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

Class Summary

Class	Description
CoGroupFunction	The CoGroupFunction is the base class for functions that are invoked by a CoGroupOperator.
CrossFunction	The CrossFunction is the base class for functions that are invoked by a CrossOperator.
FunctionAnnotation	This class defines the semantic assertions that can be added to functions.
JoinFunction	The JoinFunction must implementation by functions of a JoinOperator.
MapFunction	The MapFunction must be extended to provide a mapper implementation By definition, the mapper is called for each individual input record.
ReduceFunction	The ReduceFunction must be extended to provide a reducer implementation, as invoked by a ReduceOperator.

Annotation Types Summary

Annotation Type	Description
FunctionAnnotation.AllFieldsConstants	Specifies that all fields of an input record that are unchanged in the output of a MapFunction, or ReduceFunction).
FunctionAnnotation.ConstantFields	Specifies the fields of an input record that are unchanged in the output of a stub with a single input ( MapFunction, ReduceFunction).
FunctionAnnotation.ConstantFieldsExcept	Specifies the fields of an input record that are changed in the output of a stub with a single input ( MapFunction, ReduceFunction).
FunctionAnnotation.ConstantFieldsFirst	Specifies the fields of an input record of the first input that are unchanged in the output of a stub with two inputs ( CrossFunction, JoinFunction, CoGroupFunction) A field is considered to be constant if its value is not changed and copied to the same position of output record.
FunctionAnnotation.ConstantFieldsFirstExcept	Specifies the fields of an input record of the first input that are changed in the output of a stub with two inputs ( CrossFunction, JoinFunction, CoGroupFunction) All other fields are assumed to be constant.
FunctionAnnotation.ConstantFieldsSecond	Specifies the fields of an input record of the second input that are unchanged in the output of a stub with two inputs ( CrossFunction, JoinFunction, CoGroupFunction) A field is considered to be constant if its value is not changed and copied to the same position of output record.
FunctionAnnotation.ConstantFieldsSecondExcept	Specifies the fields of an input record of the second input that are changed in the output of a stub with two inputs ( CrossFunction, JoinFunction, CoGroupFunction) All other fields are assumed to be constant.