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## Package org.apache.hadoop.mapreduce.lib.join

Interface Summary
ResetableIterator<T extends Writable> | This defines an interface to a stateful Iterator that can replay elements added to it directly.

Class Summary
ArrayListBackedIterator<X extends Writable> | This class provides an implementation of ResetableIterator.
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.
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 `Writable`s.
WrappedRecordReader<K extends WritableComparable<?>,U extends Writable> | Proxy class for a RecordReader participating in the join framework.

Enum Summary
Parser.TType |

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