IndexBuildHeapScan and RIDs order

From: Leonardo F <m_lists(at)yahoo(dot)it>
To: pgsql-hackers(at)postgresql(dot)org
Subject: IndexBuildHeapScan and RIDs order
Date: 2010-02-08 16:28:38
Message-ID: 911859.24290.qm@web29012.mail.ird.yahoo.com
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Hi,

I was looking at the code for bitmap index:

http://archives.postgresql.org/pgsql-hackers/2008-10/msg01691.php

and I couldn't understand why during "bmbuild" (the ambuild call for
bitmap indexes) the code checks for not-ordered ItemPointerData(s).

In which cases the ItemPointerData(s) given by IndexBuildHeapScan

are not in order (when allow_sync=false)?

Leonardo

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