other, ok := dst.(*Record)
	if !ok {
		other = &Record{}
	}
	if len(other.columnNames) > 0 {
		other.columnNames = other.columnNames[:0]
	}
	if len(other.csvRecord) > 0 {
		other.csvRecord = other.csvRecord[:0]
	}
	other.columnNames = append(other.columnNames, r.columnNames...)
	other.csvRecord = append(other.csvRecord, r.csvRecord...)
	return other
}