Package org.apache.druid.query.aggregation.hyperloglog

Class HyperUniqueFinalizingPostAggregator

java.lang.Object

org.apache.druid.query.aggregation.hyperloglog.HyperUniqueFinalizingPostAggregator

All Implemented Interfaces:

Cacheable, PostAggregator

public class HyperUniqueFinalizingPostAggregator
extends Object
implements PostAggregator

Constructor Summary

Constructors

Constructor	Description
HyperUniqueFinalizingPostAggregator(String name, String fieldName)

Method Summary

Modifier and Type	Method	Description
Object	compute(Map<String,Object> combinedAggregators)
HyperUniqueFinalizingPostAggregator	decorate(Map<String,AggregatorFactory> aggregators)	Allows returning an enriched post aggregator, built from contextual information available from the given map of AggregatorFactory keyed by their names.
boolean	equals(Object o)
byte[]	getCacheKey()	Get a byte array used as a cache key.
Comparator<Double>	getComparator()
Set<String>	getDependentFields()
String	getFieldName()
String	getName()
ColumnType	getType(ColumnInspector signature)	Return the output type of a row processed with this post aggregator.
int	hashCode()
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

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

getType

Constructor Detail

HyperUniqueFinalizingPostAggregator

public HyperUniqueFinalizingPostAggregator(String name,
                                           String fieldName)

Method Detail

getDependentFields

public Set<String> getDependentFields()

Specified by:

getDependentFields in interface PostAggregator

getComparator

public Comparator<Double> getComparator()

Specified by:

getComparator in interface PostAggregator

compute

public Object compute(Map<String,Object> combinedAggregators)

Specified by:

compute in interface PostAggregator

getName

public String getName()

Specified by:

getName in interface PostAggregator

getType

public ColumnType getType(ColumnInspector signature)

Description copied from interface: PostAggregator

Return the output type of a row processed with this post aggregator. Refer to the ColumnType javadocs for details on the implications of choosing a type.

Specified by:

getType in interface PostAggregator

decorate

public HyperUniqueFinalizingPostAggregator decorate(Map<String,AggregatorFactory> aggregators)

Description copied from interface: PostAggregator

Allows returning an enriched post aggregator, built from contextual information available from the given map of AggregatorFactory keyed by their names. Callers must call this method before calling PostAggregator.compute(java.util.Map<java.lang.String, java.lang.Object>) or PostAggregator.getComparator(). This is typically done in the constructor of queries which support post aggregators, via Queries.prepareAggregations(java.util.List<org.apache.druid.query.aggregation.AggregatorFactory>, java.util.List<org.apache.druid.query.aggregation.PostAggregator>).

Specified by:

decorate in interface PostAggregator

getFieldName

public String getFieldName()

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object

getCacheKey

public byte[] getCacheKey()

Description copied from interface: Cacheable

Get a byte array used as a cache key.

Specified by:

getCacheKey in interface Cacheable

Returns:

a cache key