ClickHouse/dbms/include/DB/DataStreams/VerticalRowOutputStream.h

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#pragma once
#include <Poco/SharedPtr.h>
#include <DB/Core/Block.h>
#include <DB/Core/Names.h>
#include <DB/IO/WriteBuffer.h>
#include <DB/DataStreams/IRowOutputStream.h>
namespace DB
{
using Poco::SharedPtr;
/** Поток для вывода данных в формате "каждое значение на своей строке".
*/
class VerticalRowOutputStream : public IRowOutputStream
{
public:
VerticalRowOutputStream(WriteBuffer & ostr_, const Block & sample_);
void writeField(const IColumn & column, const IDataType & type, size_t row_num) override;
void writeRowStartDelimiter() override;
void writeRowBetweenDelimiter() override;
void flush() override { ostr.next(); }
protected:
virtual void writeValue(const IColumn & column, const IDataType & type, size_t row_num) const;
WriteBuffer & ostr;
const Block sample;
Names names;
size_t field_number;
size_t row_number;
typedef std::vector<String> Pads_t;
Pads_t pads;
};
/** То же самое, но строки выводятся без экранирования.
*/
class VerticalRawRowOutputStream : public VerticalRowOutputStream
{
public:
VerticalRawRowOutputStream(WriteBuffer & ostr_, const Block & sample_)
: VerticalRowOutputStream(ostr_, sample_) {}
protected:
void writeValue(const IColumn & column, const IDataType & type, size_t row_num) const override;
};
}