code: protected void setBigJoin(String[] masterLabels, String masterColumn,
                                String dataColumn, String masterSeparator, List<String> masterData) {
          this.conf.setInt(SimpleJob.READER_TYPE, SimpleJob.SINGLE_COLUMN_JOIN_READER);
          this.conf.setStrings(SimpleJob.MASTER_LABELS, masterLabels);
          this.conf.set(SimpleJob.JOIN_MASTER_COLUMN, masterColumn);
          this.conf.set(SimpleJob.JOIN_DATA_COLUMN, dataColumn);
          this.masterSeparator = masterSeparator;
          this.masterData = masterData;
          this.bigJoin = true;
      }
docs: to join the data that does not fit into memory.
  @param masterLabels label of master data
  @param masterColumn master column
  @param dataColumn data column
  @param masterSeparator separator
  @param masterData master data