShareLock);
-
 	if (!IS_INDEX(rel) || !IS_BTREE(rel))
 		ereport(ERROR,
 				(errcode(ERRCODE_WRONG_OBJECT_TYPE),
@@ -232,6 +234,38 @@ bt_page_stats_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
 				 errmsg("block 0 is a meta page")));
 
 	CHECK_RELATION_BLOCK_RANGE(rel, blkno);
+}
+
+/* -----------------------------------------------
+ * bt_page_stats()
+ *
+ * Usage: SELECT * FROM bt_page_stats('t1_pkey', 1);
+ * -----------------------------------------------
+ */
+static Datum
+bt_page_stats_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
+{
+	text	   *relname = PG_GETARG_TEXT_PP(0);
+	int64		blkno = (ext_version == PAGEINSPECT_V1_8 ? PG_GETARG_UINT32(1) : PG_GETARG_INT64(1));
+	Buffer		buffer;
+	Relation	rel;
+	RangeVar   *relrv;
+	Datum		result;
+	HeapTuple	tuple;
+	TupleDesc	tupleDesc;
+	int			j;
+	char	   *values[11];
+	BTPageStat	stat;
+
+	if (!superuser())
+		ereport(ERROR,
+				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
+				 errmsg("must be superuser to use pageinspect functions")));
+
+	relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
+	rel = relation_openrv(relrv, AccessShareLock);
+
+	bt_index_block_validate(rel, blkno);
 
 	buffer = ReadBuffer(rel, blkno);
 	LockBuffer(buffer, BUFFER_LOCK_SHARE);
@@ -270,6 +304,134 @@ bt_page_stats_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
 	PG_RETURN_DATUM(result);
 }
 
+/* -----------------------------------------------
+ * bt_multi_page_stats()
+ *
+ * Usage: SELECT * FROM bt_page_stats('t1_pkey', 1, 1);
+ * 		  Where the first argument is the name followed
+ * 		  by block number and number of blocks to be
+ * 		  returned.
+ * -----------------------------------------------
+ */
+Datum
+bt_multi_page_stats(PG_FUNCTION_ARGS)
+{
+	text	   *relname = PG_GETARG_TEXT_PP(0);
+	int64		blkno = PG_GETARG_INT64(1);
+	int64		blk_count = PG_GETARG_INT64(2);
+	RangeVar   *relrv;
+	Relation	rel;
+	ua_page_stats *uargs;
+	FuncCallContext *fctx;
+	MemoryContext mctx;
+
+	if (!superuser())
+		ereport(ERROR,
+				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
+				 errmsg("must be superuser to use pageinspect functions")));
+
+	if (SRF_IS_FIRSTCALL())
+	{
+		fctx = SRF_FIRSTCALL_INIT();
+
+		relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
+		rel = relation_openrv(relrv, AccessShareLock);
+
+		/*
+		 * Check if relaion is a valid btree index and block number is within
+		 * the valid range.
+		 */
+		bt_index_block_validate(rel, blkno);
+
+		relation_close(rel, AccessShareLock);
+
+		mctx = MemoryContextSwitchTo(fctx->multi_call_memory_ctx);
+
+		uargs = palloc(sizeof(struct ua_page_stats));
+
+		/*
+		 * Set the start block number and the total number of blocks to ne
+		 * retrieved.
+		 */
+		uargs->blkno = blkno;
+		uargs->blk_count = blk_count;
+
+		fctx->user_fctx = uargs;
+
+		MemoryContextSwitchTo(mctx);
+	}
+
+	fctx = SRF_PERCALL_SETUP();
+	uargs = fctx->user_fctx;
+
+	/* We need to fetch next block statistics */
+	if (uargs->blk_count > 0)
+	{
+		Buffer		buffer;
+		Datum		result;
+		HeapTuple	tuple;
+		int			j;
+		char	   *values[11];
+		BTPageStat	stat;
+		TupleDesc	tupleDesc;
+
+		relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
+		rel = relation_openrv(relrv, AccessShareLock);
+
+		/*
+		 * Since index may have changed between function calls, double check
+		 * that we are still within the vaild range.
+		 */
+		CHECK_RELATION_BLOCK_RANGE(rel, uargs->blkno);
+
+		buffer = ReadBuffer(rel, uargs->blkno);
+		LockBuffer(buffer, BUFFER_LOCK_SHARE);
+
+		/* keep compiler quiet */
+		stat.btpo_prev = stat.btpo_next = InvalidBlockNumber;
+		stat.btpo_flags = stat.free_size = stat.avg_item_size = 0;
+
+		GetBTPageStatistics(uargs->blkno, buffer, &stat);
+
+		UnlockReleaseBuffer(buffer);
+		relation_close(rel, AccessShareLock);
+
+		/* Build a tuple descriptor for our result type */
+		if (get_call_result_type(fcinfo, NULL, &tupleDesc) != TYPEFUNC_COMPOSITE)
+			elog(ERROR, "return type must be a row type");
+
+		j = 0;
+		values[j++] = psprintf("%u", stat.blkno);
+		values[j++] = psprintf("%c", stat.type);
+		values[j++] = psprintf("%u", stat.live_items);
+		values[j++] = psprintf("%u", stat.dead_items);
+		values[j++] = psprintf("%u", stat.avg_item_size);
+		values[j++] = psprintf("%u", stat.page_size);
+		values[j++] = psprintf("%u", stat.free_size);
+		values[j++] = psprintf("%u", stat.btpo_prev);
+		values[j++] = psprintf("%u", stat.btpo_next);
+		values[j++] = psprintf("%u", stat.btpo_level);
+		values[j++] = psprintf("%d", stat.btpo_flags);
+
+		/* Constructu tuple to be returned */
+		tuple = BuildTupleFromCStrings(TupleDescGetAttInMetadata(tupleDesc),
+									   values);
+
+		result = HeapTupleGetDatum(tuple);
+
+		/*
+		 * Move to the next block number and decrement the number of blocks
+		 * still to be fetched
+		 */
+		uargs->blkno++;
+		uargs->blk_count--;
+
+		SRF_RETURN_NEXT(fctx, result);
+	}
+
+	SRF_RETURN_DONE(fctx);
+}
+
 Datum
 bt_page_stats_1_9(PG_FUNCTION_ARGS)
 {
@@ -283,19 +445,6 @@ bt_page_stats(PG_FUNCTION_ARGS)
 	return bt_page_stats_internal(fcinfo, PAGEINSPECT_V1_8);
 }
 
-
-/*
- * cross-call data structure for SRF
- */
-struct user_args
-{
-	Page		page;
-	OffsetNumber offset;
-	bool		leafpage;
-	bool		rightmost;
-	TupleDesc	tupd;
-};
-
 /*-------------------------------------------------------
  * bt_page_print_tuples()
  *
@@ -303,7 +452,7 @@ struct user_args
  * ------------------------------------------------------
  */
 static Datum
-bt_page_print_tuples(struct user_args *uargs)
+bt_page_print_tuples(struct ua_page_items *uargs)
 {
 	Page		page = uargs->page;
 	OffsetNumber offset = uargs->offset;
@@ -453,7 +602,7 @@ bt_page_items_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
 	Datum		result;
 	FuncCallContext *fctx;
 	MemoryContext mctx;
-	struct user_args *uargs;
+	struct ua_page_items *uargs;
 
 	if (!superuser())
 		ereport(ERROR,
@@ -473,33 +622,7 @@ bt_page_items_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
 		relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
 		rel = relation_openrv(relrv, AccessShareLock);
 
-		if (!IS_INDEX(rel) || !IS_BTREE(rel))
-			ereport(ERROR,
-					(errcode(ERRCODE_WRONG_OBJECT_TYPE),
-					 errmsg("\"%s\" is not a %s index",
-							RelationGetRelationName(rel), "btree")));
-
-		/*
-		 * Reject attempts to read non-local temporary relations; we would be
-		 * likely to get wrong data since we have no visibility into the
-		 * owning session's local buffers.
-		 */
-		if (RELATION_IS_OTHER_TEMP(rel))
-			ereport(ERROR,
-					(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
-					 errmsg("cannot access temporary tables of other sessions")));
-
-		if (blkno < 0 || blkno > MaxBlockNumber)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("invalid block number")));
-
-		if (blkno == 0)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("block 0 is a meta page")));
-
-		CHECK_RELATION_BLOCK_RANGE(rel, blkno);
+		bt_index_block_validate(rel, blkno);
 
 		buffer = ReadBuffer(rel, blkno);
 		LockBuffer(buffer, BUFFER_LOCK_SHARE);
@@ -511,7 +634,7 @@ bt_page_items_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
 		 */
 		mctx = MemoryContextSwitchTo(fctx->multi_call_memory_ctx);
 
-		uargs = palloc(sizeof(struct user_args));
+		uargs = palloc(sizeof(struct ua_page_items));
 
 		uargs->page = palloc(BLCKSZ);
 		memcpy(uargs->page, BufferGetPage(buffer), BLCKSZ);
@@ -587,7 +710,7 @@ bt_page_items_bytea(PG_FUNCTION_ARGS)
 	bytea	   *raw_page = PG_GETARG_BYTEA_P(0);
 	Datum		result;
 	FuncCallContext *fctx;
-	struct user_args *uargs;
+	struct ua_page_items *uargs;
 
 	if (!superuser())
 		ereport(ERROR,
@@ -603,7 +726,7 @@ bt_page_items_bytea(PG_FUNCTION_ARGS)
 		fctx = SRF_FIRSTCALL_INIT();
 		mctx = MemoryContextSwitchTo(fctx->multi_call_memory_ctx);
 
-		uargs = palloc(sizeof(struct user_args));
+		uargs = palloc(sizeof(struct ua_page_items));
 
 		uargs->page = get_page_from_raw(raw_page);
 
diff --git a/contrib/pageinspect/expected/btree.out b/contrib/pageinspect/expected/btree.out
index 035a81a..383b9be 100644
--- a/contrib/pageinspect/expected/btree.out
+++ b/contrib/pageinspect/expected/btree.out
@@ -34,6 +34,117 @@ btpo_flags    | 3
 
 SELECT * FROM bt_page_stats('test1_a_idx', 2);
 ERROR:  block number out of range
+-- bt_multi_page_stats() function returns a set of records of page statistics.
+CREATE TABLE test2 AS (SELECT generate_series(1, 5000) AS col1);
+CREATE INDEX test2_col1_idx ON test2(col1);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 0, 1);
+ERROR:  block 0 is a meta page
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, -1);
+ERROR:  block number out of range
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, 0);
+(0 rows)
+
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, 2);
+-[ RECORD 1 ]-+-----
+blkno         | 1
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 0
+btpo_next     | 2
+btpo_level    | 0
+btpo_flags    | 1
+-[ RECORD 2 ]-+-----
+blkno         | 2
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 1
+btpo_next     | 4
+btpo_level    | 0
+btpo_flags    | 1
+
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 2, 6);
+-[ RECORD 1 ]-+-----
+blkno         | 2
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 1
+btpo_next     | 4
+btpo_level    | 0
+btpo_flags    | 1
+-[ RECORD 2 ]-+-----
+blkno         | 3
+type          | r
+live_items    | 14
+dead_items    | 0
+avg_item_size | 15
+page_size     | 8192
+free_size     | 7876
+btpo_prev     | 0
+btpo_next     | 0
+btpo_level    | 1
+btpo_flags    | 2
+-[ RECORD 3 ]-+-----
+blkno         | 4
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 2
+btpo_next     | 5
+btpo_level    | 0
+btpo_flags    | 1
+-[ RECORD 4 ]-+-----
+blkno         | 5
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 4
+btpo_next     | 6
+btpo_level    | 0
+btpo_flags    | 1
+-[ RECORD 5 ]-+-----
+blkno         | 6
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 5
+btpo_next     | 7
+btpo_level    | 0
+btpo_flags    | 1
+-[ RECORD 6 ]-+-----
+blkno         | 7
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 6
+btpo_next     | 8
+btpo_level    | 0
+btpo_flags    | 1
+
+DROP TABLE test2;
 SELECT * FROM bt_page_items('test1_a_idx', -1);
 ERROR:  invalid block number
 SELECT * FROM bt_page_items('test1_a_idx', 0);
diff --git a/contrib/pageinspect/pageinspect--1.10--1.11.sql b/contrib/pageinspect/pageinspect--1.10--1.11.sql
index e69de29..976d029 100644
--- a/contrib/pageinspect/pageinspect--1.10--1.11.sql
+++ b/contrib/pageinspect/pageinspect--1.10--1.11.sql
@@ -0,0 +1,23 @@
+/* contrib/pageinspect/pageinspect--1.10--1.11.sql */
+
+-- complain if script is sourced in psql, rather than via ALTER EXTENSION
+\echo Use "ALTER EXTENSION pageinspect UPDATE TO '1.11'" to load this file. \quit
+
+--
+-- bt_multi_page_stats()
+--
+CREATE FUNCTION bt_multi_page_stats(IN relname text, IN blkno int8, IN blk_count int8,
+    OUT blkno int8,
+    OUT type "char",
+    OUT live_items int4,
+    OUT dead_items int4,
+    OUT avg_item_size int4,
+    OUT page_size int4,
+    OUT free_size int4,
+    OUT btpo_prev int8,
+    OUT btpo_next int8,
+    OUT btpo_level int8,
+    OUT btpo_flags int4)
+RETURNS SETOF record
+AS 'MODULE_PATHNAME', 'bt_multi_page_stats'
+LANGUAGE C STRICT PARALLEL SAFE;
diff --git a/contrib/pageinspect/pageinspect.control b/contrib/pageinspect/pageinspect.control
index 7cdf379..f277413 100644
--- a/contrib/pageinspect/pageinspect.control
+++ b/contrib/pageinspect/pageinspect.control
@@ -1,5 +1,5 @@
 # pageinspect extension
 comment = 'inspect the contents of database pages at a low level'
-default_version = '1.10'
+default_version = '1.11'
 module_pathname = '$libdir/pageinspect'
 relocatable = true
diff --git a/contrib/pageinspect/sql/btree.sql b/contrib/pageinspect/sql/btree.sql
index 1f554f0..9a95914 100644
--- a/contrib/pageinspect/sql/btree.sql
+++ b/contrib/pageinspect/sql/btree.sql
@@ -11,6 +11,16 @@ SELECT * FROM bt_page_stats('test1_a_idx', 0);
 SELECT * FROM bt_page_stats('test1_a_idx', 1);
 SELECT * FROM bt_page_stats('test1_a_idx', 2);
 
+-- bt_multi_page_stats() function returns a set of records of page statistics.
+CREATE TABLE test2 AS (SELECT generate_series(1, 5000) AS col1);
+CREATE INDEX test2_col1_idx ON test2(col1);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 0, 1);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, -1);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, 0);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, 2);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 2, 6);
+DROP TABLE test2;
+
 SELECT * FROM bt_page_items('test1_a_idx', -1);
 SELECT * FROM bt_page_items('test1_a_idx', 0);
 SELECT * FROM bt_page_items('test1_a_idx', 1);

diff --git a/contrib/pageinspect/Makefile b/contrib/pageinspect/Makefile
index 5c0736564a..069683caf6 100644
--- a/contrib/pageinspect/Makefile
+++ b/contrib/pageinspect/Makefile
@@ -13,7 +13,9 @@ OBJS = \
 	rawpage.o
 
 EXTENSION = pageinspect
-DATA =  pageinspect--1.9--1.10.sql pageinspect--1.8--1.9.sql \
+DATA = \
+	pageinspect--1.10--1.11.sql \
+	pageinspect--1.9--1.10.sql pageinspect--1.8--1.9.sql \
 	pageinspect--1.7--1.8.sql pageinspect--1.6--1.7.sql \
 	pageinspect--1.5.sql pageinspect--1.5--1.6.sql \
 	pageinspect--1.4--1.5.sql pageinspect--1.3--1.4.sql \
diff --git a/contrib/pageinspect/btreefuncs.c b/contrib/pageinspect/btreefuncs.c
index 9375d55e14..f52a6ac87e 100644
--- a/contrib/pageinspect/btreefuncs.c
+++ b/contrib/pageinspect/btreefuncs.c
@@ -46,6 +46,7 @@ PG_FUNCTION_INFO_V1(bt_page_items);
 PG_FUNCTION_INFO_V1(bt_page_items_bytea);
 PG_FUNCTION_INFO_V1(bt_page_stats_1_9);
 PG_FUNCTION_INFO_V1(bt_page_stats);
+PG_FUNCTION_INFO_V1(bt_multi_page_stats);
 
 #define IS_INDEX(r) ((r)->rd_rel->relkind == RELKIND_INDEX)
 #define IS_BTREE(r) ((r)->rd_rel->relam == BTREE_AM_OID)
@@ -80,6 +81,28 @@ typedef struct BTPageStat
 	BTCycleId	btpo_cycleid;
 } BTPageStat;
 
+/*
+ * cross-call data structure for SRF for page stats
+ */
+typedef struct ua_page_stats
+{
+	Oid			relid;
+	int64		blkno;
+	int64		blk_count;
+} ua_page_stats;
+
+/*
+ * cross-call data structure for SRF for page items
+ */
+typedef struct ua_page_items
+{
+	Page		page;
+	OffsetNumber offset;
+	bool		leafpage;
+	bool		rightmost;
+	TupleDesc	tupd;
+} ua_page_items;
+
 
 /* -------------------------------------------------
  * GetBTPageStatistics()
@@ -177,34 +200,15 @@ GetBTPageStatistics(BlockNumber blkno, Buffer buffer, BTPageStat *stat)
 }
 
 /* -----------------------------------------------
- * bt_page_stats()
+ * bt_index_block_validate()
  *
- * Usage: SELECT * FROM bt_page_stats('t1_pkey', 1);
+ * Validate index type is btree and block number
+ * is within a valid block number range.
  * -----------------------------------------------
  */
-static Datum
-bt_page_stats_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
+static void
+bt_index_block_validate(Relation rel, int64 blkno)
 {
-	text	   *relname = PG_GETARG_TEXT_PP(0);
-	int64		blkno = (ext_version == PAGEINSPECT_V1_8 ? PG_GETARG_UINT32(1) : PG_GETARG_INT64(1));
-	Buffer		buffer;
-	Relation	rel;
-	RangeVar   *relrv;
-	Datum		result;
-	HeapTuple	tuple;
-	TupleDesc	tupleDesc;
-	int			j;
-	char	   *values[11];
-	BTPageStat	stat;
-
-	if (!superuser())
-		ereport(ERROR,
-				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
-				 errmsg("must be superuser to use pageinspect functions")));
-
-	relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
-	rel = relation_openrv(relrv, AccessShareLock);
-
 	if (!IS_INDEX(rel) || !IS_BTREE(rel))
 		ereport(ERROR,
 				(errcode(ERRCODE_WRONG_OBJECT_TYPE),
@@ -232,6 +236,39 @@ bt_page_stats_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
 				 errmsg("block 0 is a meta page")));
 
 	CHECK_RELATION_BLOCK_RANGE(rel, blkno);
+}
+
+/* -----------------------------------------------
+ * bt_page_stats()
+ *
+ * Usage: SELECT * FROM bt_page_stats('t1_pkey', 1);
+ * Arguments are index relation name and block number
+ * -----------------------------------------------
+ */
+static Datum
+bt_page_stats_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
+{
+	text	   *relname = PG_GETARG_TEXT_PP(0);
+	int64		blkno = (ext_version == PAGEINSPECT_V1_8 ? PG_GETARG_UINT32(1) : PG_GETARG_INT64(1));
+	Buffer		buffer;
+	Relation	rel;
+	RangeVar   *relrv;
+	Datum		result;
+	HeapTuple	tuple;
+	TupleDesc	tupleDesc;
+	int			j;
+	char	   *values[11];
+	BTPageStat	stat;
+
+	if (!superuser())
+		ereport(ERROR,
+				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
+				 errmsg("must be superuser to use pageinspect functions")));
+
+	relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
+	rel = relation_openrv(relrv, AccessShareLock);
+
+	bt_index_block_validate(rel, blkno);
 
 	buffer = ReadBuffer(rel, blkno);
 	LockBuffer(buffer, BUFFER_LOCK_SHARE);
@@ -284,17 +321,134 @@ bt_page_stats(PG_FUNCTION_ARGS)
 }
 
 
-/*
- * cross-call data structure for SRF
+/* -----------------------------------------------
+ * bt_multi_page_stats()
+ *
+ * Usage: SELECT * FROM bt_page_stats('t1_pkey', 1, 2);
+ * Arguments are index relation name, first block number, number of blocks
+ * -----------------------------------------------
  */
-struct user_args
+Datum
+bt_multi_page_stats(PG_FUNCTION_ARGS)
 {
-	Page		page;
-	OffsetNumber offset;
-	bool		leafpage;
-	bool		rightmost;
-	TupleDesc	tupd;
-};
+	Relation	rel;
+	ua_page_stats *uargs;
+	FuncCallContext *fctx;
+	MemoryContext mctx;
+
+	if (!superuser())
+		ereport(ERROR,
+				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
+				 errmsg("must be superuser to use pageinspect functions")));
+
+	if (SRF_IS_FIRSTCALL())
+	{
+		text	   *relname = PG_GETARG_TEXT_PP(0);
+		int64		blkno = PG_GETARG_INT64(1);
+		int64		blk_count = PG_GETARG_INT64(2);
+		RangeVar   *relrv;
+
+		fctx = SRF_FIRSTCALL_INIT();
+
+		relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
+		rel = relation_openrv(relrv, AccessShareLock);
+
+		/* Check that rel is a valid btree index and 1st block number is OK */
+		bt_index_block_validate(rel, blkno);
+
+		/* Save arguments for reuse */
+		mctx = MemoryContextSwitchTo(fctx->multi_call_memory_ctx);
+
+		uargs = palloc(sizeof(ua_page_stats));
+
+		uargs->relid = RelationGetRelid(rel);
+		uargs->blkno = blkno;
+		uargs->blk_count = blk_count;
+
+		fctx->user_fctx = uargs;
+
+		MemoryContextSwitchTo(mctx);
+
+		/*
+		 * To avoid possibly leaking a relcache reference if the SRF isn't run
+		 * to completion, we close and re-open the index rel each time
+		 * through, using the index's OID for re-opens to ensure we get the
+		 * same rel.  Keep the AccessShareLock though, to ensure it doesn't go
+		 * away underneath us.
+		 */
+		relation_close(rel, NoLock);
+	}
+
+	fctx = SRF_PERCALL_SETUP();
+	uargs = fctx->user_fctx;
+
+	/* We need to fetch next block statistics */
+	if (uargs->blk_count > 0)
+	{
+		Buffer		buffer;
+		Datum		result;
+		HeapTuple	tuple;
+		int			j;
+		char	   *values[11];
+		BTPageStat	stat;
+		TupleDesc	tupleDesc;
+
+		/* We should have lock already */
+		rel = relation_open(uargs->relid, NoLock);
+
+		/*
+		 * Check that the next block number is valid --- we could have stepped
+		 * off the end, or index could have gotten shorter.
+		 */
+		CHECK_RELATION_BLOCK_RANGE(rel, uargs->blkno);
+
+		buffer = ReadBuffer(rel, uargs->blkno);
+		LockBuffer(buffer, BUFFER_LOCK_SHARE);
+
+		/* keep compiler quiet */
+		stat.btpo_prev = stat.btpo_next = InvalidBlockNumber;
+		stat.btpo_flags = stat.free_size = stat.avg_item_size = 0;
+
+		GetBTPageStatistics(uargs->blkno, buffer, &stat);
+
+		UnlockReleaseBuffer(buffer);
+		relation_close(rel, NoLock);
+
+		/* Build a tuple descriptor for our result type */
+		if (get_call_result_type(fcinfo, NULL, &tupleDesc) != TYPEFUNC_COMPOSITE)
+			elog(ERROR, "return type must be a row type");
+
+		j = 0;
+		values[j++] = psprintf("%u", stat.blkno);
+		values[j++] = psprintf("%c", stat.type);
+		values[j++] = psprintf("%u", stat.live_items);
+		values[j++] = psprintf("%u", stat.dead_items);
+		values[j++] = psprintf("%u", stat.avg_item_size);
+		values[j++] = psprintf("%u", stat.page_size);
+		values[j++] = psprintf("%u", stat.free_size);
+		values[j++] = psprintf("%u", stat.btpo_prev);
+		values[j++] = psprintf("%u", stat.btpo_next);
+		values[j++] = psprintf("%u", stat.btpo_level);
+		values[j++] = psprintf("%d", stat.btpo_flags);
+
+		/* Construct tuple to be returned */
+		tuple = BuildTupleFromCStrings(TupleDescGetAttInMetadata(tupleDesc),
+									   values);
+
+		result = HeapTupleGetDatum(tuple);
+
+		/*
+		 * Move to the next block number and decrement the number of blocks
+		 * still to be fetched
+		 */
+		uargs->blkno++;
+		uargs->blk_count--;
+
+		SRF_RETURN_NEXT(fctx, result);
+	}
+
+	SRF_RETURN_DONE(fctx);
+}
 
 /*-------------------------------------------------------
  * bt_page_print_tuples()
@@ -303,7 +457,7 @@ struct user_args
  * ------------------------------------------------------
  */
 static Datum
-bt_page_print_tuples(struct user_args *uargs)
+bt_page_print_tuples(ua_page_items *uargs)
 {
 	Page		page = uargs->page;
 	OffsetNumber offset = uargs->offset;
@@ -453,7 +607,7 @@ bt_page_items_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
 	Datum		result;
 	FuncCallContext *fctx;
 	MemoryContext mctx;
-	struct user_args *uargs;
+	ua_page_items *uargs;
 
 	if (!superuser())
 		ereport(ERROR,
@@ -473,33 +627,7 @@ bt_page_items_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
 		relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
 		rel = relation_openrv(relrv, AccessShareLock);
 
-		if (!IS_INDEX(rel) || !IS_BTREE(rel))
-			ereport(ERROR,
-					(errcode(ERRCODE_WRONG_OBJECT_TYPE),
-					 errmsg("\"%s\" is not a %s index",
-							RelationGetRelationName(rel), "btree")));
-
-		/*
-		 * Reject attempts to read non-local temporary relations; we would be
-		 * likely to get wrong data since we have no visibility into the
-		 * owning session's local buffers.
-		 */
-		if (RELATION_IS_OTHER_TEMP(rel))
-			ereport(ERROR,
-					(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
-					 errmsg("cannot access temporary tables of other sessions")));
-
-		if (blkno < 0 || blkno > MaxBlockNumber)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("invalid block number")));
-
-		if (blkno == 0)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("block 0 is a meta page")));
-
-		CHECK_RELATION_BLOCK_RANGE(rel, blkno);
+		bt_index_block_validate(rel, blkno);
 
 		buffer = ReadBuffer(rel, blkno);
 		LockBuffer(buffer, BUFFER_LOCK_SHARE);
@@ -511,7 +639,7 @@ bt_page_items_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
 		 */
 		mctx = MemoryContextSwitchTo(fctx->multi_call_memory_ctx);
 
-		uargs = palloc(sizeof(struct user_args));
+		uargs = palloc(sizeof(ua_page_items));
 
 		uargs->page = palloc(BLCKSZ);
 		memcpy(uargs->page, BufferGetPage(buffer), BLCKSZ);
@@ -587,7 +715,7 @@ bt_page_items_bytea(PG_FUNCTION_ARGS)
 	bytea	   *raw_page = PG_GETARG_BYTEA_P(0);
 	Datum		result;
 	FuncCallContext *fctx;
-	struct user_args *uargs;
+	ua_page_items *uargs;
 
 	if (!superuser())
 		ereport(ERROR,
@@ -603,7 +731,7 @@ bt_page_items_bytea(PG_FUNCTION_ARGS)
 		fctx = SRF_FIRSTCALL_INIT();
 		mctx = MemoryContextSwitchTo(fctx->multi_call_memory_ctx);
 
-		uargs = palloc(sizeof(struct user_args));
+		uargs = palloc(sizeof(ua_page_items));
 
 		uargs->page = get_page_from_raw(raw_page);
 
diff --git a/contrib/pageinspect/expected/btree.out b/contrib/pageinspect/expected/btree.out
index 035a81a759..de747f1751 100644
--- a/contrib/pageinspect/expected/btree.out
+++ b/contrib/pageinspect/expected/btree.out
@@ -34,6 +34,118 @@ btpo_flags    | 3
 
 SELECT * FROM bt_page_stats('test1_a_idx', 2);
 ERROR:  block number out of range
+-- bt_multi_page_stats() function returns a set of records of page statistics.
+CREATE TABLE test2 AS (SELECT generate_series(1, 5000) AS col1);
+CREATE INDEX test2_col1_idx ON test2(col1);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 0, 1);
+ERROR:  block 0 is a meta page
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, -1);
+(0 rows)
+
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, 0);
+(0 rows)
+
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, 2);
+-[ RECORD 1 ]-+-----
+blkno         | 1
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 0
+btpo_next     | 2
+btpo_level    | 0
+btpo_flags    | 1
+-[ RECORD 2 ]-+-----
+blkno         | 2
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 1
+btpo_next     | 4
+btpo_level    | 0
+btpo_flags    | 1
+
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 2, 6);
+-[ RECORD 1 ]-+-----
+blkno         | 2
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 1
+btpo_next     | 4
+btpo_level    | 0
+btpo_flags    | 1
+-[ RECORD 2 ]-+-----
+blkno         | 3
+type          | r
+live_items    | 14
+dead_items    | 0
+avg_item_size | 15
+page_size     | 8192
+free_size     | 7876
+btpo_prev     | 0
+btpo_next     | 0
+btpo_level    | 1
+btpo_flags    | 2
+-[ RECORD 3 ]-+-----
+blkno         | 4
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 2
+btpo_next     | 5
+btpo_level    | 0
+btpo_flags    | 1
+-[ RECORD 4 ]-+-----
+blkno         | 5
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 4
+btpo_next     | 6
+btpo_level    | 0
+btpo_flags    | 1
+-[ RECORD 5 ]-+-----
+blkno         | 6
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 5
+btpo_next     | 7
+btpo_level    | 0
+btpo_flags    | 1
+-[ RECORD 6 ]-+-----
+blkno         | 7
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 6
+btpo_next     | 8
+btpo_level    | 0
+btpo_flags    | 1
+
+DROP TABLE test2;
 SELECT * FROM bt_page_items('test1_a_idx', -1);
 ERROR:  invalid block number
 SELECT * FROM bt_page_items('test1_a_idx', 0);
diff --git a/contrib/pageinspect/pageinspect--1.10--1.11.sql b/contrib/pageinspect/pageinspect--1.10--1.11.sql
new file mode 100644
index 0000000000..976d029de9
--- /dev/null
+++ b/contrib/pageinspect/pageinspect--1.10--1.11.sql
@@ -0,0 +1,23 @@
+/* contrib/pageinspect/pageinspect--1.10--1.11.sql */
+
+-- complain if script is sourced in psql, rather than via ALTER EXTENSION
+\echo Use "ALTER EXTENSION pageinspect UPDATE TO '1.11'" to load this file. \quit
+
+--
+-- bt_multi_page_stats()
+--
+CREATE FUNCTION bt_multi_page_stats(IN relname text, IN blkno int8, IN blk_count int8,
+    OUT blkno int8,
+    OUT type "char",
+    OUT live_items int4,
+    OUT dead_items int4,
+    OUT avg_item_size int4,
+    OUT page_size int4,
+    OUT free_size int4,
+    OUT btpo_prev int8,
+    OUT btpo_next int8,
+    OUT btpo_level int8,
+    OUT btpo_flags int4)
+RETURNS SETOF record
+AS 'MODULE_PATHNAME', 'bt_multi_page_stats'
+LANGUAGE C STRICT PARALLEL SAFE;
diff --git a/contrib/pageinspect/pageinspect.control b/contrib/pageinspect/pageinspect.control
index 7cdf37913d..f277413dd8 100644
--- a/contrib/pageinspect/pageinspect.control
+++ b/contrib/pageinspect/pageinspect.control
@@ -1,5 +1,5 @@
 # pageinspect extension
 comment = 'inspect the contents of database pages at a low level'
-default_version = '1.10'
+default_version = '1.11'
 module_pathname = '$libdir/pageinspect'
 relocatable = true
diff --git a/contrib/pageinspect/sql/btree.sql b/contrib/pageinspect/sql/btree.sql
index 1f554f0f67..9a959142cd 100644
--- a/contrib/pageinspect/sql/btree.sql
+++ b/contrib/pageinspect/sql/btree.sql
@@ -11,6 +11,16 @@ SELECT * FROM bt_page_stats('test1_a_idx', 0);
 SELECT * FROM bt_page_stats('test1_a_idx', 1);
 SELECT * FROM bt_page_stats('test1_a_idx', 2);
 
+-- bt_multi_page_stats() function returns a set of records of page statistics.
+CREATE TABLE test2 AS (SELECT generate_series(1, 5000) AS col1);
+CREATE INDEX test2_col1_idx ON test2(col1);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 0, 1);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, -1);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, 0);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, 2);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 2, 6);
+DROP TABLE test2;
+
 SELECT * FROM bt_page_items('test1_a_idx', -1);
 SELECT * FROM bt_page_items('test1_a_idx', 0);
 SELECT * FROM bt_page_items('test1_a_idx', 1);

diff --git a/contrib/pageinspect/Makefile b/contrib/pageinspect/Makefile
index 5c0736564a..069683caf6 100644
--- a/contrib/pageinspect/Makefile
+++ b/contrib/pageinspect/Makefile
@@ -13,7 +13,9 @@ OBJS = \
 	rawpage.o
 
 EXTENSION = pageinspect
-DATA =  pageinspect--1.9--1.10.sql pageinspect--1.8--1.9.sql \
+DATA = \
+	pageinspect--1.10--1.11.sql \
+	pageinspect--1.9--1.10.sql pageinspect--1.8--1.9.sql \
 	pageinspect--1.7--1.8.sql pageinspect--1.6--1.7.sql \
 	pageinspect--1.5.sql pageinspect--1.5--1.6.sql \
 	pageinspect--1.4--1.5.sql pageinspect--1.3--1.4.sql \
diff --git a/contrib/pageinspect/btreefuncs.c b/contrib/pageinspect/btreefuncs.c
index 9375d55e14..53e5f5921f 100644
--- a/contrib/pageinspect/btreefuncs.c
+++ b/contrib/pageinspect/btreefuncs.c
@@ -46,6 +46,7 @@ PG_FUNCTION_INFO_V1(bt_page_items);
 PG_FUNCTION_INFO_V1(bt_page_items_bytea);
 PG_FUNCTION_INFO_V1(bt_page_stats_1_9);
 PG_FUNCTION_INFO_V1(bt_page_stats);
+PG_FUNCTION_INFO_V1(bt_multi_page_stats);
 
 #define IS_INDEX(r) ((r)->rd_rel->relkind == RELKIND_INDEX)
 #define IS_BTREE(r) ((r)->rd_rel->relam == BTREE_AM_OID)
@@ -55,7 +56,7 @@ PG_FUNCTION_INFO_V1(bt_page_stats);
 /* note: BlockNumber is unsigned, hence can't be negative */
 #define CHECK_RELATION_BLOCK_RANGE(rel, blkno) { \
 		if ( RelationGetNumberOfBlocks(rel) <= (BlockNumber) (blkno) ) \
-			 elog(ERROR, "block number out of range"); }
+			 elog(ERROR, "block number " INT64_FORMAT " is out of range", blkno); }
 
 /* ------------------------------------------------
  * structure for single btree page statistics
@@ -80,6 +81,29 @@ typedef struct BTPageStat
 	BTCycleId	btpo_cycleid;
 } BTPageStat;
 
+/*
+ * cross-call data structure for SRF for page stats
+ */
+typedef struct ua_page_stats
+{
+	Oid			relid;
+	int64		blkno;
+	int64		blk_count;
+	bool		allpages;
+} ua_page_stats;
+
+/*
+ * cross-call data structure for SRF for page items
+ */
+typedef struct ua_page_items
+{
+	Page		page;
+	OffsetNumber offset;
+	bool		leafpage;
+	bool		rightmost;
+	TupleDesc	tupd;
+} ua_page_items;
+
 
 /* -------------------------------------------------
  * GetBTPageStatistics()
@@ -177,34 +201,15 @@ GetBTPageStatistics(BlockNumber blkno, Buffer buffer, BTPageStat *stat)
 }
 
 /* -----------------------------------------------
- * bt_page_stats()
+ * bt_index_block_validate()
  *
- * Usage: SELECT * FROM bt_page_stats('t1_pkey', 1);
+ * Validate index type is btree and block number
+ * is within a valid block number range.
  * -----------------------------------------------
  */
-static Datum
-bt_page_stats_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
+static void
+bt_index_block_validate(Relation rel, int64 blkno)
 {
-	text	   *relname = PG_GETARG_TEXT_PP(0);
-	int64		blkno = (ext_version == PAGEINSPECT_V1_8 ? PG_GETARG_UINT32(1) : PG_GETARG_INT64(1));
-	Buffer		buffer;
-	Relation	rel;
-	RangeVar   *relrv;
-	Datum		result;
-	HeapTuple	tuple;
-	TupleDesc	tupleDesc;
-	int			j;
-	char	   *values[11];
-	BTPageStat	stat;
-
-	if (!superuser())
-		ereport(ERROR,
-				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
-				 errmsg("must be superuser to use pageinspect functions")));
-
-	relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
-	rel = relation_openrv(relrv, AccessShareLock);
-
 	if (!IS_INDEX(rel) || !IS_BTREE(rel))
 		ereport(ERROR,
 				(errcode(ERRCODE_WRONG_OBJECT_TYPE),
@@ -232,6 +237,39 @@ bt_page_stats_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
 				 errmsg("block 0 is a meta page")));
 
 	CHECK_RELATION_BLOCK_RANGE(rel, blkno);
+}
+
+/* -----------------------------------------------
+ * bt_page_stats()
+ *
+ * Usage: SELECT * FROM bt_page_stats('t1_pkey', 1);
+ * Arguments are index relation name and block number
+ * -----------------------------------------------
+ */
+static Datum
+bt_page_stats_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
+{
+	text	   *relname = PG_GETARG_TEXT_PP(0);
+	int64		blkno = (ext_version == PAGEINSPECT_V1_8 ? PG_GETARG_UINT32(1) : PG_GETARG_INT64(1));
+	Buffer		buffer;
+	Relation	rel;
+	RangeVar   *relrv;
+	Datum		result;
+	HeapTuple	tuple;
+	TupleDesc	tupleDesc;
+	int			j;
+	char	   *values[11];
+	BTPageStat	stat;
+
+	if (!superuser())
+		ereport(ERROR,
+				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
+				 errmsg("must be superuser to use pageinspect functions")));
+
+	relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
+	rel = relation_openrv(relrv, AccessShareLock);
+
+	bt_index_block_validate(rel, blkno);
 
 	buffer = ReadBuffer(rel, blkno);
 	LockBuffer(buffer, BUFFER_LOCK_SHARE);
@@ -284,17 +322,145 @@ bt_page_stats(PG_FUNCTION_ARGS)
 }
 
 
-/*
- * cross-call data structure for SRF
+/* -----------------------------------------------
+ * bt_multi_page_stats()
+ *
+ * Usage: SELECT * FROM bt_page_stats('t1_pkey', 1, 2);
+ * Arguments are index relation name, first block number, number of blocks
+ * -----------------------------------------------
  */
-struct user_args
+Datum
+bt_multi_page_stats(PG_FUNCTION_ARGS)
 {
-	Page		page;
-	OffsetNumber offset;
-	bool		leafpage;
-	bool		rightmost;
-	TupleDesc	tupd;
-};
+	Relation	rel;
+	ua_page_stats *uargs;
+	FuncCallContext *fctx;
+	MemoryContext mctx;
+
+	if (!superuser())
+		ereport(ERROR,
+				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
+				 errmsg("must be superuser to use pageinspect functions")));
+
+	if (SRF_IS_FIRSTCALL())
+	{
+		text	   *relname = PG_GETARG_TEXT_PP(0);
+		int64		blkno = PG_GETARG_INT64(1);
+		int64		blk_count = PG_GETARG_INT64(2);
+		RangeVar   *relrv;
+
+		fctx = SRF_FIRSTCALL_INIT();
+
+		relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
+		rel = relation_openrv(relrv, AccessShareLock);
+
+		/* Check that rel is a valid btree index and 1st block number is OK */
+		bt_index_block_validate(rel, blkno);
+
+		/*
+		 * Check if upperbound of the specified range is valid. If only one
+		 * page is requested, skip as we've already validated the page.
+		 */
+		if (blk_count > 1)
+			CHECK_RELATION_BLOCK_RANGE(rel, blkno + blk_count - 1);
+
+		/* Save arguments for reuse */
+		mctx = MemoryContextSwitchTo(fctx->multi_call_memory_ctx);
+
+		uargs = palloc(sizeof(ua_page_stats));
+
+		uargs->relid = RelationGetRelid(rel);
+		uargs->blkno = blkno;
+		uargs->allpages = (blk_count < 0);
+
+		if (uargs->allpages)
+			uargs->blk_count = RelationGetNumberOfBlocks(rel) - uargs->blkno;
+		else
+			uargs->blk_count = blk_count;
+
+		fctx->user_fctx = uargs;
+
+		MemoryContextSwitchTo(mctx);
+
+		/*
+		 * To avoid possibly leaking a relcache reference if the SRF isn't run
+		 * to completion, we close and re-open the index rel each time
+		 * through, using the index's OID for re-opens to ensure we get the
+		 * same rel.  Keep the AccessShareLock though, to ensure it doesn't go
+		 * away underneath us.
+		 */
+		relation_close(rel, NoLock);
+	}
+
+	fctx = SRF_PERCALL_SETUP();
+	uargs = fctx->user_fctx;
+
+
+	/* We should have lock already */
+	rel = relation_open(uargs->relid, NoLock);
+
+	if (uargs->allpages)
+		uargs->blk_count = RelationGetNumberOfBlocks(rel) - uargs->blkno;
+
+	/* We need to fetch next block statistics */
+	if (uargs->blk_count > 0)
+	{
+		Buffer		buffer;
+		Datum		result;
+		HeapTuple	tuple;
+		int			j;
+		char	   *values[11];
+		BTPageStat	stat;
+		TupleDesc	tupleDesc;
+
+		buffer = ReadBuffer(rel, uargs->blkno);
+		LockBuffer(buffer, BUFFER_LOCK_SHARE);
+
+		/* keep compiler quiet */
+		stat.btpo_prev = stat.btpo_next = InvalidBlockNumber;
+		stat.btpo_flags = stat.free_size = stat.avg_item_size = 0;
+
+		GetBTPageStatistics(uargs->blkno, buffer, &stat);
+
+		UnlockReleaseBuffer(buffer);
+		relation_close(rel, NoLock);
+
+		/* Build a tuple descriptor for our result type */
+		if (get_call_result_type(fcinfo, NULL, &tupleDesc) != TYPEFUNC_COMPOSITE)
+			elog(ERROR, "return type must be a row type");
+
+		j = 0;
+		values[j++] = psprintf("%u", stat.blkno);
+		values[j++] = psprintf("%c", stat.type);
+		values[j++] = psprintf("%u", stat.live_items);
+		values[j++] = psprintf("%u", stat.dead_items);
+		values[j++] = psprintf("%u", stat.avg_item_size);
+		values[j++] = psprintf("%u", stat.page_size);
+		values[j++] = psprintf("%u", stat.free_size);
+		values[j++] = psprintf("%u", stat.btpo_prev);
+		values[j++] = psprintf("%u", stat.btpo_next);
+		values[j++] = psprintf("%u", stat.btpo_level);
+		values[j++] = psprintf("%d", stat.btpo_flags);
+
+		/* Construct tuple to be returned */
+		tuple = BuildTupleFromCStrings(TupleDescGetAttInMetadata(tupleDesc),
+									   values);
+
+		result = HeapTupleGetDatum(tuple);
+
+		/*
+		 * Move to the next block number and decrement the number of blocks
+		 * still to be fetched
+		 */
+		uargs->blkno++;
+		uargs->blk_count--;
+
+		SRF_RETURN_NEXT(fctx, result);
+	}
+
+	relation_close(rel, NoLock);
+	SRF_RETURN_DONE(fctx);
+}
 
 /*-------------------------------------------------------
  * bt_page_print_tuples()
@@ -303,7 +469,7 @@ struct user_args
  * ------------------------------------------------------
  */
 static Datum
-bt_page_print_tuples(struct user_args *uargs)
+bt_page_print_tuples(ua_page_items *uargs)
 {
 	Page		page = uargs->page;
 	OffsetNumber offset = uargs->offset;
@@ -453,7 +619,7 @@ bt_page_items_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
 	Datum		result;
 	FuncCallContext *fctx;
 	MemoryContext mctx;
-	struct user_args *uargs;
+	ua_page_items *uargs;
 
 	if (!superuser())
 		ereport(ERROR,
@@ -473,33 +639,7 @@ bt_page_items_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
 		relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
 		rel = relation_openrv(relrv, AccessShareLock);
 
-		if (!IS_INDEX(rel) || !IS_BTREE(rel))
-			ereport(ERROR,
-					(errcode(ERRCODE_WRONG_OBJECT_TYPE),
-					 errmsg("\"%s\" is not a %s index",
-							RelationGetRelationName(rel), "btree")));
-
-		/*
-		 * Reject attempts to read non-local temporary relations; we would be
-		 * likely to get wrong data since we have no visibility into the
-		 * owning session's local buffers.
-		 */
-		if (RELATION_IS_OTHER_TEMP(rel))
-			ereport(ERROR,
-					(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
-					 errmsg("cannot access temporary tables of other sessions")));
-
-		if (blkno < 0 || blkno > MaxBlockNumber)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("invalid block number")));
-
-		if (blkno == 0)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("block 0 is a meta page")));
-
-		CHECK_RELATION_BLOCK_RANGE(rel, blkno);
+		bt_index_block_validate(rel, blkno);
 
 		buffer = ReadBuffer(rel, blkno);
 		LockBuffer(buffer, BUFFER_LOCK_SHARE);
@@ -511,7 +651,7 @@ bt_page_items_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
 		 */
 		mctx = MemoryContextSwitchTo(fctx->multi_call_memory_ctx);
 
-		uargs = palloc(sizeof(struct user_args));
+		uargs = palloc(sizeof(ua_page_items));
 
 		uargs->page = palloc(BLCKSZ);
 		memcpy(uargs->page, BufferGetPage(buffer), BLCKSZ);
@@ -587,7 +727,7 @@ bt_page_items_bytea(PG_FUNCTION_ARGS)
 	bytea	   *raw_page = PG_GETARG_BYTEA_P(0);
 	Datum		result;
 	FuncCallContext *fctx;
-	struct user_args *uargs;
+	ua_page_items *uargs;
 
 	if (!superuser())
 		ereport(ERROR,
@@ -603,7 +743,7 @@ bt_page_items_bytea(PG_FUNCTION_ARGS)
 		fctx = SRF_FIRSTCALL_INIT();
 		mctx = MemoryContextSwitchTo(fctx->multi_call_memory_ctx);
 
-		uargs = palloc(sizeof(struct user_args));
+		uargs = palloc(sizeof(ua_page_items));
 
 		uargs->page = get_page_from_raw(raw_page);
 
diff --git a/contrib/pageinspect/expected/btree.out b/contrib/pageinspect/expected/btree.out
index 035a81a759..97f2f4e2fa 100644
--- a/contrib/pageinspect/expected/btree.out
+++ b/contrib/pageinspect/expected/btree.out
@@ -33,7 +33,120 @@ btpo_level    | 0
 btpo_flags    | 3
 
 SELECT * FROM bt_page_stats('test1_a_idx', 2);
-ERROR:  block number out of range
+ERROR:  block number 2 is out of range
+-- bt_multi_page_stats() function returns a set of records of page statistics.
+CREATE TABLE test2 AS (SELECT generate_series(1, 1000)::int8 AS col1);
+CREATE INDEX test2_col1_idx ON test2(col1);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 0, 1);
+ERROR:  block 0 is a meta page
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, -1);
+-[ RECORD 1 ]-+-----
+blkno         | 1
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 0
+btpo_next     | 2
+btpo_level    | 0
+btpo_flags    | 1
+-[ RECORD 2 ]-+-----
+blkno         | 2
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 1
+btpo_next     | 4
+btpo_level    | 0
+btpo_flags    | 1
+-[ RECORD 3 ]-+-----
+blkno         | 3
+type          | r
+live_items    | 3
+dead_items    | 0
+avg_item_size | 13
+page_size     | 8192
+free_size     | 8096
+btpo_prev     | 0
+btpo_next     | 0
+btpo_level    | 1
+btpo_flags    | 2
+-[ RECORD 4 ]-+-----
+blkno         | 4
+type          | l
+live_items    | 268
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 2788
+btpo_prev     | 2
+btpo_next     | 0
+btpo_level    | 0
+btpo_flags    | 1
+
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, 0);
+(0 rows)
+
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, 2);
+-[ RECORD 1 ]-+-----
+blkno         | 1
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 0
+btpo_next     | 2
+btpo_level    | 0
+btpo_flags    | 1
+-[ RECORD 2 ]-+-----
+blkno         | 2
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 1
+btpo_next     | 4
+btpo_level    | 0
+btpo_flags    | 1
+
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 3, 2);
+-[ RECORD 1 ]-+-----
+blkno         | 3
+type          | r
+live_items    | 3
+dead_items    | 0
+avg_item_size | 13
+page_size     | 8192
+free_size     | 8096
+btpo_prev     | 0
+btpo_next     | 0
+btpo_level    | 1
+btpo_flags    | 2
+-[ RECORD 2 ]-+-----
+blkno         | 4
+type          | l
+live_items    | 268
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 2788
+btpo_prev     | 2
+btpo_next     | 0
+btpo_level    | 0
+btpo_flags    | 1
+
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 7, 2);
+ERROR:  block number 7 is out of range
+DROP TABLE test2;
 SELECT * FROM bt_page_items('test1_a_idx', -1);
 ERROR:  invalid block number
 SELECT * FROM bt_page_items('test1_a_idx', 0);
@@ -51,7 +164,7 @@ htid       | (0,1)
 tids       | 
 
 SELECT * FROM bt_page_items('test1_a_idx', 2);
-ERROR:  block number out of range
+ERROR:  block number 2 is out of range
 SELECT * FROM bt_page_items(get_raw_page('test1_a_idx', -1));
 ERROR:  invalid block number
 SELECT * FROM bt_page_items(get_raw_page('test1_a_idx', 0));
diff --git a/contrib/pageinspect/pageinspect--1.10--1.11.sql b/contrib/pageinspect/pageinspect--1.10--1.11.sql
new file mode 100644
index 0000000000..976d029de9
--- /dev/null
+++ b/contrib/pageinspect/pageinspect--1.10--1.11.sql
@@ -0,0 +1,23 @@
+/* contrib/pageinspect/pageinspect--1.10--1.11.sql */
+
+-- complain if script is sourced in psql, rather than via ALTER EXTENSION
+\echo Use "ALTER EXTENSION pageinspect UPDATE TO '1.11'" to load this file. \quit
+
+--
+-- bt_multi_page_stats()
+--
+CREATE FUNCTION bt_multi_page_stats(IN relname text, IN blkno int8, IN blk_count int8,
+    OUT blkno int8,
+    OUT type "char",
+    OUT live_items int4,
+    OUT dead_items int4,
+    OUT avg_item_size int4,
+    OUT page_size int4,
+    OUT free_size int4,
+    OUT btpo_prev int8,
+    OUT btpo_next int8,
+    OUT btpo_level int8,
+    OUT btpo_flags int4)
+RETURNS SETOF record
+AS 'MODULE_PATHNAME', 'bt_multi_page_stats'
+LANGUAGE C STRICT PARALLEL SAFE;
diff --git a/contrib/pageinspect/pageinspect.control b/contrib/pageinspect/pageinspect.control
index 7cdf37913d..f277413dd8 100644
--- a/contrib/pageinspect/pageinspect.control
+++ b/contrib/pageinspect/pageinspect.control
@@ -1,5 +1,5 @@
 # pageinspect extension
 comment = 'inspect the contents of database pages at a low level'
-default_version = '1.10'
+default_version = '1.11'
 module_pathname = '$libdir/pageinspect'
 relocatable = true
diff --git a/contrib/pageinspect/sql/btree.sql b/contrib/pageinspect/sql/btree.sql
index 1f554f0f67..102ebdefe3 100644
--- a/contrib/pageinspect/sql/btree.sql
+++ b/contrib/pageinspect/sql/btree.sql
@@ -11,6 +11,17 @@ SELECT * FROM bt_page_stats('test1_a_idx', 0);
 SELECT * FROM bt_page_stats('test1_a_idx', 1);
 SELECT * FROM bt_page_stats('test1_a_idx', 2);
 
+-- bt_multi_page_stats() function returns a set of records of page statistics.
+CREATE TABLE test2 AS (SELECT generate_series(1, 1000)::int8 AS col1);
+CREATE INDEX test2_col1_idx ON test2(col1);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 0, 1);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, -1);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, 0);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, 2);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 3, 2);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 7, 2);
+DROP TABLE test2;
+
 SELECT * FROM bt_page_items('test1_a_idx', -1);
 SELECT * FROM bt_page_items('test1_a_idx', 0);
 SELECT * FROM bt_page_items('test1_a_idx', 1);
diff --git a/doc/src/sgml/pageinspect.sgml b/doc/src/sgml/pageinspect.sgml
index d4ee34ee0f..cf267424e9 100644
--- a/doc/src/sgml/pageinspect.sgml
+++ b/doc/src/sgml/pageinspect.sgml
@@ -346,6 +346,53 @@ btpo_flags    | 3
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term>
+     <function>bt_multi_page_stats(relname text, blkno bigint, blk_count bigint) returns setof record</function>
+     <indexterm>
+      <primary>bt_multi_page_stats</primary>
+     </indexterm>
+    </term>
+
+    <listitem>
+     <para>
+      <function>bt_multi_page_stats</function> returns summary information
+      about the <structfield>blk_count</structfield> number of B-tree index
+      pages starting from <structfield>blkno</structfield> page.  A value of
+      <literal>-1</literal> for <structfield>blk_count</structfield> returns
+      summary information for all index pages starting from
+      <structfield>blkno</structfield> page.  For example:
+<screen>
+test=# SELECT * FROM bt_multi_page_stats('pg_proc_oid_index', 5, 2);
+-[ RECORD 1 ]-+-----
+blkno         | 5
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 4
+btpo_next     | 6
+btpo_level    | 0
+btpo_flags    | 1
+-[ RECORD 2 ]-+-----
+blkno         | 6
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 5
+btpo_next     | 7
+btpo_level    | 0
+btpo_flags    | 1
+</screen>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term>
      <function>bt_page_items(relname text, blkno bigint) returns setof record</function>

diff --git a/contrib/pageinspect/Makefile b/contrib/pageinspect/Makefile
index ad5a3ac511..95e030b396 100644
--- a/contrib/pageinspect/Makefile
+++ b/contrib/pageinspect/Makefile
@@ -13,7 +13,7 @@ OBJS = \
 	rawpage.o
 
 EXTENSION = pageinspect
-DATA =  pageinspect--1.10--1.11.sql \
+DATA =  pageinspect--1.11--1.12.sql pageinspect--1.10--1.11.sql \
 	pageinspect--1.9--1.10.sql pageinspect--1.8--1.9.sql \
 	pageinspect--1.7--1.8.sql pageinspect--1.6--1.7.sql \
 	pageinspect--1.5.sql pageinspect--1.5--1.6.sql \
diff --git a/contrib/pageinspect/btreefuncs.c b/contrib/pageinspect/btreefuncs.c
index 9375d55e14..e2cbed7377 100644
--- a/contrib/pageinspect/btreefuncs.c
+++ b/contrib/pageinspect/btreefuncs.c
@@ -46,6 +46,7 @@ PG_FUNCTION_INFO_V1(bt_page_items);
 PG_FUNCTION_INFO_V1(bt_page_items_bytea);
 PG_FUNCTION_INFO_V1(bt_page_stats_1_9);
 PG_FUNCTION_INFO_V1(bt_page_stats);
+PG_FUNCTION_INFO_V1(bt_multi_page_stats);
 
 #define IS_INDEX(r) ((r)->rd_rel->relkind == RELKIND_INDEX)
 #define IS_BTREE(r) ((r)->rd_rel->relam == BTREE_AM_OID)
@@ -55,7 +56,7 @@ PG_FUNCTION_INFO_V1(bt_page_stats);
 /* note: BlockNumber is unsigned, hence can't be negative */
 #define CHECK_RELATION_BLOCK_RANGE(rel, blkno) { \
 		if ( RelationGetNumberOfBlocks(rel) <= (BlockNumber) (blkno) ) \
-			 elog(ERROR, "block number out of range"); }
+			 elog(ERROR, "block number " INT64_FORMAT " is out of range", blkno); }
 
 /* ------------------------------------------------
  * structure for single btree page statistics
@@ -80,6 +81,29 @@ typedef struct BTPageStat
 	BTCycleId	btpo_cycleid;
 } BTPageStat;
 
+/*
+ * cross-call data structure for SRF for page stats
+ */
+typedef struct ua_page_stats
+{
+	Oid			relid;
+	int64		blkno;
+	int64		blk_count;
+	bool		allpages;
+} ua_page_stats;
+
+/*
+ * cross-call data structure for SRF for page items
+ */
+typedef struct ua_page_items
+{
+	Page		page;
+	OffsetNumber offset;
+	bool		leafpage;
+	bool		rightmost;
+	TupleDesc	tupd;
+} ua_page_items;
+
 
 /* -------------------------------------------------
  * GetBTPageStatistics()
@@ -177,34 +201,15 @@ GetBTPageStatistics(BlockNumber blkno, Buffer buffer, BTPageStat *stat)
 }
 
 /* -----------------------------------------------
- * bt_page_stats()
+ * bt_index_block_validate()
  *
- * Usage: SELECT * FROM bt_page_stats('t1_pkey', 1);
+ * Validate index type is btree and block number
+ * is within a valid block number range.
  * -----------------------------------------------
  */
-static Datum
-bt_page_stats_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
+static void
+bt_index_block_validate(Relation rel, int64 blkno)
 {
-	text	   *relname = PG_GETARG_TEXT_PP(0);
-	int64		blkno = (ext_version == PAGEINSPECT_V1_8 ? PG_GETARG_UINT32(1) : PG_GETARG_INT64(1));
-	Buffer		buffer;
-	Relation	rel;
-	RangeVar   *relrv;
-	Datum		result;
-	HeapTuple	tuple;
-	TupleDesc	tupleDesc;
-	int			j;
-	char	   *values[11];
-	BTPageStat	stat;
-
-	if (!superuser())
-		ereport(ERROR,
-				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
-				 errmsg("must be superuser to use pageinspect functions")));
-
-	relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
-	rel = relation_openrv(relrv, AccessShareLock);
-
 	if (!IS_INDEX(rel) || !IS_BTREE(rel))
 		ereport(ERROR,
 				(errcode(ERRCODE_WRONG_OBJECT_TYPE),
@@ -232,6 +237,39 @@ bt_page_stats_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
 				 errmsg("block 0 is a meta page")));
 
 	CHECK_RELATION_BLOCK_RANGE(rel, blkno);
+}
+
+/* -----------------------------------------------
+ * bt_page_stats()
+ *
+ * Usage: SELECT * FROM bt_page_stats('t1_pkey', 1);
+ * Arguments are index relation name and block number
+ * -----------------------------------------------
+ */
+static Datum
+bt_page_stats_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
+{
+	text	   *relname = PG_GETARG_TEXT_PP(0);
+	int64		blkno = (ext_version == PAGEINSPECT_V1_8 ? PG_GETARG_UINT32(1) : PG_GETARG_INT64(1));
+	Buffer		buffer;
+	Relation	rel;
+	RangeVar   *relrv;
+	Datum		result;
+	HeapTuple	tuple;
+	TupleDesc	tupleDesc;
+	int			j;
+	char	   *values[11];
+	BTPageStat	stat;
+
+	if (!superuser())
+		ereport(ERROR,
+				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
+				 errmsg("must be superuser to use pageinspect functions")));
+
+	relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
+	rel = relation_openrv(relrv, AccessShareLock);
+
+	bt_index_block_validate(rel, blkno);
 
 	buffer = ReadBuffer(rel, blkno);
 	LockBuffer(buffer, BUFFER_LOCK_SHARE);
@@ -284,17 +322,145 @@ bt_page_stats(PG_FUNCTION_ARGS)
 }
 
 
-/*
- * cross-call data structure for SRF
+/* -----------------------------------------------
+ * bt_multi_page_stats()
+ *
+ * Usage: SELECT * FROM bt_page_stats('t1_pkey', 1, 2);
+ * Arguments are index relation name, first block number, number of blocks
+ * -----------------------------------------------
  */
-struct user_args
+Datum
+bt_multi_page_stats(PG_FUNCTION_ARGS)
 {
-	Page		page;
-	OffsetNumber offset;
-	bool		leafpage;
-	bool		rightmost;
-	TupleDesc	tupd;
-};
+	Relation	rel;
+	ua_page_stats *uargs;
+	FuncCallContext *fctx;
+	MemoryContext mctx;
+
+	if (!superuser())
+		ereport(ERROR,
+				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
+				 errmsg("must be superuser to use pageinspect functions")));
+
+	if (SRF_IS_FIRSTCALL())
+	{
+		text	   *relname = PG_GETARG_TEXT_PP(0);
+		int64		blkno = PG_GETARG_INT64(1);
+		int64		blk_count = PG_GETARG_INT64(2);
+		RangeVar   *relrv;
+
+		fctx = SRF_FIRSTCALL_INIT();
+
+		relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
+		rel = relation_openrv(relrv, AccessShareLock);
+
+		/* Check that rel is a valid btree index and 1st block number is OK */
+		bt_index_block_validate(rel, blkno);
+
+		/*
+		 * Check if upperbound of the specified range is valid. If only one
+		 * page is requested, skip as we've already validated the page.
+		 */
+		if (blk_count > 1)
+			CHECK_RELATION_BLOCK_RANGE(rel, blkno + blk_count - 1);
+
+		/* Save arguments for reuse */
+		mctx = MemoryContextSwitchTo(fctx->multi_call_memory_ctx);
+
+		uargs = palloc(sizeof(ua_page_stats));
+
+		uargs->relid = RelationGetRelid(rel);
+		uargs->blkno = blkno;
+		uargs->allpages = (blk_count < 0);
+
+		if (uargs->allpages)
+			uargs->blk_count = RelationGetNumberOfBlocks(rel) - uargs->blkno;
+		else
+			uargs->blk_count = blk_count;
+
+		fctx->user_fctx = uargs;
+
+		MemoryContextSwitchTo(mctx);
+
+		/*
+		 * To avoid possibly leaking a relcache reference if the SRF isn't run
+		 * to completion, we close and re-open the index rel each time
+		 * through, using the index's OID for re-opens to ensure we get the
+		 * same rel.  Keep the AccessShareLock though, to ensure it doesn't go
+		 * away underneath us.
+		 */
+		relation_close(rel, NoLock);
+	}
+
+	fctx = SRF_PERCALL_SETUP();
+	uargs = fctx->user_fctx;
+
+
+	/* We should have lock already */
+	rel = relation_open(uargs->relid, NoLock);
+
+	if (uargs->allpages)
+		uargs->blk_count = RelationGetNumberOfBlocks(rel) - uargs->blkno;
+
+	/* We need to fetch next block statistics */
+	if (uargs->blk_count > 0)
+	{
+		Buffer		buffer;
+		Datum		result;
+		HeapTuple	tuple;
+		int			j;
+		char	   *values[11];
+		BTPageStat	stat;
+		TupleDesc	tupleDesc;
+
+		buffer = ReadBuffer(rel, uargs->blkno);
+		LockBuffer(buffer, BUFFER_LOCK_SHARE);
+
+		/* keep compiler quiet */
+		stat.btpo_prev = stat.btpo_next = InvalidBlockNumber;
+		stat.btpo_flags = stat.free_size = stat.avg_item_size = 0;
+
+		GetBTPageStatistics(uargs->blkno, buffer, &stat);
+
+		UnlockReleaseBuffer(buffer);
+		relation_close(rel, NoLock);
+
+		/* Build a tuple descriptor for our result type */
+		if (get_call_result_type(fcinfo, NULL, &tupleDesc) != TYPEFUNC_COMPOSITE)
+			elog(ERROR, "return type must be a row type");
+
+		j = 0;
+		values[j++] = psprintf("%u", stat.blkno);
+		values[j++] = psprintf("%c", stat.type);
+		values[j++] = psprintf("%u", stat.live_items);
+		values[j++] = psprintf("%u", stat.dead_items);
+		values[j++] = psprintf("%u", stat.avg_item_size);
+		values[j++] = psprintf("%u", stat.page_size);
+		values[j++] = psprintf("%u", stat.free_size);
+		values[j++] = psprintf("%u", stat.btpo_prev);
+		values[j++] = psprintf("%u", stat.btpo_next);
+		values[j++] = psprintf("%u", stat.btpo_level);
+		values[j++] = psprintf("%d", stat.btpo_flags);
+
+		/* Construct tuple to be returned */
+		tuple = BuildTupleFromCStrings(TupleDescGetAttInMetadata(tupleDesc),
+									   values);
+
+		result = HeapTupleGetDatum(tuple);
+
+		/*
+		 * Move to the next block number and decrement the number of blocks
+		 * still to be fetched
+		 */
+		uargs->blkno++;
+		uargs->blk_count--;
+
+		SRF_RETURN_NEXT(fctx, result);
+	}
+
+	relation_close(rel, NoLock);
+	SRF_RETURN_DONE(fctx);
+}
 
 /*-------------------------------------------------------
  * bt_page_print_tuples()
@@ -303,7 +469,7 @@ struct user_args
  * ------------------------------------------------------
  */
 static Datum
-bt_page_print_tuples(struct user_args *uargs)
+bt_page_print_tuples(ua_page_items *uargs)
 {
 	Page		page = uargs->page;
 	OffsetNumber offset = uargs->offset;
@@ -453,7 +619,7 @@ bt_page_items_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
 	Datum		result;
 	FuncCallContext *fctx;
 	MemoryContext mctx;
-	struct user_args *uargs;
+	ua_page_items *uargs;
 
 	if (!superuser())
 		ereport(ERROR,
@@ -473,33 +639,7 @@ bt_page_items_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
 		relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
 		rel = relation_openrv(relrv, AccessShareLock);
 
-		if (!IS_INDEX(rel) || !IS_BTREE(rel))
-			ereport(ERROR,
-					(errcode(ERRCODE_WRONG_OBJECT_TYPE),
-					 errmsg("\"%s\" is not a %s index",
-							RelationGetRelationName(rel), "btree")));
-
-		/*
-		 * Reject attempts to read non-local temporary relations; we would be
-		 * likely to get wrong data since we have no visibility into the
-		 * owning session's local buffers.
-		 */
-		if (RELATION_IS_OTHER_TEMP(rel))
-			ereport(ERROR,
-					(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
-					 errmsg("cannot access temporary tables of other sessions")));
-
-		if (blkno < 0 || blkno > MaxBlockNumber)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("invalid block number")));
-
-		if (blkno == 0)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("block 0 is a meta page")));
-
-		CHECK_RELATION_BLOCK_RANGE(rel, blkno);
+		bt_index_block_validate(rel, blkno);
 
 		buffer = ReadBuffer(rel, blkno);
 		LockBuffer(buffer, BUFFER_LOCK_SHARE);
@@ -511,7 +651,7 @@ bt_page_items_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
 		 */
 		mctx = MemoryContextSwitchTo(fctx->multi_call_memory_ctx);
 
-		uargs = palloc(sizeof(struct user_args));
+		uargs = palloc(sizeof(ua_page_items));
 
 		uargs->page = palloc(BLCKSZ);
 		memcpy(uargs->page, BufferGetPage(buffer), BLCKSZ);
@@ -587,7 +727,7 @@ bt_page_items_bytea(PG_FUNCTION_ARGS)
 	bytea	   *raw_page = PG_GETARG_BYTEA_P(0);
 	Datum		result;
 	FuncCallContext *fctx;
-	struct user_args *uargs;
+	ua_page_items *uargs;
 
 	if (!superuser())
 		ereport(ERROR,
@@ -603,7 +743,7 @@ bt_page_items_bytea(PG_FUNCTION_ARGS)
 		fctx = SRF_FIRSTCALL_INIT();
 		mctx = MemoryContextSwitchTo(fctx->multi_call_memory_ctx);
 
-		uargs = palloc(sizeof(struct user_args));
+		uargs = palloc(sizeof(ua_page_items));
 
 		uargs->page = get_page_from_raw(raw_page);
 
diff --git a/contrib/pageinspect/expected/btree.out b/contrib/pageinspect/expected/btree.out
index 035a81a759..97f2f4e2fa 100644
--- a/contrib/pageinspect/expected/btree.out
+++ b/contrib/pageinspect/expected/btree.out
@@ -33,7 +33,120 @@ btpo_level    | 0
 btpo_flags    | 3
 
 SELECT * FROM bt_page_stats('test1_a_idx', 2);
-ERROR:  block number out of range
+ERROR:  block number 2 is out of range
+-- bt_multi_page_stats() function returns a set of records of page statistics.
+CREATE TABLE test2 AS (SELECT generate_series(1, 1000)::int8 AS col1);
+CREATE INDEX test2_col1_idx ON test2(col1);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 0, 1);
+ERROR:  block 0 is a meta page
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, -1);
+-[ RECORD 1 ]-+-----
+blkno         | 1
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 0
+btpo_next     | 2
+btpo_level    | 0
+btpo_flags    | 1
+-[ RECORD 2 ]-+-----
+blkno         | 2
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 1
+btpo_next     | 4
+btpo_level    | 0
+btpo_flags    | 1
+-[ RECORD 3 ]-+-----
+blkno         | 3
+type          | r
+live_items    | 3
+dead_items    | 0
+avg_item_size | 13
+page_size     | 8192
+free_size     | 8096
+btpo_prev     | 0
+btpo_next     | 0
+btpo_level    | 1
+btpo_flags    | 2
+-[ RECORD 4 ]-+-----
+blkno         | 4
+type          | l
+live_items    | 268
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 2788
+btpo_prev     | 2
+btpo_next     | 0
+btpo_level    | 0
+btpo_flags    | 1
+
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, 0);
+(0 rows)
+
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, 2);
+-[ RECORD 1 ]-+-----
+blkno         | 1
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 0
+btpo_next     | 2
+btpo_level    | 0
+btpo_flags    | 1
+-[ RECORD 2 ]-+-----
+blkno         | 2
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 1
+btpo_next     | 4
+btpo_level    | 0
+btpo_flags    | 1
+
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 3, 2);
+-[ RECORD 1 ]-+-----
+blkno         | 3
+type          | r
+live_items    | 3
+dead_items    | 0
+avg_item_size | 13
+page_size     | 8192
+free_size     | 8096
+btpo_prev     | 0
+btpo_next     | 0
+btpo_level    | 1
+btpo_flags    | 2
+-[ RECORD 2 ]-+-----
+blkno         | 4
+type          | l
+live_items    | 268
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 2788
+btpo_prev     | 2
+btpo_next     | 0
+btpo_level    | 0
+btpo_flags    | 1
+
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 7, 2);
+ERROR:  block number 7 is out of range
+DROP TABLE test2;
 SELECT * FROM bt_page_items('test1_a_idx', -1);
 ERROR:  invalid block number
 SELECT * FROM bt_page_items('test1_a_idx', 0);
@@ -51,7 +164,7 @@ htid       | (0,1)
 tids       | 
 
 SELECT * FROM bt_page_items('test1_a_idx', 2);
-ERROR:  block number out of range
+ERROR:  block number 2 is out of range
 SELECT * FROM bt_page_items(get_raw_page('test1_a_idx', -1));
 ERROR:  invalid block number
 SELECT * FROM bt_page_items(get_raw_page('test1_a_idx', 0));
diff --git a/contrib/pageinspect/pageinspect--1.11--1.12.sql b/contrib/pageinspect/pageinspect--1.11--1.12.sql
new file mode 100644
index 0000000000..f1166c5234
--- /dev/null
+++ b/contrib/pageinspect/pageinspect--1.11--1.12.sql
@@ -0,0 +1,23 @@
+/* contrib/pageinspect/pageinspect--1.11--1.12.sql */
+
+-- complain if script is sourced in psql, rather than via ALTER EXTENSION
+\echo Use "ALTER EXTENSION pageinspect UPDATE TO '1.12'" to load this file. \quit
+
+--
+-- bt_multi_page_stats()
+--
+CREATE FUNCTION bt_multi_page_stats(IN relname text, IN blkno int8, IN blk_count int8,
+    OUT blkno int8,
+    OUT type "char",
+    OUT live_items int4,
+    OUT dead_items int4,
+    OUT avg_item_size int4,
+    OUT page_size int4,
+    OUT free_size int4,
+    OUT btpo_prev int8,
+    OUT btpo_next int8,
+    OUT btpo_level int8,
+    OUT btpo_flags int4)
+RETURNS SETOF record
+AS 'MODULE_PATHNAME', 'bt_multi_page_stats'
+LANGUAGE C STRICT PARALLEL SAFE;
diff --git a/contrib/pageinspect/pageinspect.control b/contrib/pageinspect/pageinspect.control
index f277413dd8..b2804e9b12 100644
--- a/contrib/pageinspect/pageinspect.control
+++ b/contrib/pageinspect/pageinspect.control
@@ -1,5 +1,5 @@
 # pageinspect extension
 comment = 'inspect the contents of database pages at a low level'
-default_version = '1.11'
+default_version = '1.12'
 module_pathname = '$libdir/pageinspect'
 relocatable = true
diff --git a/contrib/pageinspect/sql/btree.sql b/contrib/pageinspect/sql/btree.sql
index 1f554f0f67..102ebdefe3 100644
--- a/contrib/pageinspect/sql/btree.sql
+++ b/contrib/pageinspect/sql/btree.sql
@@ -11,6 +11,17 @@ SELECT * FROM bt_page_stats('test1_a_idx', 0);
 SELECT * FROM bt_page_stats('test1_a_idx', 1);
 SELECT * FROM bt_page_stats('test1_a_idx', 2);
 
+-- bt_multi_page_stats() function returns a set of records of page statistics.
+CREATE TABLE test2 AS (SELECT generate_series(1, 1000)::int8 AS col1);
+CREATE INDEX test2_col1_idx ON test2(col1);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 0, 1);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, -1);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, 0);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, 2);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 3, 2);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 7, 2);
+DROP TABLE test2;
+
 SELECT * FROM bt_page_items('test1_a_idx', -1);
 SELECT * FROM bt_page_items('test1_a_idx', 0);
 SELECT * FROM bt_page_items('test1_a_idx', 1);
diff --git a/doc/src/sgml/pageinspect.sgml b/doc/src/sgml/pageinspect.sgml
index d4ee34ee0f..8ad10b60c7 100644
--- a/doc/src/sgml/pageinspect.sgml
+++ b/doc/src/sgml/pageinspect.sgml
@@ -346,6 +346,53 @@ btpo_flags    | 3
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term>
+     <function>bt_multi_page_stats(relname text, blkno bigint, blk_count bigint) returns setof record</function>
+     <indexterm>
+      <primary>bt_multi_page_stats</primary>
+     </indexterm>
+    </term>
+
+    <listitem>
+     <para>
+      <function>bt_multi_page_stats</function> returns summary information
+      about the <structfield>blk_count</structfield> number of B-tree index
+      pages starting from <structfield>blkno</structfield> page.  A value of
+      <literal>-1</literal> for <structfield>blk_count</structfield> returns
+      summary information for all index pages starting from
+      <structfield>blkno</structfield> page.  For example:
+<screen>
+test=# SELECT * FROM bt_multi_page_stats('pg_proc_oid_index', 5, 2);
+-[ RECORD 1 ]-+-----
+blkno         | 5
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 4
+btpo_next     | 6
+btpo_level    | 0
+btpo_flags    | 1
+-[ RECORD 2 ]-+-----
+blkno         | 6
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 5
+btpo_next     | 7
+btpo_level    | 0
+btpo_flags    | 1
+</screen>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term>
      <function>bt_page_items(relname text, blkno bigint) returns setof record</function>

diff --git a/contrib/pageinspect/Makefile b/contrib/pageinspect/Makefile
index ad5a3ac511..95e030b396 100644
--- a/contrib/pageinspect/Makefile
+++ b/contrib/pageinspect/Makefile
@@ -13,7 +13,7 @@ OBJS = \
 	rawpage.o
 
 EXTENSION = pageinspect
-DATA =  pageinspect--1.10--1.11.sql \
+DATA =  pageinspect--1.11--1.12.sql pageinspect--1.10--1.11.sql \
 	pageinspect--1.9--1.10.sql pageinspect--1.8--1.9.sql \
 	pageinspect--1.7--1.8.sql pageinspect--1.6--1.7.sql \
 	pageinspect--1.5.sql pageinspect--1.5--1.6.sql \
diff --git a/contrib/pageinspect/btreefuncs.c b/contrib/pageinspect/btreefuncs.c
index 9375d55e14..e2cbed7377 100644
--- a/contrib/pageinspect/btreefuncs.c
+++ b/contrib/pageinspect/btreefuncs.c
@@ -46,6 +46,7 @@ PG_FUNCTION_INFO_V1(bt_page_items);
 PG_FUNCTION_INFO_V1(bt_page_items_bytea);
 PG_FUNCTION_INFO_V1(bt_page_stats_1_9);
 PG_FUNCTION_INFO_V1(bt_page_stats);
+PG_FUNCTION_INFO_V1(bt_multi_page_stats);
 
 #define IS_INDEX(r) ((r)->rd_rel->relkind == RELKIND_INDEX)
 #define IS_BTREE(r) ((r)->rd_rel->relam == BTREE_AM_OID)
@@ -55,7 +56,7 @@ PG_FUNCTION_INFO_V1(bt_page_stats);
 /* note: BlockNumber is unsigned, hence can't be negative */
 #define CHECK_RELATION_BLOCK_RANGE(rel, blkno) { \
 		if ( RelationGetNumberOfBlocks(rel) <= (BlockNumber) (blkno) ) \
-			 elog(ERROR, "block number out of range"); }
+			 elog(ERROR, "block number " INT64_FORMAT " is out of range", blkno); }
 
 /* ------------------------------------------------
  * structure for single btree page statistics
@@ -80,6 +81,29 @@ typedef struct BTPageStat
 	BTCycleId	btpo_cycleid;
 } BTPageStat;
 
+/*
+ * cross-call data structure for SRF for page stats
+ */
+typedef struct ua_page_stats
+{
+	Oid			relid;
+	int64		blkno;
+	int64		blk_count;
+	bool		allpages;
+} ua_page_stats;
+
+/*
+ * cross-call data structure for SRF for page items
+ */
+typedef struct ua_page_items
+{
+	Page		page;
+	OffsetNumber offset;
+	bool		leafpage;
+	bool		rightmost;
+	TupleDesc	tupd;
+} ua_page_items;
+
 
 /* -------------------------------------------------
  * GetBTPageStatistics()
@@ -177,34 +201,15 @@ GetBTPageStatistics(BlockNumber blkno, Buffer buffer, BTPageStat *stat)
 }
 
 /* -----------------------------------------------
- * bt_page_stats()
+ * bt_index_block_validate()
  *
- * Usage: SELECT * FROM bt_page_stats('t1_pkey', 1);
+ * Validate index type is btree and block number
+ * is within a valid block number range.
  * -----------------------------------------------
  */
-static Datum
-bt_page_stats_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
+static void
+bt_index_block_validate(Relation rel, int64 blkno)
 {
-	text	   *relname = PG_GETARG_TEXT_PP(0);
-	int64		blkno = (ext_version == PAGEINSPECT_V1_8 ? PG_GETARG_UINT32(1) : PG_GETARG_INT64(1));
-	Buffer		buffer;
-	Relation	rel;
-	RangeVar   *relrv;
-	Datum		result;
-	HeapTuple	tuple;
-	TupleDesc	tupleDesc;
-	int			j;
-	char	   *values[11];
-	BTPageStat	stat;
-
-	if (!superuser())
-		ereport(ERROR,
-				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
-				 errmsg("must be superuser to use pageinspect functions")));
-
-	relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
-	rel = relation_openrv(relrv, AccessShareLock);
-
 	if (!IS_INDEX(rel) || !IS_BTREE(rel))
 		ereport(ERROR,
 				(errcode(ERRCODE_WRONG_OBJECT_TYPE),
@@ -232,6 +237,39 @@ bt_page_stats_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
 				 errmsg("block 0 is a meta page")));
 
 	CHECK_RELATION_BLOCK_RANGE(rel, blkno);
+}
+
+/* -----------------------------------------------
+ * bt_page_stats()
+ *
+ * Usage: SELECT * FROM bt_page_stats('t1_pkey', 1);
+ * Arguments are index relation name and block number
+ * -----------------------------------------------
+ */
+static Datum
+bt_page_stats_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
+{
+	text	   *relname = PG_GETARG_TEXT_PP(0);
+	int64		blkno = (ext_version == PAGEINSPECT_V1_8 ? PG_GETARG_UINT32(1) : PG_GETARG_INT64(1));
+	Buffer		buffer;
+	Relation	rel;
+	RangeVar   *relrv;
+	Datum		result;
+	HeapTuple	tuple;
+	TupleDesc	tupleDesc;
+	int			j;
+	char	   *values[11];
+	BTPageStat	stat;
+
+	if (!superuser())
+		ereport(ERROR,
+				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
+				 errmsg("must be superuser to use pageinspect functions")));
+
+	relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
+	rel = relation_openrv(relrv, AccessShareLock);
+
+	bt_index_block_validate(rel, blkno);
 
 	buffer = ReadBuffer(rel, blkno);
 	LockBuffer(buffer, BUFFER_LOCK_SHARE);
@@ -284,17 +322,145 @@ bt_page_stats(PG_FUNCTION_ARGS)
 }
 
 
-/*
- * cross-call data structure for SRF
+/* -----------------------------------------------
+ * bt_multi_page_stats()
+ *
+ * Usage: SELECT * FROM bt_page_stats('t1_pkey', 1, 2);
+ * Arguments are index relation name, first block number, number of blocks
+ * -----------------------------------------------
  */
-struct user_args
+Datum
+bt_multi_page_stats(PG_FUNCTION_ARGS)
 {
-	Page		page;
-	OffsetNumber offset;
-	bool		leafpage;
-	bool		rightmost;
-	TupleDesc	tupd;
-};
+	Relation	rel;
+	ua_page_stats *uargs;
+	FuncCallContext *fctx;
+	MemoryContext mctx;
+
+	if (!superuser())
+		ereport(ERROR,
+				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
+				 errmsg("must be superuser to use pageinspect functions")));
+
+	if (SRF_IS_FIRSTCALL())
+	{
+		text	   *relname = PG_GETARG_TEXT_PP(0);
+		int64		blkno = PG_GETARG_INT64(1);
+		int64		blk_count = PG_GETARG_INT64(2);
+		RangeVar   *relrv;
+
+		fctx = SRF_FIRSTCALL_INIT();
+
+		relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
+		rel = relation_openrv(relrv, AccessShareLock);
+
+		/* Check that rel is a valid btree index and 1st block number is OK */
+		bt_index_block_validate(rel, blkno);
+
+		/*
+		 * Check if upperbound of the specified range is valid. If only one
+		 * page is requested, skip as we've already validated the page.
+		 */
+		if (blk_count > 1)
+			CHECK_RELATION_BLOCK_RANGE(rel, blkno + blk_count - 1);
+
+		/* Save arguments for reuse */
+		mctx = MemoryContextSwitchTo(fctx->multi_call_memory_ctx);
+
+		uargs = palloc(sizeof(ua_page_stats));
+
+		uargs->relid = RelationGetRelid(rel);
+		uargs->blkno = blkno;
+		uargs->allpages = (blk_count < 0);
+
+		if (uargs->allpages)
+			uargs->blk_count = RelationGetNumberOfBlocks(rel) - uargs->blkno;
+		else
+			uargs->blk_count = blk_count;
+
+		fctx->user_fctx = uargs;
+
+		MemoryContextSwitchTo(mctx);
+
+		/*
+		 * To avoid possibly leaking a relcache reference if the SRF isn't run
+		 * to completion, we close and re-open the index rel each time
+		 * through, using the index's OID for re-opens to ensure we get the
+		 * same rel.  Keep the AccessShareLock though, to ensure it doesn't go
+		 * away underneath us.
+		 */
+		relation_close(rel, NoLock);
+	}
+
+	fctx = SRF_PERCALL_SETUP();
+	uargs = fctx->user_fctx;
+
+
+	/* We should have lock already */
+	rel = relation_open(uargs->relid, NoLock);
+
+	if (uargs->allpages)
+		uargs->blk_count = RelationGetNumberOfBlocks(rel) - uargs->blkno;
+
+	/* We need to fetch next block statistics */
+	if (uargs->blk_count > 0)
+	{
+		Buffer		buffer;
+		Datum		result;
+		HeapTuple	tuple;
+		int			j;
+		char	   *values[11];
+		BTPageStat	stat;
+		TupleDesc	tupleDesc;
+
+		buffer = ReadBuffer(rel, uargs->blkno);
+		LockBuffer(buffer, BUFFER_LOCK_SHARE);
+
+		/* keep compiler quiet */
+		stat.btpo_prev = stat.btpo_next = InvalidBlockNumber;
+		stat.btpo_flags = stat.free_size = stat.avg_item_size = 0;
+
+		GetBTPageStatistics(uargs->blkno, buffer, &stat);
+
+		UnlockReleaseBuffer(buffer);
+		relation_close(rel, NoLock);
+
+		/* Build a tuple descriptor for our result type */
+		if (get_call_result_type(fcinfo, NULL, &tupleDesc) != TYPEFUNC_COMPOSITE)
+			elog(ERROR, "return type must be a row type");
+
+		j = 0;
+		values[j++] = psprintf("%u", stat.blkno);
+		values[j++] = psprintf("%c", stat.type);
+		values[j++] = psprintf("%u", stat.live_items);
+		values[j++] = psprintf("%u", stat.dead_items);
+		values[j++] = psprintf("%u", stat.avg_item_size);
+		values[j++] = psprintf("%u", stat.page_size);
+		values[j++] = psprintf("%u", stat.free_size);
+		values[j++] = psprintf("%u", stat.btpo_prev);
+		values[j++] = psprintf("%u", stat.btpo_next);
+		values[j++] = psprintf("%u", stat.btpo_level);
+		values[j++] = psprintf("%d", stat.btpo_flags);
+
+		/* Construct tuple to be returned */
+		tuple = BuildTupleFromCStrings(TupleDescGetAttInMetadata(tupleDesc),
+									   values);
+
+		result = HeapTupleGetDatum(tuple);
+
+		/*
+		 * Move to the next block number and decrement the number of blocks
+		 * still to be fetched
+		 */
+		uargs->blkno++;
+		uargs->blk_count--;
+
+		SRF_RETURN_NEXT(fctx, result);
+	}
+
+	relation_close(rel, NoLock);
+	SRF_RETURN_DONE(fctx);
+}
 
 /*-------------------------------------------------------
  * bt_page_print_tuples()
@@ -303,7 +469,7 @@ struct user_args
  * ------------------------------------------------------
  */
 static Datum
-bt_page_print_tuples(struct user_args *uargs)
+bt_page_print_tuples(ua_page_items *uargs)
 {
 	Page		page = uargs->page;
 	OffsetNumber offset = uargs->offset;
@@ -453,7 +619,7 @@ bt_page_items_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
 	Datum		result;
 	FuncCallContext *fctx;
 	MemoryContext mctx;
-	struct user_args *uargs;
+	ua_page_items *uargs;
 
 	if (!superuser())
 		ereport(ERROR,
@@ -473,33 +639,7 @@ bt_page_items_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
 		relrv = makeRangeVarFromNameList(textToQualifiedNameList(relname));
 		rel = relation_openrv(relrv, AccessShareLock);
 
-		if (!IS_INDEX(rel) || !IS_BTREE(rel))
-			ereport(ERROR,
-					(errcode(ERRCODE_WRONG_OBJECT_TYPE),
-					 errmsg("\"%s\" is not a %s index",
-							RelationGetRelationName(rel), "btree")));
-
-		/*
-		 * Reject attempts to read non-local temporary relations; we would be
-		 * likely to get wrong data since we have no visibility into the
-		 * owning session's local buffers.
-		 */
-		if (RELATION_IS_OTHER_TEMP(rel))
-			ereport(ERROR,
-					(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
-					 errmsg("cannot access temporary tables of other sessions")));
-
-		if (blkno < 0 || blkno > MaxBlockNumber)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("invalid block number")));
-
-		if (blkno == 0)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("block 0 is a meta page")));
-
-		CHECK_RELATION_BLOCK_RANGE(rel, blkno);
+		bt_index_block_validate(rel, blkno);
 
 		buffer = ReadBuffer(rel, blkno);
 		LockBuffer(buffer, BUFFER_LOCK_SHARE);
@@ -511,7 +651,7 @@ bt_page_items_internal(PG_FUNCTION_ARGS, enum pageinspect_version ext_version)
 		 */
 		mctx = MemoryContextSwitchTo(fctx->multi_call_memory_ctx);
 
-		uargs = palloc(sizeof(struct user_args));
+		uargs = palloc(sizeof(ua_page_items));
 
 		uargs->page = palloc(BLCKSZ);
 		memcpy(uargs->page, BufferGetPage(buffer), BLCKSZ);
@@ -587,7 +727,7 @@ bt_page_items_bytea(PG_FUNCTION_ARGS)
 	bytea	   *raw_page = PG_GETARG_BYTEA_P(0);
 	Datum		result;
 	FuncCallContext *fctx;
-	struct user_args *uargs;
+	ua_page_items *uargs;
 
 	if (!superuser())
 		ereport(ERROR,
@@ -603,7 +743,7 @@ bt_page_items_bytea(PG_FUNCTION_ARGS)
 		fctx = SRF_FIRSTCALL_INIT();
 		mctx = MemoryContextSwitchTo(fctx->multi_call_memory_ctx);
 
-		uargs = palloc(sizeof(struct user_args));
+		uargs = palloc(sizeof(ua_page_items));
 
 		uargs->page = get_page_from_raw(raw_page);
 
diff --git a/contrib/pageinspect/expected/btree.out b/contrib/pageinspect/expected/btree.out
index 035a81a759..97f2f4e2fa 100644
--- a/contrib/pageinspect/expected/btree.out
+++ b/contrib/pageinspect/expected/btree.out
@@ -33,7 +33,120 @@ btpo_level    | 0
 btpo_flags    | 3
 
 SELECT * FROM bt_page_stats('test1_a_idx', 2);
-ERROR:  block number out of range
+ERROR:  block number 2 is out of range
+-- bt_multi_page_stats() function returns a set of records of page statistics.
+CREATE TABLE test2 AS (SELECT generate_series(1, 1000)::int8 AS col1);
+CREATE INDEX test2_col1_idx ON test2(col1);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 0, 1);
+ERROR:  block 0 is a meta page
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, -1);
+-[ RECORD 1 ]-+-----
+blkno         | 1
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 0
+btpo_next     | 2
+btpo_level    | 0
+btpo_flags    | 1
+-[ RECORD 2 ]-+-----
+blkno         | 2
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 1
+btpo_next     | 4
+btpo_level    | 0
+btpo_flags    | 1
+-[ RECORD 3 ]-+-----
+blkno         | 3
+type          | r
+live_items    | 3
+dead_items    | 0
+avg_item_size | 13
+page_size     | 8192
+free_size     | 8096
+btpo_prev     | 0
+btpo_next     | 0
+btpo_level    | 1
+btpo_flags    | 2
+-[ RECORD 4 ]-+-----
+blkno         | 4
+type          | l
+live_items    | 268
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 2788
+btpo_prev     | 2
+btpo_next     | 0
+btpo_level    | 0
+btpo_flags    | 1
+
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, 0);
+(0 rows)
+
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, 2);
+-[ RECORD 1 ]-+-----
+blkno         | 1
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 0
+btpo_next     | 2
+btpo_level    | 0
+btpo_flags    | 1
+-[ RECORD 2 ]-+-----
+blkno         | 2
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 1
+btpo_next     | 4
+btpo_level    | 0
+btpo_flags    | 1
+
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 3, 2);
+-[ RECORD 1 ]-+-----
+blkno         | 3
+type          | r
+live_items    | 3
+dead_items    | 0
+avg_item_size | 13
+page_size     | 8192
+free_size     | 8096
+btpo_prev     | 0
+btpo_next     | 0
+btpo_level    | 1
+btpo_flags    | 2
+-[ RECORD 2 ]-+-----
+blkno         | 4
+type          | l
+live_items    | 268
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 2788
+btpo_prev     | 2
+btpo_next     | 0
+btpo_level    | 0
+btpo_flags    | 1
+
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 7, 2);
+ERROR:  block number 7 is out of range
+DROP TABLE test2;
 SELECT * FROM bt_page_items('test1_a_idx', -1);
 ERROR:  invalid block number
 SELECT * FROM bt_page_items('test1_a_idx', 0);
@@ -51,7 +164,7 @@ htid       | (0,1)
 tids       | 
 
 SELECT * FROM bt_page_items('test1_a_idx', 2);
-ERROR:  block number out of range
+ERROR:  block number 2 is out of range
 SELECT * FROM bt_page_items(get_raw_page('test1_a_idx', -1));
 ERROR:  invalid block number
 SELECT * FROM bt_page_items(get_raw_page('test1_a_idx', 0));
diff --git a/contrib/pageinspect/meson.build b/contrib/pageinspect/meson.build
index 25fa7dc20c..3318260e86 100644
--- a/contrib/pageinspect/meson.build
+++ b/contrib/pageinspect/meson.build
@@ -34,6 +34,7 @@ install_data(
   'pageinspect--1.8--1.9.sql',
   'pageinspect--1.9--1.10.sql',
   'pageinspect--1.10--1.11.sql',
+  'pageinspect--1.11--1.12.sql',
   'pageinspect.control',
   kwargs: contrib_data_args,
 )
diff --git a/contrib/pageinspect/pageinspect--1.11--1.12.sql b/contrib/pageinspect/pageinspect--1.11--1.12.sql
new file mode 100644
index 0000000000..f1166c5234
--- /dev/null
+++ b/contrib/pageinspect/pageinspect--1.11--1.12.sql
@@ -0,0 +1,23 @@
+/* contrib/pageinspect/pageinspect--1.11--1.12.sql */
+
+-- complain if script is sourced in psql, rather than via ALTER EXTENSION
+\echo Use "ALTER EXTENSION pageinspect UPDATE TO '1.12'" to load this file. \quit
+
+--
+-- bt_multi_page_stats()
+--
+CREATE FUNCTION bt_multi_page_stats(IN relname text, IN blkno int8, IN blk_count int8,
+    OUT blkno int8,
+    OUT type "char",
+    OUT live_items int4,
+    OUT dead_items int4,
+    OUT avg_item_size int4,
+    OUT page_size int4,
+    OUT free_size int4,
+    OUT btpo_prev int8,
+    OUT btpo_next int8,
+    OUT btpo_level int8,
+    OUT btpo_flags int4)
+RETURNS SETOF record
+AS 'MODULE_PATHNAME', 'bt_multi_page_stats'
+LANGUAGE C STRICT PARALLEL SAFE;
diff --git a/contrib/pageinspect/pageinspect.control b/contrib/pageinspect/pageinspect.control
index f277413dd8..b2804e9b12 100644
--- a/contrib/pageinspect/pageinspect.control
+++ b/contrib/pageinspect/pageinspect.control
@@ -1,5 +1,5 @@
 # pageinspect extension
 comment = 'inspect the contents of database pages at a low level'
-default_version = '1.11'
+default_version = '1.12'
 module_pathname = '$libdir/pageinspect'
 relocatable = true
diff --git a/contrib/pageinspect/sql/btree.sql b/contrib/pageinspect/sql/btree.sql
index 1f554f0f67..102ebdefe3 100644
--- a/contrib/pageinspect/sql/btree.sql
+++ b/contrib/pageinspect/sql/btree.sql
@@ -11,6 +11,17 @@ SELECT * FROM bt_page_stats('test1_a_idx', 0);
 SELECT * FROM bt_page_stats('test1_a_idx', 1);
 SELECT * FROM bt_page_stats('test1_a_idx', 2);
 
+-- bt_multi_page_stats() function returns a set of records of page statistics.
+CREATE TABLE test2 AS (SELECT generate_series(1, 1000)::int8 AS col1);
+CREATE INDEX test2_col1_idx ON test2(col1);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 0, 1);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, -1);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, 0);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 1, 2);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 3, 2);
+SELECT * FROM bt_multi_page_stats('test2_col1_idx', 7, 2);
+DROP TABLE test2;
+
 SELECT * FROM bt_page_items('test1_a_idx', -1);
 SELECT * FROM bt_page_items('test1_a_idx', 0);
 SELECT * FROM bt_page_items('test1_a_idx', 1);
diff --git a/doc/src/sgml/pageinspect.sgml b/doc/src/sgml/pageinspect.sgml
index d4ee34ee0f..8ad10b60c7 100644
--- a/doc/src/sgml/pageinspect.sgml
+++ b/doc/src/sgml/pageinspect.sgml
@@ -346,6 +346,53 @@ btpo_flags    | 3
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term>
+     <function>bt_multi_page_stats(relname text, blkno bigint, blk_count bigint) returns setof record</function>
+     <indexterm>
+      <primary>bt_multi_page_stats</primary>
+     </indexterm>
+    </term>
+
+    <listitem>
+     <para>
+      <function>bt_multi_page_stats</function> returns summary information
+      about the <structfield>blk_count</structfield> number of B-tree index
+      pages starting from <structfield>blkno</structfield> page.  A value of
+      <literal>-1</literal> for <structfield>blk_count</structfield> returns
+      summary information for all index pages starting from
+      <structfield>blkno</structfield> page.  For example:
+<screen>
+test=# SELECT * FROM bt_multi_page_stats('pg_proc_oid_index', 5, 2);
+-[ RECORD 1 ]-+-----
+blkno         | 5
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 4
+btpo_next     | 6
+btpo_level    | 0
+btpo_flags    | 1
+-[ RECORD 2 ]-+-----
+blkno         | 6
+type          | l
+live_items    | 367
+dead_items    | 0
+avg_item_size | 16
+page_size     | 8192
+free_size     | 808
+btpo_prev     | 5
+btpo_next     | 7
+btpo_level    | 0
+btpo_flags    | 1
+</screen>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term>
      <function>bt_page_items(relname text, blkno bigint) returns setof record</function>