Examples of org.apache.pig.newplan.PlanWalker.walk()

org.apache.pig.newplan.PlanWalker.walk()
Begin traversing the graph. @param visitor Visitor this walker is being used by. This can't be set inthe constructor because the visitor is constructing this class, and does not yet have a 'this' pointer to send as an argument. @throws VisitorException if an error is encountered while walking.

        currentPlans.push(currentPlan);
        for (LogicalExpressionPlan plan : logPlans) {
            currentPlan = new PhysicalPlan();
            PlanWalker childWalker = new ReverseDependencyOrderWalkerWOSeenChk(plan);
            pushWalker(childWalker);
            childWalker.walk(new ExpToPhyTranslationVisitor( currentWalker.getPlan(), 
                    childWalker, sort, currentPlan, logToPhyMap));
            sortPlans.add(currentPlan);
            popWalker();
        }
        currentPlan = currentPlans.pop();

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        for (int i=0; i<exps.size(); i++) {
            currentPlan = new PhysicalPlan();
            // translate the expression plan
            PlanWalker childWalker = new ReverseDependencyOrderWalkerWOSeenChk(exps.get(i));
            pushWalker(childWalker);
            childWalker.walk(new ExpToPhyTranslationVisitor(exps.get(i),
                    childWalker, gen, currentPlan, logToPhyMap));            
            popWalker();
            
            List<Operator> leaves = exps.get(i).getSinks();
            for(Operator l: leaves) {

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                    // for each sink projection, get its input logical plan and translate it
                    Operator pred = preds.get(input);
                    childWalker = new SubtreeDependencyOrderWalker(inner, pred);
                    pushWalker(childWalker);
                    childWalker.walk(this);
                    popWalker();
                    
                    // get the physical operator of the leaf of input logical plan
                    PhysicalOperator leaf = logToPhyMap.get(pred);

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        currentPlans.push(currentPlan);
        for (LogicalExpressionPlan plan : logPlans) {
            currentPlan = new PhysicalPlan();
            PlanWalker childWalker = new ReverseDependencyOrderWalkerWOSeenChk(plan);
            pushWalker(childWalker);
            childWalker.walk(new ExpToPhyTranslationVisitor( currentWalker.getPlan(), 
                    childWalker, sort, currentPlan, logToPhyMap));
            sortPlans.add(currentPlan);
            popWalker();
        }
        currentPlan = currentPlans.pop();

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        for (int i=0; i<exps.size(); i++) {
            currentPlan = new PhysicalPlan();
            // translate the expression plan
            PlanWalker childWalker = new ReverseDependencyOrderWalkerWOSeenChk(exps.get(i));
            pushWalker(childWalker);
            childWalker.walk(new ExpToPhyTranslationVisitor(exps.get(i),
                    childWalker, gen, currentPlan, logToPhyMap));            
            popWalker();
            
            List<Operator> leaves = exps.get(i).getSinks();
            for(Operator l: leaves) {

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                    // for each sink projection, get its input logical plan and translate it
                    Operator pred = preds.get(input);
                    childWalker = new SubtreeDependencyOrderWalker(inner, pred);
                    pushWalker(childWalker);
                    childWalker.walk(this);
                    popWalker();
                    
                    // get the physical operator of the leaf of input logical plan
                    PhysicalOperator leaf = logToPhyMap.get(pred);

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        currentPlans.push(currentPlan);
        for (LogicalExpressionPlan plan : logPlans) {
            currentPlan = new PhysicalPlan();
            PlanWalker childWalker = new ReverseDependencyOrderWalkerWOSeenChk(plan);
            pushWalker(childWalker);
            childWalker.walk(new ExpToPhyTranslationVisitor( currentWalker.getPlan(),
                    childWalker, sort, currentPlan, logToPhyMap));
            sortPlans.add(currentPlan);
            popWalker();
        }
        currentPlan = currentPlans.pop();

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                currentPlans.push(currentPlan);
                for (LogicalExpressionPlan plan : logPlans) {
                    currentPlan = new PhysicalPlan();
                    PlanWalker childWalker = new ReverseDependencyOrderWalkerWOSeenChk(plan);
                    pushWalker(childWalker);
                    childWalker.walk(new ExpToPhyTranslationVisitor( currentWalker.getPlan(),
                            childWalker, loRank, currentPlan, logToPhyMap));
                    rankPlans.add(currentPlan);
                    popWalker();
                }
                currentPlan = currentPlans.pop();

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        for (int i=0; i<exps.size(); i++) {
            currentPlan = new PhysicalPlan();
            // translate the expression plan
            PlanWalker childWalker = new ReverseDependencyOrderWalkerWOSeenChk(exps.get(i));
            pushWalker(childWalker);
            childWalker.walk(new ExpToPhyTranslationVisitor(exps.get(i),
                    childWalker, gen, currentPlan, logToPhyMap));
            popWalker();


            List<Operator> leaves = exps.get(i).getSinks();
            for(Operator l: leaves) {

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                    // for each sink projection, get its input logical plan and translate it
                    Operator pred = preds.get(input);
                    childWalker = new SubtreeDependencyOrderWalker(inner, pred);
                    pushWalker(childWalker);
                    childWalker.walk(this);
                    popWalker();


                    // get the physical operator of the leaf of input logical plan
                    PhysicalOperator leaf = logToPhyMap.get(pred);

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