Interface Hierarchy
- java.io.Serializable
- org.apache.flink.api.common.functions.Function
- org.apache.flink.api.java.functions.KeySelector<IN,KEY> (also extends java.io.Serializable)
- org.apache.flink.api.java.functions.KeySelector<IN,KEY> (also extends org.apache.flink.api.common.functions.Function)
- org.apache.flink.api.common.functions.Function