org.apache.pig.newplan.logical.optimizer
Class AllExpressionVisitor

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

Direct Known Subclasses:

CastLineageSetter, ColumnAliasConversionVisitor, MapKeysPruneHelper.FullMapCollector, MapKeysPruneHelper.MapMarker, ProjectionPatcher.ProjectionFinder, ProjStarInUdfExpander, ScalarVisitor

public abstract class AllExpressionVisitor
extends LogicalRelationalNodesVisitor

A visitor that walks a logical plan and then applies a given LogicalExpressionVisitor to all expressions it encounters.

Field Summary

protected LogicalRelationalOperator

currentOp

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

currentWalker, DEFAULT_SCOPE, plan

Constructor Summary

AllExpressionVisitor(OperatorPlan plan, PlanWalker walker)

Method Summary

protected abstract LogicalExpressionVisitor	getVisitor(LogicalExpressionPlan expr) Get a new instance of the expression visitor to apply to a given expression.
void	visit(LOCogroup cg)
void	visit(LOCube cu)
void	visit(LOFilter filter)
void	visit(LOForEach foreach)
void	visit(LOGenerate gen)
void	visit(LOInnerLoad load)
void	visit(LOJoin join)
void	visit(LOLimit limit)
void	visit(LORank rank)
void	visit(LOSort sort)
void	visit(LOSplitOutput splitOutput)

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

visit, 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

Field Detail

currentOp

protected LogicalRelationalOperator currentOp

Constructor Detail

AllExpressionVisitor

public AllExpressionVisitor(OperatorPlan plan,
                            PlanWalker walker)
                     throws FrontendException

Parameters:

plan - LogicalPlan to visit

walker - Walker to use to visit the plan.

Throws:

FrontendException

Method Detail

getVisitor

protected abstract LogicalExpressionVisitor getVisitor(LogicalExpressionPlan expr)
                                                throws FrontendException

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

Parameters:

expr - LogicalExpressionPlan that will be visited

Returns:

a new LogicalExpressionVisitor for that expression

Throws:

FrontendException

visit

public void visit(LOFilter filter)
           throws FrontendException

Overrides:

visit in class LogicalRelationalNodesVisitor

Throws:

FrontendException

visit

public void visit(LOLimit limit)
           throws FrontendException

Overrides:

visit in class LogicalRelationalNodesVisitor

Throws:

FrontendException

visit

public void visit(LOJoin join)
           throws FrontendException

Overrides:

visit in class LogicalRelationalNodesVisitor

Throws:

FrontendException

visit

public void visit(LOCube cu)
           throws FrontendException

Overrides:

visit in class LogicalRelationalNodesVisitor

Throws:

FrontendException

visit

public void visit(LOCogroup cg)
           throws FrontendException

Overrides:

visit in class LogicalRelationalNodesVisitor

Throws:

FrontendException

visit

public void visit(LOForEach foreach)
           throws FrontendException

Overrides:

visit in class LogicalRelationalNodesVisitor

Throws:

FrontendException

visit

public void visit(LOGenerate gen)
           throws FrontendException

Overrides:

visit in class LogicalRelationalNodesVisitor

Throws:

FrontendException

visit

public void visit(LOInnerLoad load)
           throws FrontendException

Overrides:

visit in class LogicalRelationalNodesVisitor

Throws:

FrontendException

visit

public void visit(LOSplitOutput splitOutput)
           throws FrontendException

Overrides:

visit in class LogicalRelationalNodesVisitor

Throws:

FrontendException

visit

public void visit(LORank rank)
           throws FrontendException

Overrides:

visit in class LogicalRelationalNodesVisitor

Throws:

FrontendException

visit

public void visit(LOSort sort)
           throws FrontendException

Overrides:

visit in class LogicalRelationalNodesVisitor

Throws:

FrontendException