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: Fri, 10 Aug 2007 04:10:47 +0100
Message-ID: <87abt0rsnc.fsf@oxford.xeocode.com> (raw)
In-Reply-To: <200708092238.46284.andreak@officenet.no>
References: <200708092018.44111.andreak@officenet.no>
<87fy2s1nrd.fsf@oxford.xeocode.com>
<200708092238.46284.andreak@officenet.no>
"Andreas Joseph Krogh" <andreak@officenet.no> writes:
> Ooops, just fugured that out. But - it still doesn't use the index if I remove
> the "varchar_pattern_ops". I solved it by adding a function:
Hm, well it does for me, you would have to post your explain analyze to see
what's going on.
> Another question then: Why doesn't "varchar_pattern_ops" handle ordering? This
> means I need 2 indexes on the columns I want to match with LIKE and ORDER BY.
> Just doesn't seem right to need 2 "similar" indexes...
If you initd in the C locale you only need one index. In other locales the
collation order and the pattern order are different.
--
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: <87abt0rsnc.fsf@oxford.xeocode.com>
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