From: Tom Lane <tgl@sss.pgh.pa.us>
To: Scott Ribe <scott_ribe@elevated-dev.com>
Cc: Pgsql-admin <pgsql-admin@lists.postgresql.org>
Subject: Re: regression in PG 15.1
Date: Mon, 28 Nov 2022 09:44:50 -0500
Message-ID: <543106.1669646690@sss.pgh.pa.us> (raw)
In-Reply-To: <D86D21A2-20CB-4E28-AF0A-8C2C0139DA97@elevated-dev.com>
References: <D86D21A2-20CB-4E28-AF0A-8C2C0139DA97@elevated-dev.com>
Scott Ribe <scott_ribe@elevated-dev.com> writes:
> select * from tbl where txid > something and tbl_id = (select id from reftbl where name = 'someval');
> ^^^ fails to exclude partitions, kicks off parallel scans on all 142, takes 23,170ms
Why do you say this is a regression? From what I know of the partition
pruning logic (admittedly not a whole lot), I don't think we'd have
ever pruned on the basis of such a constraint.
regards, tom lane
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To: pgsql-admin@postgresql.org
Cc: tgl@sss.pgh.pa.us, scott_ribe@elevated-dev.com, pgsql-admin@lists.postgresql.org
Subject: Re: regression in PG 15.1
In-Reply-To: <543106.1669646690@sss.pgh.pa.us>
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