org.apache.pig.backend.hadoop.executionengine.mapReduceLayer
Class PigMapReduce.MapWithComparator
java.lang.Object
org.apache.hadoop.mapred.MapReduceBase
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce.MapWithComparator
- All Implemented Interfaces:
- Closeable, org.apache.hadoop.mapred.JobConfigurable, org.apache.hadoop.mapred.Mapper<org.apache.hadoop.io.Text,Tuple,PigNullableWritable,org.apache.hadoop.io.Writable>
- Enclosing class:
- PigMapReduce
public static class PigMapReduce.MapWithComparator
- extends PigMapBase
- implements org.apache.hadoop.mapred.Mapper<org.apache.hadoop.io.Text,Tuple,PigNullableWritable,org.apache.hadoop.io.Writable>
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)
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface org.apache.hadoop.mapred.Mapper |
map |
Methods inherited from interface org.apache.hadoop.mapred.JobConfigurable |
configure |
PigMapReduce.MapWithComparator
public PigMapReduce.MapWithComparator()
collect
public void collect(org.apache.hadoop.mapred.OutputCollector<PigNullableWritable,org.apache.hadoop.io.Writable> oc,
Tuple tuple)
throws ExecException,
IOException
- Specified by:
collect
in class PigMapBase
- Throws:
ExecException
IOException
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