Date: Tue, 1 Apr 2025 12:46:02 +0200
From: Christoph Berg <myon@debian.org>
To: Luca Vallisa <luca.vallisa@gmail.com>
Cc: pgsql-bugs@lists.postgresql.org
Subject: Re: Self referential foreign keys in partitioned table not working
 as expected
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Re: Luca Vallisa
> The provided version throws an error.

Ok, I can confirm this.

This throws an error like it should:

create table test (
    id_1 int4 not null,
    id_2 int4 not null,
    parent_id_2 int4 null,
    primary key (id_1, id_2),
    foreign key (id_1, parent_id_2) references test (id_1, id_2)
);
insert into test values (1, 1, null), (1, 2, 1);
delete from test where (id_1, id_2) = (1, 1);

On a partitioned table, it does not throw the error:

create table test (
    id_1 int4 not null,
    id_2 int4 not null,
    parent_id_2 int4 null,
    primary key (id_1, id_2),
    foreign key (id_1, parent_id_2) references test (id_1, id_2)
) partition by list (id_1);
create table test_1 partition of test for values in (1);
insert into test values (1, 1, null), (1, 2, 1);
delete from test where (id_1, id_2) = (1, 1);

Christoph