Class TwoPhaseQueryOptimizer

java.lang.Object

se.liu.ida.hefquin.engine.queryproc.impl.poptimizer.randomized.TwoPhaseQueryOptimizer

All Implemented Interfaces:

PhysicalOptimizer

public class TwoPhaseQueryOptimizer
extends Object
implements PhysicalOptimizer

Field Summary

Fields

Modifier and Type	Field	Description
protected final IterativeImprovementBasedQueryOptimizer	optimizer1
protected final SimulatedAnnealing	optimizer2

Constructor Summary

Constructors

Constructor	Description
TwoPhaseQueryOptimizer(StoppingConditionForIterativeImprovement condition1, EquilibriumConditionForSimulatedAnnealing condition2, LogicalToPhysicalPlanConverter l2pConverter, CostModel costModel, RuleInstances rewritingRules)

Method Summary

Modifier and Type	Method	Description
boolean	assumesLogicalMultiwayJoins()
Pair<PhysicalPlan,PhysicalOptimizationStats>	optimize(LogicalPlan initialPlan)

Methods inherited from class java.lang.Object

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

Field Details

optimizer1

protected final IterativeImprovementBasedQueryOptimizer optimizer1

optimizer2

protected final SimulatedAnnealing optimizer2

Constructor Details

TwoPhaseQueryOptimizer

public TwoPhaseQueryOptimizer(StoppingConditionForIterativeImprovement condition1,
 EquilibriumConditionForSimulatedAnnealing condition2,
 LogicalToPhysicalPlanConverter l2pConverter,
 CostModel costModel,
 RuleInstances rewritingRules)

Method Details

assumesLogicalMultiwayJoins

public boolean assumesLogicalMultiwayJoins()

Specified by:

assumesLogicalMultiwayJoins in interface PhysicalOptimizer

optimize

public Pair<PhysicalPlan,PhysicalOptimizationStats> optimize(LogicalPlan initialPlan)
                                                      throws PhysicalOptimizationException

Specified by:

optimize in interface PhysicalOptimizer

Throws:

PhysicalOptimizationException