code: @Override
    public void write(DataOutput dataOutput) throws IOException {
      Text formattedValueText = new Text("");
      if (formattedValue!=null) {
  	formattedValueText = new Text(formattedValue);
      }
      Text commentText = new Text("");
      if (comment!=null) {
  	commentText = new Text(comment);
      }
      Text formulaText = new Text("");
      if (formula!=null) {
  	formulaText = new Text(formula);
      }
      Text addressText = new Text("");
      if (address!=null) {
  	addressText = new Text(address);
      }
      Text sheetNameText = new Text("");
      if (sheetName!=null) {
  	sheetNameText = new Text(sheetName);
      }
      formattedValueText.write(dataOutput);
      commentText.write(dataOutput);
      formulaText.write(dataOutput);
      addressText.write(dataOutput);
      sheetNameText.write(dataOutput);
  
  }
docs: Writable *