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.


        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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 */
public class OptimizeLimitPlanPrinter extends LogicalRelationalNodesVisitor {
    private StringBuilder sb = null ;
    
    public OptimizeLimitPlanPrinter(LogicalPlan plan) throws FrontendException {
        super( plan, new DependencyOrderWalker( plan ) );
        sb = new StringBuilder() ;
    }

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class MyLogicalExpressionVisitor extends LogicalExpressionVisitor {
    private StringBuilder sb = null ;
    
    public MyLogicalExpressionVisitor(LogicalExpressionPlan plan) throws FrontendException {
        super( plan, new DependencyOrderWalker( plan ) );
        sb = new StringBuilder() ;
    }

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


public class SchemaAliasVisitor extends LogicalRelationalNodesVisitor {


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

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    private CompilationMessageCollector msgCollector;


    public TypeCheckingRelVisitor(OperatorPlan plan, CompilationMessageCollector msgCollector)
    throws FrontendException {
        super(plan, new DependencyOrderWalker(plan));
        this.msgCollector = msgCollector;


    }

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


public class SortInfoSetter extends LogicalRelationalNodesVisitor {


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

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public class DuplicateForEachColumnRewriteVisitor
             extends LogicalRelationalNodesVisitor {


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

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 * The expansion happens only if input schema is not null
 */
public class ProjStarInUdfExpander extends AllExpressionVisitor {


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

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