| Interface | Description | 
|---|---|
| ComposableInputFormat<K extends WritableComparable,V extends Writable> | Refinement of InputFormat requiring implementors to provide
 ComposableRecordReader instead of RecordReader. | 
| ComposableRecordReader<K extends WritableComparable,V extends Writable> | Additional operations required of a RecordReader to participate in a join. | 
| ResetableIterator<T extends Writable> | This defines an interface to a stateful Iterator that can replay elements
 added to it directly. | 
| Class | Description | 
|---|---|
| ArrayListBackedIterator<X extends Writable> | This class provides an implementation of ResetableIterator. | 
| CompositeInputFormat<K extends WritableComparable> | An InputFormat capable of performing joins over a set of data sources sorted
 and partitioned the same way. | 
| CompositeInputSplit | This InputSplit contains a set of child InputSplits. | 
| CompositeRecordReader<K extends WritableComparable,V extends Writable,X extends Writable> | A RecordReader that can effect joins of RecordReaders sharing a common key
 type and partitioning. | 
| InnerJoinRecordReader<K extends WritableComparable> | Full inner join. | 
| JoinRecordReader<K extends WritableComparable> | Base class for Composite joins returning Tuples of arbitrary Writables. | 
| MultiFilterRecordReader<K extends WritableComparable,V extends Writable> | Base class for Composite join returning values derived from multiple
 sources, but generally not tuples. | 
| OuterJoinRecordReader<K extends WritableComparable> | Full outer join. | 
| OverrideRecordReader<K extends WritableComparable,V extends Writable> | Prefer the "rightmost" data source for this key. | 
| Parser | Very simple shift-reduce parser for join expressions. | 
| Parser.Node | |
| Parser.NodeToken | |
| Parser.NumToken | |
| Parser.StrToken | |
| Parser.Token | Tagged-union type for tokens from the join expression. | 
| StreamBackedIterator<X extends Writable> | This class provides an implementation of ResetableIterator. | 
| TupleWritable | Writable type storing multiple  Writables. | 
| WrappedRecordReader<K extends WritableComparable,U extends Writable> | Proxy class for a RecordReader participating in the join framework. | 
| Enum | Description | 
|---|---|
| Parser.TType | 
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