Log Message:
-----------
Add some defenses against functions declared to return set that don't
actually follow the protocol; per example from Kris Jurka.

Modified Files:
--------------
    pgsql/src/backend/executor:
        execQual.c (r1.177 -> r1.178)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/execQual.c.diff?r1=1.177&r2=1.178)

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