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Re: TwoPO: experimental join order algorithm

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Adriano Lange <alange0001(at)gmail(dot)com>
Cc: Pg Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: TwoPO: experimental join order algorithm
Date: 2010-07-25 21:44:00
Message-ID: (view raw or whole thread)
Lists: pgsql-hackers
On Sat, Jul 24, 2010 at 9:20 AM, Adriano Lange <alange0001(at)gmail(dot)com> wrote:
> I'd like to release the last version of my experimental join order
> algorithm (TwoPO - Two Phase Optimization [1]):
> This algorithm is not production-ready, but an experimental set of
> ideas, which need to be refined and evaluated. As the join order
> optimization is a hard problem, the evaluation of a search strategy is
> also a hard task. Therefore, I think the most important TODO item
> related to replacement of GEQO algorithm is to define a set of
> evaluation criteria considered as relevant.

As you may know, we're in the middle of a CommitFest right now; I'd
suggest adding this patch to the next one.

Someone might have time to look at it sooner, but at least if you add
it here we'll not lose track of it.

Robert Haas
The Enterprise Postgres Company

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