// converted based on the query.
func (r *Record) Get(name string) (*sql.Value, error) {
	index, found := r.nameIndexMap[name]
	if !found {
		// Check if index.
		if after, ok := strings.CutPrefix(name, "_"); ok {
			idx, err := strconv.Atoi(after)
			if err != nil {
				return nil, fmt.Errorf("column %v not found", name)
			}
			// The position count starts at 1.
			idx--