Class EvaluationStatistics

java.lang.Object

org.eclipse.rdf4j.query.algebra.evaluation.impl.EvaluationStatistics

Direct Known Subclasses:

ExtensibleEvaluationStatistics, FederationEvaluationStatistics, TupleFunctionEvaluationStatistics

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	Description
protected static class	EvaluationStatistics.CardinalityCalculator
static final class	EvaluationStatistics.FilterPassEstimate

Constructor Summary

Constructors

Constructor	Description
EvaluationStatistics()

Method Summary

Modifier and Type	Method	Description
protected EvaluationStatistics.CardinalityCalculator	createCardinalityCalculator()
EvaluationStatistics.FilterPassEstimate	estimateFilterPass(Filter filter)
double	estimateFilterPassRatio(Filter filter)
double	getCardinality(TupleExpr expr)
void	recordFilterOutcome(Filter filter, long passedCount, long filteredCount)
boolean	supportsFilterSelectivityCosting()
boolean	supportsJoinEstimation()

Methods inherited from class Object

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

Constructor Details

EvaluationStatistics

public EvaluationStatistics()

Method Details

getCardinality

public double getCardinality(TupleExpr expr)

createCardinalityCalculator

protected EvaluationStatistics.CardinalityCalculator createCardinalityCalculator()

supportsJoinEstimation

public boolean supportsJoinEstimation()

supportsFilterSelectivityCosting

public boolean supportsFilterSelectivityCosting()

estimateFilterPassRatio

public double estimateFilterPassRatio(Filter filter)

estimateFilterPass

public EvaluationStatistics.FilterPassEstimate estimateFilterPass(Filter filter)

recordFilterOutcome

public void recordFilterOutcome(Filter filter,
 long passedCount,
 long filteredCount)