plpgsql and index usage

From: Ryan Mahoney <ryan(at)flowlabs(dot)com>
To: PostgreSQL-development <pgsql-hackers(at)postgreSQL(dot)org>
Subject: plpgsql and index usage
Date: 2002-12-20 22:35:19
Message-ID: 1040423719.1573.80.camel@localhost.localdomain
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The following statements do not utilize an index when executed inside a
plpgsql procedure, but does when executed interactively in psql!

Does not use index:

FOR somemorerows IN
SELECT zipcode_list
FROM pa_zipcode_proximity
WHERE zipcode = zipcode_in
AND proximity <= proximity_range_in
LOOP
zipcodes := zipcodes || '','' || somemorerows.zipcode_list;
END LOOP;

However:
SELECT zipcode_list
FROM pa_zipcode_proximity
WHERE zipcode = zipcode_in
AND proximity <= proximity_range_in;

Does use the index! zipcode_list and zipcode are text, proximity is an
integer. There is a primary key on zipcode and proximity. We are using
PostgreSQL 7.3 on i686-pc-linux-gnu, compiled by GCC 2.96. Any ideas?
We have recently done a vacuum full and analyze.

Any help is much appreciated!

-r

--
Ryan Mahoney
ryan(at)flowlabs(dot)com
(718)721-8790

"Tomorrow's Company. Today's Budget."
http://www.flowlabs.com

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