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

Class VarSpecificCardinalityEstimationImpl

java.lang.Object

se.liu.ida.hefquin.engine.queryproc.impl.poptimizer.cardinality.VarSpecificCardinalityEstimationImpl

All Implemented Interfaces:

VarSpecificCardinalityEstimation

public class VarSpecificCardinalityEstimationImpl
extends Object
implements VarSpecificCardinalityEstimation

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected static class	VarSpecificCardinalityEstimationImpl.MyCache

Field Summary

Fields

Modifier and Type	Field	Description
protected final VarSpecificCardinalityEstimationImpl.MyCache	cache
protected final CardinalityEstimation	cardEstimator

Constructor Summary

Constructors

Constructor	Description
VarSpecificCardinalityEstimationImpl(CardinalityEstimation cardEstimator)

Method Summary

Modifier and Type	Method	Description
protected CompletableFuture<Integer>	_initiateCardinalityEstimation(PhysicalPlan plan, org.apache.jena.sparql.core.Var v)
protected CompletableFuture<Integer>	_initiateJoinCardinalityEstimation(PhysicalPlan plan1, PhysicalPlan plan2, org.apache.jena.sparql.core.Var v)
protected CompletableFuture<Integer>	_initiateMultiwayUnionCardinalityEstimation(PhysicalPlan plan, org.apache.jena.sparql.core.Var v)
CompletableFuture<Integer>	initiateCardinalityEstimation(PhysicalPlan plan, org.apache.jena.sparql.core.Var v)	Asynchronous method that initiates a process to estimate the the variable-specific cardinality of the result that will be produced by the given plan.

Methods inherited from class java.lang.Object

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

Field Details

cache

protected final VarSpecificCardinalityEstimationImpl.MyCache cache

cardEstimator

protected final CardinalityEstimation cardEstimator

Constructor Details

VarSpecificCardinalityEstimationImpl

public VarSpecificCardinalityEstimationImpl(CardinalityEstimation cardEstimator)

Method Details

initiateCardinalityEstimation

public CompletableFuture<Integer> initiateCardinalityEstimation(PhysicalPlan plan,
 org.apache.jena.sparql.core.Var v)

Description copied from interface: VarSpecificCardinalityEstimation

Asynchronous method that initiates a process to estimate the the variable-specific cardinality of the result that will be produced by the given plan. The actual estimate can then be obtained by using the get() method of the returned CompletableFuture.

Specified by:

initiateCardinalityEstimation in interface VarSpecificCardinalityEstimation

_initiateCardinalityEstimation

protected CompletableFuture<Integer> _initiateCardinalityEstimation(PhysicalPlan plan,
 org.apache.jena.sparql.core.Var v)

_initiateJoinCardinalityEstimation

protected CompletableFuture<Integer> _initiateJoinCardinalityEstimation(PhysicalPlan plan1,
 PhysicalPlan plan2,
 org.apache.jena.sparql.core.Var v)

_initiateMultiwayUnionCardinalityEstimation

protected CompletableFuture<Integer> _initiateMultiwayUnionCardinalityEstimation(PhysicalPlan plan,
 org.apache.jena.sparql.core.Var v)