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Commite6d0d16

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committed
Don't throw an error if a queued AFTER trigger no longer exists.
afterTriggerInvokeEvents and AfterTriggerExecute have alwaystreated it as an error if the trigger OID mentioned in a queuedafter-trigger event can't be found. However, that fails toaccount for the edge case where the trigger's been dropped inthe current transaction since queueing the event. There seemsno very good reason to disallow that case, so instead silentlydo nothing if the trigger OID can't be found.This does give up a little bit of bug-detection ability, but I don'trecall that these error messages have ever actually revealed a bug,so it seems mostly theoretical. Alternatives such as markingpending events DONE at the time of dropping a trigger would becomplicated and perhaps introduce bugs of their own.Per bug #18517 from Alexander Lakhin. Back-patch to allsupported branches.Discussion:https://postgr.es/m/18517-af2d19882240902c@postgresql.org
1 parentab4346e commite6d0d16

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3 files changed

+32
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‎src/backend/commands/trigger.c

Lines changed: 7 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -4289,8 +4289,12 @@ AfterTriggerExecute(EState *estate,
42894289
boolshould_free_new= false;
42904290

42914291
/*
4292-
* Locate trigger in trigdesc.
4292+
* Locate trigger in trigdesc. It might not be present, and in fact the
4293+
* trigdesc could be NULL, if the trigger was dropped since the event was
4294+
* queued. In that case, silently do nothing.
42934295
*/
4296+
if (trigdesc==NULL)
4297+
return;
42944298
for (tgindx=0;tgindx<trigdesc->numtriggers;tgindx++)
42954299
{
42964300
if (trigdesc->triggers[tgindx].tgoid==tgoid)
@@ -4300,7 +4304,7 @@ AfterTriggerExecute(EState *estate,
43004304
}
43014305
}
43024306
if (LocTriggerData.tg_trigger==NULL)
4303-
elog(ERROR,"could not find trigger %u",tgoid);
4307+
return;
43044308

43054309
/*
43064310
* If doing EXPLAIN ANALYZE, start charging time to this trigger. We want
@@ -4681,6 +4685,7 @@ afterTriggerInvokeEvents(AfterTriggerEventList *events,
46814685
/* Catch calls with insufficient relcache refcounting */
46824686
Assert(!RelationHasReferenceCountZero(rel));
46834687
trigdesc=rInfo->ri_TrigDesc;
4688+
/* caution: trigdesc could be NULL here */
46844689
finfo=rInfo->ri_TrigFunctions;
46854690
instr=rInfo->ri_TrigInstrument;
46864691
if (slot1!=NULL)
@@ -4696,9 +4701,6 @@ afterTriggerInvokeEvents(AfterTriggerEventList *events,
46964701
slot2=MakeSingleTupleTableSlot(rel->rd_att,
46974702
&TTSOpsMinimalTuple);
46984703
}
4699-
if (trigdesc==NULL)/* should not happen */
4700-
elog(ERROR,"relation %u has no triggers",
4701-
evtshared->ats_relid);
47024704
}
47034705

47044706
/*

‎src/test/regress/expected/triggers.out

Lines changed: 11 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -3372,6 +3372,17 @@ select * from trig_table;
33723372

33733373
drop table refd_table, trig_table;
33743374
--
3375+
-- Test that we can drop a not-yet-fired deferred trigger
3376+
--
3377+
create table refd_table (id int primary key);
3378+
create table trig_table (fk int references refd_table initially deferred);
3379+
begin;
3380+
insert into trig_table values (1);
3381+
drop table refd_table cascade;
3382+
NOTICE: drop cascades to constraint trig_table_fk_fkey on table trig_table
3383+
commit;
3384+
drop table trig_table;
3385+
--
33753386
-- self-referential FKs are even more fun
33763387
--
33773388
create table self_ref (a int primary key,

‎src/test/regress/sql/triggers.sql

Lines changed: 14 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -2478,6 +2478,20 @@ select * from trig_table;
24782478

24792479
droptable refd_table, trig_table;
24802480

2481+
--
2482+
-- Test that we can drop a not-yet-fired deferred trigger
2483+
--
2484+
2485+
createtablerefd_table (idintprimary key);
2486+
createtabletrig_table (fkintreferences refd_table initially deferred);
2487+
2488+
begin;
2489+
insert into trig_tablevalues (1);
2490+
droptable refd_table cascade;
2491+
commit;
2492+
2493+
droptable trig_table;
2494+
24812495
--
24822496
-- self-referential FKs are even more fun
24832497
--

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