mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-10-22 00:10:52 +00:00
67 lines
2.1 KiB
C++
67 lines
2.1 KiB
C++
#pragma once
|
|
|
|
#include <DB/AggregateFunctions/IAggregateFunction.h>
|
|
|
|
#include <DB/DataTypes/IDataType.h>
|
|
|
|
|
|
namespace DB
|
|
{
|
|
|
|
using Poco::SharedPtr;
|
|
|
|
/** Тип - состояние агрегатной функции.
|
|
* Параметры типа - это агрегатная функция и типы её аргументов.
|
|
*/
|
|
class DataTypeAggregateFunction : public IDataType
|
|
{
|
|
private:
|
|
AggregateFunctionPtr function;
|
|
DataTypes argument_types;
|
|
|
|
public:
|
|
DataTypeAggregateFunction(const AggregateFunctionPtr & function_, const DataTypes & argument_types_)
|
|
: function(function_), argument_types(argument_types_)
|
|
{
|
|
function->setArguments(argument_types);
|
|
}
|
|
|
|
std::string getName() const
|
|
{
|
|
std::stringstream stream;
|
|
stream << "AggregateFunction(" << function->getName();
|
|
|
|
for (DataTypes::const_iterator it = argument_types.begin(); it != argument_types.end(); ++it)
|
|
stream << ", " << (*it)->getName();
|
|
|
|
stream << ")";
|
|
return stream.str();
|
|
}
|
|
|
|
DataTypePtr clone() const { return new DataTypeAggregateFunction(function, argument_types); }
|
|
|
|
void serializeBinary(const Field & field, WriteBuffer & ostr) const;
|
|
void deserializeBinary(Field & field, ReadBuffer & istr) const;
|
|
void serializeBinary(const IColumn & column, WriteBuffer & ostr, size_t offset = 0, size_t limit = 0) const;
|
|
void deserializeBinary(IColumn & column, ReadBuffer & istr, size_t limit) const;
|
|
void serializeText(const Field & field, WriteBuffer & ostr) const;
|
|
void deserializeText(Field & field, ReadBuffer & istr) const;
|
|
void serializeTextEscaped(const Field & field, WriteBuffer & ostr) const;
|
|
void deserializeTextEscaped(Field & field, ReadBuffer & istr) const;
|
|
void serializeTextQuoted(const Field & field, WriteBuffer & ostr) const;
|
|
void deserializeTextQuoted(Field & field, ReadBuffer & istr) const;
|
|
void serializeTextJSON(const Field & field, WriteBuffer & ostr) const;
|
|
|
|
ColumnPtr createColumn() const;
|
|
ColumnPtr createConstColumn(size_t size, const Field & field) const;
|
|
|
|
Field getDefault() const
|
|
{
|
|
throw Exception("There is no default value for AggregateFunction data type", ErrorCodes::THERE_IS_NO_DEFAULT_VALUE);
|
|
}
|
|
};
|
|
|
|
|
|
}
|
|
|