@Override
  public void deleteData(List<String> paths, long endTime)
      throws IoTDBConnectionException, StatementExecutionException {
    deleteData(paths, Long.MIN_VALUE, endTime);
  }
delete data <= time in multiple timeseries

@param paths data in which time series to delete
@param endTime data with time stamp less than or equal to time will be deleted
iotdb-client/session/src/main/java/org/apache/iotdb/session/Session.java