public int compareTo(int[] o) {
    return compareTo(o[0], o[1], o[2], o[3]);
  }
@see #compareTo(UnsignedInt128)
@param o
         the object to be compared.
@return a negative integer, zero, or a positive integer as this object is
        less than, equal to, or greater than the specified object.
common/src/java/org/apache/hadoop/hive/common/type/UnsignedInt128.java