OR clause status report

I have succeeded in making OR clauses use indexes.  I have not dealt
with some of the more complex issues like x=3 or y=5 as Vadim mentioned,
but at least it works.

    test=> select * from test where x=102532 or x=102533;
         x
    ------
    102532
    102533
    (2 rows)

    test=> explain select * from test where x=102532 or x=102533;
    NOTICE:  QUERY PLAN:

    Index Scan using i_test on test  (cost=4.10 size=1 width=4)

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