CREATE or REPLACE FUNCTION isIntersectCSV( p_csv1 IN VARCHAR2 , p_csv2 IN VARCHAR2)
RETURN CHAR AS
BEGIN
   IF toTableOfVarchar2(p_csv1) MULTISET INTERSECT toTableOfVarchar2(p_csv2) IS NOT EMPTY
   THEN
       RETURN 'Y';
   ELSE
       RETURN 'N';
   END IF;
END;
/