Self referential foreign keys in partitioned table not working as expected

From: Luca Vallisa <luca(dot)vallisa(at)gmail(dot)com>
To: pgsql-bugs(at)lists(dot)postgresql(dot)org
Subject: Self referential foreign keys in partitioned table not working as expected
Date: 2025-04-01 09:06:13
Message-ID: CAAT=myvsiF-Attja5DcWoUWh21R12R-sfXECY2-3ynt8kaOqjw@mail.gmail.com
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As mentioned at
https://www.postgresql.org/message-id/18156-a44bc7096f0683e6%40postgresql.org
this is a regression introduced in version 15.X and still present in 17.4.

I'm running the postgres:17.4-alpine docker official image.

-------------------------------------------------------------------------------------
REPRO
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drop table if exists test;

create table test (
id_1 int4 not null,
id_2 int4 not null,
parent_id_1 int4 null,
primary key (id_1, id_2),
foreign key (parent_id_1, id_2) references test(id_1, id_2)
) partition by list(id_1);

create table test_1 partition of test for values in (1);
create table test_9 partition of test for values in (9);

insert into test values (1, 1, null), (1, 2, 1);

-- doesn't trigger an error
-- delete from test where (id_1, id_2) = (1, 1);

-- doesn't trigger an error
-- update test set id_1 = 9 where (id_1, id_2) = (1, 1);

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Both deletion and update runs smoothly.
Also, potential cascade delete and cascade update rules are ignored.

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