Package se.liu.ida.hefquin.engine.queryproc.impl.poptimizer.costmodel

Interface CostFunctionForPlan

All Known Implementing Classes:
CFRBasedCostFunctionForPlan, CFRBasedParallelismCostFunctionForPlan
public interface CostFunctionForPlan
Implementations of this interface represent functions that determine some form of cost value for any given (physical) query plan.

  • Method Details

    • initiateCostEstimation

      CompletableFuture<Integer> initiateCostEstimation(Set<PhysicalPlan> visitedPlans, PhysicalPlan plan)
      A function for estimating the cost of a plan.
      Parameters:
      visitedPlans - : Record a set of sub-plans (of plan) that have been visited during the cost estimation. This set can be used for checking if a subplan has been visited or not.