org.apache.pig.builtin

Annotation Type OutputSchema

@InterfaceAudience.Public
 @InterfaceStability.Unstable
 @Documented
 @Retention(value=RUNTIME)
public @interface OutputSchema

An EvalFunc can annotated with an OutputSchema to tell Pig what the expected output is. This can be used in place of EvalFunc.outputSchema(Schema)

The default implementation of EvalFunc.outputSchema(Schema) will look at this annotation and return an interpreted schema, if the annotation is present.

Implementing a custom EvalFunc.outputSchema(Schema) will override the annotation (unless you deal with it explicitly, or by calling super.outputSchema(schema)).

Here's an example of a complex schema declared in an annotation: @OutputSchema("y:bag{t:tuple(len:int,word:chararray)}")

Required Element Summary

Required Elements

Modifier and Type	Required Element and Description
java.lang.String	value

Element Detail

value

public abstract java.lang.String value