Re: suggestions to improve postgresql suitability for data-mining

From: Bruno Wolff III <bruno(at)wolff(dot)to>
To: Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr>
Cc: PostgreSQL Developers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: suggestions to improve postgresql suitability for data-mining
Date: 2003-07-22 17:43:58
Message-ID: 20030722174358.GA4324@wolff.to
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On Tue, Jul 22, 2003 at 18:39:33 +0200,
Fabien COELHO <coelho(at)cri(dot)ensmp(dot)fr> wrote:
>
> As the resulting table is very small, I wish the optimizer would have
> skipped the sort phase, so as to aggregate the data as they come after the
> join. All may be done on the fly without much additionnal storage (well,
> with some implementation efforts). Maybe it is the "hash evaluation of
> group by aggregates" item listed in the todo list.

Yes the hash aggregate addition may help you. This has been implemented
in 7.4 which will be in beta shortly.

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