Method getApproximateExtent

src/data/SeriesData.ts:681–686

* Optimize for the scenario that data is filtered by a given extent. * Consider that if data amount is more than hundreds of thousand, * extent calculation will cost more than 10ms and the cache will * be erased because of the filtering.

(
        dim: SeriesDimensionLoose,
        filter: DataSanitizationFilter | NullUndefined
    )

     * be erased because of the filtering.
     */
    getApproximateExtent(
        dim: SeriesDimensionLoose,
        filter: DataSanitizationFilter | NullUndefined
    ): [number, number] {
        return this._approximateExtent[dim] || this._store.getDataExtent(this._getStoreDimIndex(dim), filter);
    }

    /**
     * NOTICE: `_approximateExtent` does not support filter. Callers must ensure the input extent