org.apache.pig.newplan.logical.rules
Class MapKeysPruneHelper.MapMarker

java.lang.Object
  org.apache.pig.newplan.PlanVisitor
      org.apache.pig.newplan.logical.relational.LogicalRelationalNodesVisitor
          org.apache.pig.newplan.logical.optimizer.AllExpressionVisitor
              org.apache.pig.newplan.logical.rules.MapKeysPruneHelper.MapMarker

Enclosing class:

MapKeysPruneHelper

public static class MapKeysPruneHelper.MapMarker
extends AllExpressionVisitor

This class collects all the information required to create the list of keys required for a map

Field Summary

Fields inherited from class org.apache.pig.newplan.logical.optimizer.AllExpressionVisitor

currentOp

Fields inherited from class org.apache.pig.newplan.PlanVisitor

currentWalker, DEFAULT_SCOPE, plan

Constructor Summary

protected

MapKeysPruneHelper.MapMarker(OperatorPlan plan)

Method Summary

protected LogicalExpressionVisitor	getVisitor(LogicalExpressionPlan expr) Get a new instance of the expression visitor to apply to a given expression.
void	visit(LOFilter filter)
void	visit(LOGenerate gen)
void	visit(LOJoin join)
void	visit(LOLoad load)
void	visit(LOSort sort)
void	visit(LOSplitOutput splitOutput)

Methods inherited from class org.apache.pig.newplan.logical.optimizer.AllExpressionVisitor

visit, visit, visit, visit, visit, visit

Methods inherited from class org.apache.pig.newplan.logical.relational.LogicalRelationalNodesVisitor

visit, visit, visit, visit, visit, visit, visit

Methods inherited from class org.apache.pig.newplan.PlanVisitor

getPlan, popWalker, pushWalker, visit

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MapKeysPruneHelper.MapMarker

protected MapKeysPruneHelper.MapMarker(OperatorPlan plan)
                                throws FrontendException

Throws:

FrontendException

Method Detail

visit

public void visit(LOLoad load)
           throws FrontendException

Overrides:

visit in class LogicalRelationalNodesVisitor

Throws:

FrontendException

visit

public void visit(LOFilter filter)
           throws FrontendException

Overrides:

visit in class AllExpressionVisitor

Throws:

FrontendException

visit

public void visit(LOJoin join)
           throws FrontendException

Overrides:

visit in class AllExpressionVisitor

Throws:

FrontendException

visit

public void visit(LOGenerate gen)
           throws FrontendException

Overrides:

visit in class AllExpressionVisitor

Throws:

FrontendException

visit

public void visit(LOSort sort)
           throws FrontendException

Overrides:

visit in class AllExpressionVisitor

Throws:

FrontendException

visit

public void visit(LOSplitOutput splitOutput)
           throws FrontendException

Overrides:

visit in class AllExpressionVisitor

Throws:

FrontendException

getVisitor

protected LogicalExpressionVisitor getVisitor(LogicalExpressionPlan expr)
                                       throws FrontendException

Description copied from class: AllExpressionVisitor

Get a new instance of the expression visitor to apply to a given expression.

Specified by:

getVisitor in class AllExpressionVisitor

Parameters:

expr - LogicalExpressionPlan that will be visited

Returns:

a new LogicalExpressionVisitor for that expression

Throws:

FrontendException