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284 lines
7.8 KiB
C++
284 lines
7.8 KiB
C++
#pragma once
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#include <DB/Common/Arena.h>
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#include <DB/AggregateFunctions/IAggregateFunction.h>
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#include <DB/Columns/IColumn.h>
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#include <DB/Core/Field.h>
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#include <DB/IO/ReadBufferFromString.h>
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namespace DB
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{
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/** Отвечает за владение и уничтожение состояний агрегатных функций.
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* В ColumnAggregateFunction хранится SharedPtr на него,
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* чтобы уничтожить все состояния агрегатных функций только после того,
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* как они перестали быть нужными во всех столбцах, использующих общие состояния.
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*
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* Состояния агрегатных функций выделены в пуле (arena) (возможно, в нескольких).
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* а в массиве (data) хранятся указатели на них.
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*/
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class AggregateStatesHolder
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{
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public:
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AggregateFunctionPtr func; /// Используется для уничтожения состояний и для финализации значений.
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Arenas arenas;
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PODArray<AggregateDataPtr> data;
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AggregateStatesHolder(const AggregateFunctionPtr & func_) : func(func_) {}
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AggregateStatesHolder(const AggregateFunctionPtr & func_, const Arenas & arenas_) : func(func_), arenas(arenas_) {}
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~AggregateStatesHolder()
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{
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IAggregateFunction * function = func;
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if (!function->hasTrivialDestructor())
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for (size_t i = 0, s = data.size(); i < s; ++i)
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function->destroy(data[i]);
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}
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/// Захватить владение ареной.
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void addArena(ArenaPtr arena_)
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{
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arenas.push_back(arena_);
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}
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};
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typedef SharedPtr<AggregateStatesHolder> AggregateStatesHolderPtr;
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/** Столбец состояний агрегатных функций.
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*/
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class ColumnAggregateFunction final : public IColumn
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{
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public:
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typedef PODArray<AggregateDataPtr> Container_t;
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private:
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AggregateStatesHolderPtr holder;
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/** Массив (указателей на состояния агрегатных функций) может
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* либо лежать в holder-е (пример - только что созданный столбец со всеми значениями),
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* либо быть своим (пример - столбец отфильтрованных значений - тогда свой массив содержит только то, что отфильтровано).
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*/
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Container_t own_data;
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Container_t * data; /// Указывает на AggregateStatesHolder::data или на own_data.
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public:
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ColumnAggregateFunction(AggregateStatesHolderPtr holder_)
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: holder(holder_), data(&holder->data)
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{
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}
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void set(const AggregateFunctionPtr & func_)
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{
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holder->func = func_;
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}
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AggregateFunctionPtr getAggregateFunction() { return holder->func; }
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AggregateFunctionPtr getAggregateFunction() const { return holder->func; }
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/// Захватить владение ареной.
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void addArena(ArenaPtr arena_)
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{
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holder->addArena(arena_);
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}
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ColumnPtr convertToValues()
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{
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IAggregateFunction * function = holder->func;
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ColumnPtr res = function->getReturnType()->createColumn();
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IColumn & column = *res;
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res->reserve(data->size());
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for (size_t i = 0; i < data->size(); ++i)
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function->insertResultInto((*data)[i], column);
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return res;
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}
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std::string getName() const { return "ColumnAggregateFunction"; }
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size_t sizeOfField() const { return sizeof(own_data[0]); }
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size_t size() const
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{
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return data->size();
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}
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ColumnPtr cloneEmpty() const
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{
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auto res = new ColumnAggregateFunction(const_cast<AggregateStatesHolderPtr &>(holder));
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res->data = &res->own_data;
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return res;
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};
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Field operator[](size_t n) const
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{
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Field field = String();
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{
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WriteBufferFromString buffer(field.get<String &>());
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holder->func->serialize((*data)[n], buffer);
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}
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return field;
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}
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void get(size_t n, Field & res) const
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{
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res = String();
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{
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WriteBufferFromString buffer(res.get<String &>());
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holder->func->serialize((*data)[n], buffer);
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}
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}
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StringRef getDataAt(size_t n) const
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{
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return StringRef((*data)[n], sizeof((*data)[n]));
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}
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/// Объединить состояние в последней строке с заданным
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void insertMerge(StringRef input)
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{
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holder.get()->func.get()->merge(data->back(), input.data);
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}
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void insert(const Field & x)
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{
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if (holder.get()->arenas.empty())
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holder.get()->addArena(new Arena());
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IAggregateFunction * function = holder->func;
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data->push_back(holder.get()->arenas.back()->alloc(function->sizeOfData()));
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function->create(data->back());
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ReadBufferFromString read_buffer(x.get<const String &>());
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function->deserializeMerge(data->back(), read_buffer);
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}
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void insertFrom(const IColumn & src, size_t n)
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{
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/// Должны совпадать holder-ы.
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if (unlikely(holder.get() != static_cast<const ColumnAggregateFunction &>(src).holder.get()))
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throw Exception("Columns with aggregates must hold same data", ErrorCodes::LOGICAL_ERROR);
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data->push_back(static_cast<const ColumnAggregateFunction &>(src).getData()[n]);
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}
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void insertDefault()
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{
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throw Exception("Method insertDefault is not supported for ColumnAggregateFunction.", ErrorCodes::NOT_IMPLEMENTED);
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}
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size_t byteSize() const
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{
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return data->size() * sizeof((*data)[0]);
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}
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void insertData(const char * pos, size_t length)
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{
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data->push_back(*reinterpret_cast<const AggregateDataPtr *>(pos));
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}
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ColumnPtr cut(size_t start, size_t length) const
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{
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if (start + length > data->size())
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throw Exception("Parameters start = "
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+ toString(start) + ", length = "
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+ toString(length) + " are out of bound in ColumnAggregateFunction::cut() method"
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" (data.size() = " + toString(data->size()) + ").",
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ErrorCodes::PARAMETER_OUT_OF_BOUND);
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ColumnPtr res = cloneEmpty();
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ColumnAggregateFunction * res_ = static_cast<ColumnAggregateFunction *>(res.get());
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res_->data->resize(length);
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for (size_t i = 0; i < length; ++i)
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(*res_->data)[i] = (*data)[start + i];
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return res;
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}
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ColumnPtr filter(const Filter & filter) const
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{
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size_t size = data->size();
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if (size != filter.size())
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throw Exception("Size of filter doesn't match size of column.", ErrorCodes::SIZES_OF_COLUMNS_DOESNT_MATCH);
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ColumnPtr res = cloneEmpty();
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ColumnAggregateFunction * res_ = static_cast<ColumnAggregateFunction *>(res.get());
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if (size == 0)
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return res;
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res_->data->reserve(size);
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for (size_t i = 0; i < size; ++i)
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if (filter[i])
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res_->data->push_back((*data)[i]);
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return res;
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}
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ColumnPtr permute(const Permutation & perm, size_t limit) const
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{
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size_t size = data->size();
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if (limit == 0)
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limit = size;
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else
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limit = std::min(size, limit);
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if (perm.size() < limit)
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throw Exception("Size of permutation is less than required.", ErrorCodes::SIZES_OF_COLUMNS_DOESNT_MATCH);
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ColumnPtr res = cloneEmpty();
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ColumnAggregateFunction * res_ = static_cast<ColumnAggregateFunction *>(res.get());
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res_->data->resize(limit);
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for (size_t i = 0; i < limit; ++i)
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(*res_->data)[i] = (*data)[perm[i]];
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return res;
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}
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ColumnPtr replicate(const Offsets_t & offsets) const
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{
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throw Exception("Method replicate is not supported for ColumnAggregateFunction.", ErrorCodes::NOT_IMPLEMENTED);
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}
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void getExtremes(Field & min, Field & max) const
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{
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throw Exception("Method getExtremes is not supported for ColumnAggregateFunction.", ErrorCodes::NOT_IMPLEMENTED);
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}
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int compareAt(size_t n, size_t m, const IColumn & rhs_, int nan_direction_hint) const
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{
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return 0;
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}
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void getPermutation(bool reverse, size_t limit, Permutation & res) const
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{
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size_t s = data->size();
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res.resize(s);
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for (size_t i = 0; i < s; ++i)
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res[i] = i;
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}
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/** Более эффективные методы манипуляции */
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Container_t & getData()
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{
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return *data;
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}
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const Container_t & getData() const
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{
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return *data;
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}
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};
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}
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