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Minor code rearrangement to save a few cycles in RI_FKey_check when 

the subject tuple is already deleted: we need not open the pk_rel
until after we check that.
This commit is contained in:
Tom Lane 2006-08-21 19:15:29 +00:00
parent 548237fc84
commit d7c310c1fa
1 changed files with 13 additions and 13 deletions
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26
src/backend/utils/adt/ri_triggers.c
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@ -17,7 +17,7 @@
*
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/backend/utils/adt/ri_triggers.c,v 1.86 2006/07/14 14:52:24 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/ri_triggers.c,v 1.87 2006/08/21 19:15:29 tgl Exp $
*
* ----------
*/
@ -193,17 +193,11 @@ RI_FKey_check(PG_FUNCTION_ARGS)
*/
ri_CheckTrigger(fcinfo, "RI_FKey_check", RI_TRIGTYPE_INUP);
/*
* Get arguments.
*/
tgnargs = trigdata->tg_trigger->tgnargs;
tgargs = trigdata->tg_trigger->tgargs;
/*
* Get the relation descriptors of the FK and PK tables and the new tuple.
*
* pk_rel is opened in RowShareLock mode since that's what our eventual
* SELECT FOR SHARE will get on it.
*/
pk_rel = heap_open(trigdata->tg_trigger->tgconstrrelid, RowShareLock);
fk_rel = trigdata->tg_relation;
if (TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event))
{
old_row = trigdata->tg_trigtuple;
@ -224,10 +218,16 @@ RI_FKey_check(PG_FUNCTION_ARGS)
*/
Assert(new_row_buf != InvalidBuffer);
if (!HeapTupleSatisfiesItself(new_row->t_data, new_row_buf))
{
heap_close(pk_rel, RowShareLock);
return PointerGetDatum(NULL);
}
/*
* Get the relation descriptors of the FK and PK tables.
*
* pk_rel is opened in RowShareLock mode since that's what our eventual
* SELECT FOR SHARE will get on it.
*/
fk_rel = trigdata->tg_relation;
pk_rel = heap_open(trigdata->tg_trigger->tgconstrrelid, RowShareLock);
/* ----------
* SQL3 11.9 <referential constraint definition>