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

Class RandomizedJoinPlanOptimizerImpl

java.lang.Object

se.liu.ida.hefquin.engine.queryproc.impl.poptimizer.simple.RandomizedJoinPlanOptimizerImpl

All Implemented Interfaces:

JoinPlanOptimizer

public class RandomizedJoinPlanOptimizerImpl
extends Object
implements JoinPlanOptimizer

Field Summary

Fields

Modifier and Type	Field	Description
protected final Random	random	The class contains a random seed object.

Constructor Summary

Constructors

Constructor	Description
RandomizedJoinPlanOptimizerImpl()

Method Summary

Modifier and Type	Method	Description
PhysicalPlan	determineJoinPlan(List<PhysicalPlan> subplans)	Returns a plan that combines the given subplans using binary joins.

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.impl.poptimizer.simple.JoinPlanOptimizer

determineJoinPlan

Field Details

random

protected final Random random

The class contains a random seed object.

Constructor Details

RandomizedJoinPlanOptimizerImpl

public RandomizedJoinPlanOptimizerImpl()

Method Details

determineJoinPlan

public PhysicalPlan determineJoinPlan(List<PhysicalPlan> subplans)
                               throws PhysicalOptimizationException

Description copied from interface: JoinPlanOptimizer

Returns a plan that combines the given subplans using binary joins.

Specified by:

determineJoinPlan in interface JoinPlanOptimizer

Throws:

PhysicalOptimizationException