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If I have the following data structure (a relation) in Pig and I want to pass it to a Java UDF, wondering what should be the related Java data type of the input parameter?

(student relation is a bag, schema is ID as int, a tuple contains an interest bag and a classes bag).

student: {id: int,(interest: {(value: chararray)},classes: {(value: chararray)})}

thanks in advance, Lin

Lin Ma
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1 Answers1

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I think it can be done as shown below. 

 public class BagUdf extends EvalFunc<DataBag> {

public <returnType> exec(Tuple input) throws IOException {
//iterate over the bag elements
for (Tuple t : (DataBag)input.get(0)) {
     // process tuple t
}
return returnVal;
}

Please refer to this link

SurjanSRawat
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