mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-17 21:24:28 +00:00
47 lines
1.5 KiB
C++
47 lines
1.5 KiB
C++
#pragma once
|
|
|
|
#include <DataStreams/IBlockOutputStream.h>
|
|
#include <Core/Types.h>
|
|
#include <DataTypes/IDataType.h>
|
|
|
|
namespace DB
|
|
{
|
|
|
|
class WriteBuffer;
|
|
class CompressedWriteBuffer;
|
|
|
|
|
|
/** Serializes the stream of blocks in their native binary format (with names and column types).
|
|
* Designed for communication between servers.
|
|
*
|
|
* A stream can be specified to write the index. The index contains offsets to each part of each column.
|
|
* If an `append` is made to an existing file, and you need to write the index, then specify `initial_size_of_file`.
|
|
*/
|
|
class NativeBlockOutputStream : public IBlockOutputStream
|
|
{
|
|
public:
|
|
/** If non-zero client_revision is specified, additional block information can be written.
|
|
*/
|
|
NativeBlockOutputStream(
|
|
WriteBuffer & ostr_, UInt64 client_revision_ = 0,
|
|
WriteBuffer * index_ostr_ = nullptr, size_t initial_size_of_file_ = 0);
|
|
|
|
void write(const Block & block) override;
|
|
void flush() override;
|
|
|
|
static void writeData(const IDataType & type, const ColumnPtr & column, WriteBuffer & ostr, size_t offset, size_t limit);
|
|
|
|
String getContentType() const override { return "application/octet-stream"; }
|
|
|
|
private:
|
|
WriteBuffer & ostr;
|
|
UInt64 client_revision;
|
|
|
|
WriteBuffer * index_ostr;
|
|
size_t initial_size_of_file; /// The initial size of the data file, if `append` done. Used for the index.
|
|
/// If you need to write index, then `ostr` must be a CompressedWriteBuffer.
|
|
CompressedWriteBuffer * ostr_concrete = nullptr;
|
|
};
|
|
|
|
}
|