io.druid.query.aggregation.cardinality

Class HyperLogLogCollectorAggregateCombiner

java.lang.Object

io.druid.query.aggregation.ObjectAggregateCombiner<HyperLogLogCollector>

io.druid.query.aggregation.cardinality.HyperLogLogCollectorAggregateCombiner

All Implemented Interfaces:

AggregateCombiner<HyperLogLogCollector>, HotLoopCallee, BaseDoubleColumnValueSelector, BaseFloatColumnValueSelector, BaseLongColumnValueSelector, BaseObjectColumnValueSelector<HyperLogLogCollector>, ColumnValueSelector<HyperLogLogCollector>, ObjectColumnSelector<HyperLogLogCollector>

public final class HyperLogLogCollectorAggregateCombiner
extends ObjectAggregateCombiner<HyperLogLogCollector>

Constructor Summary

Constructors

Constructor and Description
HyperLogLogCollectorAggregateCombiner()

Method Summary

Modifier and Type	Method and Description
Class<HyperLogLogCollector>	classOfObject()
void	fold(ColumnValueSelector selector) Folds this AggregateCombiner's state value with the value of the given selector and saves it in this AggregateCombiner's state, e.
HyperLogLogCollector	getObject()
void	reset(ColumnValueSelector selector) Resets this AggregateCombiner's state value to the value of the given selector, e.

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.druid.query.aggregation.AggregateCombiner

inspectRuntimeShape

Methods inherited from interface io.druid.segment.ObjectColumnSelector

getDouble, getFloat, getLong

Constructor Detail

HyperLogLogCollectorAggregateCombiner

public HyperLogLogCollectorAggregateCombiner()

Method Detail

reset

public void reset(ColumnValueSelector selector)

Description copied from interface: AggregateCombiner

Resets this AggregateCombiner's state value to the value of the given selector, e. g. after calling this method combiner.get*() should return the same value as selector.get*(). If the selector is an ObjectColumnSelector, the object returned from BaseObjectColumnValueSelector.getObject() must not be modified, and must not become a subject for modification during subsequent AggregateCombiner.fold(io.druid.segment.ColumnValueSelector) calls.

fold

public void fold(ColumnValueSelector selector)

Description copied from interface: AggregateCombiner

Folds this AggregateCombiner's state value with the value of the given selector and saves it in this AggregateCombiner's state, e. g. after calling combiner.fold(selector), combiner.get*() should return the value that would be the result of aggregatorFactory.combine(combiner.get*(), selector.get*()) call. Unlike AggregatorFactory.combine(java.lang.Object, java.lang.Object), if the selector is an ObjectColumnSelector, the object returned from BaseObjectColumnValueSelector.getObject() must not be modified, and must not become a subject for modification during subsequent fold() calls. Since the state of AggregateCombiner is undefined before AggregateCombiner.reset(io.druid.segment.ColumnValueSelector) is ever called on it, the effects of calling fold() are also undefined in this case.

See Also:

AggregatorFactory.combine(java.lang.Object, java.lang.Object)

classOfObject

public Class<HyperLogLogCollector> classOfObject()

getObject

@Nullable
public HyperLogLogCollector getObject()