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From: Jeff Davis <pgsql@j-davis.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Teodor Sigaev <teodor@sigaev.ru>
Cc: Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>
Cc: Pgsql Hackers <pgsql-hackers@postgresql.org>
Subject: Re: [PATCHES] GIN improvements
Date: Wed, 04 Feb 2009 10:39:07 -0800
Message-ID: <1233772747.3805.2.camel@dell.linuxdev.us.dell.com> (raw)
In-Reply-To: <16080.1233625091@sss.pgh.pa.us>
References: <483FD205.4090904@sigaev.ru>
	<486BC501.6060605@sigaev.ru>
	<27880.1215810535@sss.pgh.pa.us>
	<487A6E0C.3090600@sigaev.ru>
	<8993.1216843701@sss.pgh.pa.us>
	<4888A594.6010102@sigaev.ru>
	<490B07BA.6030109@sigaev.ru>
	<492F04D9.5070404@enterprisedb.com>
	<4942A137.3000502@sigaev.ru>
	<1229910966.2285.76.camel@jdavis>
	<49708008.8070109@sigaev.ru>
	<1232348905.7281.114.camel@jdavis>
	<4974B002.3040202@sigaev.ru>
	<1232474489.23316.8.camel@jdavis>
	<49770FD4.5030600@sigaev.ru>
	<1232561271.23793.46.camel@jdavis>
	<497864DC.5080800@sigaev.ru>
	<4979BAF8.1000501@sigaev.ru>
	<16080.1233625091@sss.pgh.pa.us>

On Mon, 2009-02-02 at 20:38 -0500, Tom Lane wrote:
> Also, I really think it's a pretty bad idea to make index cost
> estimation depend on the current state of the index's pending list
> --- that state seems far too transient to base plan choices on.

I'm confused by this. Don't we want to base the plan choice on the most
current data, even if it is transient?

Regards,
	Jeff Davis




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