| /** |
| * 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_EXPRESSIONS_AGGREGATION_AGGREGATION_HANDLE_COUNT_HPP_ |
| #define QUICKSTEP_EXPRESSIONS_AGGREGATION_AGGREGATION_HANDLE_COUNT_HPP_ |
| |
| #include <atomic> |
| #include <cstddef> |
| #include <cstdint> |
| #include <memory> |
| #include <vector> |
| |
| #include "catalog/CatalogTypedefs.hpp" |
| #include "expressions/aggregation/AggregationHandle.hpp" |
| #include "storage/HashTableBase.hpp" |
| #include "types/TypedValue.hpp" |
| #include "utility/Macros.hpp" |
| |
| namespace quickstep { |
| |
| class ColumnVector; |
| class StorageManager; |
| class Type; |
| class ValueAccessor; |
| |
| template <bool, bool> class AggregationHandleCount; |
| |
| /** \addtogroup Expressions |
| * @{ |
| */ |
| |
| /** |
| * @brief Aggregation state of count. |
| */ |
| class AggregationStateCount : public AggregationState { |
| public: |
| /** |
| * @brief Copy constructor. |
| */ |
| AggregationStateCount(const AggregationStateCount &state) |
| : count_(state.count_.load(std::memory_order_relaxed)) {} |
| |
| /** |
| * @brief Destructor. |
| */ |
| ~AggregationStateCount() override {} |
| |
| private: |
| friend class AggregationHandleCount<false, false>; |
| friend class AggregationHandleCount<false, true>; |
| friend class AggregationHandleCount<true, false>; |
| friend class AggregationHandleCount<true, true>; |
| |
| AggregationStateCount() |
| : count_(0) { |
| } |
| |
| explicit AggregationStateCount(const std::int64_t initial_count) |
| : count_(initial_count) { |
| } |
| |
| std::atomic<std::int64_t> count_; |
| }; |
| |
| /** |
| * @brief An aggregationhandle for count. |
| * |
| * @param count_star If true, this AggregationHandleCount is for nullary |
| * COUNT(*). If false, it is a COUNT over some scalar expression. |
| * @param nullable_type If true, the argument to COUNT() is nullable, and NULL |
| * values should not be included in the count. If false, the argument is |
| * not nullable and NULL-checks can safely be skipped. |
| **/ |
| template <bool count_star, bool nullable_type> |
| class AggregationHandleCount : public AggregationHandle { |
| public: |
| ~AggregationHandleCount() override { |
| } |
| |
| AggregationState* createInitialState() const override { |
| return new AggregationStateCount(); |
| } |
| |
| AggregationStateHashTableBase* createGroupByHashTable( |
| const HashTableImplType hash_table_impl, |
| const std::vector<const Type*> &group_by_types, |
| const std::size_t estimated_num_groups, |
| StorageManager *storage_manager) const override; |
| |
| inline void iterateNullaryInl(AggregationStateCount *state) const { |
| state->count_.fetch_add(1, std::memory_order_relaxed); |
| } |
| |
| /** |
| * @brief Iterate with count aggregation state. |
| */ |
| inline void iterateUnaryInl(AggregationStateCount *state, const TypedValue &value) const { |
| if ((!nullable_type) || (!value.isNull())) { |
| state->count_.fetch_add(1, std::memory_order_relaxed); |
| } |
| } |
| |
| AggregationState* accumulateNullary(const std::size_t num_tuples) const override { |
| return new AggregationStateCount(num_tuples); |
| } |
| |
| AggregationState* accumulateColumnVectors( |
| const std::vector<std::unique_ptr<ColumnVector>> &column_vectors) const override; |
| |
| #ifdef QUICKSTEP_ENABLE_VECTOR_COPY_ELISION_SELECTION |
| AggregationState* accumulateValueAccessor( |
| ValueAccessor *accessor, |
| const std::vector<attribute_id> &accessor_id) const override; |
| #endif |
| |
| void aggregateValueAccessorIntoHashTable( |
| ValueAccessor *accessor, |
| const std::vector<attribute_id> &argument_ids, |
| const std::vector<attribute_id> &group_by_key_ids, |
| AggregationStateHashTableBase *hash_table) const override; |
| |
| void mergeStates(const AggregationState &source, |
| AggregationState *destination) const override; |
| |
| TypedValue finalize(const AggregationState &state) const override { |
| return TypedValue(static_cast<const AggregationStateCount&>(state).count_.load(std::memory_order_relaxed)); |
| } |
| |
| inline TypedValue finalizeHashTableEntry(const AggregationState &state) const { |
| return TypedValue(static_cast<const AggregationStateCount&>(state).count_.load(std::memory_order_relaxed)); |
| } |
| |
| ColumnVector* finalizeHashTable( |
| const AggregationStateHashTableBase &hash_table, |
| std::vector<std::vector<TypedValue>> *group_by_keys) const override; |
| |
| private: |
| friend class AggregateFunctionCount; |
| |
| /** |
| * @brief Constructor. |
| **/ |
| AggregationHandleCount() { |
| } |
| |
| DISALLOW_COPY_AND_ASSIGN(AggregationHandleCount); |
| }; |
| |
| /** @} */ |
| |
| } // namespace quickstep |
| |
| #endif // QUICKSTEP_EXPRESSIONS_AGGREGATION_AGGREGATION_HANDLE_COUNT__ |