Examples of org.apache.pig.newplan.DependencyOrderWalker

org.apache.pig.newplan.DependencyOrderWalker
A walker to walk graphs in dependency order. It is guaranteed that a node will not be visited until all of its predecessors have been visited. This is equivalent to doing a topilogical sort on the graph and then visiting the nodes in order.

import org.apache.pig.newplan.logical.relational.LogicalRelationalNodesVisitor;


public class UidResetter extends LogicalRelationalNodesVisitor {


    public UidResetter(OperatorPlan plan) throws FrontendException {
        super(plan, new DependencyOrderWalker(plan));
    }

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public class DanglingNestedNodeRemover extends LogicalRelationalNodesVisitor {


    public DanglingNestedNodeRemover(OperatorPlan plan)
            throws FrontendException {
        super(plan, new DependencyOrderWalker(plan));
    }

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        this(plan, false);
    }


    public SchemaResetter(OperatorPlan plan, boolean skipDuplicateUidCheck) 
            throws FrontendException {
        super(plan, new DependencyOrderWalker(plan));
        this.skipDuplicateUidCheck = skipDuplicateUidCheck;
    }

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    // This value points to the current LogicalRelationalOperator we are working on
    protected LogicalRelationalOperator currentOp;
    
    public ExpToPhyTranslationVisitor(OperatorPlan plan, LogicalRelationalOperator op, PhysicalPlan phyPlan, 
            Map<Operator, PhysicalOperator> map) throws FrontendException {
        this(plan, new DependencyOrderWalker(plan), op, phyPlan, map);
    }

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                    }
                }
                
                // visit expression associated with currOp. If it refers to any other operator
                // that operator is also going to be enqueued.
                currOp.accept( new AllExpressionVisitor( plan, new DependencyOrderWalker( plan ) ) {
                        @Override
                        protected LogicalExpressionVisitor getVisitor(LogicalExpressionPlan exprPlan)
                        throws FrontendException {
                            return new LogicalExpressionVisitor( exprPlan, new DependencyOrderWalker( exprPlan ) ) {
                                @Override
                                public void visit(ScalarExpression expr) throws FrontendException {
                                    Operator refOp = expr.getImplicitReferencedOperator();
                                    if( !queue.contains( refOp ) )
                                        queue.add( refOp );

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        class CastFinder extends AllExpressionVisitor {
            List<CastExpression> casts = new ArrayList<CastExpression>();
            
            public CastFinder(OperatorPlan plan)
                    throws FrontendException {
                super(plan, new DependencyOrderWalker(plan));
            }

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        plan.connect(fred, joe);
        plan.connect(joe, bob);
        
        SillyVisitor v =
            new SillyVisitor(plan, new DependencyOrderWalker(plan));
        
        v.visit();
        
        String s = v.getVisitPattern();

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        plan.connect(joe, bob);
        plan.connect(bob, jill);
        plan.connect(jane, jill);
        
        SillyVisitor v =
            new SillyVisitor(plan, new DependencyOrderWalker(plan));
        
        v.visit();
        
        String s = v.getVisitPattern();

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        plan.connect(joe, bob);
        plan.connect(bob, jill);
        plan.connect(bob, jane);
        
        SillyVisitor v =
            new SillyVisitor(plan, new DependencyOrderWalker(plan));
        
        v.visit();
        
        String s = v.getVisitPattern();

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                    }
                }
                
                // visit expression associated with currOp. If it refers to any other operator
                // that operator is also going to be enqueued.
                currOp.accept( new AllExpressionVisitor( plan, new DependencyOrderWalker( plan ) ) {
                        @Override
                        protected LogicalExpressionVisitor getVisitor(LogicalExpressionPlan exprPlan)
                        throws FrontendException {
                            return new LogicalExpressionVisitor( exprPlan, new DependencyOrderWalker( exprPlan ) ) {
                                @Override
                                public void visit(ScalarExpression expr) throws FrontendException {
                                    Operator refOp = expr.getImplicitReferencedOperator();
                                    if( !queue.contains( refOp ) )
                                        queue.add( refOp );

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org.apache.pig.backend.hadoop.executionengine.HExecutionEngine$SortInfoSetter

org.apache.pig.newplan.logical.expression.ExpToPhyTranslationVisitor

org.apache.pig.newplan.logical.optimizer.DanglingNestedNodeRemover

org.apache.pig.newplan.logical.optimizer.ProjectionPatcher$ProjectionFinder

org.apache.pig.newplan.logical.optimizer.SchemaResetter

org.apache.pig.newplan.logical.optimizer.UidResetter

org.apache.pig.newplan.logical.relational.LogToPhyTranslationVisitor

org.apache.pig.newplan.logical.rules.ConstantCalculator$ConstantCalculatorTransformer$ConstantCalculatorLogicalPlanVisitor

org.apache.pig.newplan.logical.rules.MapKeysPruneHelper$FullMapCollector

org.apache.pig.newplan.logical.rules.MapKeysPruneHelper$FullMapCollector$FullMapExpCollector

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