Function multiple_fields

nodedb-query/src/msgpack_scan/group_key.rs:134–138

()

    #[test]
    fn multiple_fields() {
        let doc = encode(&json!({"city": "ny", "year": 2024}));
        let key = build_group_key(&doc, &["city".into(), "year".into()]);
        assert_eq!(key, r#"["ny",2024]"#);
    }

    #[test]
    fn missing_field_is_null() {