Package org.apache.druid.query.topn

Interface Historical1AggPooledTopNScanner<DimensionSelectorType extends HistoricalDimensionSelector,MetricSelectorType,BufferAggregatorType extends BufferAggregator>

All Known Implementing Classes:

Historical1SimpleDoubleAggPooledTopNScannerPrototype, HistoricalSingleValueDimSelector1SimpleDoubleAggPooledTopNScannerPrototype

public interface Historical1AggPooledTopNScanner<DimensionSelectorType extends HistoricalDimensionSelector,MetricSelectorType,BufferAggregatorType extends BufferAggregator>

Method Summary

Modifier and Type	Method	Description
long	scanAndAggregate(DimensionSelectorType dimensionSelector, MetricSelectorType metricSelector, BufferAggregatorType aggregator, int aggregatorSize, HistoricalCursor cursor, int[] positions, ByteBuffer resultsBuffer)

Method Details

scanAndAggregate

long scanAndAggregate(DimensionSelectorType dimensionSelector,
 MetricSelectorType metricSelector,
 BufferAggregatorType aggregator,
 int aggregatorSize,
 HistoricalCursor cursor,
 int[] positions,
 ByteBuffer resultsBuffer)

Parameters:

aggregatorSize - number of bytes required by aggregator for a single aggregation

positions - a cache for positions in resultsBuffer, where specific (indexed) dimension values are aggregated

Returns:

number of scanned rows, i. e. number of steps made with the given cursor