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

Annotation Type FunctionAnnotation.ConstantFieldsFirstExcept

@Target(value=TYPE)
@Retention(value=RUNTIME)
public static @interface 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. A field is considered to be constant if its value is not changed and copied to the same position of output record. It is very important to follow a conservative strategy when specifying constant fields. Only fields that are always constant (regardless of value, stub call, etc.) to the output may be inserted! Otherwise, the correct execution of a program can not be guaranteed. So if in doubt, do not add a field to this set. This annotation is mutually exclusive with the FunctionAnnotation.ConstantFieldsFirst annotation. If this annotation and the FunctionAnnotation.ConstantFieldsFirst annotation is not set, it is assumed that no field is constant.

Required Element Summary

Required Elements

Modifier and Type	Required Element and Description
int[]	value

Element Detail

value

public abstract int[] value