Method Compare

pkg/sql/sem/tree/datum.go:768–801

Compare implements the Datum interface.

(ctx *EvalContext, other Datum)

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

// Prev implements the Datum interface.
func (d *DFloat) Prev(_ *EvalContext) (Datum, bool) {