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125 lines
3.5 KiB
C++
125 lines
3.5 KiB
C++
#pragma once
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#include <DB/IO/WriteHelpers.h>
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#include <DB/IO/ReadHelpers.h>
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#include <DB/DataTypes/DataTypesNumberFixed.h>
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#include <DB/AggregateFunctions/IUnaryAggregateFunction.h>
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namespace DB
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{
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template <typename T>
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struct AggregateFunctionSumData
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{
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T sum;
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AggregateFunctionSumData() : sum(0) {}
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};
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/// Считает сумму чисел.
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template <typename T>
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class AggregateFunctionSum : public IUnaryAggregateFunction<AggregateFunctionSumData<typename NearestFieldType<T>::Type> >
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{
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public:
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String getName() const { return "sum"; }
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DataTypePtr getReturnType() const
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{
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return new typename DataTypeFromFieldType<typename NearestFieldType<T>::Type>::Type;
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}
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void setArgument(const DataTypePtr & argument)
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{
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if (!argument->isNumeric())
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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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void addOne(AggregateDataPtr place, const IColumn & column, size_t row_num) const
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{
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this->data(place).sum += static_cast<const ColumnVector<T> &>(column).getData()[row_num];
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}
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void merge(AggregateDataPtr place, ConstAggregateDataPtr rhs) const
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{
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this->data(place).sum += this->data(rhs).sum;
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}
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void serialize(ConstAggregateDataPtr place, WriteBuffer & buf) const
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{
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writeBinary(this->data(place).sum, buf);
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}
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void deserializeMerge(AggregateDataPtr place, ReadBuffer & buf) const
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{
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typename NearestFieldType<T>::Type tmp;
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readBinary(tmp, buf);
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this->data(place).sum += tmp;
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}
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void insertResultInto(ConstAggregateDataPtr place, IColumn & to) const
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{
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static_cast<ColumnVector<typename NearestFieldType<T>::Type> &>(to).getData().push_back(this->data(place).sum);
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}
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};
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/// Считает сумму чисел при выполнении условия. sumIf(x, cond) эквивалентно sum(cond ? x : 0).
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template <typename T>
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class AggregateFunctionSumIf : public IAggregateFunctionHelper<AggregateFunctionSumData<typename NearestFieldType<T>::Type> >
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{
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public:
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String getName() const { return "sumIf"; }
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DataTypePtr getReturnType() const
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{
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return new typename DataTypeFromFieldType<typename NearestFieldType<T>::Type>::Type;
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}
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void setArguments(const DataTypes & arguments)
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{
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if (!arguments[0]->isNumeric())
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throw Exception("Illegal type " + arguments[0]->getName() + " of first argument for aggregate function " + getName(),
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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if (!dynamic_cast<const DataTypeUInt8 *>(&*arguments[1]))
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throw Exception("Illegal type " + arguments[1]->getName() + " of second argument for aggregate function " + getName() + ". Must be UInt8.",
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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}
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void add(AggregateDataPtr place, const IColumn ** columns, size_t row_num) const
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{
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if (static_cast<const ColumnUInt8 &>(*columns[1]).getData()[row_num])
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this->data(place).sum += static_cast<const ColumnVector<T> &>(*columns[0]).getData()[row_num];
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}
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void merge(AggregateDataPtr place, ConstAggregateDataPtr rhs) const
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{
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this->data(place).sum += this->data(rhs).sum;
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}
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void serialize(ConstAggregateDataPtr place, WriteBuffer & buf) const
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{
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writeBinary(this->data(place).sum, buf);
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}
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void deserializeMerge(AggregateDataPtr place, ReadBuffer & buf) const
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{
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typename NearestFieldType<T>::Type tmp;
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readBinary(tmp, buf);
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this->data(place).sum += tmp;
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}
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void insertResultInto(ConstAggregateDataPtr place, IColumn & to) const
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{
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static_cast<ColumnVector<typename NearestFieldType<T>::Type> &>(to).getData().push_back(this->data(place).sum);
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}
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};
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}
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