Method Compare

runtime/sam/expr/sort.go:132–144

Compare returns an interger comparing two values according to the receiver's configuration. The result will be 0 if a==b, -1 if a < b, and +1 if a > b.

(a, b super.Value)

// Compare returns an interger comparing two values according to the receiver's
// configuration.  The result will be 0 if a==b, -1 if a < b, and +1 if a > b.
func (c *Comparator) Compare(a, b super.Value) int {
	for _, k := range c.exprs {
		aval := k.Eval(a)
		bval := k.Eval(b)
		if k.Order == order.Desc {
			aval, bval = bval, aval
		}
		if v := compareValues(aval, bval, k.nullsMax()); v != 0 {
			return v
		}
	}
	return 0
}

func compareValues(a, b super.Value, nullsMax bool) int {
	a = a.Under()