Re: BUG #18541: Reattaching a partition referenced by a foreign key fails with an error

On 2024-Jul-15, Tender Wang wrote:

> PG Bug reporting form <noreply(at)postgresql(dot)org> 于2024年7月15日周一 21:02写道：
>
> > The following script:
> > CREATE TABLE t1 (a int, PRIMARY KEY (a));
> > CREATE TABLE t (a int, PRIMARY KEY (a), FOREIGN KEY (a) REFERENCES t1)
> > PARTITION BY LIST (a);
> > ALTER TABLE t ATTACH PARTITION t1 FOR VALUES IN (1);
> > ALTER TABLE t DETACH PARTITION t1;
> > ALTER TABLE t ATTACH PARTITION t1 FOR VALUES IN (1);
> >
> > ends up with the error complaining about check triggers:
> > ERROR: XX000: could not find ON INSERT check triggers of foreign key
> > constraint 16400
> > LOCATION: GetForeignKeyCheckTriggers, tablecmds.c:11260

> I saw the same error in [1]. I guess it is same issue.
> I send a patch in [1], but it may need a more work.

I think this schema is nuts. Do you have a practical use for something
like this?

I am tempted to fix this by dictating that you can't join a table as a
partition if the partitioned table contains an FK that references that
table.

FWIW the patch I have fixes all the other reported problems with FKs and
partitioned tables, but not this one.

--
Álvaro Herrera PostgreSQL Developer — https://www.EnterpriseDB.com/