Function test_datum_map_ordering

src/repr/src/row.rs:4353–4379

()

    /// Ord/PartialOrd for DatumMap: less, equal, greater (by key then value).
    #[mz_ore::test]
    fn test_datum_map_ordering() {
        let mut row_a1 = Row::default();
        row_a1.packer().push_dict_with(|p| {
            p.push(Datum::String("a"));
            p.push(Datum::Int32(1));
        });
        let map_a1 = row_a1.unpack_first().unwrap_map();

        let mut row_a2 = Row::default();
        row_a2.packer().push_dict_with(|p| {
            p.push(Datum::String("a"));
            p.push(Datum::Int32(2));
        });
        let map_a2 = row_a2.unpack_first().unwrap_map();

        let mut row_b1 = Row::default();
        row_b1.packer().push_dict_with(|p| {
            p.push(Datum::String("b"));
            p.push(Datum::Int32(1));
        });
        let map_b1 = row_b1.unpack_first().unwrap_map();

        assert_eq!(map_a1.cmp(&map_a2), Ordering::Less);
        assert_eq!(map_a2.cmp(&map_a1), Ordering::Greater);
        assert_eq!(map_a1.cmp(&map_a1), Ordering::Equal);
        assert_eq!(map_a1.cmp(&map_b1), Ordering::Less); // "a" < "b"
    }

    /// Datum puts Null last in the enum so that nulls sort last (PostgreSQL default).
    /// This ordering is used when comparing DatumList/DatumMap (e.g. jsonb_agg tiebreaker).