Re: v16 regression - wrong query results with LEFT JOINs + join removal

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: v16 regression - wrong query results with LEFT JOINs + join removal
Date: 2023-05-11 15:50:24
Message-ID: CA+TgmoZyHcOfcDnew3sk9exgG9bksLckTJqM2d2EC_5O8uExLQ@mail.gmail.com
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On Thu, May 11, 2023 at 10:14 AM Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> Ouch, so we've had a known queries-returning-wrong-answers bug for
> more than two months. That's not great. I'll try to find time today to
> check whether the patches on that thread resolve this issue.

I tried out the v3 patches from that thread and they don't seem to
make any difference for me in this test case. So either (1) it's a
different issue or (2) those patches don't fully fix it or (3) I'm bad
at testing things.

--
Robert Haas
EDB: http://www.enterprisedb.com

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