| Class | Description | 
|---|---|
| FieldSelectionHelper | This class implements a mapper/reducer class that can be used to perform
 field selections in a manner similar to unix cut. | 
| FieldSelectionMapper<K,V> | This class implements a mapper class that can be used to perform
 field selections in a manner similar to unix cut. | 
| FieldSelectionReducer<K,V> | This class implements a reducer class that can be used to perform field
 selections in a manner similar to unix cut. | 
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