public static String makeDefaultListBucketingDirName(List<String> skewedCols,
      String name) {
    String lbDirName;
    String defaultDir = FileUtils.escapePathName(name);
    StringBuilder defaultDirPath = new StringBuilder();
    for (int i = 0; i < skewedCols.size(); i++) {
      if (i > 0) {
        defaultDirPath.append(Path.SEPARATOR);
      }
      defaultDirPath.append(defaultDir);
    }
    lbDirName = defaultDirPath.toString();
    return lbDirName;
  }
default directory will have the same depth as number of skewed columns
this will make future operation easy like DML merge, concatenate merge
@param skewedCols
@param name
@return
common/src/java/org/apache/hadoop/hive/common/FileUtils.java