mirror of
https://github.com/ClickHouse/ClickHouse.git
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284 lines
9.9 KiB
C++
284 lines
9.9 KiB
C++
#include <DB/Interpreters/Aggregator.h>
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#include <DB/AggregateFunctions/AggregateFunctionCount.h>
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#include <DB/AggregateFunctions/AggregateFunctionSum.h>
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#include <DB/AggregateFunctions/AggregateFunctionAvg.h>
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#include <DB/AggregateFunctions/AggregateFunctionsMinMaxAny.h>
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#include <DB/AggregateFunctions/AggregateFunctionsArgMinMax.h>
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#include <DB/AggregateFunctions/AggregateFunctionUniq.h>
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#include <DB/AggregateFunctions/AggregateFunctionUniqUpTo.h>
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#include <DB/AggregateFunctions/AggregateFunctionGroupArray.h>
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#include <DB/AggregateFunctions/AggregateFunctionGroupUniqArray.h>
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#include <DB/AggregateFunctions/AggregateFunctionQuantile.h>
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#include <DB/AggregateFunctions/AggregateFunctionQuantileTiming.h>
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#include <DB/AggregateFunctions/AggregateFunctionIf.h>
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#include <DB/AggregateFunctions/AggregateFunctionArray.h>
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#include <DB/AggregateFunctions/AggregateFunctionState.h>
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#include <DB/AggregateFunctions/AggregateFunctionMerge.h>
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namespace DB
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{
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/** Шаблон цикла агрегации, позволяющий сгенерировать специализированный вариант для конкретной комбинации агрегатных функций.
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* Отличается от обычного тем, что вызовы агрегатных функций должны инлайниться, а цикл обновления агрегатных функций должен развернуться.
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*
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* Так как возможных комбинаций слишком много, то не представляется возможным сгенерировать их все заранее.
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* Этот шаблон предназначен для того, чтобы инстанцировать его в рантайме,
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* путём запуска компилятора, компиляции shared library и использования её с помощью dlopen.
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*/
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/** Список типов - для удобного перечисления агрегатных функций.
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*/
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template <typename... TTail>
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struct TypeList
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{
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static constexpr size_t size = 0;
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template <size_t I>
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using At = std::nullptr_t;
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template <typename Func, size_t index = 0>
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static void forEach(Func && func)
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{
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}
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};
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template <typename THead, typename... TTail>
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struct TypeList<THead, TTail...>
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{
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using Head = THead;
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using Tail = TypeList<TTail...>;
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static constexpr size_t size = 1 + sizeof...(TTail);
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template <size_t I>
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using At = typename std::template conditional<I == 0, Head, typename Tail::template At<I - 1>>::type;
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template <typename Func, size_t index = 0>
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static void ALWAYS_INLINE forEach(Func && func)
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{
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func.template operator()<Head, index>();
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Tail::template forEach<Func, index + 1>(std::forward<Func>(func));
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}
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};
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struct AggregateFunctionsUpdater
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{
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AggregateFunctionsUpdater(
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const Aggregator::AggregateFunctionsPlainPtrs & aggregate_functions_,
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const Sizes & offsets_of_aggregate_states_,
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Aggregator::AggregateColumns & aggregate_columns_,
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AggregateDataPtr & value_,
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size_t row_num_)
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: aggregate_functions(aggregate_functions_),
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offsets_of_aggregate_states(offsets_of_aggregate_states_),
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aggregate_columns(aggregate_columns_),
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value(value_), row_num(row_num_)
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{
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}
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template <typename AggregateFunction, size_t column_num>
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void operator()() ALWAYS_INLINE;
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const Aggregator::AggregateFunctionsPlainPtrs & aggregate_functions;
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const Sizes & offsets_of_aggregate_states;
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Aggregator::AggregateColumns & aggregate_columns;
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AggregateDataPtr & value;
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size_t row_num;
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};
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template <typename AggregateFunction, size_t column_num>
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void AggregateFunctionsUpdater::operator()()
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{
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static_cast<AggregateFunction *>(aggregate_functions[column_num])->add(
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value + offsets_of_aggregate_states[column_num],
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&aggregate_columns[column_num][0],
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row_num);
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}
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struct AggregateFunctionsCreator
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{
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AggregateFunctionsCreator(
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const Aggregator::AggregateFunctionsPlainPtrs & aggregate_functions_,
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const Sizes & offsets_of_aggregate_states_,
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Aggregator::AggregateColumns & aggregate_columns_,
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AggregateDataPtr & aggregate_data_)
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: aggregate_functions(aggregate_functions_),
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offsets_of_aggregate_states(offsets_of_aggregate_states_),
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aggregate_data(aggregate_data_)
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{
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}
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template <typename AggregateFunction, size_t column_num>
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void operator()() ALWAYS_INLINE;
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const Aggregator::AggregateFunctionsPlainPtrs & aggregate_functions;
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const Sizes & offsets_of_aggregate_states;
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AggregateDataPtr & aggregate_data;
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};
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template <typename AggregateFunction, size_t column_num>
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void AggregateFunctionsCreator::operator()()
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{
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AggregateFunction * func = static_cast<AggregateFunction *>(aggregate_functions[column_num]);
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try
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{
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/** Может возникнуть исключение при нехватке памяти.
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* Для того, чтобы потом всё правильно уничтожилось, "откатываем" часть созданных состояний.
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* Код не очень удобный.
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*/
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func->create(aggregate_data + offsets_of_aggregate_states[column_num]);
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}
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catch (...)
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{
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for (size_t rollback_j = 0; rollback_j < column_num; ++rollback_j)
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func->destroy(aggregate_data + offsets_of_aggregate_states[rollback_j]);
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aggregate_data = nullptr;
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throw;
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}
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}
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template <typename Method, typename AggregateFunctionsList>
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void NO_INLINE Aggregator::executeSpecialized(
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Method & method,
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Arena * aggregates_pool,
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size_t rows,
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ConstColumnPlainPtrs & key_columns,
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AggregateColumns & aggregate_columns,
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const Sizes & key_sizes,
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StringRefs & keys,
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bool no_more_keys,
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AggregateDataPtr overflow_row) const
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{
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typename Method::State state;
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state.init(key_columns);
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if (!no_more_keys)
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executeSpecializedCase<false, Method, AggregateFunctionsList>(
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method, state, aggregates_pool, rows, key_columns, aggregate_columns, key_sizes, keys, overflow_row);
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else
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executeSpecializedCase<true, Method, AggregateFunctionsList>(
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method, state, aggregates_pool, rows, key_columns, aggregate_columns, key_sizes, keys, overflow_row);
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}
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wuninitialized"
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template <bool no_more_keys, typename Method, typename AggregateFunctionsList>
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void NO_INLINE Aggregator::executeSpecializedCase(
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Method & method,
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typename Method::State & state,
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Arena * aggregates_pool,
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size_t rows,
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ConstColumnPlainPtrs & key_columns,
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AggregateColumns & aggregate_columns,
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const Sizes & key_sizes,
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StringRefs & keys,
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AggregateDataPtr overflow_row) const
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{
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/// Для всех строчек.
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typename Method::iterator it;
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typename Method::Key prev_key;
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for (size_t i = 0; i < rows; ++i)
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{
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bool inserted; /// Вставили новый ключ, или такой ключ уже был?
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bool overflow = false; /// Новый ключ не поместился в хэш-таблицу из-за no_more_keys.
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/// Получаем ключ для вставки в хэш-таблицу.
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typename Method::Key key = state.getKey(key_columns, keys_size, i, key_sizes, keys, *aggregates_pool);
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if (!no_more_keys) /// Вставляем.
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{
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/// Оптимизация для часто повторяющихся ключей.
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if (!Method::no_consecutive_keys_optimization)
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{
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if (i != 0 && key == prev_key)
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{
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AggregateDataPtr value = Method::getAggregateData(it->second);
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/// Добавляем значения в агрегатные функции.
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AggregateFunctionsList::forEach(AggregateFunctionsUpdater(
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aggregate_functions, offsets_of_aggregate_states, aggregate_columns, value, i));
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method.onExistingKey(key, keys, *aggregates_pool);
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continue;
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}
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else
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prev_key = key;
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}
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method.data.emplace(key, it, inserted);
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}
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else
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{
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/// Будем добавлять только если ключ уже есть.
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inserted = false;
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it = method.data.find(key);
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if (method.data.end() == it)
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overflow = true;
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}
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/// Если ключ не поместился, и данные не надо агрегировать в отдельную строку, то делать нечего.
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if (no_more_keys && overflow && !overflow_row)
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{
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method.onExistingKey(key, keys, *aggregates_pool);
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continue;
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}
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/// Если вставили новый ключ - инициализируем состояния агрегатных функций, и возможно, что-нибудь связанное с ключом.
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if (inserted)
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{
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method.onNewKey(*it, keys_size, i, keys, *aggregates_pool);
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AggregateDataPtr & aggregate_data = Method::getAggregateData(it->second);
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aggregate_data = aggregates_pool->alloc(total_size_of_aggregate_states);
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AggregateFunctionsList::forEach(AggregateFunctionsCreator(
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aggregate_functions, offsets_of_aggregate_states, aggregate_columns, aggregate_data));
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}
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else
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method.onExistingKey(key, keys, *aggregates_pool);
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AggregateDataPtr value = (!no_more_keys || !overflow) ? Method::getAggregateData(it->second) : overflow_row;
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/// Добавляем значения в агрегатные функции.
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AggregateFunctionsList::forEach(AggregateFunctionsUpdater(
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aggregate_functions, offsets_of_aggregate_states, aggregate_columns, value, i));
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}
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}
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#pragma GCC diagnostic pop
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template <typename AggregateFunctionsList>
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void NO_INLINE Aggregator::executeSpecializedWithoutKey(
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AggregatedDataWithoutKey & res,
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size_t rows,
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AggregateColumns & aggregate_columns) const
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{
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/// Оптимизация в случае единственной агрегатной функции count.
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AggregateFunctionCount * agg_count = aggregates_size == 1
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? typeid_cast<AggregateFunctionCount *>(aggregate_functions[0])
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: NULL;
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if (agg_count)
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agg_count->addDelta(res, rows);
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else
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{
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for (size_t i = 0; i < rows; ++i)
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{
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AggregateFunctionsList::forEach(AggregateFunctionsUpdater(
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aggregate_functions, offsets_of_aggregate_states, aggregate_columns, res, i));
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}
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}
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}
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}
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