org.apache.pig.backend.hadoop.executionengine.mapReduceLayer
Class PigGenericMapReduce.MapWithComparator

java.lang.Object
  org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.Text,Tuple,PigNullableWritable,org.apache.hadoop.io.Writable>
      org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase
          org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase
              org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapReduce.MapWithComparator

Enclosing class:

PigGenericMapReduce

public static class PigGenericMapReduce.MapWithComparator
extends org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase

This "specialized" map class is ONLY to be used in pig queries with order by a udf. A UDF used for comparison in the order by expects to be handed tuples. Hence this map class ensures that the "key" used in the order by is wrapped into a tuple (if it isn't already a tuple)

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase

org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.IllustratorContext

Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.Mapper

org.apache.hadoop.mapreduce.Mapper.Context

Field Summary

Fields inherited from class org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase

errorInMap, keyType, mp, stores, tf

Constructor Summary

PigGenericMapReduce.MapWithComparator()

Method Summary

void	collect(org.apache.hadoop.mapreduce.Mapper.Context oc, Tuple tuple)

Methods inherited from class org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase

getIllustratorContext, inIllustrator

Methods inherited from class org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigGenericMapBase

cleanup, getKeyType, map, runPipeline, setKeyType, setMapPlan, setup

Methods inherited from class org.apache.hadoop.mapreduce.Mapper

run

Methods inherited from class java.lang.Object

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

Constructor Detail

PigGenericMapReduce.MapWithComparator

public PigGenericMapReduce.MapWithComparator()

Method Detail

collect

public void collect(org.apache.hadoop.mapreduce.Mapper.Context oc,
                    Tuple tuple)
             throws InterruptedException,
                    IOException

Specified by:

collect in class PigGenericMapBase

Throws:

InterruptedException

IOException