public Decimal128 update(Decimal128 o) {
    this.unscaledValue.update(o.unscaledValue);
    this.scale = o.scale;
    this.signum = o.signum;
    return this;
  }
Copy the value of given object.

@param o
         object to copy from
common/src/java/org/apache/hadoop/hive/common/type/Decimal128.java