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Implement syntax for transition tables in AFTER triggers.

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This is infrastructure for the complete SQL standard feature.  No
support is included at this point for execution nodes or PLs.  The
intent is to add that soon.

As this patch leaves things, standard syntax can create tuplestores
to contain old and/or new versions of rows affected by a statement.
References to these tuplestores are in the TriggerData structure.
C triggers can access the tuplestores directly, so they are usable,
but they cannot yet be referenced within a SQL statement.
This commit is contained in:
Kevin Grittner
2016-11-04 10:49:50 -05:00
parent 69d590fffb
commit 8c48375e5f
16 changed files with 580 additions and 43 deletions
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5
src/backend/commands/tablecmds.c
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@ -7430,7 +7430,7 @@ validateForeignKeyConstraint(char *conname,
trig.tgconstraint = constraintOid;
trig.tgdeferrable = FALSE;
trig.tginitdeferred = FALSE;
/* we needn't fill in tgargs or tgqual */
/* we needn't fill in remaining fields */
/*
* See if we can do it with a single LEFT JOIN query. A FALSE result
@ -7514,6 +7514,7 @@ CreateFKCheckTrigger(Oid myRelOid, Oid refRelOid, Constraint *fkconstraint,
}
fk_trigger->columns = NIL;
fk_trigger->transitionRels = NIL;
fk_trigger->whenClause = NULL;
fk_trigger->isconstraint = true;
fk_trigger->deferrable = fkconstraint->deferrable;
@ -7557,6 +7558,7 @@ createForeignKeyTriggers(Relation rel, Oid refRelOid, Constraint *fkconstraint,
fk_trigger->timing = TRIGGER_TYPE_AFTER;
fk_trigger->events = TRIGGER_TYPE_DELETE;
fk_trigger->columns = NIL;
fk_trigger->transitionRels = NIL;
fk_trigger->whenClause = NULL;
fk_trigger->isconstraint = true;
fk_trigger->constrrel = NULL;
@ -7611,6 +7613,7 @@ createForeignKeyTriggers(Relation rel, Oid refRelOid, Constraint *fkconstraint,
fk_trigger->timing = TRIGGER_TYPE_AFTER;
fk_trigger->events = TRIGGER_TYPE_UPDATE;
fk_trigger->columns = NIL;
fk_trigger->transitionRels = NIL;
fk_trigger->whenClause = NULL;
fk_trigger->isconstraint = true;
fk_trigger->constrrel = NULL;