public static MapredWork getMapRedWork(Configuration conf) {
    MapredWork w = new MapredWork();
    w.setMapWork(getMapWork(conf));
    w.setReduceWork(getReduceWork(conf));
    return w;
  }
ReduceField:
KEY: record key
VALUE: record value
ql/src/java/org/apache/hadoop/hive/ql/exec/Utilities.java