| /** |
| * 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_EXPRESSIONS_AGGREGATION_AGGREGATION_HANDLE_COUNT_HPP_ |
| #define QUICKSTEP_EXPRESSIONS_AGGREGATION_AGGREGATION_HANDLE_COUNT_HPP_ |
| |
| #include <atomic> |
| #include <cstddef> |
| #include <cstdint> |
| #include <vector> |
| |
| #include "expressions/aggregation/AggregationConcreteHandle.hpp" |
| #include "expressions/aggregation/AggregationHandle.hpp" |
| #include "expressions/aggregation/AggregationID.hpp" |
| #include "storage/ValueAccessorMultiplexer.hpp" |
| #include "types/LongType.hpp" |
| #include "types/TypedValue.hpp" |
| #include "utility/Macros.hpp" |
| |
| namespace quickstep { |
| |
| class AggregationStateHashTableBase; |
| class ColumnVector; |
| class Type; |
| |
| 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 {} |
| |
| std::size_t getPayloadSize() const { return sizeof(count_); } |
| |
| const std::uint8_t* getPayloadAddress() const { |
| return reinterpret_cast<const uint8_t *>(&count_); |
| } |
| |
| 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 AggregationConcreteHandle { |
| public: |
| ~AggregationHandleCount() override {} |
| |
| std::vector<const Type *> getArgumentTypes() const override { |
| if (argument_type_ == nullptr) { |
| return {}; |
| } else { |
| return {argument_type_}; |
| } |
| } |
| |
| const Type* getResultType() const override { |
| return &LongType::InstanceNonNullable(); |
| } |
| |
| AggregationState* createInitialState() const override { |
| return new AggregationStateCount(); |
| } |
| |
| inline void iterateNullaryInl(AggregationStateCount *state) const { |
| state->count_.fetch_add(1, std::memory_order_relaxed); |
| } |
| |
| inline void iterateNullaryInl(std::uint8_t *byte_ptr) const { |
| std::int64_t *count_ptr = reinterpret_cast<std::int64_t *>(byte_ptr); |
| ++(*count_ptr); |
| } |
| |
| inline void iterateUnaryInl(AggregationStateCount *state, |
| const TypedValue &value) const { |
| if ((!nullable_type) || (!value.isNull())) { |
| state->count_.fetch_add(1, std::memory_order_relaxed); |
| } |
| } |
| |
| inline void iterateUnaryInl(const TypedValue &value, |
| std::uint8_t *byte_ptr) const { |
| if ((!nullable_type) || (!value.isNull())) { |
| ++(*reinterpret_cast<std::int64_t *>(byte_ptr)); |
| } |
| } |
| |
| AggregationState* accumulateNullary( |
| const std::size_t num_tuples) const override { |
| return new AggregationStateCount(num_tuples); |
| } |
| |
| AggregationState* accumulateValueAccessor( |
| const std::vector<MultiSourceAttributeId> &argument_ids, |
| const ValueAccessorMultiplexer &accessor_mux) 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)); |
| } |
| |
| std::size_t getPayloadSize() const override { |
| return sizeof(std::int64_t); |
| } |
| |
| void initPayload(std::uint8_t *byte_ptr) const override { |
| std::int64_t *count_ptr = reinterpret_cast<std::int64_t *>(byte_ptr); |
| *count_ptr = 0; |
| } |
| |
| void destroyPayload(std::uint8_t *byte_ptr) const override {} |
| |
| inline void updateStateNullary(std::uint8_t *byte_ptr) const override { |
| if (!block_update_) { |
| iterateNullaryInl(byte_ptr); |
| } |
| } |
| |
| inline void updateStateUnary(const TypedValue &argument, |
| std::uint8_t *byte_ptr) const override { |
| if (!block_update_) { |
| iterateUnaryInl(argument, byte_ptr); |
| } |
| } |
| |
| void mergeStates(const std::uint8_t *source, |
| std::uint8_t *destination) const override; |
| |
| inline TypedValue finalizeHashTableEntry(const std::uint8_t *byte_ptr) const { |
| return TypedValue(*reinterpret_cast<const std::int64_t *>(byte_ptr)); |
| } |
| |
| ColumnVector* finalizeHashTable( |
| const AggregationStateHashTableBase &hash_table, |
| const std::size_t index, |
| std::vector<std::vector<TypedValue>> *group_by_keys) const override; |
| |
| AggregationState* aggregateOnDistinctifyHashTableForSingle( |
| const AggregationStateHashTableBase &distinctify_hash_table) const override; |
| |
| void aggregateOnDistinctifyHashTableForGroupBy( |
| const AggregationStateHashTableBase &distinctify_hash_table, |
| const std::size_t index, |
| AggregationStateHashTableBase *aggregation_hash_table) const override; |
| |
| private: |
| friend class AggregateFunctionCount; |
| |
| /** |
| * @brief Initialize handle for count. |
| * |
| * @param argument_type Type of the value to be counted. The parameter should |
| * be nullptr for nullary aggregation (i.e. COUNT(*)). |
| **/ |
| explicit AggregationHandleCount(const Type *argument_type) |
| : AggregationConcreteHandle(AggregationID::kCount), |
| argument_type_(argument_type) {} |
| |
| const Type *argument_type_; |
| |
| DISALLOW_COPY_AND_ASSIGN(AggregationHandleCount); |
| }; |
| |
| /** @} */ |
| |
| } // namespace quickstep |
| |
| #endif // QUICKSTEP_EXPRESSIONS_AGGREGATION_AGGREGATION_HANDLE_COUNT__ |