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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 14:00:22 -0500
Message-ID: <CA+TgmobRs1a3ctr=_3DozWR4Ftxb0jqrRfZR-hNiGghCcq2AXg@mail.gmail.com> (raw)
In-Reply-To: <CA+TgmoYg8Ft9CZWD2GVGn1Qt6EQTuHUuG_MkDaQ6XGD1doTK0w@mail.gmail.com>
References: <CA+TgmoZ-Jh1T6QyWoCODMVQdhTUPYkaZjWztzP1En4=ZHoKPzw@mail.gmail.com>
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<CA+TgmobwaT=PXPDDrgDup+jA8KHBbkxigtziD-zNzAKKkQYVgQ@mail.gmail.com>
<CAOYmi+mOmEW=amDRQMfw6-Fb3ZmDEQFaJzwk8Bc8W8DzaP85XQ@mail.gmail.com>
<CA+TgmoaX2AMW4cdFM3OngBJxmxpkdmzF33R7-CWhvRLfucbFMg@mail.gmail.com>
<CAOYmi+k4AyWCQHK=XVF99KVDuFkqxcADao61OWGLxu0nRYMONQ@mail.gmail.com>
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<CAP53Pkycc=7N2bLzVT3x+qE1JamvRZWev5tFjdLJ1+-AV3Di+Q@mail.gmail.com>
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<CA+TgmobzR+XMGbRosVPbjHbSo4+cgJn=qZK6w05aF1sbj=C+9Q@mail.gmail.com>
<CA+TgmoawzvCoZAwFS85tE5+c8vBkqgcS8ZstQ_ohjXQ9wGT9sw@mail.gmail.com>
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<CA+TgmoaCdsuvNn6T6SfQ_0YD2Hh2+hgTXh9fTGHQhPg1zvy2rQ@mail.gmail.com>
<CABRHmyuOhEjPSpej424UyridA9_knDcBEyL3_BVB1u=yDSOTKw@mail.gmail.com>
<CA+TgmoYg8Ft9CZWD2GVGn1Qt6EQTuHUuG_MkDaQ6XGD1doTK0w@mail.gmail.com>
On Thu, Feb 12, 2026 at 8:08 AM Robert Haas <[email protected]> wrote:
> 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
sorry, this should have said "doesn't cause"
> 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.
--
Robert Haas
EDB: http://www.enterprisedb.com
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Subject: Re: pg_plan_advice
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