code: func (ints *Ints) ScanColumn(colIdx int, colName string, rd types.Reader, n int) error {
  	num, err := types.ScanInt64(rd, n)
  	if err != nil {
  		return err
  	}
  
  	*ints = append(*ints, num)
  	return nil
  }
docs: // ScanColumn scans the columns and appends them to `ints`