Method Compare

pkg/sql/sem/tree/datum.go:709–745

Compare implements the Datum interface.

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

// Compare implements the Datum interface.
func (d *DInt) Compare(ctx context.Context, cmpCtx CompareContext, other Datum) (int, error) {
	if other == DNull {
		// NULL is less than any non-NULL value.
		return 1, nil
	}
	thisInt := *d
	var v DInt
	switch t := cmpCtx.UnwrapDatum(ctx, other).(type) {
	case *DInt:
		v = *t
	case *DFloat, *DDecimal:
		res, err := t.Compare(ctx, cmpCtx, d)
		if err != nil {
			return 0, err
		}
		return -res, nil
	case *DOid:
		// OIDs are always unsigned 32-bit integers. Some languages, like Java,
		// compare OIDs to signed 32-bit integers, so we implement the comparison
		// by converting to a uint32 first. This matches Postgres behavior.
		o, err := IntToOid(thisInt)
		if err != nil {
			return 0, err
		}
		thisInt = DInt(o)
		v = DInt(t.Oid)
	default:
		return 0, makeUnsupportedComparisonMessage(d, other)
	}
	if thisInt < v {
		return -1, nil
	}
	if thisInt > v {
		return 1, nil
	}
	return 0, nil
}

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