Package org.eclipse.rdf4j.query.algebra.evaluation.optimizer

Class QueryJoinOptimizer

java.lang.Object

org.eclipse.rdf4j.query.algebra.evaluation.optimizer.QueryJoinOptimizer

All Implemented Interfaces:

QueryOptimizer

Direct Known Subclasses:

QueryJoinOptimizer

public class QueryJoinOptimizer
extends Object
implements QueryOptimizer

A query optimizer that re-orders nested Joins.

Author:

Arjohn Kampman, James Leigh

Field Summary

Fields

Modifier and Type	Field	Description
protected EvaluationStatistics	statistics

Constructor Summary

Constructors

Constructor	Description
QueryJoinOptimizer(EvaluationStatistics statistics)
QueryJoinOptimizer(EvaluationStatistics statistics, boolean trackResultSize)

Method Summary

Modifier and Type	Method	Description
void	optimize(TupleExpr tupleExpr, Dataset dataset, BindingSet bindings)	Applies generally applicable optimizations: path expressions are sorted from more to less specific.

Methods inherited from class java.lang.Object

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

Field Detail

statistics

protected final EvaluationStatistics statistics

Constructor Detail

QueryJoinOptimizer

public QueryJoinOptimizer(EvaluationStatistics statistics)

QueryJoinOptimizer

public QueryJoinOptimizer(EvaluationStatistics statistics,
                          boolean trackResultSize)

Method Detail

optimize

public void optimize(TupleExpr tupleExpr,
                     Dataset dataset,
                     BindingSet bindings)

Applies generally applicable optimizations: path expressions are sorted from more to less specific.

Specified by:

optimize in interface QueryOptimizer

Parameters:

tupleExpr -