| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| **/ |
| |
| #ifndef QUICKSTEP_QUERY_OPTIMIZER_STRATEGY_SELECTION_HPP_ |
| #define QUICKSTEP_QUERY_OPTIMIZER_STRATEGY_SELECTION_HPP_ |
| |
| #include <string> |
| #include <vector> |
| |
| #include "query_optimizer/expressions/Predicate.hpp" |
| #include "query_optimizer/expressions/NamedExpression.hpp" |
| #include "query_optimizer/logical/Logical.hpp" |
| #include "query_optimizer/physical/Physical.hpp" |
| #include "query_optimizer/strategy/Strategy.hpp" |
| #include "utility/Macros.hpp" |
| |
| namespace quickstep { |
| namespace optimizer { |
| |
| class LogicalToPhysicalMapper; |
| |
| namespace strategy { |
| |
| /** \addtogroup OptimizerStrategy |
| * @{ |
| */ |
| |
| /** |
| * @brief Strategy to create a Selection plan. |
| * It converts logical project, filter or project-filter to |
| * a physical Selection. |
| */ |
| class Selection : public Strategy { |
| public: |
| /** |
| * @brief Constructor. |
| * |
| * @param physical_mapper The physical plan generator used to get child |
| * physical plans. |
| */ |
| explicit Selection(LogicalToPhysicalMapper *physical_mapper) |
| : Strategy(physical_mapper) {} |
| |
| std::string getName() const override { return "Selection"; } |
| |
| bool generatePlan(const logical::LogicalPtr &logical_input, |
| physical::PhysicalPtr *physical_output) override; |
| |
| private: |
| /** |
| * @brief Returns in \p physical_output a physical plan rooted by a Selection. |
| * |
| * @param logical_input The logical input to the Selection. |
| * @param filter_predicate The filter predicate that should be included |
| * in the physical Selection. The predicate in |
| * the returned Selection may have additional |
| * predicates in the logical input. |
| * @param project_expressions The project expressions for the physical |
| * Selection. The expressions in the |
| * returned Selection may change. |
| * @param physical_output A physical plan with a Selection as the root. |
| */ |
| void addSelection( |
| const logical::LogicalPtr &logical_input, |
| const expressions::PredicatePtr &filter_predicate, |
| const std::vector<expressions::NamedExpressionPtr> &project_expressions, |
| physical::PhysicalPtr *physical_output); |
| |
| DISALLOW_COPY_AND_ASSIGN(Selection); |
| }; |
| |
| /** @} */ |
| |
| } // namespace strategy |
| } // namespace optimizer |
| } // namespace quickstep |
| |
| #endif /* QUICKSTEP_QUERY_OPTIMIZER_STRATEGY_SELECTION_HPP_ */ |