mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-16 20:53:27 +00:00
121 lines
3.2 KiB
C++
121 lines
3.2 KiB
C++
#pragma once
|
||
|
||
#include <DB/Columns/ColumnArray.h>
|
||
#include <DB/DataTypes/DataTypeArray.h>
|
||
#include <DB/DataTypes/DataTypesNumberFixed.h>
|
||
#include <DB/AggregateFunctions/IAggregateFunction.h>
|
||
|
||
|
||
namespace DB
|
||
{
|
||
|
||
|
||
/** Не агрегатная функция, а адаптер агрегатных функций,
|
||
* который любую агрегатную функцию agg(x) делает агрегатной функцией вида aggArray(x).
|
||
* Адаптированная агрегатная функция вычисляет вложенную агрегатную функцию для каждого элемента массива.
|
||
*/
|
||
class AggregateFunctionArray final : public IAggregateFunction
|
||
{
|
||
private:
|
||
AggregateFunctionPtr nested_func_owner;
|
||
IAggregateFunction * nested_func;
|
||
int num_agruments;
|
||
|
||
public:
|
||
AggregateFunctionArray(AggregateFunctionPtr nested_) : nested_func_owner(nested_), nested_func(nested_func_owner.get()) {}
|
||
|
||
String getName() const
|
||
{
|
||
return nested_func->getName() + "Array";
|
||
}
|
||
|
||
DataTypePtr getReturnType() const
|
||
{
|
||
return nested_func->getReturnType();
|
||
}
|
||
|
||
void setArguments(const DataTypes & arguments)
|
||
{
|
||
num_agruments = arguments.size();
|
||
|
||
DataTypes nested_arguments;
|
||
for (int i = 0; i < num_agruments; ++i)
|
||
{
|
||
if (const DataTypeArray * array = typeid_cast<const DataTypeArray *>(&*arguments[i]))
|
||
nested_arguments.push_back(array->getNestedType());
|
||
else
|
||
throw Exception("Illegal type " + arguments[i]->getName() + " of argument #" + toString(i + 1) + " for aggregate function " + getName() + ". Must be array.", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
|
||
}
|
||
nested_func->setArguments(nested_arguments);
|
||
}
|
||
|
||
void setParameters(const Array & params)
|
||
{
|
||
nested_func->setParameters(params);
|
||
}
|
||
|
||
void create(AggregateDataPtr place) const
|
||
{
|
||
nested_func->create(place);
|
||
}
|
||
|
||
void destroy(AggregateDataPtr place) const noexcept
|
||
{
|
||
nested_func->destroy(place);
|
||
}
|
||
|
||
bool hasTrivialDestructor() const
|
||
{
|
||
return nested_func->hasTrivialDestructor();
|
||
}
|
||
|
||
size_t sizeOfData() const
|
||
{
|
||
return nested_func->sizeOfData();
|
||
}
|
||
|
||
size_t alignOfData() const
|
||
{
|
||
return nested_func->alignOfData();
|
||
}
|
||
|
||
void add(AggregateDataPtr place, const IColumn ** columns, size_t row_num) const
|
||
{
|
||
const IColumn * nested[num_agruments];
|
||
|
||
for (int i = 0; i < num_agruments; ++i)
|
||
nested[i] = &static_cast<const ColumnArray &>(*columns[i]).getData();
|
||
|
||
const ColumnArray & first_array_column = static_cast<const ColumnArray &>(*columns[0]);
|
||
const IColumn::Offsets_t & offsets = first_array_column.getOffsets();
|
||
|
||
size_t begin = row_num == 0 ? 0 : offsets[row_num - 1];
|
||
size_t end = offsets[row_num];
|
||
|
||
for (size_t i = begin; i < end; ++i)
|
||
nested_func->add(place, nested, i);
|
||
}
|
||
|
||
void merge(AggregateDataPtr place, ConstAggregateDataPtr rhs) const
|
||
{
|
||
nested_func->merge(place, rhs);
|
||
}
|
||
|
||
void serialize(ConstAggregateDataPtr place, WriteBuffer & buf) const
|
||
{
|
||
nested_func->serialize(place, buf);
|
||
}
|
||
|
||
void deserializeMerge(AggregateDataPtr place, ReadBuffer & buf) const
|
||
{
|
||
nested_func->deserializeMerge(place, buf);
|
||
}
|
||
|
||
void insertResultInto(ConstAggregateDataPtr place, IColumn & to) const
|
||
{
|
||
nested_func->insertResultInto(place, to);
|
||
}
|
||
};
|
||
|
||
}
|