vishnu.model.algebra.optimizer
Class JoinTranslationStage

java.lang.Object
  vishnu.model.algebra.optimizer.AbstractTranslationStage
      vishnu.model.algebra.optimizer.ChildVisitorTranslationStage
          vishnu.model.algebra.optimizer.JoinTranslationStage

All Implemented Interfaces:

TranslationStage, VisitorTranslationStage

public class JoinTranslationStage
extends ChildVisitorTranslationStage

Author:

Hernan Rancati

Constructor Summary

JoinTranslationStage()

Method Summary

protected boolean	isEquiJoin(java.util.Collection<SQLOperand> conjunctions)
protected boolean	isEquiJoin(Selection r)
Relation	visit(Relation r, UserContext uc)

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

perform

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

Constructor Detail

JoinTranslationStage

public JoinTranslationStage()

Method Detail

visit

public Relation visit(Relation r,
                      UserContext uc)

Specified by:

visit in interface VisitorTranslationStage

Specified by:

visit in class ChildVisitorTranslationStage

isEquiJoin

protected boolean isEquiJoin(Selection r)

isEquiJoin

protected boolean isEquiJoin(java.util.Collection<SQLOperand> conjunctions)