Package org.apache.wayang.basic.operators

Class GlobalReduceOperator<Type>

java.lang.Object

org.apache.wayang.core.plan.wayangplan.OperatorBase

org.apache.wayang.core.plan.wayangplan.UnaryToUnaryOperator<Type,Type>

org.apache.wayang.basic.operators.GlobalReduceOperator<Type>

All Implemented Interfaces:

Serializable, ActualOperator, ElementaryOperator, Operator

Direct Known Subclasses:

FlinkGlobalReduceOperator, JavaGlobalReduceOperator, SparkGlobalReduceOperator

public class GlobalReduceOperator<Type>
extends UnaryToUnaryOperator<Type,Type>

This operator groups the elements of a data set and aggregates the groups.

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.wayang.core.plan.wayangplan.OperatorBase

OperatorBase.GsonSerializer

Field Summary

Fields

Modifier and Type	Field	Description
protected final ReduceDescriptor<Type>	reduceDescriptor

Fields inherited from class org.apache.wayang.core.plan.wayangplan.OperatorBase

inputSlots, outputSlots, STANDARD_OPERATOR_ARGS

Fields inherited from interface org.apache.wayang.core.plan.wayangplan.Operator

FIRST_EPOCH

Constructor Summary

Constructors

Constructor	Description
GlobalReduceOperator(GlobalReduceOperator<Type> that)	Copies an instance (exclusive of broadcasts).
GlobalReduceOperator(FunctionDescriptor.SerializableBinaryOperator<Type> reduceFunction, Class<Type> typeClass)	Creates a new instance.
GlobalReduceOperator(ReduceDescriptor<Type> reduceDescriptor)	Creates a new instance.
GlobalReduceOperator(ReduceDescriptor<Type> reduceDescriptor, DataSetType<Type> type)	Creates a new instance.

Method Summary

Modifier and Type	Method	Description
Optional<CardinalityEstimator>	createCardinalityEstimator(int outputIndex, Configuration configuration)	Provide a CardinalityEstimator for the OutputSlot at outputIndex.
ReduceDescriptor<Type>	getReduceDescriptor()
DataSetType<Type>	getType()

Methods inherited from class org.apache.wayang.core.plan.wayangplan.UnaryToUnaryOperator

getInput, getInputType, getOutput, getOutputType

Methods inherited from class org.apache.wayang.core.plan.wayangplan.OperatorBase

accept, addBroadcastInput, addTargetPlatform, at, collectMappedInputSlots, collectMappedOutputSlots, copy, createCopy, getAllInputs, getAllOutputs, getCardinalityEstimator, getContainer, getEpoch, getName, getOriginal, getSimpleClassName, getTargetPlatforms, isAuxiliary, isSupportingBroadcastInputs, propagateInputCardinality, propagateOutputCardinality, setAuxiliary, setCardinalityEstimator, setContainer, setEpoch, setName, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.wayang.core.plan.wayangplan.ActualOperator

accept

Methods inherited from interface org.apache.wayang.core.plan.wayangplan.ElementaryOperator

getCardinalityEstimator, isAuxiliary, setAuxiliary, setCardinalityEstimator

Methods inherited from interface org.apache.wayang.core.plan.wayangplan.Operator

addBroadcastInput, addTargetPlatform, broadcastTo, broadcastTo, collectMappedInputSlots, collectMappedOutputSlots, connectTo, connectTo, getAllInputs, getAllOutputs, getCardinalityPusher, getContainer, getEffectiveOccupant, getEffectiveOccupant, getEpoch, getEstimationContextProperties, getForwards, getInnermostLoop, getInput, getInput, getLoopStack, getName, getNumBroadcastInputs, getNumInputs, getNumOutputs, getNumRegularInputs, getOuterInputSlot, getOutermostInputSlot, getOutermostOutputSlots, getOutput, getOutput, getParent, getTargetPlatforms, isAlternative, isConversion, isElementary, isExecutionOperator, isFeedbackInput, isFeedforwardOutput, isLoopHead, isLoopSubplan, isOwnerOf, isReading, isSink, isSource, isSubplan, isSupportingBroadcastInputs, isUnconnected, propagateInputCardinality, propagateOutputCardinality, propagateOutputCardinality, replaceWith, setContainer, setEpoch, setInput, setName, setOutput

Field Details

reduceDescriptor

protected final ReduceDescriptor<Type> reduceDescriptor

Constructor Details

GlobalReduceOperator

public GlobalReduceOperator(FunctionDescriptor.SerializableBinaryOperator<Type> reduceFunction,
 Class<Type> typeClass)

Creates a new instance.

GlobalReduceOperator

public GlobalReduceOperator(ReduceDescriptor<Type> reduceDescriptor)

Creates a new instance.

Parameters:

reduceDescriptor - describes the reduction to be performed on the elements

GlobalReduceOperator

public GlobalReduceOperator(GlobalReduceOperator<Type> that)

Copies an instance (exclusive of broadcasts).

Parameters:

that - that should be copied

GlobalReduceOperator

public GlobalReduceOperator(ReduceDescriptor<Type> reduceDescriptor,
 DataSetType<Type> type)

Creates a new instance.

Parameters:

reduceDescriptor - describes the reduction to be performed on the elements

type - type of the reduce elements (i.e., type of UnaryToUnaryOperator.getInput() and UnaryToUnaryOperator.getOutput())

Method Details

getType

public DataSetType<Type> getType()

getReduceDescriptor

public ReduceDescriptor<Type> getReduceDescriptor()

createCardinalityEstimator

public Optional<CardinalityEstimator> createCardinalityEstimator(int outputIndex,
 Configuration configuration)

Description copied from interface: ElementaryOperator

Provide a CardinalityEstimator for the OutputSlot at outputIndex.

Parameters:

outputIndex - index of the OutputSlot for that the CardinalityEstimator is requested

configuration - if the CardinalityEstimator depends on further ones, use this to obtain the latter

Returns:

an Optional that might provide the requested instance