code: func (strings *Strings) ScanColumn(colIdx int, _ string, rd types.Reader, n int) error {
  	b := make([]byte, n)
  	_, err := io.ReadFull(rd, b)
  	if err != nil {
  		return err
  	}
  
  	*strings = append(*strings, internal.BytesToString(b))
  	return nil
  }
docs: // ScanColumn scans the columns and appends them to `strings`