Function all_branches_empty_metadata

datafusion/expr/src/expr.rs:4328–4333

()

        #[test]
        fn all_branches_empty_metadata() {
            let m1: HashMap<String, String> = HashMap::new();
            let m2: HashMap<String, String> = HashMap::new();
            let result = intersect_metadata_for_union([&m1, &m2]);
            assert!(result.is_empty());
        }

        #[test]
        fn mixed_empty_and_conflicting() {