Package se.liu.ida.hefquin.engine.queryproc.impl.poptimizer

Class PhysicalOptimizerBase

java.lang.Object

se.liu.ida.hefquin.engine.queryproc.impl.poptimizer.PhysicalOptimizerBase

All Implemented Interfaces:

PhysicalOptimizer

Direct Known Subclasses:

PhysicalOptimizerWithoutOptimization, SimpleJoinOrderingQueryOptimizer

public abstract class PhysicalOptimizerBase
extends Object
implements PhysicalOptimizer

Field Summary

Fields

Modifier and Type	Field	Description
protected final LogicalToPhysicalPlanConverter	l2pConverter

Constructor Summary

Constructors

Constructor	Description
PhysicalOptimizerBase(LogicalToPhysicalPlanConverter l2pConverter)

Method Summary

Modifier and Type	Method	Description
protected abstract boolean	keepMultiwayJoinsInInitialPhysicalPlan()	Return true if this optimizer expects that multiway joins are carried over from the given logical plan into the initial physical plan.
final Pair<PhysicalPlan,PhysicalOptimizationStats>	optimize(LogicalPlan lp)
protected abstract Pair<PhysicalPlan,PhysicalOptimizationStats>	optimize(PhysicalPlan initialPhysicalPlan)

Methods inherited from class java.lang.Object

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

Methods inherited from interface se.liu.ida.hefquin.engine.queryproc.PhysicalOptimizer

assumesLogicalMultiwayJoins

Field Details

l2pConverter

protected final LogicalToPhysicalPlanConverter l2pConverter

Constructor Details

PhysicalOptimizerBase

public PhysicalOptimizerBase(LogicalToPhysicalPlanConverter l2pConverter)

Method Details

optimize

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

Specified by:

optimize in interface PhysicalOptimizer

Throws:

PhysicalOptimizationException

keepMultiwayJoinsInInitialPhysicalPlan

protected abstract boolean keepMultiwayJoinsInInitialPhysicalPlan()

Return true if this optimizer expects that multiway joins are carried over from the given logical plan into the initial physical plan. The optimize(LogicalPlan) function passes this flag as the second argument of the LogicalToPhysicalPlanConverter.convert(LogicalPlan, boolean) function.

optimize

protected abstract Pair<PhysicalPlan,PhysicalOptimizationStats> optimize(PhysicalPlan initialPhysicalPlan)
                                                                  throws PhysicalOptimizationException

Throws:

PhysicalOptimizationException