Add the ability to extract OR indexscan conditions from OR-of-AND

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 9091e8d1b233faf9994518fda7fcc171fddb53ac
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2004-01-05T05:07:36Z
Releases: 8.0.0
Add the ability to extract OR indexscan conditions from OR-of-AND
join conditions in which each OR subclause includes a constraint on
the same relation.  This implements the other useful side-effect of
conversion to CNF format, without its unpleasant side-effects.  As
per pghackers discussion of a few weeks ago.

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