drop function countnulls("any");
drop function countnulls("any", "any");
drop function countnulls("any", "any", "any");
drop function countnulls("any", "any", "any", "any");
drop function countnulls("any", "any", "any", "any", "any");
drop function countnulls("any", "any", "any", "any", "any", "any");
drop function countnulls("any", "any", "any", "any", "any", "any", "any");
drop function countnulls("any", "any", "any", "any", "any", "any", "any", "any");

-- 8.4 only
-- drop function countnulls(VARIADIC "any") ;