public static boolean doAddSameScaleSameSign(
      FastHiveDecimal fastLeft,
      FastHiveDecimal fastRight,
      FastHiveDecimal fastResult) {
    return
        doAddSameScaleSameSign(
            /* resultSignum */ fastLeft.fastSignum,
            fastLeft.fast0, fastLeft.fast1, fastLeft.fast2,
            fastRight.fast0, fastRight.fast1, fastRight.fast2,
            fastResult);
  }
Fast decimal scale up by factor of 10.
@param fast0 word 0 of the internal representation
@param fast1 word 1
@param fast2 word 2
@param scaleUp the number of integer digits to scale up by
@param fastResult an object to reuse
@return was the operation successfule?
storage-api/src/java/org/apache/hadoop/hive/common/type/FastHiveDecimalImpl.java