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

#pragma once

#include <DB/DataStreams/IBlockInputStream.h>
#include <DB/DataStreams/IRowInputStream.h>


namespace DB
{


/** Преобразует поток для чтения данных по блокам в поток для чтения данных по строкам.
  */
class RowInputStreamFromBlockInputStream : public IRowInputStream
{
public:
	explicit RowInputStreamFromBlockInputStream(BlockInputStreamPtr block_input_);
	bool read(Row & row);

	void readPrefix() { block_input->readPrefix(); };
	void readSuffix() { block_input->readSuffix(); };

	RowInputStreamPtr clone() { return new RowInputStreamFromBlockInputStream(block_input); }

private:
	BlockInputStreamPtr block_input;

	size_t pos;
	size_t current_rows;
	Block current_block;
};

}