Function arrow_sum_works

nodedb/src/control/arrow_convert.rs:263–273

()

    #[test]
    fn arrow_sum_works() {
        let json = r#"[
            {"id": "d1", "data": {"price": 10.5}},
            {"id": "d2", "data": {"price": 20.0}},
            {"id": "d3", "data": {"price": 30.0}}
        ]"#;

        let batch = json_rows_to_record_batch(json).unwrap();
        let total = arrow_sum(&batch, "price").unwrap();
        assert!((total - 60.5).abs() < 0.01);
    }

    #[test]
    fn empty_input() {