public void update64(int[] array, int offset) {
    update64(array[offset], array[offset + 1]);
  }
Updates the value of this object by reading from the given array, receiving
only 64 bits data.

@param array
         array to read values from
@param offset
         offset of the int array
common/src/java/org/apache/hadoop/hive/common/type/SignedInt128.java