Function empty_metadata_first_branch_skipped

datafusion/expr/src/expr.rs:4320–4325

()

        #[test]
        fn empty_metadata_first_branch_skipped() {
            let m1 = HashMap::new();
            let m2 = HashMap::from([("key".into(), "val".into())]);
            let result = intersect_metadata_for_union([&m1, &m2]);
            assert_eq!(result, HashMap::from([("key".into(), "val".into())]));
        }

        #[test]
        fn all_branches_empty_metadata() {