From: Marcin Mirosław <marcin@mejor.pl>
To: Szymon Guz <mabewlun@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: [planner] Ignore "order by" in subselect if parrent do count(*)
Date: Thu, 01 Mar 2012 13:19:03 +0100
Message-ID: <4F4F6937.4090200@mejor.pl> (raw)
In-Reply-To: <CAFjNrYu7TiRXZY31Phcb-cfXkBKEGm4FvGbZ2nn31e15n_o1cg@mail.gmail.com>
References: <4F4F6158.7060200@mejor.pl>
<CAFjNrYvECD+kDVfo76s8zHsfb0E0G7CkGH2boyHT7rgpkFBS7Q@mail.gmail.com>
<4F4F6550.4010705@mejor.pl>
<CAFjNrYu7TiRXZY31Phcb-cfXkBKEGm4FvGbZ2nn31e15n_o1cg@mail.gmail.com>
W dniu 01.03.2012 13:09, Szymon Guz pisze:
> Could you provide the postgres version and the structure of
> users_profile table (with indexes)?
Argh, i forgot about version. It's postgresql-9.1.3.
I don't think structre of users_profile is important here. Me idea is
let planner ignore sorting completly. I don't want to have sort quicker
(in this case, surely;)), i'd like to skip sorting completly because it
doesn't influence for query result.
Table isn't "real life", it only demonstrates than planner sometimes can
safely skip some steps.
Regards,
Marcin
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To: pgsql-performance@postgresql.org
Cc: marcin@mejor.pl, mabewlun@gmail.com
Subject: Re: [planner] Ignore "order by" in subselect if parrent do count(*)
In-Reply-To: <4F4F6937.4090200@mejor.pl>
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