public boolean isSet(_Fields field) {
    if (field == null) {
      throw new java.lang.IllegalArgumentException();
    }

    switch (field) {
    case FULL_TABLE_NAME:
      return isSetFullTableName();
    case WRITE_ID_HIGH_WATER_MARK:
      return isSetWriteIdHighWaterMark();
    case INVALID_WRITE_IDS:
      return isSetInvalidWriteIds();
    case MIN_OPEN_WRITE_ID:
      return isSetMinOpenWriteId();
    case ABORTED_BITS:
      return isSetAbortedBits();
    }
    throw new java.lang.IllegalStateException();
  }
Returns true if field corresponding to fieldID is set (has been assigned a value) and false otherwise
standalone-metastore/metastore-common/src/gen/thrift/gen-javabean/org/apache/hadoop/hive/metastore/api/TableValidWriteIds.java