Method ContainsNull

pkg/sql/sem/tree/datum.go:3212–3224

ContainsNull returns true if the tuple contains NULL, possibly nested inside other tuples. For example, all the following tuples contain NULL: (1, 2, NULL) ((1, 1), (2, NULL)) (((1, 1), (2, 2)), ((3, 3), (4, NULL)))

()

//  ((1, 1), (2, NULL))
//  (((1, 1), (2, 2)), ((3, 3), (4, NULL)))
func (d *DTuple) ContainsNull() bool {
	for _, r := range d.D {
		if r == DNull {
			return true
		}
		if t, ok := r.(*DTuple); ok {
			if t.ContainsNull() {
				return true
			}
		}
	}
	return false
}

type dNull struct{}