Function visit_order

datafusion/expr/src/logical_plan/plan.rs:4692–4708

()

    #[test]
    fn visit_order() {
        let mut visitor = OkVisitor::default();
        let plan = test_plan();
        let res = plan.visit_with_subqueries(&mut visitor);
        assert!(res.is_ok());

        assert_debug_snapshot!(visitor.strings, @r#"
        [
            "pre_visit Projection",
            "pre_visit Filter",
            "pre_visit TableScan",
            "post_visit TableScan",
            "post_visit Filter",
            "post_visit Projection",
        ]
        "#);
    }

    #[derive(Debug, Default)]
    /// Counter than counts to zero and returns true when it gets there