Deparser: Add support for COALESCE and other expressions in LIMIT clause #199
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We've previously supported "c_expr" being used in a LIMIT clause, but its actually more correct to treat this as "a_expr", which is a broader set of functions, including COALESCE.
Note that the previous handling (for "c_expr") is still correct for FETCH FIRST (expr) ROWS WITH TIES, see the "select_fetch_first_value" in the Postgres grammar.
In passing fix two new warnings in the deparser caused by a recent code addition.