Обсуждение: pgsql: Marginal code cleanup in joinpath.c: factor out clause

Log Message:
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Marginal code cleanup in joinpath.c: factor out clause variable-membership
tests into a small common subroutine, and eliminate an unnecessary difference
in the order in which conditions are tested.  Per a comment from Robert Haas.

Modified Files:
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    pgsql/src/backend/optimizer/path:
        joinpath.c (r1.124 -> r1.125)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/path/joinpath.c?r1=1.124&r2=1.125)