org.apache.pig.backend.hadoop.executionengine.mapReduceLayer
Class DistinctCombiner

java.lang.Object
  extended by org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.DistinctCombiner

public class DistinctCombiner
extends Object

A special implementation of combiner used only for distinct. This combiner does not even parse out the records. It just throws away duplicate values in the key in order ot minimize the data being sent to the reduce.


Nested Class Summary
static class DistinctCombiner.Combine
           
 
Constructor Summary
DistinctCombiner()
           
 
Method Summary
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

DistinctCombiner

public DistinctCombiner()


Copyright © 2007-2012 The Apache Software Foundation