From: Melanie Plageman <melanieplageman@gmail.com>
Date: Thu, 19 Dec 2024 16:55:18 +0000 (-0500)
Subject: Remove extra prefetch iterator setup for Bitmap Table Scan
X-Git-Tag: REL_18_BETA1~1237
X-Git-Url: http://git.postgresql.org/gitweb/?a=commitdiff_plain;h=2128cebcdb2f32303baf200fa2ccb2947366c636;p=postgresql.git

Remove extra prefetch iterator setup for Bitmap Table Scan

1a0da347a7ac98db replaced Bitmap Table Scan's separate private and
shared bitmap iterators with a unified iterator. It accidentally set up
the prefetch iterator twice for non-parallel bitmap table scans. Remove
the extra set up call to tbm_begin_iterate().
---

diff --git a/src/backend/executor/nodeBitmapHeapscan.c b/src/backend/executor/nodeBitmapHeapscan.c
index 928c94cab6a..e6067500e11 100644
--- a/src/backend/executor/nodeBitmapHeapscan.c
+++ b/src/backend/executor/nodeBitmapHeapscan.c
@@ -105,15 +105,6 @@ BitmapHeapNext(BitmapHeapScanState *node)
 				elog(ERROR, "unrecognized result from subplan");
 
 			node->tbm = tbm;
-
-#ifdef USE_PREFETCH
-			if (node->prefetch_maximum > 0)
-				node->prefetch_iterator =
-					tbm_begin_iterate(node->tbm, dsa,
-									  pstate ?
-									  pstate->prefetch_iterator :
-									  InvalidDsaPointer);
-#endif							/* USE_PREFETCH */
 		}
 		else if (BitmapShouldInitializeSharedState(pstate))
 		{