Function frame

nodedb-query/src/window/value_agg.rs:458–464

(mode: &str, start: FrameBound, end: FrameBound)

    }

    fn frame(mode: &str, start: FrameBound, end: FrameBound) -> WindowFrame {
        WindowFrame {
            mode: mode.into(),
            start,
            end,
        }
    }

    #[test]
    fn running_sum_is_cumulative() {