vishnu.model.algebra.optimizer
Class ParentVisitorTranslationStage

java.lang.Object
  vishnu.model.algebra.optimizer.AbstractTranslationStage
      vishnu.model.algebra.optimizer.ParentVisitorTranslationStage

All Implemented Interfaces:

TranslationStage, VisitorTranslationStage

Direct Known Subclasses:

AttributeInferringStage, ColumnInferringStage

public abstract class ParentVisitorTranslationStage
extends AbstractTranslationStage
implements VisitorTranslationStage

notes: this stage only works over a relation get from a CannonicalPlanner since it doesn't expect projections above the root relation. TODO refactor this class and VisitorTranslationStage

Constructor Summary

ParentVisitorTranslationStage()

Method Summary

Relation	perform(Relation r, UserContext uc) Contract: subclasses should return super.perform(result)
Relation	visitAll(Relation r, UserContext uc) notes: visits first childs and then parent.

Methods inherited from class vishnu.model.algebra.optimizer.AbstractTranslationStage

attach

Methods inherited from class java.lang.Object

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

Methods inherited from interface vishnu.model.algebra.optimizer.VisitorTranslationStage

visit

Constructor Detail

ParentVisitorTranslationStage

public ParentVisitorTranslationStage()

Method Detail

perform

public Relation perform(Relation r,
                        UserContext uc)

Description copied from class: AbstractTranslationStage

Contract: subclasses should return super.perform(result)

Specified by:

perform in interface TranslationStage

Overrides:

perform in class AbstractTranslationStage

visitAll

public Relation visitAll(Relation r,
                         UserContext uc)

notes: visits first childs and then parent.