code: public void write(RowOutputInterface out) {
  
          try {
              writeNodes(out);
  
              if (hasDataChanged) {
                  out.writeData(rowData, tTable.colTypes);
                  out.writeEnd();
  
                  hasDataChanged = false;
              }
          } catch (IOException e) {}
      }
docs: Used exclusively by Cache to save the row to disk. New implementation in
  1.7.2 writes out only the Node data if the table row data has not
  changed. This situation accounts for the majority of invocations as for
  each row deleted or inserted, the Nodes for several other rows will
  change.