org.apache.pig.impl.logicalLayer.optimizer
Class ImplicitSplitInserter

java.lang.Object
  extended by org.apache.pig.impl.plan.PlanVisitor<O,P>
      extended by org.apache.pig.impl.plan.optimizer.Transformer<LogicalOperator,LogicalPlan>
          extended by org.apache.pig.impl.logicalLayer.optimizer.LogicalTransformer
              extended by org.apache.pig.impl.logicalLayer.optimizer.ImplicitSplitInserter

public class ImplicitSplitInserter
extends LogicalTransformer


Field Summary
 
Fields inherited from class org.apache.pig.impl.plan.PlanVisitor
mCurrentWalker, mPlan
 
Constructor Summary
ImplicitSplitInserter(LogicalPlan plan)
           
 
Method Summary
 boolean check(List<LogicalOperator> nodes)
          check if the transform should be done.
 void transform(List<LogicalOperator> nodes)
          Transform the tree
 
Methods inherited from class org.apache.pig.impl.logicalLayer.optimizer.LogicalTransformer
fixUpContainedPlans, insertAfter, insertBetween, rebuildProjectionMaps, rebuildSchemas, reset
 
Methods inherited from class org.apache.pig.impl.plan.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

ImplicitSplitInserter

public ImplicitSplitInserter(LogicalPlan plan)
Method Detail

check

public boolean check(List<LogicalOperator> nodes)
              throws OptimizerException
Description copied from class: Transformer
check if the transform should be done. If this is being called then the pattern matches, but there may be other criteria that must be met as well.

Specified by:
check in class Transformer<LogicalOperator,LogicalPlan>
Parameters:
nodes - - List of nodes declared in transform ($1 = nodes[0], etc.) Remember that somes entries in node[] may be NULL since they may not be created until after the transform.
Returns:
true if the transform should be done.
Throws:
OptimizerException

transform

public void transform(List<LogicalOperator> nodes)
               throws OptimizerException
Description copied from class: Transformer
Transform the tree

Specified by:
transform in class Transformer<LogicalOperator,LogicalPlan>
Parameters:
nodes - - List of nodes declared in transform ($1 = nodes[0], etc.) This call must destruct any nodes that are being removed as part of the transform and remove them from the nodes vector and construct any that are being created as part of the transform and add them at the appropriate point to the nodes vector.
Throws:
OptimizerException


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