@Override
  public void createMultiTimeseries(
      List<String> paths,
      List<TSDataType> dataTypes,
      List<TSEncoding> encodings,
      List<CompressionType> compressors,
      List<Map<String, String>> propsList,
      List<Map<String, String>> tagsList,
      List<Map<String, String>> attributesList,
      List<String> measurementAliasList)
      throws IoTDBConnectionException, StatementExecutionException {
    TSCreateMultiTimeseriesReq request =
        genTSCreateMultiTimeseriesReq(
            paths,
            dataTypes,
            encodings,
            compressors,
            propsList,
            tagsList,
            attributesList,
            measurementAliasList);
    defaultSessionConnection.createMultiTimeseries(request);
  }
Only changes the member variable of the Session object without sending it to server.
iotdb-client/session/src/main/java/org/apache/iotdb/session/Session.java