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package org.apache.pig.newplan;
Do a depth first traversal of the graph.
public class DepthFirstWalker extends PlanWalker {
    public DepthFirstWalker(OperatorPlan plan) {
    public PlanWalker spawnChildWalker(OperatorPlan plan) {
        return new DepthFirstWalker(plan);

Begin traversing the graph.

visitor Visitor this walker is being used by.
org.apache.pig.impl.logicalLayer.FrontendException if an error is encountered while walking.
    public void walk(PlanVisitor visitorthrows FrontendException {
        List<Operatorroots = .getSources();
        Set<Operatorseen = new HashSet<Operator>();
    private void depthFirst(Operator node,
                            PlanVisitor visitorthrows FrontendException {
        if (successors == nullreturn;
        for (Operator suc : successors) {
            if (seen.add(suc)) {
                Collection<OperatornewSuccessors = Utils.mergeCollection(.getSuccessors(suc), .getSoftLinkSuccessors(suc));
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