mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-18 13:42:02 +00:00
121 lines
3.5 KiB
C++
121 lines
3.5 KiB
C++
#pragma once
|
||
|
||
#include <DB/DataTypes/DataTypeAggregateFunction.h>
|
||
#include <DB/AggregateFunctions/IAggregateFunction.h>
|
||
#include <DB/Columns/ColumnAggregateFunction.h>
|
||
|
||
|
||
namespace DB
|
||
{
|
||
|
||
|
||
/** Не агрегатная функция, а адаптер агрегатных функций,
|
||
* Агрегатные функции с суффиксом Merge принимают в качестве аргумента DataTypeAggregateFunction
|
||
* (состояние агрегатной функции, полученное ранее с помощью применения агрегатной функции с суффиксом State)
|
||
* и объединяют их при агрегации.
|
||
*/
|
||
|
||
class AggregateFunctionMerge final : public IAggregateFunction
|
||
{
|
||
private:
|
||
AggregateFunctionPtr nested_func_owner;
|
||
IAggregateFunction * nested_func;
|
||
|
||
public:
|
||
AggregateFunctionMerge(AggregateFunctionPtr nested_) : nested_func_owner(nested_), nested_func(nested_func_owner.get()) {}
|
||
|
||
String getName() const override
|
||
{
|
||
return nested_func->getName() + "Merge";
|
||
}
|
||
|
||
DataTypePtr getReturnType() const override
|
||
{
|
||
return nested_func->getReturnType();
|
||
}
|
||
|
||
void setArguments(const DataTypes & arguments) override
|
||
{
|
||
if (arguments.size() != 1)
|
||
throw Exception("Passed " + toString(arguments.size()) + " arguments to unary aggregate function " + this->getName(),
|
||
ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
|
||
|
||
const DataTypeAggregateFunction * data_type = typeid_cast<const DataTypeAggregateFunction *>(&*arguments[0]);
|
||
|
||
if (!data_type || data_type->getFunctionName() != nested_func->getName())
|
||
throw Exception("Illegal type " + arguments[0]->getName() + " of argument for aggregate function " + getName(),
|
||
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
|
||
|
||
nested_func->setArguments(data_type->getArgumentsDataTypes());
|
||
}
|
||
|
||
void setParameters(const Array & params) override
|
||
{
|
||
nested_func->setParameters(params);
|
||
}
|
||
|
||
void create(AggregateDataPtr place) const override
|
||
{
|
||
nested_func->create(place);
|
||
}
|
||
|
||
void destroy(AggregateDataPtr place) const noexcept override
|
||
{
|
||
nested_func->destroy(place);
|
||
}
|
||
|
||
bool hasTrivialDestructor() const override
|
||
{
|
||
return nested_func->hasTrivialDestructor();
|
||
}
|
||
|
||
size_t sizeOfData() const override
|
||
{
|
||
return nested_func->sizeOfData();
|
||
}
|
||
|
||
size_t alignOfData() const override
|
||
{
|
||
return nested_func->alignOfData();
|
||
}
|
||
|
||
void add(AggregateDataPtr place, const IColumn ** columns, size_t row_num, Arena * arena) const override
|
||
{
|
||
nested_func->merge(place, static_cast<const ColumnAggregateFunction &>(*columns[0]).getData()[row_num], arena);
|
||
}
|
||
|
||
void merge(AggregateDataPtr place, ConstAggregateDataPtr rhs, Arena * arena) const override
|
||
{
|
||
nested_func->merge(place, rhs, arena);
|
||
}
|
||
|
||
void serialize(ConstAggregateDataPtr place, WriteBuffer & buf) const override
|
||
{
|
||
nested_func->serialize(place, buf);
|
||
}
|
||
|
||
void deserialize(AggregateDataPtr place, ReadBuffer & buf, Arena * arena) const override
|
||
{
|
||
nested_func->deserialize(place, buf, arena);
|
||
}
|
||
|
||
void insertResultInto(ConstAggregateDataPtr place, IColumn & to) const override
|
||
{
|
||
nested_func->insertResultInto(place, to);
|
||
}
|
||
|
||
bool allocatesMemoryInArena() const override
|
||
{
|
||
return nested_func->allocatesMemoryInArena();
|
||
}
|
||
|
||
static void addFree(const IAggregateFunction * that, AggregateDataPtr place, const IColumn ** columns, size_t row_num, Arena * arena)
|
||
{
|
||
static_cast<const AggregateFunctionMerge &>(*that).add(place, columns, row_num, arena);
|
||
}
|
||
|
||
IAggregateFunction::AddFunc getAddressOfAddFunction() const override final { return &addFree; }
|
||
};
|
||
|
||
}
|