public Decimal128 update(BigDecimal bigDecimal) {
     return update(bigDecimal.unscaledValue(), (short) bigDecimal.scale());
   }
Updates the value of this object with the given {@link BigDecimal}. 
@param bigDecimal
   {@link java.math.BigDecimal}
common/src/java/org/apache/hadoop/hive/common/type/Decimal128.java