mirror of
https://github.com/ClickHouse/ClickHouse.git
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1138 lines
38 KiB
C++
1138 lines
38 KiB
C++
#include <iomanip>
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#include <statdaemons/Stopwatch.h>
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#include <DB/DataTypes/DataTypeAggregateFunction.h>
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#include <DB/Columns/ColumnAggregateFunction.h>
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#include <DB/Columns/ColumnString.h>
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#include <DB/Columns/ColumnFixedString.h>
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#include <DB/Columns/ColumnsNumber.h>
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#include <DB/AggregateFunctions/AggregateFunctionCount.h>
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#include <DB/Interpreters/Aggregator.h>
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namespace DB
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{
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AggregatedDataVariants::~AggregatedDataVariants()
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{
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if (aggregator && !aggregator->all_aggregates_has_trivial_destructor)
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aggregator->destroyAggregateStates(*this);
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}
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void Aggregator::initialize(Block & block)
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{
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Poco::ScopedLock<Poco::FastMutex> lock(mutex);
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if (initialized)
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return;
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initialized = true;
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aggregate_functions.resize(aggregates_size);
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for (size_t i = 0; i < aggregates_size; ++i)
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aggregate_functions[i] = &*aggregates[i].function;
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/// Инициализируем размеры состояний и смещения для агрегатных функций.
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offsets_of_aggregate_states.resize(aggregates_size);
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total_size_of_aggregate_states = 0;
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all_aggregates_has_trivial_destructor = true;
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for (size_t i = 0; i < aggregates_size; ++i)
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{
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offsets_of_aggregate_states[i] = total_size_of_aggregate_states;
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total_size_of_aggregate_states += aggregates[i].function->sizeOfData();
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if (!aggregates[i].function->hasTrivialDestructor())
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all_aggregates_has_trivial_destructor = false;
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}
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/** Всё остальное - только если передан непустой block.
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* (всё остальное не нужно в методе merge блоков с готовыми состояниями агрегатных функций).
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*/
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if (!block)
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return;
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/// Преобразуем имена столбцов в номера, если номера не заданы
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if (keys.empty() && !key_names.empty())
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for (Names::const_iterator it = key_names.begin(); it != key_names.end(); ++it)
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keys.push_back(block.getPositionByName(*it));
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for (AggregateDescriptions::iterator it = aggregates.begin(); it != aggregates.end(); ++it)
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if (it->arguments.empty() && !it->argument_names.empty())
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for (Names::const_iterator jt = it->argument_names.begin(); jt != it->argument_names.end(); ++jt)
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it->arguments.push_back(block.getPositionByName(*jt));
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/// Создадим пример блока, описывающего результат
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if (!sample)
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{
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for (size_t i = 0; i < keys_size; ++i)
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{
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sample.insert(block.getByPosition(keys[i]).cloneEmpty());
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if (sample.getByPosition(i).column->isConst())
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sample.getByPosition(i).column = dynamic_cast<IColumnConst &>(*sample.getByPosition(i).column).convertToFullColumn();
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}
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for (size_t i = 0; i < aggregates_size; ++i)
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{
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ColumnWithNameAndType col;
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col.name = aggregates[i].column_name;
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size_t arguments_size = aggregates[i].arguments.size();
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DataTypes argument_types(arguments_size);
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for (size_t j = 0; j < arguments_size; ++j)
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argument_types[j] = block.getByPosition(aggregates[i].arguments[j]).type;
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col.type = new DataTypeAggregateFunction(aggregates[i].function, argument_types);
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col.column = new ColumnAggregateFunction(aggregates[i].function);
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sample.insert(col);
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}
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}
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}
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AggregatedDataVariants::Type Aggregator::chooseAggregationMethod(const ConstColumnPlainPtrs & key_columns, Sizes & key_sizes)
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{
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bool keys_fit_128_bits = true;
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size_t keys_bytes = 0;
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key_sizes.resize(keys_size);
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for (size_t j = 0; j < keys_size; ++j)
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{
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if (!key_columns[j]->isFixed())
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{
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keys_fit_128_bits = false;
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break;
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}
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key_sizes[j] = key_columns[j]->sizeOfField();
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keys_bytes += key_sizes[j];
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}
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if (keys_bytes > 16)
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keys_fit_128_bits = false;
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/// Если ключей нет
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if (keys_size == 0)
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return AggregatedDataVariants::WITHOUT_KEY;
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/// Если есть один числовой ключ, который помещается в 64 бита
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if (keys_size == 1 && key_columns[0]->isNumeric())
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{
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return AggregatedDataVariants::KEY_64;
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}
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/// Если ключи помещаются в 128 бит, будем использовать хэш-таблицу по упакованным в 128-бит ключам
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if (keys_fit_128_bits)
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return AggregatedDataVariants::KEYS_128;
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/// Если есть один строковый ключ, то используем хэш-таблицу с ним
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if (keys_size == 1
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&& (dynamic_cast<const ColumnString *>(key_columns[0]) || dynamic_cast<const ColumnFixedString *>(key_columns[0])
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|| dynamic_cast<const ColumnConstString *>(key_columns[0])))
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return AggregatedDataVariants::KEY_STRING;
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/// Иначе будем агрегировать по хэшу от ключей.
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return AggregatedDataVariants::HASHED;
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}
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/** Результат хранится в оперативке и должен полностью помещаться в оперативку.
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*/
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void Aggregator::execute(BlockInputStreamPtr stream, AggregatedDataVariants & result)
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{
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StringRefs key(keys_size);
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ConstColumnPlainPtrs key_columns(keys_size);
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typedef std::vector<ConstColumnPlainPtrs> AggregateColumns;
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AggregateColumns aggregate_columns(aggregates_size);
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/** Используется, если есть ограничение на максимальное количество строк при агрегации,
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* и если group_by_overflow_mode == ANY.
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* В этом случае, новые ключи не добавляются в набор, а производится агрегация только по
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* ключам, которые уже успели попасть в набор.
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*/
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bool no_more_keys = false;
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LOG_TRACE(log, "Aggregating");
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Stopwatch watch;
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size_t src_rows = 0;
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size_t src_bytes = 0;
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Sizes key_sizes;
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/// Читаем все данные
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while (Block block = stream->read())
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{
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initialize(block);
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/// result будет уничтожать состояния агрегатных функций в деструкторе
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result.aggregator = this;
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src_rows += block.rows();
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src_bytes += block.bytes();
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for (size_t i = 0; i < aggregates_size; ++i)
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aggregate_columns[i].resize(aggregates[i].arguments.size());
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/// Запоминаем столбцы, с которыми будем работать
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for (size_t i = 0; i < keys_size; ++i)
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key_columns[i] = block.getByPosition(keys[i]).column;
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for (size_t i = 0; i < aggregates_size; ++i)
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{
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for (size_t j = 0; j < aggregate_columns[i].size(); ++j)
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{
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aggregate_columns[i][j] = block.getByPosition(aggregates[i].arguments[j]).column;
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/** Агрегатные функции рассчитывают, что в них передаются полноценные столбцы.
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* Поэтому, стобцы-константы не разрешены в качестве аргументов агрегатных функций.
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*/
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if (aggregate_columns[i][j]->isConst())
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throw Exception("Constants is not allowed as arguments of aggregate functions", ErrorCodes::ILLEGAL_COLUMN);
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}
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}
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size_t rows = block.rows();
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/// Каким способом выполнять агрегацию?
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if (result.empty())
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{
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result.init(chooseAggregationMethod(key_columns, key_sizes));
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result.keys_size = keys_size;
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result.key_sizes = key_sizes;
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LOG_TRACE(log, "Aggregation method: " << result.getMethodName());
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}
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if (result.type == AggregatedDataVariants::WITHOUT_KEY || with_totals)
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{
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AggregatedDataWithoutKey & res = result.without_key;
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if (!res)
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{
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res = result.aggregates_pool->alloc(total_size_of_aggregate_states);
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for (size_t i = 0; i < aggregates_size; ++i)
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aggregate_functions[i]->create(res + offsets_of_aggregate_states[i]);
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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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? dynamic_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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/// Добавляем значения
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for (size_t j = 0; j < aggregates_size; ++j)
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aggregate_functions[j]->add(res + offsets_of_aggregate_states[j], &aggregate_columns[j][0], i);
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}
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}
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}
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if (result.type == AggregatedDataVariants::KEY_64)
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{
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AggregatedDataWithUInt64Key & res = *result.key64;
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const IColumn & column = *key_columns[0];
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/// Для всех строчек
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for (size_t i = 0; i < rows; ++i)
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{
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/// Строим ключ
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UInt64 key = get<UInt64>(column[i]);
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AggregatedDataWithUInt64Key::iterator it;
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bool inserted;
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if (!no_more_keys)
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res.emplace(key, it, inserted);
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else
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{
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inserted = false;
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it = res.find(key);
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if (res.end() == it)
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continue;
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}
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if (inserted)
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{
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it->second = result.aggregates_pool->alloc(total_size_of_aggregate_states);
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for (size_t j = 0; j < aggregates_size; ++j)
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aggregate_functions[j]->create(it->second + offsets_of_aggregate_states[j]);
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}
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/// Добавляем значения
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for (size_t j = 0; j < aggregates_size; ++j)
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aggregate_functions[j]->add(it->second + offsets_of_aggregate_states[j], &aggregate_columns[j][0], i);
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}
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}
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else if (result.type == AggregatedDataVariants::KEY_STRING)
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{
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AggregatedDataWithStringKey & res = *result.key_string;
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const IColumn & column = *key_columns[0];
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if (const ColumnString * column_string = dynamic_cast<const ColumnString *>(&column))
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{
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const ColumnString::Offsets_t & offsets = column_string->getOffsets();
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const ColumnString::Chars_t & data = column_string->getChars();
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/// Для всех строчек
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for (size_t i = 0; i < rows; ++i)
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{
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/// Строим ключ
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StringRef ref(&data[i == 0 ? 0 : offsets[i - 1]], (i == 0 ? offsets[i] : (offsets[i] - offsets[i - 1])) - 1);
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AggregatedDataWithStringKey::iterator it;
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bool inserted;
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if (!no_more_keys)
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res.emplace(ref, it, inserted);
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else
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{
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inserted = false;
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it = res.find(ref);
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if (res.end() == it)
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continue;
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}
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if (inserted)
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{
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it->first.data = result.string_pool.insert(ref.data, ref.size);
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it->second = result.aggregates_pool->alloc(total_size_of_aggregate_states);
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for (size_t j = 0; j < aggregates_size; ++j)
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aggregate_functions[j]->create(it->second + offsets_of_aggregate_states[j]);
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}
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/// Добавляем значения
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for (size_t j = 0; j < aggregates_size; ++j)
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aggregate_functions[j]->add(it->second + offsets_of_aggregate_states[j], &aggregate_columns[j][0], i);
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}
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}
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else if (const ColumnFixedString * column_string = dynamic_cast<const ColumnFixedString *>(&column))
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{
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size_t n = column_string->getN();
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const ColumnFixedString::Chars_t & data = column_string->getChars();
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/// Для всех строчек
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for (size_t i = 0; i < rows; ++i)
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{
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/// Строим ключ
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StringRef ref(&data[i * n], n);
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AggregatedDataWithStringKey::iterator it;
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bool inserted;
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if (!no_more_keys)
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res.emplace(ref, it, inserted);
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else
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{
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inserted = false;
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it = res.find(ref);
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if (res.end() == it)
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continue;
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}
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if (inserted)
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{
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it->first.data = result.string_pool.insert(ref.data, ref.size);
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it->second = result.aggregates_pool->alloc(total_size_of_aggregate_states);
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for (size_t j = 0; j < aggregates_size; ++j)
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aggregate_functions[j]->create(it->second + offsets_of_aggregate_states[j]);
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}
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/// Добавляем значения
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for (size_t j = 0; j < aggregates_size; ++j)
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aggregate_functions[j]->add(it->second + offsets_of_aggregate_states[j], &aggregate_columns[j][0], i);
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}
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}
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else
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throw Exception("Illegal type of column when aggregating by string key: " + column.getName(), ErrorCodes::ILLEGAL_COLUMN);
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}
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else if (result.type == AggregatedDataVariants::KEYS_128)
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{
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AggregatedDataWithKeys128 & res = *result.keys128;
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/// Для всех строчек
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for (size_t i = 0; i < rows; ++i)
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{
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AggregatedDataWithKeys128::iterator it;
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bool inserted;
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UInt128 key128 = pack128(i, keys_size, key_columns, key_sizes);
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if (!no_more_keys)
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res.emplace(key128, it, inserted);
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else
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{
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inserted = false;
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it = res.find(key128);
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if (res.end() == it)
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continue;
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}
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if (inserted)
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{
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it->second = result.aggregates_pool->alloc(total_size_of_aggregate_states);
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for (size_t j = 0; j < aggregates_size; ++j)
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aggregate_functions[j]->create(it->second + offsets_of_aggregate_states[j]);
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}
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/// Добавляем значения
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for (size_t j = 0; j < aggregates_size; ++j)
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aggregate_functions[j]->add(it->second + offsets_of_aggregate_states[j], &aggregate_columns[j][0], i);
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}
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}
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else if (result.type == AggregatedDataVariants::HASHED)
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{
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AggregatedDataHashed & res = *result.hashed;
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/// Для всех строчек
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for (size_t i = 0; i < rows; ++i)
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{
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AggregatedDataHashed::iterator it;
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bool inserted;
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UInt128 key128 = hash128(i, keys_size, key_columns, key);
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if (!no_more_keys)
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res.emplace(key128, it, inserted);
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else
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{
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inserted = false;
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it = res.find(key128);
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if (res.end() == it)
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continue;
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}
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if (inserted)
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{
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it->second.first = placeKeysInPool(i, keys_size, key, result.keys_pool);
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it->second.second = result.aggregates_pool->alloc(total_size_of_aggregate_states);
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for (size_t j = 0; j < aggregates_size; ++j)
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aggregate_functions[j]->create(it->second.second + offsets_of_aggregate_states[j]);
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}
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/// Добавляем значения
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for (size_t j = 0; j < aggregates_size; ++j)
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aggregate_functions[j]->add(it->second.second + offsets_of_aggregate_states[j], &aggregate_columns[j][0], i);
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}
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}
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else if (result.type != AggregatedDataVariants::WITHOUT_KEY)
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throw Exception("Unknown aggregated data variant.", ErrorCodes::UNKNOWN_AGGREGATED_DATA_VARIANT);
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/// Проверка ограничений.
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if (!no_more_keys && max_rows_to_group_by && result.size() > max_rows_to_group_by)
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{
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if (group_by_overflow_mode == OverflowMode::THROW)
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throw Exception("Limit for rows to GROUP BY exceeded: has " + toString(result.size())
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+ " rows, maximum: " + toString(max_rows_to_group_by),
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ErrorCodes::TOO_MUCH_ROWS);
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else if (group_by_overflow_mode == OverflowMode::BREAK)
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break;
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else if (group_by_overflow_mode == OverflowMode::ANY)
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no_more_keys = true;
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else
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throw Exception("Logical error: unknown overflow mode", ErrorCodes::LOGICAL_ERROR);
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}
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}
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double elapsed_seconds = watch.elapsedSeconds();
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size_t rows = result.size();
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LOG_TRACE(log, std::fixed << std::setprecision(3)
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<< "Aggregated. " << src_rows << " to " << rows << " rows (from " << src_bytes / 1048576.0 << " MiB)"
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<< " in " << elapsed_seconds << " sec."
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<< " (" << src_rows / elapsed_seconds << " rows/sec., " << src_bytes / elapsed_seconds / 1048576.0 << " MiB/sec.)");
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}
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Block Aggregator::convertToBlock(AggregatedDataVariants & data_variants, bool separate_totals, Block & totals, bool final)
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{
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Block res = sample.cloneEmpty();
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size_t rows = data_variants.size();
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if (with_totals && separate_totals && rows != 0)
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--rows; /// Строчка с "тотальными" значениями идёт отдельно.
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|
||
LOG_TRACE(log, "Converting aggregated data to block");
|
||
|
||
Stopwatch watch;
|
||
|
||
/// В какой структуре данных агрегированы данные?
|
||
if (data_variants.empty())
|
||
return Block();
|
||
|
||
typedef std::vector<ColumnAggregateFunction::Container_t *> AggregateColumns;
|
||
|
||
ColumnPlainPtrs key_columns(keys_size);
|
||
AggregateColumns aggregate_columns(aggregates_size);
|
||
ColumnPlainPtrs final_aggregate_columns(aggregates_size);
|
||
|
||
for (size_t i = 0; i < keys_size; ++i)
|
||
{
|
||
key_columns[i] = res.getByPosition(i).column;
|
||
key_columns[i]->reserve(rows);
|
||
}
|
||
|
||
for (size_t i = 0; i < aggregates_size; ++i)
|
||
{
|
||
if (!final)
|
||
{
|
||
/// Столбец ColumnAggregateFunction захватывает разделяемое владение ареной с состояниями агрегатных функций.
|
||
ColumnAggregateFunction & column_aggregate_func = static_cast<ColumnAggregateFunction &>(*res.getByPosition(i + keys_size).column);
|
||
|
||
for (size_t j = 0; j < data_variants.aggregates_pools.size(); ++j)
|
||
column_aggregate_func.addArena(data_variants.aggregates_pools[j]);
|
||
|
||
aggregate_columns[i] = &column_aggregate_func.getData();
|
||
aggregate_columns[i]->resize(rows);
|
||
}
|
||
else
|
||
{
|
||
ColumnWithNameAndType & column = res.getByPosition(i + keys_size);
|
||
column.type = aggregate_functions[i]->getReturnType();
|
||
column.column = column.type->createColumn();
|
||
column.column->reserve(rows);
|
||
|
||
final_aggregate_columns[i] = column.column;
|
||
}
|
||
}
|
||
|
||
if (data_variants.type == AggregatedDataVariants::WITHOUT_KEY || with_totals)
|
||
{
|
||
AggregatedDataWithoutKey & data = data_variants.without_key;
|
||
|
||
if (with_totals && separate_totals)
|
||
{
|
||
for (size_t i = 0; i < aggregates_size; ++i)
|
||
{
|
||
totals = res.cloneEmpty();
|
||
|
||
/// Для тотальных данных вместо ключей пишутся значения по-умолчанию (нули, пустые строки).
|
||
for (size_t i = 0; i < keys_size; ++i)
|
||
totals.getByPosition(i).column->insertDefault();
|
||
|
||
for (size_t i = 0; i < aggregates_size; ++i)
|
||
{
|
||
ColumnWithNameAndType & column = totals.getByPosition(i + keys_size);
|
||
column.type = aggregate_functions[i]->getReturnType();
|
||
column.column = column.type->createColumn();
|
||
aggregate_functions[i]->insertResultInto(data + offsets_of_aggregate_states[i], *column.column);
|
||
}
|
||
}
|
||
}
|
||
else
|
||
{
|
||
if (!final)
|
||
for (size_t i = 0; i < aggregates_size; ++i)
|
||
(*aggregate_columns[i])[0] = data + offsets_of_aggregate_states[i];
|
||
else
|
||
for (size_t i = 0; i < aggregates_size; ++i)
|
||
aggregate_functions[i]->insertResultInto(data + offsets_of_aggregate_states[i], *final_aggregate_columns[i]);
|
||
|
||
if (with_totals)
|
||
for (size_t i = 0; i < keys_size; ++i)
|
||
key_columns[i]->insertDefault();
|
||
}
|
||
}
|
||
|
||
if (data_variants.type == AggregatedDataVariants::KEY_64)
|
||
{
|
||
AggregatedDataWithUInt64Key & data = *data_variants.key64;
|
||
|
||
IColumn & first_column = *key_columns[0];
|
||
|
||
size_t j = with_totals && !separate_totals ? 1 : 0;
|
||
|
||
if (!final)
|
||
{
|
||
for (AggregatedDataWithUInt64Key::const_iterator it = data.begin(); it != data.end(); ++it, ++j)
|
||
{
|
||
first_column.insertData(reinterpret_cast<const char *>(&it->first), sizeof(it->first));
|
||
|
||
for (size_t i = 0; i < aggregates_size; ++i)
|
||
(*aggregate_columns[i])[j] = it->second + offsets_of_aggregate_states[i];
|
||
}
|
||
}
|
||
else
|
||
{
|
||
for (AggregatedDataWithUInt64Key::const_iterator it = data.begin(); it != data.end(); ++it, ++j)
|
||
{
|
||
first_column.insertData(reinterpret_cast<const char *>(&it->first), sizeof(it->first));
|
||
|
||
for (size_t i = 0; i < aggregates_size; ++i)
|
||
aggregate_functions[i]->insertResultInto(it->second + offsets_of_aggregate_states[i], *final_aggregate_columns[i]);
|
||
}
|
||
}
|
||
}
|
||
else if (data_variants.type == AggregatedDataVariants::KEY_STRING)
|
||
{
|
||
AggregatedDataWithStringKey & data = *data_variants.key_string;
|
||
IColumn & first_column = *key_columns[0];
|
||
|
||
size_t j = with_totals && !separate_totals ? 1 : 0;
|
||
|
||
if (!final)
|
||
{
|
||
for (AggregatedDataWithStringKey::const_iterator it = data.begin(); it != data.end(); ++it, ++j)
|
||
{
|
||
first_column.insertData(it->first.data, it->first.size);
|
||
|
||
for (size_t i = 0; i < aggregates_size; ++i)
|
||
(*aggregate_columns[i])[j] = it->second + offsets_of_aggregate_states[i];
|
||
}
|
||
}
|
||
else
|
||
{
|
||
for (AggregatedDataWithStringKey::const_iterator it = data.begin(); it != data.end(); ++it, ++j)
|
||
{
|
||
first_column.insertData(it->first.data, it->first.size);
|
||
|
||
for (size_t i = 0; i < aggregates_size; ++i)
|
||
aggregate_functions[i]->insertResultInto(it->second + offsets_of_aggregate_states[i], *final_aggregate_columns[i]);
|
||
}
|
||
}
|
||
}
|
||
else if (data_variants.type == AggregatedDataVariants::KEYS_128)
|
||
{
|
||
AggregatedDataWithKeys128 & data = *data_variants.keys128;
|
||
|
||
size_t j = with_totals && !separate_totals ? 1 : 0;
|
||
|
||
if (!final)
|
||
{
|
||
for (AggregatedDataWithKeys128::const_iterator it = data.begin(); it != data.end(); ++it, ++j)
|
||
{
|
||
size_t offset = 0;
|
||
for (size_t i = 0; i < keys_size; ++i)
|
||
{
|
||
size_t size = data_variants.key_sizes[i];
|
||
key_columns[i]->insertData(reinterpret_cast<const char *>(&it->first) + offset, size);
|
||
offset += size;
|
||
}
|
||
|
||
for (size_t i = 0; i < aggregates_size; ++i)
|
||
(*aggregate_columns[i])[j] = it->second + offsets_of_aggregate_states[i];
|
||
}
|
||
}
|
||
else
|
||
{
|
||
for (AggregatedDataWithKeys128::const_iterator it = data.begin(); it != data.end(); ++it, ++j)
|
||
{
|
||
size_t offset = 0;
|
||
for (size_t i = 0; i < keys_size; ++i)
|
||
{
|
||
size_t size = data_variants.key_sizes[i];
|
||
key_columns[i]->insertData(reinterpret_cast<const char *>(&it->first) + offset, size);
|
||
offset += size;
|
||
}
|
||
|
||
for (size_t i = 0; i < aggregates_size; ++i)
|
||
aggregate_functions[i]->insertResultInto(it->second + offsets_of_aggregate_states[i], *final_aggregate_columns[i]);
|
||
}
|
||
}
|
||
}
|
||
else if (data_variants.type == AggregatedDataVariants::HASHED)
|
||
{
|
||
AggregatedDataHashed & data = *data_variants.hashed;
|
||
|
||
size_t j = with_totals && !separate_totals ? 1 : 0;
|
||
|
||
if (!final)
|
||
{
|
||
for (AggregatedDataHashed::const_iterator it = data.begin(); it != data.end(); ++it, ++j)
|
||
{
|
||
for (size_t i = 0; i < keys_size; ++i)
|
||
key_columns[i]->insertDataWithTerminatingZero(it->second.first[i].data, it->second.first[i].size);
|
||
|
||
for (size_t i = 0; i < aggregates_size; ++i)
|
||
(*aggregate_columns[i])[j] = it->second.second + offsets_of_aggregate_states[i];
|
||
}
|
||
}
|
||
else
|
||
{
|
||
for (AggregatedDataHashed::const_iterator it = data.begin(); it != data.end(); ++it, ++j)
|
||
{
|
||
for (size_t i = 0; i < keys_size; ++i)
|
||
key_columns[i]->insertDataWithTerminatingZero(it->second.first[i].data, it->second.first[i].size);
|
||
|
||
for (size_t i = 0; i < aggregates_size; ++i)
|
||
aggregate_functions[i]->insertResultInto(it->second.second + offsets_of_aggregate_states[i], *final_aggregate_columns[i]);
|
||
}
|
||
}
|
||
}
|
||
else if (data_variants.type != AggregatedDataVariants::WITHOUT_KEY)
|
||
throw Exception("Unknown aggregated data variant.", ErrorCodes::UNKNOWN_AGGREGATED_DATA_VARIANT);
|
||
|
||
if (!final)
|
||
{
|
||
/// data_variants не будет уничтожать состояния агрегатных функций в деструкторе. Теперь состояниями владеют ColumnAggregateFunction.
|
||
data_variants.aggregator = NULL;
|
||
}
|
||
|
||
/// Изменяем размер столбцов-констант в блоке.
|
||
size_t columns = res.columns();
|
||
for (size_t i = 0; i < columns; ++i)
|
||
if (res.getByPosition(i).column->isConst())
|
||
res.getByPosition(i).column = res.getByPosition(i).column->cut(0, rows);
|
||
|
||
double elapsed_seconds = watch.elapsedSeconds();
|
||
LOG_TRACE(log, std::fixed << std::setprecision(3)
|
||
<< "Converted aggregated data to block. "
|
||
<< rows << " rows, " << res.bytes() / 1048576.0 << " MiB"
|
||
<< " in " << elapsed_seconds << " sec."
|
||
<< " (" << rows / elapsed_seconds << " rows/sec., " << res.bytes() / elapsed_seconds / 1048576.0 << " MiB/sec.)");
|
||
|
||
return res;
|
||
}
|
||
|
||
|
||
AggregatedDataVariantsPtr Aggregator::merge(ManyAggregatedDataVariants & data_variants)
|
||
{
|
||
if (data_variants.empty())
|
||
throw Exception("Empty data passed to Aggregator::merge().", ErrorCodes::EMPTY_DATA_PASSED);
|
||
|
||
LOG_TRACE(log, "Merging aggregated data");
|
||
|
||
Stopwatch watch;
|
||
|
||
AggregatedDataVariantsPtr res = data_variants[0];
|
||
|
||
/// Все результаты агрегации соединяем с первым.
|
||
size_t rows = res->size();
|
||
for (size_t i = 1, size = data_variants.size(); i < size; ++i)
|
||
{
|
||
rows += data_variants[i]->size();
|
||
AggregatedDataVariants & current = *data_variants[i];
|
||
|
||
res->aggregates_pools.insert(res->aggregates_pools.end(), current.aggregates_pools.begin(), current.aggregates_pools.end());
|
||
|
||
if (current.empty())
|
||
continue;
|
||
|
||
if (res->empty())
|
||
{
|
||
res = data_variants[i];
|
||
continue;
|
||
}
|
||
|
||
if (res->type != current.type)
|
||
throw Exception("Cannot merge different aggregated data variants.", ErrorCodes::CANNOT_MERGE_DIFFERENT_AGGREGATED_DATA_VARIANTS);
|
||
|
||
/// В какой структуре данных агрегированы данные?
|
||
if (res->type == AggregatedDataVariants::WITHOUT_KEY || with_totals)
|
||
{
|
||
AggregatedDataWithoutKey & res_data = res->without_key;
|
||
AggregatedDataWithoutKey & current_data = current.without_key;
|
||
|
||
for (size_t i = 0; i < aggregates_size; ++i)
|
||
{
|
||
aggregate_functions[i]->merge(res_data + offsets_of_aggregate_states[i], current_data + offsets_of_aggregate_states[i]);
|
||
aggregate_functions[i]->destroy(current_data + offsets_of_aggregate_states[i]);
|
||
}
|
||
}
|
||
|
||
if (res->type == AggregatedDataVariants::KEY_64)
|
||
{
|
||
AggregatedDataWithUInt64Key & res_data = *res->key64;
|
||
AggregatedDataWithUInt64Key & current_data = *current.key64;
|
||
|
||
for (AggregatedDataWithUInt64Key::const_iterator it = current_data.begin(); it != current_data.end(); ++it)
|
||
{
|
||
AggregatedDataWithUInt64Key::iterator res_it;
|
||
bool inserted;
|
||
res_data.emplace(it->first, res_it, inserted);
|
||
|
||
if (!inserted)
|
||
{
|
||
for (size_t i = 0; i < aggregates_size; ++i)
|
||
{
|
||
aggregate_functions[i]->merge(res_it->second + offsets_of_aggregate_states[i], it->second + offsets_of_aggregate_states[i]);
|
||
aggregate_functions[i]->destroy(it->second + offsets_of_aggregate_states[i]);
|
||
}
|
||
}
|
||
else
|
||
res_it->second = it->second;
|
||
}
|
||
}
|
||
else if (res->type == AggregatedDataVariants::KEY_STRING)
|
||
{
|
||
AggregatedDataWithStringKey & res_data = *res->key_string;
|
||
AggregatedDataWithStringKey & current_data = *current.key_string;
|
||
|
||
for (AggregatedDataWithStringKey::const_iterator it = current_data.begin(); it != current_data.end(); ++it)
|
||
{
|
||
AggregatedDataWithStringKey::iterator res_it;
|
||
bool inserted;
|
||
res_data.emplace(it->first, res_it, inserted);
|
||
|
||
if (!inserted)
|
||
{
|
||
for (size_t i = 0; i < aggregates_size; ++i)
|
||
{
|
||
aggregate_functions[i]->merge(res_it->second + offsets_of_aggregate_states[i], it->second + offsets_of_aggregate_states[i]);
|
||
aggregate_functions[i]->destroy(it->second + offsets_of_aggregate_states[i]);
|
||
}
|
||
}
|
||
else
|
||
res_it->second = it->second;
|
||
}
|
||
}
|
||
else if (res->type == AggregatedDataVariants::KEYS_128)
|
||
{
|
||
AggregatedDataWithKeys128 & res_data = *res->keys128;
|
||
AggregatedDataWithKeys128 & current_data = *current.keys128;
|
||
|
||
for (AggregatedDataWithKeys128::iterator it = current_data.begin(); it != current_data.end(); ++it)
|
||
{
|
||
AggregatedDataWithKeys128::iterator res_it;
|
||
bool inserted;
|
||
res_data.emplace(it->first, res_it, inserted);
|
||
|
||
if (!inserted)
|
||
{
|
||
for (size_t i = 0; i < aggregates_size; ++i)
|
||
{
|
||
aggregate_functions[i]->merge(res_it->second + offsets_of_aggregate_states[i], it->second + offsets_of_aggregate_states[i]);
|
||
aggregate_functions[i]->destroy(it->second + offsets_of_aggregate_states[i]);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
res_it->second = it->second;
|
||
}
|
||
}
|
||
}
|
||
else if (res->type == AggregatedDataVariants::HASHED)
|
||
{
|
||
AggregatedDataHashed & res_data = *res->hashed;
|
||
AggregatedDataHashed & current_data = *current.hashed;
|
||
|
||
for (AggregatedDataHashed::iterator it = current_data.begin(); it != current_data.end(); ++it)
|
||
{
|
||
AggregatedDataHashed::iterator res_it;
|
||
bool inserted;
|
||
res_data.emplace(it->first, res_it, inserted);
|
||
|
||
if (!inserted)
|
||
{
|
||
for (size_t i = 0; i < aggregates_size; ++i)
|
||
{
|
||
aggregate_functions[i]->merge(res_it->second.second + offsets_of_aggregate_states[i], it->second.second + offsets_of_aggregate_states[i]);
|
||
aggregate_functions[i]->destroy(it->second.second + offsets_of_aggregate_states[i]);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
res_it->second = it->second;
|
||
}
|
||
}
|
||
}
|
||
else if (res->type != AggregatedDataVariants::WITHOUT_KEY)
|
||
throw Exception("Unknown aggregated data variant.", ErrorCodes::UNKNOWN_AGGREGATED_DATA_VARIANT);
|
||
|
||
/// current не будет уничтожать состояния агрегатных функций в деструкторе
|
||
current.aggregator = NULL;
|
||
}
|
||
|
||
double elapsed_seconds = watch.elapsedSeconds();
|
||
size_t res_rows = res->size();
|
||
|
||
LOG_TRACE(log, std::fixed << std::setprecision(3)
|
||
<< "Merged aggregated data. "
|
||
<< "From " << rows << " to " << res_rows << " rows (efficiency: " << static_cast<double>(rows) / res_rows << ")"
|
||
<< " in " << elapsed_seconds << " sec."
|
||
<< " (" << rows / elapsed_seconds << " rows/sec.)");
|
||
|
||
return res;
|
||
}
|
||
|
||
|
||
void Aggregator::merge(BlockInputStreamPtr stream, AggregatedDataVariants & result)
|
||
{
|
||
StringRefs key(keys_size);
|
||
ConstColumnPlainPtrs key_columns(keys_size);
|
||
|
||
typedef ColumnAggregateFunction::Container_t * AggregateColumn;
|
||
typedef std::vector<AggregateColumn> AggregateColumns;
|
||
AggregateColumns aggregate_columns(aggregates_size);
|
||
|
||
Block empty_block;
|
||
initialize(empty_block);
|
||
|
||
/// result будет уничтожать состояния агрегатных функций в деструкторе
|
||
result.aggregator = this;
|
||
|
||
/// Читаем все данные
|
||
while (Block block = stream->read())
|
||
{
|
||
LOG_TRACE(log, "Merging aggregated block");
|
||
|
||
if (!sample)
|
||
for (size_t i = 0; i < keys_size + aggregates_size; ++i)
|
||
sample.insert(block.getByPosition(i).cloneEmpty());
|
||
|
||
/// Запоминаем столбцы, с которыми будем работать
|
||
for (size_t i = 0; i < keys_size; ++i)
|
||
key_columns[i] = block.getByPosition(i).column;
|
||
|
||
for (size_t i = 0; i < aggregates_size; ++i)
|
||
aggregate_columns[i] = &dynamic_cast<ColumnAggregateFunction &>(*block.getByPosition(keys_size + i).column).getData();
|
||
|
||
size_t rows = block.rows();
|
||
|
||
/// Каким способом выполнять агрегацию?
|
||
Sizes key_sizes;
|
||
AggregatedDataVariants::Type method = chooseAggregationMethod(key_columns, key_sizes);
|
||
|
||
if (result.empty())
|
||
{
|
||
result.init(method);
|
||
result.keys_size = keys_size;
|
||
result.key_sizes = key_sizes;
|
||
}
|
||
|
||
if (result.type == AggregatedDataVariants::WITHOUT_KEY || with_totals)
|
||
{
|
||
AggregatedDataWithoutKey & res = result.without_key;
|
||
if (!res)
|
||
{
|
||
res = result.aggregates_pool->alloc(total_size_of_aggregate_states);
|
||
|
||
for (size_t i = 0; i < aggregates_size; ++i)
|
||
aggregate_functions[i]->create(res + offsets_of_aggregate_states[i]);
|
||
}
|
||
|
||
/// Добавляем значения
|
||
for (size_t i = 0; i < aggregates_size; ++i)
|
||
aggregate_functions[i]->merge(res + offsets_of_aggregate_states[i], (*aggregate_columns[i])[0]);
|
||
}
|
||
|
||
if (result.type == AggregatedDataVariants::KEY_64)
|
||
{
|
||
AggregatedDataWithUInt64Key & res = *result.key64;
|
||
const IColumn & column = *key_columns[0];
|
||
|
||
/// Для всех строчек
|
||
for (size_t i = with_totals ? 1 : 0; i < rows; ++i)
|
||
{
|
||
/// Строим ключ
|
||
UInt64 key = get<UInt64>(column[i]);
|
||
|
||
AggregatedDataWithUInt64Key::iterator it;
|
||
bool inserted;
|
||
res.emplace(key, it, inserted);
|
||
|
||
if (inserted)
|
||
{
|
||
it->second = result.aggregates_pool->alloc(total_size_of_aggregate_states);
|
||
|
||
for (size_t j = 0; j < aggregates_size; ++j)
|
||
aggregate_functions[j]->create(it->second + offsets_of_aggregate_states[j]);
|
||
}
|
||
|
||
/// Добавляем значения
|
||
for (size_t j = 0; j < aggregates_size; ++j)
|
||
aggregate_functions[j]->merge(it->second + offsets_of_aggregate_states[j], (*aggregate_columns[j])[i]);
|
||
}
|
||
}
|
||
else if (result.type == AggregatedDataVariants::KEY_STRING)
|
||
{
|
||
AggregatedDataWithStringKey & res = *result.key_string;
|
||
const IColumn & column = *key_columns[0];
|
||
|
||
if (const ColumnString * column_string = dynamic_cast<const ColumnString *>(&column))
|
||
{
|
||
const ColumnString::Offsets_t & offsets = column_string->getOffsets();
|
||
const ColumnString::Chars_t & data = column_string->getChars();
|
||
|
||
/// Для всех строчек
|
||
for (size_t i = with_totals ? 1 : 0; i < rows; ++i)
|
||
{
|
||
/// Строим ключ
|
||
StringRef ref(&data[i == 0 ? 0 : offsets[i - 1]], (i == 0 ? offsets[i] : (offsets[i] - offsets[i - 1])) - 1);
|
||
|
||
AggregatedDataWithStringKey::iterator it;
|
||
bool inserted;
|
||
res.emplace(ref, it, inserted);
|
||
|
||
if (inserted)
|
||
{
|
||
it->first.data = result.string_pool.insert(ref.data, ref.size);
|
||
it->second = result.aggregates_pool->alloc(total_size_of_aggregate_states);
|
||
|
||
for (size_t j = 0; j < aggregates_size; ++j)
|
||
aggregate_functions[j]->create(it->second + offsets_of_aggregate_states[j]);
|
||
}
|
||
|
||
/// Добавляем значения
|
||
for (size_t j = 0; j < aggregates_size; ++j)
|
||
aggregate_functions[j]->merge(it->second + offsets_of_aggregate_states[j], (*aggregate_columns[j])[i]);
|
||
}
|
||
}
|
||
else if (const ColumnFixedString * column_string = dynamic_cast<const ColumnFixedString *>(&column))
|
||
{
|
||
size_t n = column_string->getN();
|
||
const ColumnFixedString::Chars_t & data = column_string->getChars();
|
||
|
||
/// Для всех строчек
|
||
for (size_t i = with_totals ? 1 : 0; i < rows; ++i)
|
||
{
|
||
/// Строим ключ
|
||
StringRef ref(&data[i * n], n);
|
||
|
||
AggregatedDataWithStringKey::iterator it;
|
||
bool inserted;
|
||
res.emplace(ref, it, inserted);
|
||
|
||
if (inserted)
|
||
{
|
||
it->first.data = result.string_pool.insert(ref.data, ref.size);
|
||
it->second = result.aggregates_pool->alloc(total_size_of_aggregate_states);
|
||
|
||
for (size_t j = 0; j < aggregates_size; ++j)
|
||
aggregate_functions[j]->create(it->second + offsets_of_aggregate_states[j]);
|
||
}
|
||
|
||
/// Добавляем значения
|
||
for (size_t j = 0; j < aggregates_size; ++j)
|
||
aggregate_functions[j]->merge(it->second + offsets_of_aggregate_states[j], (*aggregate_columns[j])[i]);
|
||
}
|
||
}
|
||
else
|
||
throw Exception("Illegal type of column when aggregating by string key: " + column.getName(), ErrorCodes::ILLEGAL_COLUMN);
|
||
}
|
||
else if (result.type == AggregatedDataVariants::KEYS_128)
|
||
{
|
||
AggregatedDataWithKeys128 & res = *result.keys128;
|
||
|
||
/// Для всех строчек
|
||
for (size_t i = with_totals ? 1 : 0; i < rows; ++i)
|
||
{
|
||
AggregatedDataWithKeys128::iterator it;
|
||
bool inserted;
|
||
res.emplace(pack128(i, keys_size, key_columns, key_sizes), it, inserted);
|
||
|
||
if (inserted)
|
||
{
|
||
it->second = result.aggregates_pool->alloc(total_size_of_aggregate_states);
|
||
|
||
for (size_t j = 0; j < aggregates_size; ++j)
|
||
aggregate_functions[j]->create(it->second + offsets_of_aggregate_states[j]);
|
||
}
|
||
|
||
/// Добавляем значения
|
||
for (size_t j = 0; j < aggregates_size; ++j)
|
||
aggregate_functions[j]->merge(it->second + offsets_of_aggregate_states[j], (*aggregate_columns[j])[i]);
|
||
}
|
||
}
|
||
else if (result.type == AggregatedDataVariants::HASHED)
|
||
{
|
||
AggregatedDataHashed & res = *result.hashed;
|
||
|
||
/// Для всех строчек
|
||
for (size_t i = with_totals ? 1 : 0; i < rows; ++i)
|
||
{
|
||
AggregatedDataHashed::iterator it;
|
||
bool inserted;
|
||
res.emplace(hash128(i, keys_size, key_columns, key), it, inserted);
|
||
|
||
if (inserted)
|
||
{
|
||
it->second.first = placeKeysInPool(i, keys_size, key, result.keys_pool);
|
||
it->second.second = result.aggregates_pool->alloc(total_size_of_aggregate_states);
|
||
|
||
for (size_t j = 0; j < aggregates_size; ++j)
|
||
aggregate_functions[j]->create(it->second.second + offsets_of_aggregate_states[j]);
|
||
}
|
||
|
||
/// Добавляем значения
|
||
for (size_t j = 0; j < aggregates_size; ++j)
|
||
aggregate_functions[j]->merge(it->second.second + offsets_of_aggregate_states[j], (*aggregate_columns[j])[i]);
|
||
}
|
||
}
|
||
else if (result.type != AggregatedDataVariants::WITHOUT_KEY)
|
||
throw Exception("Unknown aggregated data variant.", ErrorCodes::UNKNOWN_AGGREGATED_DATA_VARIANT);
|
||
|
||
LOG_TRACE(log, "Merged aggregated block");
|
||
}
|
||
}
|
||
|
||
|
||
void Aggregator::destroyAggregateStates(AggregatedDataVariants & result)
|
||
{
|
||
if (result.size() == 0)
|
||
return;
|
||
|
||
LOG_TRACE(log, "Destroying aggregate states");
|
||
|
||
/// В какой структуре данных агрегированы данные?
|
||
if (result.type == AggregatedDataVariants::WITHOUT_KEY || with_totals)
|
||
{
|
||
AggregatedDataWithoutKey & res_data = result.without_key;
|
||
|
||
for (size_t i = 0; i < aggregates_size; ++i)
|
||
aggregate_functions[i]->destroy(res_data + offsets_of_aggregate_states[i]);
|
||
}
|
||
if (result.type == AggregatedDataVariants::KEY_64)
|
||
{
|
||
AggregatedDataWithUInt64Key & res_data = *result.key64;
|
||
|
||
for (AggregatedDataWithUInt64Key::const_iterator it = res_data.begin(); it != res_data.end(); ++it)
|
||
for (size_t i = 0; i < aggregates_size; ++i)
|
||
aggregate_functions[i]->destroy(it->second + offsets_of_aggregate_states[i]);
|
||
}
|
||
else if (result.type == AggregatedDataVariants::KEY_STRING)
|
||
{
|
||
AggregatedDataWithStringKey & res_data = *result.key_string;
|
||
|
||
for (AggregatedDataWithStringKey::const_iterator it = res_data.begin(); it != res_data.end(); ++it)
|
||
for (size_t i = 0; i < aggregates_size; ++i)
|
||
aggregate_functions[i]->destroy(it->second + offsets_of_aggregate_states[i]);
|
||
}
|
||
else if (result.type == AggregatedDataVariants::HASHED)
|
||
{
|
||
AggregatedDataHashed & res_data = *result.hashed;
|
||
|
||
for (AggregatedDataHashed::iterator it = res_data.begin(); it != res_data.end(); ++it)
|
||
for (size_t i = 0; i < aggregates_size; ++i)
|
||
aggregate_functions[i]->destroy(it->second.second + offsets_of_aggregate_states[i]);
|
||
}
|
||
}
|
||
|
||
|
||
String Aggregator::getID() const
|
||
{
|
||
std::stringstream res;
|
||
|
||
if (keys.empty())
|
||
{
|
||
res << "key_names";
|
||
for (size_t i = 0; i < key_names.size(); ++i)
|
||
res << ", " << key_names[i];
|
||
}
|
||
else
|
||
{
|
||
res << "keys";
|
||
for (size_t i = 0; i < keys.size(); ++i)
|
||
res << ", " << keys[i];
|
||
}
|
||
|
||
res << ", aggregates";
|
||
for (size_t i = 0; i < aggregates.size(); ++i)
|
||
res << ", " << aggregates[i].column_name;
|
||
|
||
return res.str();
|
||
}
|
||
|
||
}
|