Function topk_with_param

nodedb/src/control/promql/parser.rs:513–520

()

    #[test]
    fn topk_with_param() {
        if let Expr::Aggregate { op, param, .. } = p("topk(5, requests)") {
            assert_eq!(op, AggOp::Topk);
            assert!(param.is_some());
        } else {
            panic!("expected Aggregate");
        }
    }

    #[test]
    fn nested_functions() {