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Test for optimizer

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To: Postgres General Postgres General <pgsql-general@xxxxxxxxxxxxxx>
Subject: Test for optimizer
From: 纪晓曦 <sheepjxx@xxxxxxxxx>
Date: Thu, 15 Oct 2009 00:22:26 +1100

I want to test the optimizer of postgresql.
Can anyone give me any idea about which kinds of query I should test?
large query for path an geqo?
subquery?

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