ClickHouse/src/Storages/MergeTree/MergeTreeIOSettings.h

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#pragma once
#include <cstddef>
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#include <Core/Settings.h>
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namespace DB
{
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struct MergeTreeReaderSettings
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{
size_t min_bytes_to_use_direct_io = 0;
size_t min_bytes_to_use_mmap_io = 0;
size_t max_read_buffer_size = DBMS_DEFAULT_BUFFER_SIZE;
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/// If save_marks_in_cache is false, then, if marks are not in cache,
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/// we will load them but won't save in the cache, to avoid evicting other data.
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bool save_marks_in_cache = false;
};
struct MergeTreeWriterSettings
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{
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MergeTreeWriterSettings() = default;
MergeTreeWriterSettings(const Settings & global_settings, bool can_use_adaptive_granularity_,
size_t aio_threshold_, bool blocks_are_granules_size_ = false)
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: min_compress_block_size(global_settings.min_compress_block_size)
, max_compress_block_size(global_settings.max_compress_block_size)
, aio_threshold(aio_threshold_)
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, can_use_adaptive_granularity(can_use_adaptive_granularity_)
, blocks_are_granules_size(blocks_are_granules_size_) {}
size_t min_compress_block_size;
size_t max_compress_block_size;
size_t aio_threshold;
bool can_use_adaptive_granularity;
bool blocks_are_granules_size;
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/// true if we write temporary files during alter.
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size_t estimated_size = 0;
};
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}