Log Message:
-----------
Define the right-hand input of AT TIME ZONE as a full a_expr instead of
c_expr. Perhaps the restriction was once needed to avoid bison errors,
but it seems to work just fine now --- and even generates a slightly
smaller state machine. This change allows examples like
SELECT '13:45'::timetz AT TIME ZONE '-07:00'::interval;
to work without parentheses around the right-hand input.
Modified Files:
--------------
pgsql/src/backend/parser:
gram.y (r2.487 -> r2.488)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/gram.y.diff?r1=2.487&r2=2.488)
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