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42 lines
1.2 KiB
C++
42 lines
1.2 KiB
C++
#pragma once
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#include <DB/IO/WriteHelpers.h>
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#include <DB/AggregateFunctions/IAggregateFunction.h>
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namespace DB
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{
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template <typename T, typename Derived>
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class IBinaryAggregateFunction : public IAggregateFunctionHelper<T>
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{
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private:
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Derived & getDerived() { return static_cast<Derived &>(*this); }
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const Derived & getDerived() const { return static_cast<const Derived &>(*this); }
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public:
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void setArguments(const DataTypes & arguments) override final
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{
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if (arguments.size() != 2)
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throw Exception{
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"Passed " + toString(arguments.size()) + " arguments to binary aggregate function " + this->getName(),
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH
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};
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getDerived().setArgumentsImpl(arguments);
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}
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void add(AggregateDataPtr place, const IColumn ** columns, const size_t row_num) const override final
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{
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getDerived().addImpl(place, *columns[0], *columns[1], row_num);
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}
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static void addFree(const IAggregateFunction * that, AggregateDataPtr place, const IColumn ** columns, size_t row_num)
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{
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return static_cast<const Derived &>(*that).addImpl(place, *columns[0], *columns[1], row_num);
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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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