promql/functions.go
func funcVector(vals []Value, args Expressions, enh *EvalNodeHelper) Vector {
	return append(enh.out,
		Sample{
			Metric: labels.Labels{},
			Point:  Point{V: vals[0].(Vector)[0].V},
		})
}
func funcVector(vals []Value, args Expressions, enh *EvalNodeHelper) Vector {
	return append(enh.out,
		Sample{
			Metric: labels.Labels{},
			Point:  Point{V: vals[0].(Vector)[0].V},
		})
}
// === Vector(s Scalar) Vector ===