Method pathExists

src/org/apache/pig/impl/plan/OperatorPlan.java:371–383

A method to check if there is a path from a given node to another node @param from the start node for checking @param to the end node for checking @return true if path exists, false otherwise

(E from, E to)

     * @return true if path exists, false otherwise
     */
    public boolean pathExists(E from, E to) {
        List<E> successors = getSuccessors(from);
        if(successors == null || successors.size() == 0) {
            return false;
        }
        for (E successor : successors) {
            if(successor.equals(to) 
                    || pathExists(successor, to)) {
                return true;
            }
        }
        return false;
    }

    public Iterator<E> iterator() { 
        return mOps.keySet().iterator();