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package org.apache.pig.builtin;
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)}")

public @interface OutputSchema {
    String value();
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