From: | Alex Shulgin <alex(dot)shulgin(at)gmail(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | David Steele <david(at)pgmasters(dot)net>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, "Shulgin, Oleksandr" <oleksandr(dot)shulgin(at)zalando(dot)de>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> |
Subject: | Re: More stable query plans via more predictable column statistics |
Date: | 2016-04-03 18:51:04 |
Message-ID: | CAM-UEKT3UF=CFPym5WfzjOyaQLCJiP991PjfUP1GbDmhiyifng@mail.gmail.com |
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On Sun, Apr 3, 2016, 18:40 Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Alex Shulgin <alex(dot)shulgin(at)gmail(dot)com> writes:
>
> > Well, if it's the only value it will be accepted simply because we are
> > checking that special case already and don't even bother to loop through
> > the track list.
>
> That was demonstrably not the case in the failing regression test.
> I forget what aspect of the test case allowed it to get past the short
> circuit, but it definitely got into the scan-the-track-list code.
>
Hm, I'll have to see that for myself, probably there was something more to
it.
--
Alex
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