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From: Alexander Lakhin <[email protected]>
To: Robert Haas <[email protected]>
To: Melanie Plageman <[email protected]>
Cc: Nathan Bossart <[email protected]>
Cc: Tom Lane <[email protected]>
Cc: Lukas Fittl <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Cc: heikki.linnakangas <[email protected]>
Subject: Re: pg_plan_advice
Date: Tue, 14 Apr 2026 21:00:01 +0300
Message-ID: <[email protected]> (raw)
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13.04.2026 19:01, Robert Haas wrote:
> Sounds like we have a consensus. I have committed the three bug-fix
> patches (unrelated to the retry-loop stuff) ...

Thanks again for committing these fixes, Robert! With all the fixes in
place, I and SQLsmith have reached another error:
CREATE TABLE t1(a int);
CREATE TABLE t2(b int);

SELECT 1 FROM t1 WHERE EXISTS
   (SELECT 1 FROM
     (SELECT 1 FROM
       (SELECT 1) LEFT JOIN t2 ON true),
     t2 WHERE a = b);

ERROR:  XX000: unique semijoin found for relids (b 3 5 7) but not observed during planning
LOCATION:  pgpa_plan_walker, pgpa_walker.c:153

Could you please have a look?

Best regards,
Alexander

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