Class FilterOptimizer
java.lang.Object
org.eclipse.rdf4j.query.algebra.helpers.AbstractSimpleQueryModelVisitor<OptimizationException>
org.eclipse.rdf4j.federated.optimizer.FilterOptimizer
- All Implemented Interfaces:
FedXOptimizer,QueryModelVisitor<OptimizationException>
public class FilterOptimizer
extends AbstractSimpleQueryModelVisitor<OptimizationException>
implements FedXOptimizer
Filter optimizer to push down FILTER expressions as far as possible.
- Author:
- Andreas Schwarte
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Nested Class Summary
Nested ClassesModifier and TypeClassDescriptionprotected static classprotected static classprotected static class -
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionprotected voidgetConjunctiveExpressions(ValueExpr expr, List<ValueExpr> conjExpr) add the conjunctive expressions to specified list, has recursive step.protected booleanreturns true if this filter can be used for optimization.voidvoidvoidOptimize the provided tuple expressionMethods inherited from class org.eclipse.rdf4j.query.algebra.helpers.AbstractSimpleQueryModelVisitor
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Constructor Details
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FilterOptimizer
public FilterOptimizer()
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Method Details
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optimize
Description copied from interface:FedXOptimizerOptimize the provided tuple expression- Specified by:
optimizein interfaceFedXOptimizer
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meet
- Specified by:
meetin interfaceQueryModelVisitor<OptimizationException>- Overrides:
meetin classAbstractSimpleQueryModelVisitor<OptimizationException>
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meet
- Specified by:
meetin interfaceQueryModelVisitor<OptimizationException>- Overrides:
meetin classAbstractSimpleQueryModelVisitor<OptimizationException>- Throws:
OptimizationException
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getConjunctiveExpressions
add the conjunctive expressions to specified list, has recursive step.- Parameters:
expr- the expr, in the best case in CNFconjExpr- the list to which expressions will be added
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isCompatibleExpr
returns true if this filter can be used for optimization. Currently no conjunctive or disjunctive expressions are supported.- Parameters:
e-- Returns:
- whether the expression is compatible
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