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40 lines
1.4 KiB
C++
40 lines
1.4 KiB
C++
#pragma once
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#include <cstddef>
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#include <Core/Settings.h>
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namespace DB
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{
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struct MergeTreeReaderSettings
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{
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size_t min_bytes_to_use_direct_io = 0;
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size_t min_bytes_to_use_mmap_io = 0;
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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;
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};
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struct MergeTreeWriterSettings
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{
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MergeTreeWriterSettings(const Settings & global_settings, bool can_use_adaptive_granularity_,
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size_t aio_threshold_, bool blocks_are_granules_size_ = false)
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: min_compress_block_size(global_settings.min_compress_block_size)
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, max_compress_block_size(global_settings.min_compress_block_size)
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, aio_threshold(aio_threshold_)
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, can_use_adaptive_granularity(can_use_adaptive_granularity_)
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, blocks_are_granules_size(blocks_are_granules_size_) {}
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size_t min_compress_block_size;
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size_t max_compress_block_size;
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size_t aio_threshold;
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bool can_use_adaptive_granularity;
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bool blocks_are_granules_size;
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/// true if we write temporary files during alter.
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bool is_writing_temp_files = false;
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size_t estimated_size = 0;
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/// used when ALTERing columns if we know that array offsets are not altered.
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bool skip_offsets = false;
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};
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}
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