disjunctive queries

From: andrew <andrew(dot)ylzhou(at)gmail(dot)com>
To: pgsql-general(at)postgresql(dot)org
Subject: disjunctive queries
Date: 2006-08-04 07:20:17
Message-ID: 29d3b0b90608040020s34144bd5i3d49a6898c3ecb7c@mail.gmail.com
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Hi,

What are the techniques used by PostgreSQL to optimize disjunctive
queries? Treat every disjunct separately? Or special optimization is
performed to save the cost?

Could any one give me some general ideas? Thanks!

--
andrew

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