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

#pragma once

#include <DB/DataStreams/IBlockOutputStream.h>
#include <DB/DataStreams/IRowOutputStream.h>


namespace DB
{

/** Преобразует поток для записи данных по строкам в поток для записи данных по блокам.
  * Наример, для записи текстового дампа.
  */
class BlockOutputStreamFromRowOutputStream : public IBlockOutputStream
{
public:
	BlockOutputStreamFromRowOutputStream(RowOutputStreamPtr row_output_);
	void write(const Block & block);
	void writePrefix() { row_output->writePrefix(); }
	void writeSuffix() { row_output->writeSuffix(); }
	
	void setRowsBeforeLimit(size_t rows_before_limit);
	void setTotals(const Block & totals);
	void setExtremes(const Block & extremes);

private:
	RowOutputStreamPtr row_output;
	bool first_row;
};

}