org.apache.flink.api.java.functions (Flink : Core 1.18.1-cp1 API)

Interface Summary
Interface Description

KeySelector<IN,KEY>
The KeySelector allows to use deterministic objects for operations such as reduce, reduceGroup, join, coGroup, etc.
Class Summary
Class Description

NullByteKeySelector<T>
Used as a dummy KeySelector to allow using keyed operators for non-keyed use cases.

Package org.apache.flink.api.java.functions