@Override
  public String toString() {
    return "SignedInt128 (" + (this.negative ? "negative" : "positive")
        + "). mag=" + this.mag.toString();
  }
Returns the formal string representation of this value. Unlike the debug
string returned by {@link #toString()}, this method returns a string that
can be used to re-construct this object. Remember, toString() is only for
debugging.

@return string representation of this value
common/src/java/org/apache/hadoop/hive/common/type/SignedInt128.java