| Interface | Description | 
|---|---|
| Generic1AggPooledTopNScanner | |
| Generic2AggPooledTopNScanner | |
| Historical1AggPooledTopNScanner<DimensionSelectorType extends HistoricalDimensionSelector,MetricSelectorType,BufferAggregatorType extends BufferAggregator> | |
| TopNAlgorithm<DimValSelector,Parameters extends TopNParams> | |
| TopNMetricSpec | |
| TopNMetricSpecBuilder<T> | |
| TopNQueryMetrics | 
 Specialization of  
QueryMetrics for TopNQuery. | 
| TopNQueryMetricsFactory | 
 Implementations could be injected using
 PolyBind
    .optionBinder(binder, Key.get(TopNQueryMetricsFactory.class))
    .addBinding("myCustomTopNQueryMetricsFactory")
    .to(MyCustomTopNQueryMetricsFactory.class);
 And then setting property:
 druid.query.topN.queryMetricsFactory=myCustomTopNQueryMetricsFactory 
 | 
| TopNResultBuilder | 
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