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73 lines
2.5 KiB
C++
73 lines
2.5 KiB
C++
#include <AggregateFunctions/AggregateFunctionFactory.h>
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#include <AggregateFunctions/AggregateFunctionSum.h>
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#include <AggregateFunctions/Helpers.h>
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#include <AggregateFunctions/FactoryHelpers.h>
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namespace DB
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{
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namespace
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{
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template <typename T>
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struct SumSimple
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{
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/// @note It uses slow Decimal128 (cause we need such a variant). sumWithOverflow is faster for Decimal32/64
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using ResultType = std::conditional_t<IsDecimalNumber<T>, Decimal128, typename NearestFieldType<T>::Type>;
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using AggregateDataType = AggregateFunctionSumData<ResultType>;
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using Function = AggregateFunctionSum<T, ResultType, AggregateDataType>;
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};
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template <typename T>
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struct SumSameType
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{
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using ResultType = T;
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using AggregateDataType = AggregateFunctionSumData<ResultType>;
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using Function = AggregateFunctionSum<T, ResultType, AggregateDataType>;
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};
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template <typename T>
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struct SumKahan
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{
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using ResultType = Float64;
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using AggregateDataType = AggregateFunctionSumKahanData<ResultType>;
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using Function = AggregateFunctionSum<T, ResultType, AggregateDataType>;
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};
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template <typename T> using AggregateFunctionSumSimple = typename SumSimple<T>::Function;
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template <typename T> using AggregateFunctionSumWithOverflow = typename SumSameType<T>::Function;
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template <typename T> using AggregateFunctionSumKahan =
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std::conditional_t<IsDecimalNumber<T>, typename SumSimple<T>::Function, typename SumKahan<T>::Function>;
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template <template <typename> class Function>
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AggregateFunctionPtr createAggregateFunctionSum(const std::string & name, const DataTypes & argument_types, const Array & parameters)
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{
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assertNoParameters(name, parameters);
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assertUnary(name, argument_types);
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AggregateFunctionPtr res;
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DataTypePtr data_type = argument_types[0];
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if (isDecimal(data_type))
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res.reset(createWithDecimalType<Function>(*data_type));
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else
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res.reset(createWithNumericType<Function>(*data_type));
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if (!res)
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throw Exception("Illegal type " + argument_types[0]->getName() + " of argument for aggregate function " + name,
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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return res;
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}
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}
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void registerAggregateFunctionSum(AggregateFunctionFactory & factory)
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{
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factory.registerFunction("sum", createAggregateFunctionSum<AggregateFunctionSumSimple>, AggregateFunctionFactory::CaseInsensitive);
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factory.registerFunction("sumWithOverflow", createAggregateFunctionSum<AggregateFunctionSumWithOverflow>);
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factory.registerFunction("sumKahan", createAggregateFunctionSum<AggregateFunctionSumKahan>);
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}
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}
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