Planner question

From: Tom Raney <raneyt(at)cecs(dot)pdx(dot)edu>
To: Postgres Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Planner question
Date: 2008-09-05 18:21:25
Message-ID: 48C178A5.1070806@cecs.pdx.edu
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Why does the planner consider both input variations of each symmetric merge join? The README says "there is not a lot of difference" between the two options. When are there any differences?

-Tom Raney

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