add jar 'myudf.jar'
CREATE temporary FUNCTION fun1 AS 'myhive.udf.hash' ;
CREATE temporary FUNCTION fun2 AS 'myhive.udf.hash' ;

select fun1("abc") // right
 select fun2("abc",1) //error

class MyUDF extends UDF{
       public String evaluate(String s){
         return s;
    }
       public Integer evaluate(String s, int a){
         return s + String.valueOf(a)
    }

    }