Package org.apache.flink.streaming.api.functions.aggregation

Class ComparableAggregator<T>

java.lang.Object

org.apache.flink.streaming.api.functions.aggregation.AggregationFunction<T>

org.apache.flink.streaming.api.functions.aggregation.ComparableAggregator<T>

All Implemented Interfaces:

Serializable, org.apache.flink.api.common.functions.Function, org.apache.flink.api.common.functions.ReduceFunction<T>

@Internal
public class ComparableAggregator<T>
extends AggregationFunction<T>

An AggregationFunction that computes values based on comparisons of Comparables.

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.flink.streaming.api.functions.aggregation.AggregationFunction

AggregationFunction.AggregationType

Constructor Summary

Constructors

Constructor	Description
ComparableAggregator(int positionToAggregate, org.apache.flink.api.common.typeinfo.TypeInformation<T> typeInfo, AggregationFunction.AggregationType aggregationType, boolean first, org.apache.flink.api.common.ExecutionConfig config)
ComparableAggregator(int positionToAggregate, org.apache.flink.api.common.typeinfo.TypeInformation<T> typeInfo, AggregationFunction.AggregationType aggregationType, org.apache.flink.api.common.ExecutionConfig config)
ComparableAggregator(String field, org.apache.flink.api.common.typeinfo.TypeInformation<T> typeInfo, AggregationFunction.AggregationType aggregationType, boolean first, org.apache.flink.api.common.ExecutionConfig config)

Method Summary

Modifier and Type	Method	Description
T	reduce(T value1, T value2)

Methods inherited from class java.lang.Object

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

Constructor Details

ComparableAggregator

public ComparableAggregator(int positionToAggregate,
 org.apache.flink.api.common.typeinfo.TypeInformation<T> typeInfo,
 AggregationFunction.AggregationType aggregationType,
 org.apache.flink.api.common.ExecutionConfig config)

ComparableAggregator

public ComparableAggregator(int positionToAggregate,
 org.apache.flink.api.common.typeinfo.TypeInformation<T> typeInfo,
 AggregationFunction.AggregationType aggregationType,
 boolean first,
 org.apache.flink.api.common.ExecutionConfig config)

ComparableAggregator

public ComparableAggregator(String field,
 org.apache.flink.api.common.typeinfo.TypeInformation<T> typeInfo,
 AggregationFunction.AggregationType aggregationType,
 boolean first,
 org.apache.flink.api.common.ExecutionConfig config)

Method Details

reduce

public T reduce(T value1,
 T value2)
         throws Exception

Throws:

Exception