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The MongoDB Connector for Hadoop is a plugin for Hadoop that provides the ability to use MongoDB as an input source and/or an output destination.

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package com.mongodb.hadoop.pig.udf;

import com.mongodb.hadoop.pig.udf.types.PigBoxedMaxKey;
import org.apache.pig.data.Tuple;

import java.io.IOException;

/**
 * Pig UDF that always returns MaxKey().
 */
public class GenMaxKey extends ByteArrayTypeEvalFunc {
    @Override
    public PigBoxedMaxKey exec(final Tuple input) throws IOException {
        return new PigBoxedMaxKey();
    }
}