code: public boolean isSet(_Fields field) {
      if (field == null) {
        throw new IllegalArgumentException();
      }
  
      switch (field) {
      case STATUS:
        return isSetStatus();
      case METADATA_IN_JSON:
        return isSetMetadataInJson();
      case COLUMNS_LIST:
        return isSetColumnsList();
      case DATA_TYPE:
        return isSetDataType();
      case SHOW_TIMESERIES_LIST:
        return isSetShowTimeseriesList();
      case SHOW_STORAGE_GROUPS:
        return isSetShowStorageGroups();
      }
      throw new IllegalStateException();
    }
docs: Returns true if field corresponding to fieldID is set (has been assigned a value) and false otherwise