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From: Gregory Stark <stark@enterprisedb.com>
To: "Andreas Joseph Krogh" <andreak@officenet.no>
Cc: <pgsql-sql@postgresql.org>
Subject: Re: PG won't use index on ORDER BY <expression>
In-Reply-To: <200708092018.44111.andreak@officenet.no> (Andreas Joseph Krogh's
	message of "Thu, 9 Aug 2007 20:18:43 +0200")
Organization: EnterpriseDB
References: <200708092018.44111.andreak@officenet.no>
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"Andreas Joseph Krogh" <andreak@officenet.no> writes:

> I create an index:
> CREATE INDEX person_lowerfullname_idx ON 
> person((lower(COALESCE(firstname, '')) || lower(COALESCE(lastname, ''))) 
> varchar_pattern_ops);

Why are you declaring it using the varchar_pattern_ops?

The default operator set is the one you want for handling ordering. The
pattern_ops operator set is for handling things like x LIKE 'foo%'

-- 
  Gregory Stark
  EnterpriseDB          http://www.enterprisedb.com