Method Compare

pkg/sql/sem/tree/datum.go:853–890

Compare implements the Datum interface.

(ctx context.Context, cmpCtx CompareContext, other Datum)

// Compare implements the Datum interface.
func (d *DFloat) Compare(ctx context.Context, cmpCtx CompareContext, other Datum) (int, error) {
	if other == DNull {
		// NULL is less than any non-NULL value.
		return 1, nil
	}
	var v DFloat
	switch t := cmpCtx.UnwrapDatum(ctx, other).(type) {
	case *DFloat:
		v = *t
	case *DInt:
		v = DFloat(MustBeDInt(t))
	case *DDecimal:
		res, err := t.Compare(ctx, cmpCtx, d)
		if err != nil {
			return 0, err
		}
		return -res, nil
	default:
		return 0, makeUnsupportedComparisonMessage(d, other)
	}
	if *d < v {
		return -1, nil
	}
	if *d > v {
		return 1, nil
	}
	// NaN sorts before non-NaN (#10109).
	if *d == v {
		return 0, nil
	}
	if math.IsNaN(float64(*d)) {
		if math.IsNaN(float64(v)) {
			return 0, nil
		}
		return -1, nil
	}
	return 1, nil
}

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