org.apache.flink.api.java.operators

Class ReduceOperator<IN>

java.lang.Object

org.apache.flink.api.java.DataSet<OUT>

org.apache.flink.api.java.operators.Operator<OUT,O>

org.apache.flink.api.java.operators.SingleInputOperator<IN,OUT,O>

org.apache.flink.api.java.operators.SingleInputUdfOperator<IN,IN,ReduceOperator<IN>>

org.apache.flink.api.java.operators.ReduceOperator<IN>

Type Parameters:

IN - The type of the data set reduced by the operator.

All Implemented Interfaces:

UdfOperator<ReduceOperator<IN>>

public class ReduceOperator<IN>
extends SingleInputUdfOperator<IN,IN,ReduceOperator<IN>>

This operator represents the application of a "reduce" function on a data set, and the result data set produced by the function.

See Also:

ReduceFunction

Constructor Summary

Constructors

Constructor and Description
ReduceOperator(DataSet<IN> input, ReduceFunction<IN> function) This is the case for a reduce-all case (in contrast to the reduce-per-group case).
ReduceOperator(Grouping<IN> input, ReduceFunction<IN> function)

Method Summary

Methods

Modifier and Type	Method and Description
protected SingleInputOperator<?,IN,?>	translateToDataFlow(Operator<IN> input) Translates this operation to a data flow operator of the common data flow API.

Methods inherited from class org.apache.flink.api.java.operators.SingleInputUdfOperator

extractSemanticAnnotationsFromUdf, getBroadcastSets, getParameters, getSematicProperties, setSemanticProperties, withBroadcastSet, withConstantSet, withParameters

Methods inherited from class org.apache.flink.api.java.operators.SingleInputOperator

getInput, getInputType

Methods inherited from class org.apache.flink.api.java.operators.Operator

getName, getParallelism, getResultType, name, setParallelism

Methods inherited from class org.apache.flink.api.java.DataSet

aggregate, checkSameExecutionContext, coGroup, cross, crossWithHuge, crossWithTiny, distinct, distinct, distinct, filter, flatMap, getExecutionEnvironment, getType, groupBy, groupBy, iterate, iterateDelta, join, joinWithHuge, joinWithTiny, map, max, min, output, print, printToErr, project, reduce, reduceGroup, runOperation, sum, union, write, write, writeAsCsv, writeAsCsv, writeAsCsv, writeAsText, writeAsText

Methods inherited from class java.lang.Object

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

Constructor Detail

ReduceOperator

public ReduceOperator(DataSet<IN> input,
              ReduceFunction<IN> function)

This is the case for a reduce-all case (in contrast to the reduce-per-group case).

Parameters:

input -

function -

ReduceOperator

public ReduceOperator(Grouping<IN> input,
              ReduceFunction<IN> function)

Method Detail

translateToDataFlow

protected SingleInputOperator<?,IN,?> translateToDataFlow(Operator<IN> input)

Description copied from class: SingleInputOperator

Translates this operation to a data flow operator of the common data flow API.

Specified by:

translateToDataFlow in class SingleInputOperator<IN,IN,ReduceOperator<IN>>

Parameters:

input - The data flow operator that produces this operation's input data.

Returns:

The translated data flow operator.