mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-24 00:22:29 +00:00
46 lines
1.1 KiB
C++
46 lines
1.1 KiB
C++
#pragma once
|
||
|
||
#include <Yandex/logger_useful.h>
|
||
|
||
#include <DB/Core/SortDescription.h>
|
||
|
||
#include <DB/DataStreams/IProfilingBlockInputStream.h>
|
||
|
||
|
||
namespace DB
|
||
{
|
||
|
||
/** Соединяет поток сортированных по отдельности блоков в сортированный целиком поток.
|
||
*/
|
||
class MergeSortingBlockInputStream : public IProfilingBlockInputStream
|
||
{
|
||
public:
|
||
MergeSortingBlockInputStream(BlockInputStreamPtr input_, SortDescription & description_)
|
||
: input(input_), description(description_), has_been_read(false), log(&Logger::get("MergeSortingBlockInputStream"))
|
||
{
|
||
children.push_back(input);
|
||
}
|
||
|
||
String getName() const { return "MergeSortingBlockInputStream"; }
|
||
|
||
BlockInputStreamPtr clone() { return new MergeSortingBlockInputStream(input, description); }
|
||
|
||
protected:
|
||
Block readImpl();
|
||
|
||
private:
|
||
BlockInputStreamPtr input;
|
||
SortDescription description;
|
||
|
||
/// Всё было прочитано.
|
||
bool has_been_read;
|
||
|
||
Logger * log;
|
||
|
||
/** Слить сразу много блоков с помощью priority queue.
|
||
*/
|
||
Block merge(Blocks & blocks);
|
||
};
|
||
|
||
}
|