| /** |
| * Copyright 2011-2015 Quickstep Technologies LLC. |
| * Copyright 2015 Pivotal Software, Inc. |
| * Copyright 2016, Quickstep Research Group, Computer Sciences Department, |
| * University of Wisconsin—Madison. |
| * |
| * Licensed 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_LOGICAL_LOGICAL_HPP_ |
| #define QUICKSTEP_QUERY_OPTIMIZER_LOGICAL_LOGICAL_HPP_ |
| |
| #include <memory> |
| #include <vector> |
| |
| #include "query_optimizer/OptimizerTree.hpp" |
| #include "query_optimizer/expressions/AttributeReference.hpp" |
| #include "query_optimizer/expressions/Expression.hpp" |
| #include "query_optimizer/logical/LogicalType.hpp" |
| #include "utility/Macros.hpp" |
| |
| #include "glog/logging.h" |
| |
| namespace quickstep { |
| namespace optimizer { |
| namespace logical { |
| |
| /** \addtogroup OptimizerLogical |
| * @{ |
| */ |
| |
| class Logical; |
| typedef std::shared_ptr<const Logical> LogicalPtr; |
| |
| /** |
| * @brief Base class for all logical operator/node. |
| */ |
| class Logical : public OptimizerTree<Logical>, |
| public std::enable_shared_from_this<const Logical> { |
| public: |
| /** |
| * @brief Destructor. |
| */ |
| ~Logical() {} |
| |
| /** |
| * @return The type of this logical operator. |
| */ |
| virtual LogicalType getLogicalType() const = 0; |
| |
| /** |
| * @return The references to the output attributes produced by this logical |
| * operator. |
| */ |
| virtual std::vector<expressions::AttributeReferencePtr> getOutputAttributes() const = 0; |
| |
| /** |
| * @return The references to the input attributes used in this logical |
| * operator. |
| */ |
| virtual std::vector<expressions::AttributeReferencePtr> getReferencedAttributes() const = 0; |
| |
| /** |
| * @brief Make a copy of this logical node with input expressions replaced by |
| * input_expression. |
| * |
| * @return A copy of this logical node with the new input expressions. |
| */ |
| virtual LogicalPtr copyWithNewInputExpressions( |
| const std::vector<expressions::ExpressionPtr> &input_expressions) const { |
| // Default implementation: return a shared reference to "this" when there is |
| // no change. |
| DCHECK(input_expressions.empty()); |
| return shared_from_this(); |
| } |
| |
| /** |
| * @return The input expressions in this Logical. |
| */ |
| const std::vector<expressions::ExpressionPtr>& input_expressions() const { |
| return input_expressions_; |
| } |
| |
| /** |
| * @return The input attributes, which are the union set of the output attributes of |
| * all children. |
| */ |
| std::vector<expressions::AttributeReferencePtr> getInputAttributes() const { |
| std::vector<expressions::AttributeReferencePtr> input_attributes; |
| for (const LogicalPtr &child : children()) { |
| const std::vector<expressions::AttributeReferencePtr> child_output_attributes = |
| child->getOutputAttributes(); |
| input_attributes.insert(input_attributes.end(), |
| child_output_attributes.begin(), |
| child_output_attributes.end()); |
| } |
| return input_attributes; |
| } |
| |
| protected: |
| /** |
| * @brief Constructor. |
| */ |
| Logical() {} |
| |
| template <class ExpressionClass> |
| void addInputExpressions(const std::vector<ExpressionClass> &new_input_expressions) { |
| input_expressions_.insert(input_expressions_.end(), |
| new_input_expressions.begin(), |
| new_input_expressions.end()); |
| } |
| |
| void addInputExpression(const expressions::ExpressionPtr &new_input_expression) { |
| input_expressions_.emplace_back(new_input_expression); |
| } |
| |
| std::vector<expressions::ExpressionPtr> input_expressions_; |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(Logical); |
| }; |
| |
| /** @} */ |
| |
| } // namespace logical |
| } // namespace optimizer |
| } // namespace quickstep |
| |
| #endif /* QUICKSTEP_QUERY_OPTIMIZER_LOGICAL_LOGICAL_HPP_ */ |