Method Next

pkg/sql/sem/tree/datum.go:4648–4673

Next implements the Datum interface.

(ctx context.Context, cmpCtx CompareContext)

// Next implements the Datum interface.
func (d *DTuple) Next(ctx context.Context, cmpCtx CompareContext) (Datum, bool) {
	// Note: (a:decimal, b:int, c:int) has a next value; that's (a, b,
	// c+1). With an exception if c is MaxInt64, in which case the next
	// value is (a, b+1, min(_ *EvalContext)). However, (a:int, b:decimal) does not
	// have a next value, because decimal doesn't have one.
	//
	// In general, a tuple has a next value if and only if it ends with
	// zero or more values that are a maximum and a minimum value of the
	// same type exists, and the first element before that has a next
	// value.
	res := NewDTupleWithLen(d.typ, len(d.D))
	copy(res.D, d.D)
	for i := len(res.D) - 1; i >= 0; i-- {
		if !res.D[i].IsMax(ctx, cmpCtx) {
			nextVal, ok := res.D[i].Next(ctx, cmpCtx)
			if !ok {
				return nil, false
			}
			res.D[i] = nextVal
			break
		}
		// TODO(#12022): temporary workaround; see the interface comment.
		res.D[i] = DNull
	}
	return res, true
}

// Max implements the Datum interface.
func (d *DTuple) Max(ctx context.Context, cmpCtx CompareContext) (Datum, bool) {