From: PG Bug reporting form <noreply@postgresql.org>
To: pgsql-bugs@lists.postgresql.org
Cc: exclusion@gmail.com
Subject: BUG #18652: Planner can not find pathkey item to sort for query with expression and expression index
Date: Wed, 09 Oct 2024 21:00:01 +0000
Message-ID: <18652-deaa782ebcca85d1@postgresql.org> (raw)
The following bug has been logged on the website:
Bug reference: 18652
Logged by: Alexander Lakhin
Email address: exclusion@gmail.com
PostgreSQL version: 17.0
Operating system: Ubuntu 22.04
Description:
The following query:
CREATE TABLE t(i int, j int);
CREATE INDEX idx on t((i + 0));
SELECT * FROM t,
(SELECT i + 0 AS i FROM
(SELECT i FROM t UNION ALL SELECT i + 1 FROM t) AS t1
) AS t2
WHERE t2.i = t.j;
fails with:
ERROR: XX000: could not find pathkey item to sort
LOCATION: prepare_sort_from_pathkeys, createplan.c:6350
The error occurs only when the expression in SELECT i + 0 AS i FROM
matches the expression in an index.
Reproduced on REL_10_STABLE .. master.
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Subject: Re: BUG #18652: Planner can not find pathkey item to sort for query with expression and expression index
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