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From: Teodor Sigaev <teodor@sigaev.ru>
To: Jeff Davis <pgsql@j-davis.com>
Cc: Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Pgsql Hackers <pgsql-hackers@postgresql.org>
Subject: Re: [PATCHES] GIN improvements
Date: Thu, 22 Jan 2009 15:21:48 +0300
Message-ID: <497864DC.5080800@sigaev.ru> (raw)
In-Reply-To: <1232561271.23793.46.camel@jdavis>
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>

>> BTW, gincostestimate could use that information for cost estimation, but is 
>> index opening and metapge reading in amcostestimate acceptable?
> 
> That sounds reasonable to me. I think that's what the index-specific
> cost estimators are for. 

Done.

> Do you expect a performance impact?

I'm afraid for that and will test tomorrow. But statistic from index is exact.

-- 
Teodor Sigaev                                   E-mail: teodor@sigaev.ru
                                                    WWW: http://www.sigaev.ru/

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