@HiveDecimalVersionV1
  public int scale() {
    return bd.scale();
  }
Return a string representation of the number with the number of decimal digits as
the given scale. Please note that this is different from toString().
@param scale the number of digits after the decimal point
@return the string representation of exact number of decimal digits
storage-api/src/java/org/apache/hadoop/hive/common/type/HiveDecimalV1.java