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

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.optimizer.ProjectionPatcher.ProjectionFinder

Enclosing class:

ProjectionPatcher

public static class ProjectionPatcher.ProjectionFinder
extends AllExpressionVisitor

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

ProjectionPatcher.ProjectionFinder(OperatorPlan plan)

Method Summary

protected LogicalExpressionVisitor

getVisitor(LogicalExpressionPlan expr) Get a new instance of the expression visitor to apply to a given expression.

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

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

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

visit, 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

Constructor Detail

ProjectionPatcher.ProjectionFinder

public ProjectionPatcher.ProjectionFinder(OperatorPlan plan)
                                   throws FrontendException

Throws:

FrontendException

Method Detail

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