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108 lines
3.0 KiB
C++
108 lines
3.0 KiB
C++
#pragma once
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#include <DataTypes/DataTypeAggregateFunction.h>
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#include <AggregateFunctions/IAggregateFunction.h>
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#include <Columns/ColumnAggregateFunction.h>
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#include <Common/typeid_cast.h>
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#include <Common/assert_cast.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int ILLEGAL_TYPE_OF_ARGUMENT;
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}
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/** Not an aggregate function, but an adapter of aggregate functions,
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* Aggregate functions with the `Merge` suffix accept `DataTypeAggregateFunction` as an argument
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* (state of the aggregate function obtained earlier using the aggregate function with the `State` suffix)
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* and combine them with aggregation.
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*/
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class AggregateFunctionMerge final : public IAggregateFunctionHelper<AggregateFunctionMerge>
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{
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private:
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AggregateFunctionPtr nested_func;
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public:
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AggregateFunctionMerge(const AggregateFunctionPtr & nested_, const DataTypePtr & argument)
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: IAggregateFunctionHelper<AggregateFunctionMerge>({argument}, nested_->getParameters())
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, nested_func(nested_)
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{
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const DataTypeAggregateFunction * data_type = typeid_cast<const DataTypeAggregateFunction *>(argument.get());
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if (!data_type || data_type->getFunctionName() != nested_func->getName())
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throw Exception("Illegal type " + argument->getName() + " of argument for aggregate function " + getName(),
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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}
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String getName() const override
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{
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return nested_func->getName() + "Merge";
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}
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DataTypePtr getReturnType() const override
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{
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return nested_func->getReturnType();
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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->merge(place, assert_cast<const ColumnAggregateFunction &>(*columns[0]).getData()[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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nested_func->insertResultInto(place, to);
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}
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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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};
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}
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