| /** |
| * Copyright 2011-2015 Quickstep Technologies LLC. |
| * Copyright 2015 Pivotal Software, Inc. |
| * |
| * 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_PHYSICAL_AGGREGATE_HPP_ |
| #define QUICKSTEP_QUERY_OPTIMIZER_PHYSICAL_AGGREGATE_HPP_ |
| |
| #include <memory> |
| #include <string> |
| #include <vector> |
| |
| #include "query_optimizer/OptimizerTree.hpp" |
| #include "query_optimizer/expressions/Alias.hpp" |
| #include "query_optimizer/expressions/AttributeReference.hpp" |
| #include "query_optimizer/expressions/ExpressionUtil.hpp" |
| #include "query_optimizer/expressions/NamedExpression.hpp" |
| #include "query_optimizer/expressions/Predicate.hpp" |
| #include "query_optimizer/physical/Physical.hpp" |
| #include "query_optimizer/physical/PhysicalType.hpp" |
| #include "utility/Macros.hpp" |
| |
| #include "glog/logging.h" |
| |
| namespace quickstep { |
| namespace optimizer { |
| namespace physical { |
| |
| /** \addtogroup OptimizerLogical |
| * @{ |
| */ |
| |
| class Aggregate; |
| typedef std::shared_ptr<const Aggregate> AggregatePtr; |
| |
| /** |
| * @brief Aggregate operator that computes aggregate expressions for each combination |
| * of the values of grouping expressions. |
| */ |
| class Aggregate : public Physical { |
| public: |
| PhysicalType getPhysicalType() const override { return PhysicalType::kAggregate; } |
| |
| std::string getName() const override { return "Aggregate"; } |
| |
| /** |
| * @return The input physical node. |
| */ |
| const PhysicalPtr input() const { return input_; } |
| |
| /** |
| * @return Grouping expressions. |
| */ |
| inline const std::vector<expressions::NamedExpressionPtr>& grouping_expressions() const { |
| return grouping_expressions_; |
| } |
| |
| /** |
| * @return Aggregate expressions. |
| */ |
| const std::vector<expressions::AliasPtr>& aggregate_expressions() const { |
| return aggregate_expressions_; |
| } |
| |
| /** |
| * @return Filter predicate applied before aggregation. |
| */ |
| const expressions::PredicatePtr& filter_predicate() const { |
| return filter_predicate_; |
| } |
| |
| PhysicalPtr copyWithNewChildren( |
| const std::vector<PhysicalPtr> &new_children) const override { |
| DCHECK_EQ(getNumChildren(), new_children.size()); |
| return Create(new_children[0], grouping_expressions_, aggregate_expressions_, filter_predicate_); |
| } |
| |
| std::vector<expressions::AttributeReferencePtr> getOutputAttributes() const override; |
| |
| std::vector<expressions::AttributeReferencePtr> getReferencedAttributes() const override; |
| |
| bool maybeCopyWithPrunedExpressions( |
| const expressions::UnorderedNamedExpressionSet &referenced_expressions, |
| PhysicalPtr *output) const override { |
| // The project expressions for an Aggregate cannot be changed. |
| return false; |
| } |
| |
| /** |
| * @brief Creates an Aggregate physical node. |
| * |
| * @param input The input node. |
| * @param aggregate_expressions The aggregate expressions. |
| * @param grouping_expressions The grouping expressions. |
| * @param filter_predicate The filtering predicate applied before aggregation. Can be NULL. |
| * @return An immutable Aggregate node. |
| */ |
| static AggregatePtr Create( |
| PhysicalPtr input, |
| const std::vector<expressions::NamedExpressionPtr> &grouping_expressions, |
| const std::vector<expressions::AliasPtr> &aggregate_expressions, |
| const expressions::PredicatePtr &filter_predicate) { |
| return AggregatePtr( |
| new Aggregate(input, grouping_expressions, aggregate_expressions, filter_predicate)); |
| } |
| |
| 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: |
| Aggregate( |
| PhysicalPtr input, |
| const std::vector<expressions::NamedExpressionPtr> &grouping_expressions, |
| const std::vector<expressions::AliasPtr> &aggregate_expressions, |
| const expressions::PredicatePtr &filter_predicate) |
| : input_(input), |
| grouping_expressions_(grouping_expressions), |
| aggregate_expressions_(aggregate_expressions), |
| filter_predicate_(filter_predicate) { |
| addChild(input_); |
| } |
| |
| PhysicalPtr input_; |
| std::vector<expressions::NamedExpressionPtr> grouping_expressions_; |
| std::vector<expressions::AliasPtr> aggregate_expressions_; |
| expressions::PredicatePtr filter_predicate_; |
| |
| DISALLOW_COPY_AND_ASSIGN(Aggregate); |
| }; |
| |
| /** @} */ |
| |
| } // namespace physical |
| } // namespace optimizer |
| } // namespace quickstep |
| |
| #endif /* QUICKSTEP_QUERY_OPTIMIZER_PHYSICAL_AGGREGATE_HPP_ */ |