Class IterativeImprovementBasedQueryOptimizer

java.lang.Object

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

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

All Implemented Interfaces:

PhysicalOptimizer

public class IterativeImprovementBasedQueryOptimizer
extends RandomizedQueryOptimizerBase

Field Summary

Fields

Modifier and Type	Field	Description
protected final StoppingConditionForIterativeImprovement	condition
protected final SimpleJoinOrderingQueryOptimizer	simpleOptimizer

Fields inherited from class se.liu.ida.hefquin.engine.queryproc.impl.poptimizer.randomized.RandomizedQueryOptimizerBase

costModel, l2pConverter, rng, rules

Constructor Summary

Constructors

Constructor	Description
IterativeImprovementBasedQueryOptimizer(StoppingConditionForIterativeImprovement x, LogicalToPhysicalPlanConverter l2pConverter, CostModel costModel, RuleInstances rewritingRules)

Method Summary

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

Methods inherited from class se.liu.ida.hefquin.engine.queryproc.impl.poptimizer.randomized.RandomizedQueryOptimizerBase

getNeighbours, getRandomElement

Methods inherited from class java.lang.Object

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

Field Details

condition

protected final StoppingConditionForIterativeImprovement condition

simpleOptimizer

protected final SimpleJoinOrderingQueryOptimizer simpleOptimizer

Constructor Details

IterativeImprovementBasedQueryOptimizer

public IterativeImprovementBasedQueryOptimizer(StoppingConditionForIterativeImprovement x,
 LogicalToPhysicalPlanConverter l2pConverter,
 CostModel costModel,
 RuleInstances rewritingRules)

Method Details

assumesLogicalMultiwayJoins

public boolean assumesLogicalMultiwayJoins()

optimize

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

Throws:

PhysicalOptimizationException

optimize

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

Throws:

PhysicalOptimizationException