Class RuleBasedPhysicalOptimizerImpl

java.lang.Object

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

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

All Implemented Interfaces:

PhysicalOptimizer

public class RuleBasedPhysicalOptimizerImpl
extends PhysicalOptimizerBase

Field Summary

Fields

Modifier and Type	Field	Description
protected final List<RewritingRuleForPhysicalOptimization>	rewritingRules

Constructor Summary

Constructors

Constructor	Description
RuleBasedPhysicalOptimizerImpl(List<RewritingRuleForPhysicalOptimization> rewritingRules)

Method Summary

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

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

optimize

Methods inherited from class java.lang.Object

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

Field Details

rewritingRules

protected final List<RewritingRuleForPhysicalOptimization> rewritingRules

Constructor Details

RuleBasedPhysicalOptimizerImpl

public RuleBasedPhysicalOptimizerImpl(List<RewritingRuleForPhysicalOptimization> rewritingRules)

Method Details

optimize

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

Specified by:

optimize in class PhysicalOptimizerBase

Throws:

PhysicalOptimizationException

assumesLogicalMultiwayJoins

public boolean assumesLogicalMultiwayJoins()

keepMultiwayJoinsInInitialPhysicalPlan

protected boolean keepMultiwayJoinsInInitialPhysicalPlan()

Description copied from class: PhysicalOptimizerBase

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.

Specified by:

keepMultiwayJoinsInInitialPhysicalPlan in class PhysicalOptimizerBase