public RowRecord next() throws IoTDBConnectionException, StatementExecutionException {
    return sessionDataSet.next();
  }
If there is an Exception, and you do not want to use the resultset anymore, you have to release
the resultset manually by calling closeResultSet

@return
@throws IoTDBConnectionException
@throws StatementExecutionException
iotdb-client/isession/src/main/java/org/apache/iotdb/isession/pool/SessionDataSetWrapper.java