Aggregate a feature.
Aggregate a feature. May be called anytime after init
simple feature
number of entries aggregated
Dispose of any resources used by the scan.
Dispose of any resources used by the scan. If the result is re-used, init
will be called
again before anything else
Encode current aggregation and reset the result.
Encode current aggregation and reset the result. May be called anytime after init
Initialize the result for a scan
Aggregation result