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Reset the per-output-tuple exprcontext each time through the main loop in

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ExecModifyTable().  This avoids memory leakage when trigger functions leave
junk behind in that context (as they more or less must).  Problem and solution
identified by Dean Rasheed.

I'm a bit concerned about the longevity of this solution --- once a plan can
have multiple ModifyTable nodes, we are very possibly going to have to do
something different.  But it should hold up for 9.0.
This commit is contained in:
Tom Lane 2010-08-18 21:52:32 +00:00
parent 2eba69addc
commit 205fc921d7
1 changed files with 9 additions and 1 deletions
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10
src/backend/executor/nodeModifyTable.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/executor/nodeModifyTable.c,v 1.7 2010/02/26 02:00:42 momjian Exp $
* $PostgreSQL: pgsql/src/backend/executor/nodeModifyTable.c,v 1.7.4.1 2010/08/18 21:52:32 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -682,6 +682,14 @@ ExecModifyTable(ModifyTableState *node)
*/
for (;;)
{
/*
* Reset the per-output-tuple exprcontext. This is needed because
* triggers expect to use that context as workspace. It's a bit ugly
* to do this below the top level of the plan, however. We might need
* to rethink this later.
*/
ResetPerTupleExprContext(estate);
planSlot = ExecProcNode(subplanstate);
if (TupIsNull(planSlot))