io.druid.query.topn

Class Generic1AggPooledTopNScannerPrototype

java.lang.Object

io.druid.query.topn.Generic1AggPooledTopNScannerPrototype

All Implemented Interfaces:

Generic1AggPooledTopNScanner

public final class Generic1AggPooledTopNScannerPrototype
extends Object
implements Generic1AggPooledTopNScanner

Constructor Summary

Constructors

Constructor and Description
Generic1AggPooledTopNScannerPrototype()

Method Summary

Modifier and Type	Method and Description
long	scanAndAggregate(DimensionSelector dimensionSelector, BufferAggregator aggregator, int aggregatorSize, Cursor cursor, int[] positions, ByteBuffer resultsBuffer)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Generic1AggPooledTopNScannerPrototype

public Generic1AggPooledTopNScannerPrototype()

Method Detail

scanAndAggregate

public long scanAndAggregate(DimensionSelector dimensionSelector,
                             BufferAggregator aggregator,
                             int aggregatorSize,
                             Cursor cursor,
                             int[] positions,
                             ByteBuffer resultsBuffer)

Specified by:

scanAndAggregate in interface Generic1AggPooledTopNScanner

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