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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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23
src/backend/utils/adt/ruleutils.c
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@ -813,6 +813,8 @@ pg_get_triggerdef_worker(Oid trigid, bool pretty)
SysScanDesc tgscan;
int findx = 0;
char *tgname;
char *tgoldtable;
char *tgnewtable;
Oid argtypes[1]; /* dummy */
Datum value;
bool isnull;
@ -924,6 +926,27 @@ pg_get_triggerdef_worker(Oid trigid, bool pretty)
appendStringInfoString(&buf, "IMMEDIATE ");
}
value = fastgetattr(ht_trig, Anum_pg_trigger_tgoldtable,
tgrel->rd_att, &isnull);
if (!isnull)
tgoldtable = NameStr(*((NameData *) DatumGetPointer(value)));
else
tgoldtable = NULL;
value = fastgetattr(ht_trig, Anum_pg_trigger_tgnewtable,
tgrel->rd_att, &isnull);
if (!isnull)
tgnewtable = NameStr(*((NameData *) DatumGetPointer(value)));
else
tgnewtable = NULL;
if (tgoldtable != NULL || tgnewtable != NULL)
{
appendStringInfoString(&buf, "REFERENCING ");
if (tgoldtable != NULL)
appendStringInfo(&buf, "OLD TABLE AS %s ", tgoldtable);
if (tgnewtable != NULL)
appendStringInfo(&buf, "NEW TABLE AS %s ", tgnewtable);
}
if (TRIGGER_FOR_ROW(trigrec->tgtype))
appendStringInfoString(&buf, "FOR EACH ROW ");
else