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Repair bug #2839: the various ExecReScan functions need to reset

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ps_TupFromTlist in plan nodes that make use of it.  This was being done
correctly in join nodes and Result nodes but not in any relation-scan nodes.
Bug would lead to bogus results if a set-returning function appeared in the
targetlist of a subquery that could be rescanned after partial execution,
for example a subquery within EXISTS().  Bug has been around forever :-(
... surprising it wasn't reported before.
This commit is contained in:
Tom Lane
2006-12-26 19:26:46 +00:00
parent fccf99f0c8
commit 68996463d4
8 changed files with 27 additions and 8 deletions
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4
src/backend/executor/nodeSeqscan.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/executor/nodeSeqscan.c,v 1.61 2006/10/04 00:29:52 momjian Exp $
* $PostgreSQL: pgsql/src/backend/executor/nodeSeqscan.c,v 1.62 2006/12/26 19:26:46 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -295,6 +295,8 @@ ExecSeqReScan(SeqScanState *node, ExprContext *exprCtxt)
estate = node->ps.state;
scanrelid = ((SeqScan *) node->ps.plan)->scanrelid;
node->ps.ps_TupFromTlist = false;
/* If this is re-scanning of PlanQual ... */
if (estate->es_evTuple != NULL &&
estate->es_evTuple[scanrelid - 1] != NULL)