All Superinterfaces:

Serializable

All Known Subinterfaces:

AggregateFunction<IN,ACC,OUT>, CoGroupFunction<IN1,IN2,O>, CombineFunction<IN,OUT>, CrossFunction<IN1,IN2,OUT>, FilterFunction<T>, FlatJoinFunction<IN1,IN2,OUT>, FlatMapFunction<T,O>, GroupCombineFunction<IN,OUT>, GroupReduceFunction<T,O>, JoinFunction<IN1,IN2,OUT>, KeySelector<IN,KEY>, MapFunction<T,O>, MapPartitionFunction<T,O>, Partitioner<K>, ReduceFunction<T>, RichFunction

All Known Implementing Classes:

AbstractRichFunction, BulkIterationBase.TerminationCriterionMapper, NoOpFunction, NullByteKeySelector, RichAggregateFunction, RichCoGroupFunction, RichCrossFunction, RichFilterFunction, RichFlatJoinFunction, RichFlatMapFunction, RichGroupCombineFunction, RichGroupReduceFunction, RichJoinFunction, RichMapFunction, RichMapPartitionFunction, RichReduceFunction
```
@Public
public interface Function
extends Serializable
```
The base interface for all user-defined functions.
This interface is empty in order to allow extending interfaces to be SAM (single abstract method) interfaces that can be implemented via Java 8 lambdas.

Interface Function