Package org.eclipse.rdf4j.federated.optimizer

Interface Summary

Interface	Description
FedXCostModel	Interface for a cost model used in StatementGroupAndJoinOptimizer.
FedXOptimizer	Interface for any FedX optimizer

Class Summary

Class	Description
DefaultFedXCostModel	Default implementation of the FedXCostModel
ExclusiveTupleExprOptimizer	A specialized optimizer which identifies and marks ExclusiveTupleExpr.
FilterOptimizer	Filter optimizer to push down FILTER expressions as far as possible.
FilterOptimizer.FilterExprInsertVisitor
FilterOptimizer.VarFinder
GenericInfoOptimizer	Generic optimizer Tasks: - Collect information (hasUnion, hasFilter, hasService) - Collect all statements in a list (for source selection), do not collect SERVICE expressions - Collect all Join arguments and group them in the NJoin structure for easier optimization (flatten)
LimitOptimizer	An optimizer that attempts to push upper limits into BGPs of the query.
NaryJoinArgumentsComparator	Comparator: partial order: OwnedStatementSourcePatternGroup -> OwnedStatementSourcePattern -> StatementSourcePattern
OptimizerUtil
ServiceOptimizer	Optimizer for SERVICE nodes.
SourceSelection	Perform source selection during optimization
SourceSelection.ParallelCheckTask	Task for sending an ASK request to the endpoints (for source selection)
SourceSelection.SourceSelectionExecutorWithLatch
StatementGroupAndJoinOptimizer	Optimizer with the following tasks: 1.
UnionOptimizer	Optimizer to flatten the UNION operations.