tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/master/LazyTaskScheduler.java [127:139]:
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  static {
    ExecutionBlockId nullSubQuery = QueryIdFactory.newExecutionBlockId(QueryIdFactory.NULL_QUERY_ID, 0);
    NULL_ATTEMPT_ID = QueryIdFactory.newQueryUnitAttemptId(QueryIdFactory.newQueryUnitId(nullSubQuery, 0), 0);

    TajoWorkerProtocol.QueryUnitRequestProto.Builder builder =
        TajoWorkerProtocol.QueryUnitRequestProto.newBuilder();
    builder.setId(NULL_ATTEMPT_ID.getProto());
    builder.setShouldDie(true);
    builder.setOutputTable("");
    builder.setSerializedData("");
    builder.setClusteredOutput(false);
    stopTaskRunnerReq = builder.build();
  }
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tajo-core/tajo-core-backend/src/main/java/org/apache/tajo/master/DefaultTaskScheduler.java [113:125]:
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  static {
    ExecutionBlockId nullSubQuery = QueryIdFactory.newExecutionBlockId(QueryIdFactory.NULL_QUERY_ID, 0);
    NULL_ATTEMPT_ID = QueryIdFactory.newQueryUnitAttemptId(QueryIdFactory.newQueryUnitId(nullSubQuery, 0), 0);

    TajoWorkerProtocol.QueryUnitRequestProto.Builder builder =
        TajoWorkerProtocol.QueryUnitRequestProto.newBuilder();
    builder.setId(NULL_ATTEMPT_ID.getProto());
    builder.setShouldDie(true);
    builder.setOutputTable("");
    builder.setSerializedData("");
    builder.setClusteredOutput(false);
    stopTaskRunnerReq = builder.build();
  }
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