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28 lines
775 B
C++
28 lines
775 B
C++
#pragma once
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#include <Storages/MergeTree/MergeSelector.h>
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namespace DB
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{
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/** Merge selector, which is used to remove values with expired ttl.
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* It selects parts to merge by greedy algorithm:
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* 1. Finds part with the most earliest expired ttl and includes it to result.
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* 2. Tries to find the longest range of parts with expired ttl, that includes part from step 1.
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*/
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class TTLMergeSelector : public IMergeSelector
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{
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public:
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explicit TTLMergeSelector(time_t current_time_, bool only_drop_parts_) : current_time(current_time_), only_drop_parts(only_drop_parts_) {}
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PartsInPartition select(
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const Partitions & partitions,
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const size_t max_total_size_to_merge) override;
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private:
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time_t current_time;
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bool only_drop_parts;
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};
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}
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