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Recheck condition

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To: pgsql-general@xxxxxxxxxxxxxx
Subject: Recheck condition
From: "Josh Harrison" <joshques@xxxxxxxxx>
Date: Wed, 28 Nov 2007 13:18:56 -0500

Hi,
Sorry if my question is silly.
When I use explain analyze command I come across 'recheck condition' in some places.
I googled for this but didn't get any solid answers.

What is recheck condition and when does the query planner choose this?
Thanks
josh

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