| /** |
| * 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_OPTIMIZER_CONTEXT_HPP_ |
| #define QUICKSTEP_QUERY_OPTIMIZER_OPTIMIZER_CONTEXT_HPP_ |
| |
| #include "query_optimizer/expressions/ExprId.hpp" |
| #include "utility/Macros.hpp" |
| |
| namespace quickstep { |
| |
| namespace optimizer { |
| |
| /** \addtogroup QueryOptimizer |
| * @{ |
| */ |
| |
| /** |
| * @brief Stores stateful or common info used throughout the optimization of a |
| * query. |
| */ |
| class OptimizerContext { |
| public: |
| static const char *kInternalTemporaryRelationNamePrefix; |
| |
| /** |
| * @brief Constructor. |
| */ |
| OptimizerContext() |
| : current_expr_id_(-1), |
| has_nested_queries_(false), |
| is_catalog_changed_(false) {} |
| |
| /** |
| * @brief Destructor. |
| */ |
| ~OptimizerContext() {} |
| |
| /** |
| * @brief Gets the next ExprId. |
| * |
| * @return A new ExprId. |
| */ |
| expressions::ExprId nextExprId() { |
| return ++current_expr_id_; |
| } |
| |
| /** |
| * @brief Indicate that the query has a nested subquery. |
| */ |
| void set_has_nested_queries() { |
| has_nested_queries_ = true; |
| } |
| |
| /** |
| * @return True if the query has a nested subquery. |
| */ |
| bool has_nested_queries() const { |
| return has_nested_queries_; |
| } |
| |
| /** |
| * @brief Sets <is_catalog_changed_> to be true to indicate the query will |
| * modify the catalog permanently. |
| */ |
| void set_is_catalog_changed() { is_catalog_changed_ = true; } |
| |
| /** |
| * @return True if the catalog will be permanently changed after the query. |
| */ |
| bool is_catalog_changed() const { return is_catalog_changed_; } |
| |
| private: |
| expressions::ExprId current_expr_id_; |
| |
| bool has_nested_queries_; |
| |
| bool is_catalog_changed_; |
| |
| DISALLOW_COPY_AND_ASSIGN(OptimizerContext); |
| }; |
| |
| /** @} */ |
| |
| } // namespace optimizer |
| } // namespace quickstep |
| |
| #endif /* QUICKSTEP_QUERY_OPTIMIZER_OPTIMIZER_CONTEXT_HPP_ */ |