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From: Josh Berkus <josh@agliodbs.com>
To: Michael Glaesmann <grzm@myrealbox.com>
To: pgsql-novice@postgresql.org
Subject: Re: Functional index problems. (Was: Many joins: monthly summaries S-L--O--W)
Date: Wed, 22 Oct 2003 10:53:56 -0700
Message-ID: <200310221053.56665.josh@agliodbs.com> (raw)
In-Reply-To: <461424BA-04B2-11D8-81AE-0005029FC1A7@myrealbox.com>
References: <461424BA-04B2-11D8-81AE-0005029FC1A7@myrealbox.com>

Michael,

> What is that simple thing I'm overlooking? Any ideas what else I should 
> check? (I did a search on 'functional index' in the list archives but 
> kept getting timed out :(

Oh, sorry.  There's an implementation issue with funcional indexes, where they 
can't take parameters other than column names.  So you need to do:

CREATE FUNCTION get_month (
	TIMESTAMPTZ ) RETURNS INTEGER AS 
' SELECT EXTRACT(MONTH from $1); '
LANGUAGE sql IMMUTABLE STRICT;

Then do 

CREATE INDEX dborders_date_trunc_idx on dborders 
(get_month(date));


-- 
-Josh Berkus
 Aglio Database Solutions
 San Francisco

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