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Subject: BUG #19580: Can not FINALIZE detach partition. Table in stuck
To: pgsql-bugs@lists.postgresql.org
From: PG Bug reporting form <noreply@postgresql.org>
Cc: o15611@gmail.com
Reply-To: o15611@gmail.com, pgsql-bugs@lists.postgresql.org
Date: Sat, 25 Jul 2026 07:24:18 +0000
Message-ID: <19580-4baeeaaf5407a60d@postgresql.org>
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The following bug has been logged on the website:

Bug reference:      19580
Logged by:          Oleg Ivanov
Email address:      o15611@gmail.com
PostgreSQL version: 18.4
Operating system:   Linux
Description:       =20

drop table if exists t;
CREATE TABLE t (id bigint GENERATED BY DEFAULT AS IDENTITY, reg int, primary
key (id, reg)) PARTITION BY RANGE (id);
CREATE TABLE t1 PARTITION OF t FOR VALUES FROM (1) TO (20) PARTITION BY
RANGE(reg);
CREATE TABLE t11 PARTITION OF t1 FOR VALUES FROM (1) TO (10);
ALTER TABLE t DETACH PARTITION t1;
ALTER TABLE t ATTACH PARTITION t1 FOR VALUES FROM (1) TO (20);

"generated by default as identity" was added only to t1 and not in t11.
But, the problem is:
ALTER TABLE t DETACH PARTITION t1 CONCURRENTLY;
ERROR:  column "id" of relation "t11" is not an identity column

I can not find a statement to FINALIZE detach:

ALTER TABLE t DETACH PARTITION t1;
ERROR:  cannot detach partition "t1"
DETAIL:  The partition is being detached concurrently or has an unfinished
detach.
HINT:  Use ALTER TABLE ... DETACH PARTITION ... FINALIZE to complete the
pending detach operation.
ALTER TABLE t1 DETACH PARTITION t11;
ERROR:  cannot alter partition "t1" with an incomplete detach
HINT:  Use ALTER TABLE ... DETACH PARTITION ... FINALIZE to complete the
pending detach operation.
ALTER TABLE t11 ALTER COLUMN id ADD generated by default as identity;
ERROR:  cannot add identity to a column of a partition
ALTER TABLE t1 ALTER COLUMN id drop identity;
ERROR:  cannot alter partition "t1" with an incomplete detach
HINT:  Use ALTER TABLE ... DETACH PARTITION ... FINALIZE to complete the
pending detach operation.
ALTER TABLE t11 ALTER COLUMN id drop identity;
ERROR:  cannot drop identity from a column of a partition
ALTER TABLE t ALTER COLUMN id drop identity;
ALTER TABLE
ALTER TABLE t DETACH PARTITION t1 FINALIZE;
ERROR:  column "id" of relation "t11" is not an identity column

Table in stuck.

The only way to FINALIZE is to drop section:
drop table t11;
ALTER TABLE t DETACH PARTITION t1 FINALIZE;