Re: Postgres 17.4 is much slower than Postgres 15.12 using RECURSIVE

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: marcos sicat <marcos(dot)sicat(at)atlasifs(dot)com>
Cc: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, "pgsql-bugs(at)lists(dot)postgresql(dot)org" <pgsql-bugs(at)lists(dot)postgresql(dot)org>
Subject: Re: Postgres 17.4 is much slower than Postgres 15.12 using RECURSIVE
Date: 2025-04-28 13:59:17
Message-ID: 775999.1745848757@sss.pgh.pa.us
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marcos sicat <marcos(dot)sicat(at)atlasifs(dot)com> writes:
> The function is the same between v15 and v17. Is there a subtle difference in performance for nested subqueries in v17?

Your next step should be to compare the plans for the function's
query. The auto_explain or pg_stat_statements extensions could
be used to check that in-situ, if manually EXPLAINing that query
doesn't yield insight.

regards, tom lane

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