| /** |
| * 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_EXPRESSIONS_CAST_HPP_ |
| #define QUICKSTEP_QUERY_OPTIMIZER_EXPRESSIONS_CAST_HPP_ |
| |
| #include <memory> |
| #include <string> |
| #include <unordered_map> |
| #include <vector> |
| |
| #include "query_optimizer/OptimizerTree.hpp" |
| #include "query_optimizer/expressions/AttributeReference.hpp" |
| #include "query_optimizer/expressions/ExprId.hpp" |
| #include "query_optimizer/expressions/Expression.hpp" |
| #include "query_optimizer/expressions/ExpressionType.hpp" |
| #include "query_optimizer/expressions/Scalar.hpp" |
| #include "utility/Macros.hpp" |
| |
| #include "glog/logging.h" |
| |
| namespace quickstep { |
| |
| class CatalogAttribute; |
| class Type; |
| |
| namespace optimizer { |
| namespace expressions { |
| |
| /** \addtogroup OptimizerExpressions |
| * @{ |
| */ |
| |
| class Cast; |
| typedef std::shared_ptr<const Cast> CastPtr; |
| |
| /** |
| * @brief Converts a value of a type to another type. |
| */ |
| class Cast : public Scalar { |
| public: |
| ExpressionType getExpressionType() const override { return ExpressionType::kCast; } |
| |
| std::string getName() const override { return "Cast"; } |
| |
| const Type& getValueType() const override { return target_type_; } |
| |
| bool isConstant() const override { return operand_->isConstant(); } |
| |
| /** |
| * @return The expression to be coerced. |
| */ |
| const ScalarPtr& operand() const { return operand_; } |
| |
| std::vector<AttributeReferencePtr> getReferencedAttributes() const override { |
| return operand_->getReferencedAttributes(); |
| } |
| |
| ExpressionPtr copyWithNewChildren( |
| const std::vector<ExpressionPtr> &new_children) const override; |
| |
| ::quickstep::Scalar* concretize( |
| const std::unordered_map<ExprId, const CatalogAttribute*> &substitution_map) const override; |
| |
| bool equals(const ScalarPtr &other) const override; |
| |
| /** |
| * @brief Creates a Cast expression that converts \p operand to \p target_type. |
| * |
| * @param operand The input expression to be coerced. |
| * @param target_type The target type that the expression is converted to. |
| * @return A Cast expression. |
| */ |
| static CastPtr Create(const ScalarPtr &operand, const Type &target_type) { |
| return CastPtr(new Cast(operand, target_type)); |
| } |
| |
| protected: |
| std::size_t computeHash() const override; |
| |
| void getFieldStringItems( |
| std::vector<std::string> *inline_field_names, |
| std::vector<std::string> *inline_field_values, |
| std::vector<std::string> *non_container_child_field_names, |
| std::vector<OptimizerTreeBaseNodePtr> *non_container_child_fields, |
| std::vector<std::string> *container_child_field_names, |
| std::vector<std::vector<OptimizerTreeBaseNodePtr>> *container_child_fields) const override; |
| |
| private: |
| Cast(const ScalarPtr &operand, const Type &target_type) |
| : operand_(operand), |
| target_type_(target_type) { |
| addChild(operand); |
| DCHECK(target_type.isCoercibleFrom(operand->getValueType())); |
| } |
| |
| const ScalarPtr operand_; |
| const Type &target_type_; |
| |
| DISALLOW_COPY_AND_ASSIGN(Cast); |
| }; |
| |
| /** @} */ |
| |
| } // namespace expressions |
| } // namespace optimizer |
| } // namespace quickstep |
| |
| #endif /* QUICKSTEP_QUERY_OPTIMIZER_EXPRESSIONS_CAST_HPP_ */ |