@Override
  public Collection<Operator<? extends OperatorDesc>> getTopOperators() {
    return getWork().getMapWork().getAliasToWork().values();
  }
Given a Hive Configuration object - generate a command line fragment for passing such
configuration information to ExecDriver.
ql/src/java/org/apache/hadoop/hive/ql/exec/mr/ExecDriver.java