Package org.apache.wayang.basic.mapping

Class ReduceByMapping

java.lang.Object

org.apache.wayang.basic.mapping.ReduceByMapping

All Implemented Interfaces:

Mapping

public class ReduceByMapping
extends Object
implements Mapping

This mapping detects combinations of the GroupByOperator and ReduceOperator and merges them into a single ReduceByOperator.

Constructor Summary

Constructors

Constructor	Description
ReduceByMapping()

Method Summary

Modifier and Type	Method	Description
Collection<PlanTransformation>	getTransformations()

Methods inherited from class java.lang.Object

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

Constructor Details

ReduceByMapping

public ReduceByMapping()

Method Details

getTransformations

public Collection<PlanTransformation> getTransformations()

Specified by:

getTransformations in interface Mapping

Returns:

the transformations that make up this mapping