io.druid.query.aggregation.cardinality

Class CardinalityAggregator

java.lang.Object

io.druid.query.aggregation.cardinality.CardinalityAggregator

All Implemented Interfaces:

Aggregator, Closeable, AutoCloseable

public class CardinalityAggregator
extends Object
implements Aggregator

Field Summary

Fields

Modifier and Type	Field and Description
static com.google.common.hash.HashFunction	hashFn

Constructor Summary

Constructors

Constructor and Description
CardinalityAggregator(String name, List<ColumnSelectorPlus<CardinalityAggregatorColumnSelectorStrategy>> selectorPlusList, boolean byRow)

Method Summary

Modifier and Type	Method and Description
void	aggregate()
Aggregator	clone()
void	close()
Object	get()
float	getFloat()
long	getLong()
protected static void	hashRow(List<ColumnSelectorPlus<CardinalityAggregatorColumnSelectorStrategy>> selectorPlusList, HyperLogLogCollector collector)
protected static void	hashValues(List<ColumnSelectorPlus<CardinalityAggregatorColumnSelectorStrategy>> selectorPlusList, HyperLogLogCollector collector)
void	reset()

Methods inherited from class java.lang.Object

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

Field Detail

hashFn

public static final com.google.common.hash.HashFunction hashFn

Constructor Detail

CardinalityAggregator

public CardinalityAggregator(String name,
                             List<ColumnSelectorPlus<CardinalityAggregatorColumnSelectorStrategy>> selectorPlusList,
                             boolean byRow)

Method Detail

hashRow

protected static void hashRow(List<ColumnSelectorPlus<CardinalityAggregatorColumnSelectorStrategy>> selectorPlusList,
                              HyperLogLogCollector collector)

hashValues

protected static void hashValues(List<ColumnSelectorPlus<CardinalityAggregatorColumnSelectorStrategy>> selectorPlusList,
                                 HyperLogLogCollector collector)

aggregate

public void aggregate()

Specified by:

aggregate in interface Aggregator

reset

public void reset()

Specified by:

reset in interface Aggregator

get

public Object get()

Specified by:

get in interface Aggregator

getFloat

public float getFloat()

Specified by:

getFloat in interface Aggregator

getLong

public long getLong()

Specified by:

getLong in interface Aggregator

clone

public Aggregator clone()

Overrides:

clone in class Object

close

public void close()

Specified by:

close in interface Aggregator

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable