In this example, the UDF invocation argument data type (BYTEINT) is not the same as that of the corresponding UDF parameter data type (INTEGER) because the size of the argument data type is less than the UDF parameter data type. However, because the two data types are compatible and a BYTEINT argument can fit inside an INTEGER parameter, this is allowed.
CREATE FUNCTION test.MyUDF (a INT, b INT, c INT) RETURNS INT LANGUAGE SQL CONTAINS SQL DETERMINISTIC COLLATION INVOKER INLINE TYPE 1 RETURN a * b * c; CREATE TABLE t1 (a1 BYTEINT, b1 INT); SELECT test.MyUDF(t1.a1, t1.b1, 2) FROM t1;