@SuppressWarnings("unchecked")
  public Operator<? extends OperatorDesc> cloneOp() throws CloneNotSupportedException {
    T descClone = (T) conf.clone();
    Operator<? extends OperatorDesc> ret =
        OperatorFactory.getAndMakeChild(cContext, descClone, getSchema());
    return ret;
  }
Clones only the operator. The children and parent are set
to null.
@return Cloned operator
@throws CloneNotSupportedException
ql/src/java/org/apache/hadoop/hive/ql/exec/Operator.java