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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Edmund Horner <ejrh00@gmail.com>
Cc: David Rowley <david.rowley@2ndquadrant.com>
Cc: Tomas Vondra <tomas.vondra@2ndquadrant.com>
Cc: PostgreSQL Developers <pgsql-hackers@lists.postgresql.org>
Subject: Re: Tid scan improvements
Date: Mon, 14 Jan 2019 22:54:47 -0500
Message-ID: <468.1547524487@sss.pgh.pa.us> (raw)
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Edmund Horner <ejrh00@gmail.com> writes:
> On Sat, 22 Dec 2018 at 07:10, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> I'm not entirely sure why you're bothering; surely nulltestsel is
>> unrelated to what this patch is about?

> I found that it made a difference with selectivity of range comparisons,
> because clauselist_selectivity tries to correct for it (clausesel.c:274):

Oh, I see.

> I guess we could have a standalone patch to add this for all system columns?

+1

			regards, tom lane




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