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From: Alexander Lakhin <exclusion@gmail.com>
To: Alexander Korotkov <aekorotkov@gmail.com>
Cc: Andrei Lepikhov <a.lepikhov@postgrespro.ru>
Cc: Gregory Stark (as CFM) <stark.cfm@gmail.com>
Cc: Michał Kłeczek <michal@kleczek.org>
Cc: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Cc: Richard Guo <guofenglinux@gmail.com>
Subject: Re: Removing unneeded self joins
Date: Tue, 9 Jan 2024 07:00:01 +0300
Message-ID: <b9e8f460-f9a6-0e9b-e8ba-60d59f0bc22c@gmail.com> (raw)
In-Reply-To: <CAPpHfdvu+wyazT+ujJbJ5rKZrHQoG+FCVeWENA4pyf_A1W1WAA@mail.gmail.com>
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	<0c5f461f-e26f-4fd9-9700-91b0e9c38fd6@postgrespro.ru>
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	<CAPpHfdvu+wyazT+ujJbJ5rKZrHQoG+FCVeWENA4pyf_A1W1WAA@mail.gmail.com>

09.01.2024 01:09, Alexander Korotkov wrote:
> Fixed in 30b4955a46.

Thank you for fixing that!

I've found another anomaly coined with d3d55ce57. This query:
CREATE TABLE t(a int PRIMARY KEY, b int);
INSERT INTO t VALUES  (1, 1), (2, 1);

WITH t1 AS (SELECT * FROM t)
UPDATE t SET b = t1.b + 1 FROM t1
WHERE t.a = t1.a RETURNING t.a, t1.b;

gives "ERROR:  variable not found in subplan target lists" on d3d55ce57, but
starting from a7928a57b it gives an incorrect result:
  a | b
---+---
  1 | 2
  2 | 2
(2 rows)


Best regards,
Alexander





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