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From: PFC <lists@peufeu.com>
To: Richard Huxton <dev@archonet.com>
Cc: mark@mark.mielke.cc, "Mark Lewis" <mark.lewis@mir3.com>
Cc: James Mansion <james@mansionfamily.plus.com>
Cc: Magnus Hagander <magnus@hagander.net>
Cc: Alexander Staubo <alex@purefiction.net>
Cc: Andy <frum@ar-sd.net>
Cc: pgsql-performance@postgresql.org
Subject: Re: LIKE search and performance
Date: Fri, 25 May 2007 19:31:16 +0200
Message-ID: <op.tsv8aefscigqcu@apollo13> (raw)
In-Reply-To: <46571825.30707@archonet.com>
References: <009501c79d4c$445428f0$0b00a8c0@mpsro.dom>
	<88daf38c0705230905u1a981102k691b47bd36011a80@mail.gmail.com>
	<4655DE75.4080506@mansionfamily.plus.com>
	<4655E64B.5050503@hagander.net>
	<4655FB8A.1040707@mansionfamily.plus.com>
	<1180040560.31471.262.camel@archimedes>
	<20070524215450.GA3858@mark.mielke.cc>
	<46569AA5.10205@archonet.com>
	<20070525141630.GA12162@mark.mielke.cc>
	<4657023A.20209@archonet.com>
	<op.tsv6fevgcigqcu@apollo13>
	<46571825.30707@archonet.com>

> None of which address the question of what plan PG should produce for:  
> SELECT * FROM bigtable WHERE foo LIKE 's%'

	Ah, this one already uses the btree since the '%' is at the end.
	My point is that a search like this will yield too many results to be  
useful to the user anyway, so optimizing its performance is a kind of red  
herring.

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