Log Message:
-----------
Fix column privilege checking for cases where parent and child have different
attribute numbering.  Also, a parent whole-row reference should not require
select privilege on child columns that aren't inherited from the parent.
Problem diagnosed by KaiGai Kohei, though this isn't exactly his patch.

Modified Files:
--------------
    pgsql/src/backend/optimizer/prep:
        prepunion.c (r1.166 -> r1.167)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/prep/prepunion.c?r1=1.166&r2=1.167)
    pgsql/src/test/regress/expected:
        privileges.out (r1.45 -> r1.46)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/privileges.out?r1=1.45&r2=1.46)
    pgsql/src/test/regress/sql:
        privileges.sql (r1.24 -> r1.25)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/privileges.sql?r1=1.24&r2=1.25)

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