The type int8 and the use of indexes

From: nfj(at)radix(dot)com
To: pgsql-general(at)postgresql(dot)org
Subject: The type int8 and the use of indexes
Date: 2001-01-25 22:10:06
Message-ID: 980460606.3a70a43e92822@gandalf.radix.com.br
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Hi,

I realized that PostgreSQL (7.0.3) optimizer doesn´t use indexes in a query
like "select * from my table where pk=1", where the field pk is of type int8.
I changed the type to int4, and now it uses the index (a lot faster). I also
tryed changing the type to numeric, with the same results.
Why does it happen? Is there something special with type int8 ???

Thanks,
Nelson

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