org.apache.druid.query.aggregation

Interface PostAggregator

All Superinterfaces:

Cacheable

All Known Implementing Classes:

ArithmeticPostAggregator, ConstantPostAggregator, DoubleGreatestPostAggregator, DoubleLeastPostAggregator, ExpressionPostAggregator, FieldAccessPostAggregator, FinalizingFieldAccessPostAggregator, HyperUniqueFinalizingPostAggregator, JavaScriptPostAggregator, LongGreatestPostAggregator, LongLeastPostAggregator

public interface PostAggregator
extends Cacheable

Functionally similar to an Aggregator. See the Aggregator interface for more comments.

Method Summary

Modifier and Type	Method and Description
Object	compute(Map<String,Object> combinedAggregators)
PostAggregator	decorate(Map<String,AggregatorFactory> aggregators) Returns a richer post aggregator which are built from the given aggregators with their names and some accessible environmental variables such as ones in the object scope.
Comparator	getComparator()
Set<String>	getDependentFields()
String	getName()

Methods inherited from interface org.apache.druid.java.util.common.Cacheable

getCacheKey

Method Detail

getDependentFields

Set<String> getDependentFields()

getComparator

Comparator getComparator()

compute

@Nullable
Object compute(Map<String,Object> combinedAggregators)

getName

@Nullable
String getName()

decorate

PostAggregator decorate(Map<String,AggregatorFactory> aggregators)

Returns a richer post aggregator which are built from the given aggregators with their names and some accessible environmental variables such as ones in the object scope.

Parameters:

aggregators - A map of aggregator factories with their names.