CostFunctionCout.hpp

Go to the documentation of this file.

#pragma once
 
#include <mutable/catalog/CardinalityEstimator.hpp>
#include <mutable/catalog/CostFunction.hpp>
#include <mutable/IR/PlanTable.hpp>
 
 
namespace m {
 
struct CostFunctionCout : CostFunctionCRTP<CostFunctionCout>
{
    template<typename PlanTable>
    double operator()(calculate_filter_cost_tag, const PlanTable &PT, const QueryGraph &G,
                      const CardinalityEstimator &CE, Subproblem sub, const cnf::CNF &condition) const
    {
        return double(CE.predict_cardinality(*PT[sub].model)) + PT[sub].cost;
    }
 
    template<typename PlanTable>
    double operator()(calculate_join_cost_tag, const PlanTable &PT, const QueryGraph &G, const CardinalityEstimator &CE,
                      Subproblem left, Subproblem right, const cnf::CNF &condition) const
    {
        return /* |T| =        */ double(CE.predict_cardinality(*PT[left|right].model)) +
               /* C_out(T_1) = */ PT[left].cost +
               /* C_out(T_2) = */ PT[right].cost;
    }
 
    template<typename PlanTable>
    double operator()(calculate_grouping_cost_tag, const PlanTable &PT, const QueryGraph &G,
                      const CardinalityEstimator &CE, Subproblem sub,
                      const std::vector<const ast::Expr*> &group_by) const
    {
        return double(CE.predict_cardinality(*PT[sub].model)) + PT[sub].cost;
    }
};
 
}