From: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: Wed, 29 Jun 2011 18:40:27 +0000 (+0300)
Subject: Grab predicate locks on matching tuples in a lossy bitmap heap scan.
X-Git-Tag: REL9_2_BETA1~1477
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=d9fe63acb033141be695815a8a663de8dae4f8af;p=postgresql

Grab predicate locks on matching tuples in a lossy bitmap heap scan.
Non-lossy case was already handled correctly.

Kevin Grittner
---

diff --git a/src/backend/executor/nodeBitmapHeapscan.c b/src/backend/executor/nodeBitmapHeapscan.c
index 40ad775758..568035a481 100644
--- a/src/backend/executor/nodeBitmapHeapscan.c
+++ b/src/backend/executor/nodeBitmapHeapscan.c
@@ -42,6 +42,7 @@
 #include "executor/nodeBitmapHeapscan.h"
 #include "pgstat.h"
 #include "storage/bufmgr.h"
+#include "storage/predicate.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/tqual.h"
@@ -371,14 +372,23 @@ bitgetpage(HeapScanDesc scan, TBMIterateResult *tbmres)
 		{
 			ItemId		lp;
 			HeapTupleData loctup;
+			bool		valid;
 
 			lp = PageGetItemId(dp, offnum);
 			if (!ItemIdIsNormal(lp))
 				continue;
 			loctup.t_data = (HeapTupleHeader) PageGetItem((Page) dp, lp);
 			loctup.t_len = ItemIdGetLength(lp);
-			if (HeapTupleSatisfiesVisibility(&loctup, snapshot, buffer))
+			loctup.t_tableOid = scan->rs_rd->rd_id;
+			ItemPointerSet(&loctup.t_self, page, offnum);
+			valid = HeapTupleSatisfiesVisibility(&loctup, snapshot, buffer);
+			if (valid)
+			{
 				scan->rs_vistuples[ntup++] = offnum;
+				PredicateLockTuple(scan->rs_rd, &loctup, snapshot);
+			}
+			CheckForSerializableConflictOut(valid, scan->rs_rd, &loctup,
+											buffer, snapshot);
 		}
 	}