| /** |
| * 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_MULTIWAY_CARTESIAN_JOIN_HPP_ |
| #define QUICKSTEP_QUERY_OPTIMIZER_MULTIWAY_CARTESIAN_JOIN_HPP_ |
| |
| #include <memory> |
| #include <string> |
| #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 "query_optimizer/logical/Join.hpp" |
| #include "utility/Macros.hpp" |
| |
| #include "glog/logging.h" |
| |
| namespace quickstep { |
| namespace optimizer { |
| namespace logical { |
| |
| /** \addtogroup OptimizerLogical |
| * @{ |
| */ |
| |
| class MultiwayCartesianJoin; |
| typedef std::shared_ptr<const MultiwayCartesianJoin> MultiwayCartesianJoinPtr; |
| |
| /** |
| * @brief Produces cartesian product of all input relations. This is used in the |
| * initial and intermediate logical plan only, and is replaced by other |
| * join operators in the final logical plan. |
| */ |
| class MultiwayCartesianJoin : public Join { |
| public: |
| LogicalType getLogicalType() const override { |
| return LogicalType::kMultiwayCartesianJoin; |
| } |
| |
| std::string getName() const override { return "MultiwayCartesianJoin"; } |
| |
| /** |
| * @return The input operators. |
| */ |
| const std::vector<LogicalPtr>& operands() const { return operands_; } |
| |
| LogicalPtr copyWithNewChildren( |
| const std::vector<LogicalPtr> &new_children) const override; |
| |
| std::vector<expressions::AttributeReferencePtr> getOutputAttributes() const override; |
| |
| std::vector<expressions::AttributeReferencePtr> getReferencedAttributes() const override { |
| return {}; |
| } |
| |
| /** |
| * @brief Creates a MultiwayCartesianJoin with \p operands as input operators. |
| * |
| * @param operands Input operators. |
| * @return An immutable MultiwayCartesianJoin. |
| */ |
| static MultiwayCartesianJoinPtr Create( |
| const std::vector<LogicalPtr> &operands) { |
| DCHECK_GT(operands.size(), 1u); |
| return MultiwayCartesianJoinPtr(new MultiwayCartesianJoin(operands)); |
| } |
| |
| 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; |
| |
| private: |
| explicit MultiwayCartesianJoin(const std::vector<LogicalPtr> &operands) |
| : operands_(operands) { |
| for (const LogicalPtr &operand : operands) { |
| addChild(operand); |
| } |
| } |
| std::vector<LogicalPtr> operands_; |
| |
| DISALLOW_COPY_AND_ASSIGN(MultiwayCartesianJoin); |
| }; |
| |
| /** @} */ |
| |
| } // namespace logical |
| } // namespace optimizer |
| } // namespace quickstep |
| |
| #endif /* QUICKSTEP_QUERY_OPTIMIZER_MULTIWAY_CARTESIAN_JOIN_HPP_ */ |