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Add a WHEN clause to CREATE TRIGGER, allowing a boolean expression to be

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checked to determine whether the trigger should be fired.

For BEFORE triggers this is mostly a matter of spec compliance; but for AFTER
triggers it can provide a noticeable performance improvement, since queuing of
a deferred trigger event and re-fetching of the row(s) at end of statement can
be short-circuited if the trigger does not need to be fired.

Takahiro Itagaki, reviewed by KaiGai Kohei.
This commit is contained in:
Tom Lane
2009-11-20 20:38:12 +00:00
parent 201a45c4fa
commit 7fc0f06221
27 changed files with 783 additions and 100 deletions
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11
src/backend/commands/copy.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/copy.c,v 1.317 2009/09/21 20:10:21 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/copy.c,v 1.318 2009/11/20 20:38:10 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1799,8 +1799,12 @@ CopyFrom(CopyState cstate)
resultRelInfo->ri_RelationDesc = cstate->rel;
resultRelInfo->ri_TrigDesc = CopyTriggerDesc(cstate->rel->trigdesc);
if (resultRelInfo->ri_TrigDesc)
{
resultRelInfo->ri_TrigFunctions = (FmgrInfo *)
palloc0(resultRelInfo->ri_TrigDesc->numtriggers * sizeof(FmgrInfo));
resultRelInfo->ri_TrigWhenExprs = (List **)
palloc0(resultRelInfo->ri_TrigDesc->numtriggers * sizeof(List *));
}
resultRelInfo->ri_TrigInstrument = NULL;
ExecOpenIndices(resultRelInfo);
@ -1810,7 +1814,8 @@ CopyFrom(CopyState cstate)
estate->es_result_relation_info = resultRelInfo;
/* Set up a tuple slot too */
slot = MakeSingleTupleTableSlot(tupDesc);
slot = ExecInitExtraTupleSlot(estate);
ExecSetSlotDescriptor(slot, tupDesc);
econtext = GetPerTupleExprContext(estate);
@ -2198,7 +2203,7 @@ CopyFrom(CopyState cstate)
pfree(defmap);
pfree(defexprs);
ExecDropSingleTupleTableSlot(slot);
ExecResetTupleTable(estate->es_tupleTable, false);
ExecCloseIndices(resultRelInfo);