| /** |
| * 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_LOGICAL_SET_OPERATION_HPP_ |
| #define QUICKSTEP_QUERY_OPTIMIZER_LOGICAL_SET_OPERATION_HPP_ |
| |
| #include <memory> |
| #include <string> |
| #include <type_traits> |
| #include <vector> |
| |
| #include "query_optimizer/OptimizerTree.hpp" |
| #include "query_optimizer/expressions/AttributeReference.hpp" |
| #include "query_optimizer/logical/Logical.hpp" |
| #include "query_optimizer/logical/LogicalType.hpp" |
| #include "utility/Cast.hpp" |
| #include "utility/Macros.hpp" |
| |
| #include "glog/logging.h" |
| |
| namespace quickstep { |
| namespace optimizer { |
| namespace logical { |
| |
| /** \addtogroup OptimizerLogical |
| * @{ |
| */ |
| |
| class SetOperation; |
| typedef std::shared_ptr<const SetOperation> SetOperationPtr; |
| |
| /** |
| * @brief Base class for logical set operation operator that combines tuples |
| * from two or more relations. |
| */ |
| class SetOperation : public Logical { |
| public: |
| enum SetOperationType { |
| kIntersect = 0, |
| kUnion, |
| kUnionAll |
| }; |
| |
| /** |
| * @brief Destructor. |
| */ |
| ~SetOperation() override {} |
| |
| LogicalType getLogicalType() const override { |
| return LogicalType::kSetOperation; |
| } |
| |
| std::string getName() const override { |
| switch (set_operation_type_) { |
| case SetOperationType::kIntersect: |
| return "Intersect"; |
| case SetOperationType::kUnion: |
| return "Union"; |
| case SetOperationType::kUnionAll: |
| return "UnionAll"; |
| default: |
| LOG(FATAL) << "Invalid set operation type: " |
| << static_cast<typename std::underlying_type<SetOperationType>::type>(set_operation_type_); |
| } |
| } |
| |
| /** |
| * @return The set operation type |
| */ |
| SetOperationType getSetOperationType() const { |
| return set_operation_type_; |
| } |
| |
| /** |
| * @return The operands for set operation. |
| */ |
| const std::vector<LogicalPtr>& getOperands() const { |
| return operands_; |
| } |
| |
| std::vector<expressions::AttributeReferencePtr> getOutputAttributes() const override { |
| return project_attributes_; |
| } |
| |
| std::vector<expressions::AttributeReferencePtr> getReferencedAttributes() const override { |
| std::vector<expressions::AttributeReferencePtr> referenced_attributes; |
| for (const auto &operand : operands_) { |
| const std::vector<expressions::AttributeReferencePtr> reference = |
| operand->getOutputAttributes(); |
| referenced_attributes.insert(referenced_attributes.end(), |
| reference.begin(), |
| reference.end()); |
| } |
| return referenced_attributes; |
| } |
| |
| LogicalPtr copyWithNewChildren( |
| const std::vector<LogicalPtr> &new_children) const override { |
| DCHECK_EQ(new_children.size(), children().size()); |
| return SetOperation::Create(set_operation_type_, new_children, project_attributes_); |
| } |
| |
| /** |
| * @brief Create a logical set operation operator that combines two or more |
| * relations. |
| * |
| * @param type The type of set operation. |
| * @param operands The operands of the set operation. |
| * @param project_attributes The project attributes of this set operation. |
| */ |
| static SetOperationPtr Create( |
| const SetOperationType type, |
| const std::vector<LogicalPtr> &operands, |
| const std::vector<expressions::AttributeReferencePtr> &project_attributes) { |
| DCHECK_GT(operands.size(), 1u); |
| return SetOperationPtr(new SetOperation(type, operands, project_attributes)); |
| } |
| |
| protected: |
| 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 { |
| inline_field_names->push_back("set_operation_type"); |
| inline_field_values->push_back(getName()); |
| |
| container_child_field_names->push_back("operands"); |
| container_child_fields->push_back( |
| CastSharedPtrVector<OptimizerTreeBase>(operands_)); |
| |
| container_child_field_names->push_back("project_attributes"); |
| container_child_fields->push_back( |
| CastSharedPtrVector<OptimizerTreeBase>(project_attributes_)); |
| } |
| |
| private: |
| /** |
| * @brief Constructor. |
| */ |
| SetOperation(const SetOperationType set_operation_type, |
| const std::vector<LogicalPtr> &operands, |
| const std::vector<expressions::AttributeReferencePtr> &project_attributes) |
| : set_operation_type_(set_operation_type), |
| operands_(operands), |
| project_attributes_(project_attributes) { |
| for (const LogicalPtr &operand : operands) { |
| addChild(operand); |
| } |
| } |
| |
| const SetOperationType set_operation_type_; |
| const std::vector<LogicalPtr> operands_; |
| const std::vector<expressions::AttributeReferencePtr> project_attributes_; |
| |
| DISALLOW_COPY_AND_ASSIGN(SetOperation); |
| }; |
| |
| /** @} */ |
| |
| } // namespace logical |
| } // namespace optimizer |
| } // namespace quickstep |
| |
| #endif // QUICKSTEP_QUERY_OPTIMIZER_LOGICAL_SET_OPERATION_HPP_ |