@Override
  public void insertFilledRow(Value[] values) throws DriverException {
    for (int i = 0; i < values.length; i++) {
      if (values[i] == null) {
        values[i] = ValueFactory.createNullValue();
      }
    }

    insertFilledRowAt(getRowCount(), values);
  }
 @Override
 public void insertEmptyRowAt(long rowIndex) throws DriverException {
   insertFilledRowAt(rowIndex, getEmptyRow());
 }