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(parent: 0975b95) | patch

Define the right-hand input of AT TIME ZONE as a full a_expr instead of

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.

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