Log Message:
-----------
Apply my original fix for Taiki Yamaguchi's bug report about DISTINCT MAX().
Add some regression tests for plausible failures in this area.

Modified Files:
--------------
pgsql/src/backend/optimizer/path:
equivclass.c (r1.9 -> r1.10)
(http://anoncvs.postgresql.org/cvsweb...r1=1.9&r2=1.10)
pgsql/src/backend/optimizer/plan:
planagg.c (r1.36 -> r1.37)
(http://anoncvs.postgresql.org/cvsweb...1=1.36&r2=1.37)
pgsql/src/include/optimizer:
paths.h (r1.103 -> r1.104)
(http://anoncvs.postgresql.org/cvsweb...1.103&r2=1.104)
pgsql/src/test/regress/expected:
aggregates.out (r1.16 -> r1.17)
(http://anoncvs.postgresql.org/cvsweb...1=1.16&r2=1.17)
pgsql/src/test/regress/sql:
aggregates.sql (r1.13 -> r1.14)
(http://anoncvs.postgresql.org/cvsweb...1=1.13&r2=1.14)

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