mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-10-07 00:50:56 +00:00
49 lines
1.3 KiB
C++
49 lines
1.3 KiB
C++
#pragma once
|
|
#include "MergeTreeBaseBlockInputStream.h"
|
|
|
|
|
|
namespace DB
|
|
{
|
|
|
|
class MergeTreeReadPool;
|
|
|
|
|
|
/** Used in conjunction with MergeTreeReadPool, asking it for more work to do and performing whatever reads it is asked
|
|
* to perform.
|
|
*/
|
|
class MergeTreeThreadBlockInputStream : public MergeTreeBaseBlockInputStream
|
|
{
|
|
public:
|
|
MergeTreeThreadBlockInputStream(
|
|
const size_t thread,
|
|
const std::shared_ptr<MergeTreeReadPool> & pool,
|
|
const size_t min_marks_to_read,
|
|
const size_t max_block_size,
|
|
size_t preferred_block_size_bytes,
|
|
size_t preferred_max_column_in_block_size_bytes,
|
|
MergeTreeData & storage,
|
|
const bool use_uncompressed_cache,
|
|
const ExpressionActionsPtr & prewhere_actions,
|
|
const String & prewhere_column,
|
|
const Settings & settings,
|
|
const Names & virt_column_names);
|
|
|
|
String getName() const override { return "MergeTreeThread"; }
|
|
|
|
String getID() const override;
|
|
|
|
~MergeTreeThreadBlockInputStream() override;
|
|
|
|
protected:
|
|
/// Requests read task from MergeTreeReadPool and signals whether it got one
|
|
bool getNewTask() override;
|
|
|
|
/// "thread" index (there are N threads and each thread is assigned index in interval [0..N-1])
|
|
size_t thread;
|
|
|
|
std::shared_ptr<MergeTreeReadPool> pool;
|
|
size_t min_marks_to_read;
|
|
};
|
|
|
|
}
|