Syntax options:

    VARIANT | NOT VARIANT

    These clauses are synonyms for the DETERMINISTIC and NOT
    DETERMINISTIC clauses for conformance to the SQL/PSM standard.
    The DETERMINISTIC clause indicates that the same inputs to the
    function will generate the same output. It is the same as the NOT
    VARIANT clause. The NOT DETERMINISTIC clause indicates that the
    output of the function does not depend on the inputs. It is the
    same as the VARIANT clause.