| /** |
| * 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_RULES_UPDATE_EXPRESSION_HPP_ |
| #define QUICKSTEP_QUERY_OPTIMIZER_RULES_UPDATE_EXPRESSION_HPP_ |
| |
| #include <string> |
| #include <unordered_map> |
| |
| #include "query_optimizer/expressions/Expression.hpp" |
| #include "query_optimizer/expressions/ExprId.hpp" |
| #include "query_optimizer/rules/BottomUpRule.hpp" |
| #include "utility/Macros.hpp" |
| |
| namespace quickstep { |
| namespace optimizer { |
| |
| /** \addtogroup OptimizerRules |
| * @{ |
| */ |
| |
| /** |
| * @brief Performs a bottom-up traverse on an expression tree and replaces named |
| * expressions with new expressions based on a substitution map. |
| */ |
| class UpdateExpression : public BottomUpRule<expressions::Expression> { |
| public: |
| /** |
| * @brief Constructor. |
| * |
| * @param substitution_map Map from an ExprId of the named expression to |
| * replace with an expression to be replaced with. |
| */ |
| explicit UpdateExpression( |
| const std::unordered_map<expressions::ExprId, expressions::ExpressionPtr> &substitution_map) |
| : substitution_map_(substitution_map) {} |
| |
| std::string getName() const override { return "UpdateExpressions"; } |
| |
| protected: |
| expressions::ExpressionPtr applyToNode(const expressions::ExpressionPtr &input) override; |
| |
| private: |
| const std::unordered_map<expressions::ExprId, expressions::ExpressionPtr> &substitution_map_; |
| |
| DISALLOW_COPY_AND_ASSIGN(UpdateExpression); |
| }; |
| |
| /** @} */ |
| |
| } // namespace optimizer |
| } // namespace quickstep |
| |
| #endif /* QUICKSTEP_QUERY_OPTIMIZER_RULES_UPDATE_EXPRESSION_HPP_ */ |