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

Constructor Summary

Constructors

Constructor	Description
PhysicalOptimizerBase()

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, QueryProcContext ctxt)
protected abstract Pair<PhysicalPlan,PhysicalOptimizationStats>	optimize(PhysicalPlan initialPhysicalPlan, QueryProcContext ctxt)

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

Constructor Details

PhysicalOptimizerBase

public PhysicalOptimizerBase()

Method Details

optimize

public final Pair<PhysicalPlan,PhysicalOptimizationStats> optimize(LogicalPlan lp,
 QueryProcContext ctxt)
                                                            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

invalid reference

#optimize(LogicalPlan)

function passes this flag as the second argument of the

invalid reference

LogicalToPhysicalPlanConverter#convert(LogicalPlan, boolean)

function.

optimize

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

Throws:

PhysicalOptimizationException