org.eclipse.rdf4j.federated.optimizer

Interface FedXCostModel

All Known Implementing Classes:

DefaultFedXCostModel

public interface FedXCostModel

Interface for a cost model used in StatementGroupAndJoinOptimizer.

Author:

Andreas Schwarte

Method Summary

Modifier and Type	Method and Description
double	estimateCost(TupleExpr tupleExpr, Set<String> joinVars) Return the estimated cost for the given TupleExpr

Method Detail

estimateCost

double estimateCost(TupleExpr tupleExpr,
                    Set<String> joinVars)

Return the estimated cost for the given TupleExpr

Parameters:

tupleExpr -

joinVars -

Returns:

the cost associated to the tupleExpr