func (r Record) Columns() []string {
	cols := []string{}
	for k := range r {
		cols = append(cols, k)
	}
	sort.Strings(cols)

	return cols
}
func (r Record) Columns() []string {
	cols := []string{}
	for k := range r {
		cols = append(cols, k)
	}
	sort.Strings(cols)

	return cols
}
func ( r Record ) Columns ( ) [ ] string { cols := [ ] string { } for k := range r { cols = append ( cols , k ) } sort . Strings ( cols ) return cols }
// Columns returns the list of the record columns.
Columns returns the list of the record columns .