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    Function Name Description
    IS [NOT] DISTINCT FROM Compares two expressions to determine whether they have the same or different values. NULLs are considered as comparable values.
    ISFALSE Tests whether the input expression is false. If it is, returns a value of true.
    IS [NOT] NULL Determines if an expression is NULL or not NULL. Alias for the function ISNULL/ISNOTNULL.
    ISNUMERIC Determines whether an expression is a valid numeric type (DECIMAL, DOUBLE, INT, BIGINT, VARBINARY).
    ISTRUE Returns TRUE if the input expression evaluates to TRUE.
    IS_MEMBER Returns whether the current user is a member of the specified role.