@Override
  public void initialize(QueryState queryState, QueryPlan queryPlan, TaskQueue taskQueue, Context context) {
    super.initialize(queryState, queryPlan, taskQueue, context);
    job = new JobConf(conf, MergeFileTask.class);
    jobExecHelper = new HadoopJobExecHelper(job, this.console, this, this);
  }
Task for fast merging of ORC and RC files.
ql/src/java/org/apache/hadoop/hive/ql/io/merge/MergeFileTask.java