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help / color / mirror / Atom feedFrom: Robert Haas <[email protected]>
To: Ajay Pal <[email protected]>
Cc: Alexandra Wang <[email protected]>
Cc: Richard Guo <[email protected]>
Cc: Lukas Fittl <[email protected]>
Cc: Tom Lane <[email protected]>
Cc: Jacob Champion <[email protected]>
Cc: Dian Fay <[email protected]>
Cc: Matheus Alcantara <[email protected]>
Cc: Jakub Wartak <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: pg_plan_advice
Date: Thu, 12 Feb 2026 08:08:16 -0500
Message-ID: <CA+TgmoYg8Ft9CZWD2GVGn1Qt6EQTuHUuG_MkDaQ6XGD1doTK0w@mail.gmail.com> (raw)
In-Reply-To: <CABRHmyuOhEjPSpej424UyridA9_knDcBEyL3_BVB1u=yDSOTKw@mail.gmail.com>
References: <CA+TgmoZ-Jh1T6QyWoCODMVQdhTUPYkaZjWztzP1En4=ZHoKPzw@mail.gmail.com>
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<CA+TgmoaCdsuvNn6T6SfQ_0YD2Hh2+hgTXh9fTGHQhPg1zvy2rQ@mail.gmail.com>
<CABRHmyuOhEjPSpej424UyridA9_knDcBEyL3_BVB1u=yDSOTKw@mail.gmail.com>
On Thu, Feb 12, 2026 at 6:41 AM Ajay Pal <[email protected]> wrote:
> pg_plan_advice failed to match JOIN_ORDER advice because the genetic
> algorithm never attempts the specific join path requested.
Seems expected. It is bad if using GEQO results in a crash or if the
advice cause the expected outcome when the path is considered, but if
the randomness of GEQO causes it not to consider the path the user
wants, then the user either needs to stop using GEQO, or use
less-strict plan advice, or just understand that this kind of outcome
is a possibility.
Thanks,
--
Robert Haas
EDB: http://www.enterprisedb.com
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Subject: Re: pg_plan_advice
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