Method pathExists

src/org/apache/pig/newplan/BaseOperatorPlan.java:471–482

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

(Operator from, Operator to)

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

    /**
     * Move everything below a given operator to the new operator plan.  The specified operator will