Interface VarSpecificCardinalityEstimation

All Known Implementing Classes:

VarSpecificCardinalityEstimationImpl

public interface VarSpecificCardinalityEstimation

Method Summary

Modifier and Type	Method	Description
CompletableFuture<Integer>	initiateCardinalityEstimation(PhysicalPlan plan, org.apache.jena.sparql.core.Var v, QueryProcContext ctx)	Asynchronous method that initiates a process to estimate the the variable-specific cardinality of the result that will be produced by the given plan.

Method Details

initiateCardinalityEstimation

CompletableFuture<Integer> initiateCardinalityEstimation(PhysicalPlan plan,
 org.apache.jena.sparql.core.Var v,
 QueryProcContext ctx)

Asynchronous method that initiates a process to estimate the the variable-specific cardinality of the result that will be produced by the given plan. The actual estimate can then be obtained by using the get() method of the returned CompletableFuture.