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Fix failures in validateForeignKeyConstraint's slow path.

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The foreign-key-checking loop in ATRewriteTables failed to ignore
relations without storage (e.g., partitioned tables), unlike the
initial loop.  This accidentally worked as long as RI_Initial_Check
succeeded, which it does in most practical cases (including all the
ones exercised in the existing regression tests :-().  However, if
that failed, as for instance when there are permissions issues,
then we entered the slow fire-the-trigger-on-each-tuple path.
And that would try to read from the referencing relation, and fail
if it lacks storage.

A second problem, recently introduced in HEAD, was that this loop
had been broken by sloppy refactoring for the tableam API changes.

Repair both issues, and add a regression test case so we have some
coverage on this code path.  Back-patch as needed to v11.

(It looks like this code could do with additional bulletproofing,
but let's get a working test case in place first.)

Hadi Moshayedi, Tom Lane, Andres Freund

Discussion: https://postgr.es/m/CAK=1=WrnNmBbe5D9sm3t0a6dnAq3cdbF1vXY816j1wsMqzC8bw@mail.gmail.com
Discussion: https://postgr.es/m/19030.1554574075@sss.pgh.pa.us
Discussion: https://postgr.es/m/20190325180405.jytoehuzkeozggxx%40alap3.anarazel.de
This commit is contained in:
Tom Lane
2019-04-06 15:09:09 -04:00
parent 249d649996
commit 46e3442c9e
3 changed files with 58 additions and 8 deletions
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15
src/backend/commands/tablecmds.c
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@ -4459,13 +4459,8 @@ ATRewriteTables(AlterTableStmt *parsetree, List **wqueue, LOCKMODE lockmode)
{
AlteredTableInfo *tab = (AlteredTableInfo *) lfirst(ltab);
/*
* Foreign tables have no storage, nor do partitioned tables and
* indexes.
*/
if (tab->relkind == RELKIND_FOREIGN_TABLE ||
tab->relkind == RELKIND_PARTITIONED_TABLE ||
tab->relkind == RELKIND_PARTITIONED_INDEX)
/* Relations without storage may be ignored here */
if (!RELKIND_HAS_STORAGE(tab->relkind))
continue;
/*
@ -4645,6 +4640,10 @@ ATRewriteTables(AlterTableStmt *parsetree, List **wqueue, LOCKMODE lockmode)
Relation rel = NULL;
ListCell *lcon;
/* Relations without storage may be ignored here too */
if (!RELKIND_HAS_STORAGE(tab->relkind))
continue;
foreach(lcon, tab->constraints)
{
NewConstraint *con = lfirst(lcon);
@ -9647,7 +9646,7 @@ validateForeignKeyConstraint(char *conname,
trigdata.type = T_TriggerData;
trigdata.tg_event = TRIGGER_EVENT_INSERT | TRIGGER_EVENT_ROW;
trigdata.tg_relation = rel;
trigdata.tg_trigtuple = ExecFetchSlotHeapTuple(slot, true, NULL);
trigdata.tg_trigtuple = ExecFetchSlotHeapTuple(slot, false, NULL);
trigdata.tg_trigslot = slot;
trigdata.tg_newtuple = NULL;
trigdata.tg_trigger = &trig;