ClickHouse/dbms/include/DB/Storages/MergeTree/LevelMergeSelector.h

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#pragma once
#include <DB/Storages/MergeTree/MergeSelector.h>
namespace DB
{
/** Select parts to merge based on its level.
* Select first range of parts of parts_to_merge length with minimum level.
*/
class LevelMergeSelector : public IMergeSelector
{
public:
struct Settings
{
size_t parts_to_merge = 10;
};
LevelMergeSelector(const Settings & settings) : settings(settings) {}
PartsInPartition select(
const Partitions & partitions,
const size_t max_total_size_to_merge) override;
private:
const Settings settings;
};
}