I believe that clauses.c:join_clause_p properly only allows merge and
hash joins on non-OR clauses.  It is called from
initialize_join_clause_info().

I can't get anything but a sequential scan on an OR clause, so I think
we are safe with the multi-index OR handling.

I will keep checking, though.

-- 
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Fri, 7 Aug 1998 01:10:18 -0400 (EDT)
Bruce Momjian <maillist@candle.pha.pa.us>
OR clause and joins