public Binary getBlob(int columnIndex) throws StatementExecutionException {
      return ioTDBRpcDataSet.getBinary(columnIndex);
    }
Iterate ResultSet using this method isn't very efficient, because it will use RowRecord to
represent a row which contains much object creation and converting overhead If you just want to
get each value of each column row by row, you can use SessionDataSet.iterator() to get
DataIterator, and use DataIterator.getXXX() function to get current row's specified column
value.

@return One complete row saved in RowRecord
iotdb-client/isession/src/main/java/org/apache/iotdb/isession/SessionDataSet.java