Function conflicting_metadata_dropped

datafusion/expr/src/expr.rs:4304–4309

()

        #[test]
        fn conflicting_metadata_dropped() {
            let m1 = HashMap::from([("key".into(), "a".into())]);
            let m2 = HashMap::from([("key".into(), "b".into())]);
            let result = intersect_metadata_for_union([&m1, &m2]);
            assert!(result.is_empty());
        }

        #[test]
        fn empty_metadata_branch_skipped() {