Package org.apache.druid.query.aggregation.cardinality

Class CardinalityAggregator

java.lang.Object

org.apache.druid.query.aggregation.cardinality.CardinalityAggregator

All Implemented Interfaces:

Closeable, AutoCloseable, Aggregator

public class CardinalityAggregator
extends Object
implements Aggregator

Field Summary

Fields

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

Method Summary

Modifier and Type	Method	Description
void	aggregate()	Performs aggregation.
void	close()
Object	get()
double	getDouble()	The default implementation casts Aggregator.getFloat() to double.
float	getFloat()
long	getLong()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.druid.query.aggregation.Aggregator

aggregateWithSize, isNull

Field Detail

HASH_FUNCTION

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

Method Detail

aggregate

public void aggregate()

Description copied from interface: Aggregator

Performs aggregation.

Specified by:

aggregate 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

getDouble

public double getDouble()

Description copied from interface: Aggregator

The default implementation casts Aggregator.getFloat() to double. This default method is added to enable smooth backward compatibility, please re-implement it if your aggregators work with numeric double columns.

Specified by:

getDouble in interface Aggregator

close

public void close()

Specified by:

close in interface Aggregator

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable