code: func getLogRowData(row bigtable.Row) (data []byte, err error) {
  	items, ok := row[logColumnFamily]
  	if !ok {
  		err = storage.ErrDoesNotExist
  		return
  	}
  
  	for _, item := range items {
  		switch item.Column {
  		case logColName:
  			data = item.Value
  			return
  		}
  	}
  
  	// If no fields could be extracted, the rows does not exist.
  	err = storage.ErrDoesNotExist
  	return
  }
docs: // getLogRowData loads the []byte contents of the supplied log row.
  //
  // If the row doesn't exist, storage.ErrDoesNotExist will be returned.