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119 lines
3.2 KiB
C++
119 lines
3.2 KiB
C++
#pragma once
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#include <DB/DataTypes/DataTypeAggregateFunction.h>
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#include <DB/AggregateFunctions/IAggregateFunction.h>
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#include <DB/Columns/ColumnAggregateFunction.h>
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namespace DB
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{
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/** Не агрегатная функция, а адаптер агрегатных функций,
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* Агрегатные функции с суффиксом State отличаются от соответствующих тем, что их состояния не финализируются.
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* Возвращаемый тип - DataTypeAggregateFunction.
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*/
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class AggregateFunctionState final : public IAggregateFunction
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{
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private:
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AggregateFunctionPtr nested_func_owner;
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IAggregateFunction * nested_func;
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DataTypes arguments;
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Array params;
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public:
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AggregateFunctionState(AggregateFunctionPtr nested_) : nested_func_owner(nested_), nested_func(nested_func_owner.get()) {}
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String getName() const override
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{
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return nested_func->getName() + "State";
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}
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DataTypePtr getReturnType() const override
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{
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return std::make_shared<DataTypeAggregateFunction>(nested_func_owner, arguments, params);
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}
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void setArguments(const DataTypes & arguments_) override
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{
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arguments = arguments_;
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nested_func->setArguments(arguments);
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}
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void setParameters(const Array & params_) override
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{
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params = params_;
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nested_func->setParameters(params);
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}
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void create(AggregateDataPtr place) const override
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{
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nested_func->create(place);
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}
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void destroy(AggregateDataPtr place) const noexcept override
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{
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nested_func->destroy(place);
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}
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bool hasTrivialDestructor() const override
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{
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return nested_func->hasTrivialDestructor();
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}
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size_t sizeOfData() const override
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{
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return nested_func->sizeOfData();
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}
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size_t alignOfData() const override
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{
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return nested_func->alignOfData();
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}
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void add(AggregateDataPtr place, const IColumn ** columns, size_t row_num, Arena * arena) const override
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{
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nested_func->add(place, columns, row_num, arena);
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}
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void merge(AggregateDataPtr place, ConstAggregateDataPtr rhs, Arena * arena) const override
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{
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nested_func->merge(place, rhs, arena);
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}
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void serialize(ConstAggregateDataPtr place, WriteBuffer & buf) const override
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{
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nested_func->serialize(place, buf);
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}
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void deserialize(AggregateDataPtr place, ReadBuffer & buf, Arena * arena) const override
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{
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nested_func->deserialize(place, buf, arena);
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}
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void insertResultInto(ConstAggregateDataPtr place, IColumn & to) const override
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{
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static_cast<ColumnAggregateFunction &>(to).getData().push_back(const_cast<AggregateDataPtr>(place));
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}
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/// Аггрегатная функция или состояние аггрегатной функции.
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bool isState() const override { return true; }
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bool allocatesMemoryInArena() const override
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{
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return nested_func->allocatesMemoryInArena();
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}
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AggregateFunctionPtr getNestedFunction() const { return nested_func_owner; }
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static void addFree(const IAggregateFunction * that, AggregateDataPtr place, const IColumn ** columns, size_t row_num, Arena * arena)
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{
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static_cast<const AggregateFunctionState &>(*that).add(place, columns, row_num, arena);
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}
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IAggregateFunction::AddFunc getAddressOfAddFunction() const override final { return &addFree; }
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};
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}
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