diff --git a/src/backend/commands/indexcmds.c b/src/backend/commands/indexcmds.c
index f8ee4b0..4b7520b 100644
--- a/src/backend/commands/indexcmds.c
+++ b/src/backend/commands/indexcmds.c
@@ -1001,6 +1001,19 @@ DefineIndex(Oid relationId,
 					ListCell   *lc;
 
 					/*
+					 * We can't use the same index name for the child index,
+					 * so clear idxname to let the recursive invocation choose
+					 * a new name.  Likewise, the existing target relation
+					 * field is wrong, and if indexOid or oldNode are set,
+					 * they mustn't be applied to the child either.
+					 */
+					childStmt->idxname = NULL;
+					childStmt->relation = NULL;
+					childStmt->relationId = childRelid;
+					childStmt->indexOid = InvalidOid;
+					childStmt->oldNode = InvalidOid;
+
+					/*
 					 * Adjust any Vars (both in expressions and in the index's
 					 * WHERE clause) to match the partition's column numbering
 					 * in case it's different from the parent's.
@@ -1031,8 +1044,6 @@ DefineIndex(Oid relationId,
 					if (found_whole_row)
 						elog(ERROR, "cannot convert whole-row table reference");
 
-					childStmt->idxname = NULL;
-					childStmt->relationId = childRelid;
 					DefineIndex(childRelid, childStmt,
 								InvalidOid, /* no predefined OID */
 								indexRelationId,	/* this is our child */
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 65ede33..865fc42 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -10696,7 +10696,9 @@ TryReuseIndex(Oid oldId, IndexStmt *stmt)
 	{
 		Relation	irel = index_open(oldId, NoLock);
 
-		stmt->oldNode = irel->rd_node.relNode;
+		/* If it's a partitioned index, there is no storage to share. */
+		if (irel->rd_rel->relkind != RELKIND_PARTITIONED_INDEX)
+			stmt->oldNode = irel->rd_node.relNode;
 		index_close(irel, NoLock);
 	}
 }