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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 19:27:10 +00:00
parent b328083249
commit cbca48aa24
6 changed files with 20 additions and 6 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 1.51 2004/12/31 21:59:45 pgsql Exp $
* $PostgreSQL: pgsql/src/backend/executor/nodeSeqscan.c,v 1.51.4.1 2006/12/26 19:27:10 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -319,6 +319,8 @@ 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)