From: | Andres Freund <andres(at)2ndquadrant(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Josh Berkus <josh(at)agliodbs(dot)com>, Grzegorz Parka <grzegorz(dot)parka(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Jan Urbański <wulczer(at)wulczer(dot)org> |
Subject: | Re: GSoC idea - Simulated annealing to search for query plans |
Date: | 2015-02-27 01:27:52 |
Message-ID: | 20150227012752.GQ24199@awork2.anarazel.de |
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Lists: | pgsql-hackers |
On 2015-02-26 20:23:33 -0500, Tom Lane wrote:
> Josh Berkus <josh(at)agliodbs(dot)com> writes:
> > On 02/26/2015 01:59 PM, Grzegorz Parka wrote:
> >> I'm interested in one of old TODO items related to the optimizer -
> >> 'Consider compressed annealing to search for query plans'.
>
> > You might look at the earlier attempt to make the GEQO replacement
> > "pluggable". That project failed to complete sufficiently to be a
> > feature though, but it did enough to show that our current GEQO
> > implementation was suboptimal.
>
> > I'm currently searching for this project ... it was a GSOC project, but
> > I think before they required posting to Google Code.
>
> I seem to recall somebody demo'ing a simulated-annealing GEQO replacement
> at PGCon a couple years back. It never got to the point of being a
> submitted patch though.
Yea, it was Jan Urbański (CCed).
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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