Class QueryJoinOptimizer
- java.lang.Object
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- org.eclipse.rdf4j.query.algebra.evaluation.impl.QueryJoinOptimizer
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- All Implemented Interfaces:
QueryOptimizer
public class QueryJoinOptimizer extends Object implements QueryOptimizer
A query optimizer that re-orders nested Joins.- Author:
- Arjohn Kampman, James Leigh
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Nested Class Summary
Nested Classes Modifier and Type Class Description protected class
QueryJoinOptimizer.JoinVisitor
Deprecated.This class is protected for historic reasons only, and will be made private in a future major release.
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Field Summary
Fields Modifier and Type Field Description protected EvaluationStatistics
statistics
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Constructor Summary
Constructors Constructor Description QueryJoinOptimizer()
QueryJoinOptimizer(EvaluationStatistics statistics)
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Method Summary
All Methods Instance Methods Concrete Methods 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.
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Field Detail
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statistics
protected final EvaluationStatistics statistics
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Constructor Detail
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QueryJoinOptimizer
public QueryJoinOptimizer()
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QueryJoinOptimizer
public QueryJoinOptimizer(EvaluationStatistics statistics)
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Method Detail
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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 interfaceQueryOptimizer
- Parameters:
tupleExpr
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