@HiveDecimalVersionV1
  public HiveDecimal scaleByPowerOfTen(int power) {
    if (power == 0 || fastSignum() == 0) {
      // No change for multiply by 10^0 or value 0.
      return this;
    }
    HiveDecimal result = new HiveDecimal();
    if (!fastScaleByPowerOfTen(
        power,
        result)) {
      return null;
    }
    return result;
  }
Multiplies a decimal by a power of 10.
<p>
The decimal 19350 scale 0 will return 193.5 scale 1 when power is -2 (negative).
<p>
The decimal 1.000923 scale 6 will return 10009.23 scale 2 when power is 4 (positive).
<p>
@param power
@return Returns a HiveDecimal whose value is value * 10^power.
storage-api/src/java/org/apache/hadoop/hive/common/type/HiveDecimal.java