code: func getReadItem(row bigtable.Row, family, column string) *bigtable.ReadItem {
  	// Get the row for our family.
  	items, ok := row[logColumnFamily]
  	if !ok {
  		return nil
  	}
  
  	// Get the specific ReadItem for our column
  	colName := fmt.Sprintf("%s:%s", family, column)
  	for _, item := range items {
  		if item.Column == colName {
  			return &item
  		}
  	}
  	return nil
  }
docs: // getReadItem retrieves a specific RowItem from the supplied Row.