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>
Date: Thu, 09 Aug 2007 21:00:54 +0100
Message-ID: <87fy2s1nrd.fsf@oxford.xeocode.com> (raw)
In-Reply-To: <200708092018.44111.andreak@officenet.no>
References: <200708092018.44111.andreak@officenet.no>
"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
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To: pgsql-sql@postgresql.org
Cc: stark@enterprisedb.com, andreak@officenet.no
Subject: Re: PG won't use index on ORDER BY <expression>
In-Reply-To: <87fy2s1nrd.fsf@oxford.xeocode.com>
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