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From: Tom Lane <tgl@sss.pgh.pa.us>
To: marcos sicat <marcos.sicat@atlasifs.com>
Cc: Pavel Stehule <pavel.stehule@gmail.com>
Cc: pgsql-bugs@lists.postgresql.org <pgsql-bugs@lists.postgresql.org>
Subject: Re: Postgres 17.4 is much slower than Postgres 15.12 using RECURSIVE
Date: Mon, 28 Apr 2025 09:59:17 -0400
Message-ID: <775999.1745848757@sss.pgh.pa.us> (raw)
In-Reply-To: <MW5PR84MB2227BFE47602F2AAED04A0B3F2812@MW5PR84MB2227.NAMPRD84.PROD.OUTLOOK.COM>
References: <MW5PR84MB2227AA8FFF0ACD8E02F14F1AF2862@MW5PR84MB2227.NAMPRD84.PROD.OUTLOOK.COM>
	<CAFj8pRBygw-a5+LdeWSW=8N091=i2Tgmx=73ORyTv6ksT3Zw5w@mail.gmail.com>
	<MW5PR84MB2227BFE47602F2AAED04A0B3F2812@MW5PR84MB2227.NAMPRD84.PROD.OUTLOOK.COM>

marcos sicat <marcos.sicat@atlasifs.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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