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74 lines
2.8 KiB
C++
74 lines
2.8 KiB
C++
#pragma once
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#include <Storages/MergeTree/IMergeTreeDataPart.h>
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namespace DB
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{
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/** In compact format all columns are stored in one file (`data.bin`).
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* Data is splitted in granules and columns are serialized sequentially in one granule.
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* Granules are written one by one in data file.
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* Marks are also stored in single file (`data.mrk3`).
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* In compact format one mark is an array of marks for every column and a number of rows in granule.
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* Format of other data part files is not changed.
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* It's considered to store only small parts in compact format (up to 10M).
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* NOTE: Compact parts aren't supported for tables with non-adaptive granularty.
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* NOTE: In compact part compressed and uncompressed size of single column is unknown.
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*/
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class MergeTreeDataPartCompact : public IMergeTreeDataPart
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{
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public:
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static constexpr auto DATA_FILE_NAME = "data";
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static constexpr auto DATA_FILE_EXTENSION = ".bin";
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static constexpr auto TEMP_FILE_SUFFIX = "_temp";
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static constexpr auto DATA_FILE_NAME_WITH_EXTENSION = "data.bin";
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MergeTreeDataPartCompact(
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const MergeTreeData & storage_,
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const String & name_,
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const MergeTreePartInfo & info_,
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const DiskPtr & disk_,
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const std::optional<String> & relative_path_ = {});
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MergeTreeDataPartCompact(
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MergeTreeData & storage_,
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const String & name_,
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const DiskPtr & disk_,
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const std::optional<String> & relative_path_ = {});
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MergeTreeReaderPtr getReader(
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const NamesAndTypesList & columns,
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const MarkRanges & mark_ranges,
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UncompressedCache * uncompressed_cache,
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MarkCache * mark_cache,
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const MergeTreeReaderSettings & reader_settings_,
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const ValueSizeMap & avg_value_size_hints,
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const ReadBufferFromFileBase::ProfileCallback & profile_callback) const override;
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MergeTreeWriterPtr getWriter(
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const NamesAndTypesList & columns_list,
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const std::vector<MergeTreeIndexPtr> & indices_to_recalc,
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const CompressionCodecPtr & default_codec_,
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const MergeTreeWriterSettings & writer_settings,
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const MergeTreeIndexGranularity & computed_index_granularity) const override;
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bool isStoredOnDisk() const override { return true; }
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bool hasColumnFiles(const String & column_name, const IDataType & type) const override;
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String getFileNameForColumn(const NameAndTypePair & /* column */) const override { return DATA_FILE_NAME; }
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~MergeTreeDataPartCompact() override;
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private:
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void checkConsistency(bool require_part_metadata) const override;
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/// Loads marks index granularity into memory
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void loadIndexGranularity() override;
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/// Compact parts doesn't support per column size, only total size
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void calculateEachColumnSizesOnDisk(ColumnSizeByName & each_columns_size, ColumnSize & total_size) const override;
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};
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}
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