From: Tom Lane <tgl@sss.pgh.pa.us>
To: Alvaro Herrera <alvherre@alvh.no-ip.org>
Cc: Alexander Korotkov <aekorotkov@gmail.com>
Cc: Junwang Zhao <zhjwpku@gmail.com>
Cc: Andrei Lepikhov <lepihov@gmail.com>
Cc: pgsql-bugs@lists.postgresql.org <pgsql-bugs@lists.postgresql.org>
Cc: Tomas Vondra <tomas@vondra.me>
Subject: Re: Incorrect calculation of path fraction value in MergeAppend
Date: Sun, 18 May 2025 10:28:58 -0400
Message-ID: <2259060.1747578538@sss.pgh.pa.us> (raw)
In-Reply-To: <202505181223.ioge4lxntliv@alvherre.pgsql>
References: <202505181223.ioge4lxntliv@alvherre.pgsql>
Alvaro Herrera <alvherre@alvh.no-ip.org> writes:
> Personally I can see getting this in 18beta2 without too much additional
> arguing for it. But for 15-17 you'd need a lot more support than is
> evident in this thread.
+1. The bar for causing plan changes in back branches is very high.
Unless you can show that the buggy behavior is causing wrong answers,
it's usually best to leave it alone.
regards, tom lane
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To: pgsql-bugs@postgresql.org
Cc: tgl@sss.pgh.pa.us, alvherre@alvh.no-ip.org, aekorotkov@gmail.com, zhjwpku@gmail.com, lepihov@gmail.com, pgsql-bugs@lists.postgresql.org, tomas@vondra.me
Subject: Re: Incorrect calculation of path fraction value in MergeAppend
In-Reply-To: <2259060.1747578538@sss.pgh.pa.us>
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