org.eclipse.rdf4j.sail.federation.optimizers

Class EvaluationStatistics

java.lang.Object

org.eclipse.rdf4j.sail.federation.optimizers.EvaluationStatistics

public class EvaluationStatistics
extends Object

Supplies various query model statistics to the query engine/optimizer.

Author:

Arjohn Kampman, James Leigh

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	EvaluationStatistics.CardinalityCalculator

Field Summary

Fields

Modifier and Type	Field and Description
protected EvaluationStatistics.CardinalityCalculator	calculator

Constructor Summary

Constructors

Constructor and Description
EvaluationStatistics()

Method Summary

Modifier and Type	Method and Description
protected EvaluationStatistics.CardinalityCalculator	createCardinalityCalculator()
double	getCardinality(TupleExpr expr)

Methods inherited from class java.lang.Object

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

Field Detail

calculator

protected EvaluationStatistics.CardinalityCalculator calculator

Constructor Detail

EvaluationStatistics

public EvaluationStatistics()

Method Detail

getCardinality

public double getCardinality(TupleExpr expr)

createCardinalityCalculator

protected EvaluationStatistics.CardinalityCalculator createCardinalityCalculator()