Method peek

dql/parser.go:1555–1558

()

}

func (s *filterTreeStack) peek() *FilterTree {
	x.AssertTruef(!s.empty(), "Trying to peek empty stack")
	return s.a[len(s.a)-1]
}

func evalStack(opStack, valueStack *filterTreeStack) error {
	topOp, err := opStack.pop()