Method _dataSort

src/chart/bar/BarView.ts:516–545

(
        data: SeriesData<BarSeriesModel, DefaultDataVisual>,
        baseAxis: Axis2D,
        orderMapping: OrderMapping
    )

    }

    private _dataSort(
        data: SeriesData<BarSeriesModel, DefaultDataVisual>,
        baseAxis: Axis2D,
        orderMapping: OrderMapping
    ): OrdinalSortInfo {
        type SortValueInfo = {
            dataIndex: number,
            mappedValue: number,
            ordinalNumber: OrdinalNumber
        };
        const info: SortValueInfo[] = [];
        data.each(data.mapDimension(baseAxis.dim), (ordinalNumber: OrdinalNumber, dataIdx: number) => {
            let mappedValue = orderMapping(dataIdx);
            mappedValue = mappedValue == null ? NaN : mappedValue;
            info.push({
                dataIndex: dataIdx,
                mappedValue,
                ordinalNumber
            });
        });

        info.sort((a, b) => {
            // If NaN, it will be treated as min val.
            return b.mappedValue - a.mappedValue;
        });

        return {
            ordinalNumbers: map(info, item => item.ordinalNumber)
        };
    }

    private _isOrderChangedWithinSameData(
        data: SeriesData<BarSeriesModel, DefaultDataVisual>,