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Fix trigger WHEN conditions when both BEFORE and AFTER triggers exist.

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Due to tuple-slot mismanagement, evaluation of WHEN conditions for AFTER
ROW UPDATE triggers could crash if there had been a BEFORE ROW trigger
fired for the same update.  Fix by not trying to overload the use of
estate->es_trig_tuple_slot.  Per report from Yoran Heling.

Back-patch to 9.0, when trigger WHEN conditions were introduced.
This commit is contained in:
Tom Lane
2011-08-21 18:15:55 -04:00
parent 6cc08e703b
commit b33f78df17
6 changed files with 62 additions and 4 deletions
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3
src/include/nodes/execnodes.h
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@ -354,7 +354,8 @@ typedef struct EState
/* Stuff used for firing triggers: */
List *es_trig_target_relations; /* trigger-only ResultRelInfos */
TupleTableSlot *es_trig_tuple_slot; /* for trigger output tuples */
TupleTableSlot *es_trig_oldtup_slot; /* for trigger old tuples */
TupleTableSlot *es_trig_oldtup_slot; /* for TriggerEnabled */
TupleTableSlot *es_trig_newtup_slot; /* for TriggerEnabled */
/* Parameter info: */
ParamListInfo es_param_list_info; /* values of external params */