Log Message:
-----------
Fix oversight in MIN/MAX optimization: must not return NULL entries
from index, since the aggregates ignore NULLs.

Modified Files:
--------------
    pgsql/src/backend/optimizer/plan:
        createplan.c (r1.178 -> r1.179)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/plan/createplan.c.diff?r1=1.178&r2=1.179)
        planagg.c (r1.2 -> r1.3)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/plan/planagg.c.diff?r1=1.2&r2=1.3)
    pgsql/src/include/optimizer:
        planmain.h (r1.81 -> r1.82)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/optimizer/planmain.h.diff?r1=1.81&r2=1.82)

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