func (r *Record) Reset() {
	if len(r.columnNames) > 0 {
		r.columnNames = r.columnNames[:0]
	}
	if len(r.csvRecord) > 0 {
		r.csvRecord = r.csvRecord[:0]
	}
	for k := range r.nameIndexMap {
		delete(r.nameIndexMap, k)
	}
}

// Clone the record.
func (r *Record) Clone(dst sql.Record) sql.Record {
	other, ok := dst.(*Record)
	if !ok {
		other = &Record{}
	}
	if len(other.columnNames) > 0 {

		}
	}

	// If no index map, add that.
	if r.nameIndexMap == nil {
		r.nameIndexMap = make(map[string]int64)
		for i := range r.columnNames {
			r.nameIndexMap[r.columnNames[i]] = int64(i)
		}
	}
	dstRec, ok := dst.(*Record)
	if !ok {
		dstRec = &Record{}
	}
	dstRec.columnNames = r.columnNames
	dstRec.csvRecord = csvRecord
	dstRec.nameIndexMap = r.nameIndexMap

	return dstRec, nil
}