1 | #pragma once |
2 | |
3 | #include <Storages/MergeTree/MergeSelector.h> |
4 | |
5 | |
6 | namespace DB |
7 | { |
8 | |
9 | /** Select parts to merge based on its level. |
10 | * Select first range of parts of parts_to_merge length with minimum level. |
11 | */ |
12 | class LevelMergeSelector : public IMergeSelector |
13 | { |
14 | public: |
15 | struct Settings |
16 | { |
17 | size_t parts_to_merge = 10; |
18 | }; |
19 | |
20 | explicit LevelMergeSelector(const Settings & settings_) : settings(settings_) {} |
21 | |
22 | PartsInPartition select( |
23 | const Partitions & partitions, |
24 | const size_t max_total_size_to_merge) override; |
25 | |
26 | private: |
27 | const Settings settings; |
28 | }; |
29 | |
30 | } |
31 | |