code: public SimpleJob setJoin(String[] masterLabels, String masterColumn,
                               String dataColumn, String masterPath) throws IOException, URISyntaxException {
          String separator = conf.get(SEPARATOR);
          return setJoin(masterLabels, masterColumn, dataColumn, masterPath, separator, false, DEFAULT_AUTOJOIN_THRESHOLD);
      }
docs: This method is to determine automatically join the Simple and Big.
  @param masterLabels label of master data
  @param masterColumn master column
  @param dataColumn data column
  @param masterPath master data HDFS path
  @return this
  @throws URISyntaxException
  @throws IOException