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69 lines
2.5 KiB
C++
69 lines
2.5 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 wide format data of each column is stored in one or several (for complex types) files.
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* Every data file is followed by marks file.
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* Can be used in tables with both adaptive and non-adaptive granularity.
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* This is the regular format of parts for MergeTree and suitable for big parts, as it's the most efficient.
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* Data part would be created in wide format if it's uncompressed size in bytes or number of rows would exceed
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* thresholds `min_bytes_for_wide_part` and `min_rows_for_wide_part`.
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*/
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class MergeTreeDataPartWide : public IMergeTreeDataPart
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{
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public:
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MergeTreeDataPartWide(
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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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MergeTreeDataPartWide(
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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 supportsVerticalMerge() const override { return true; }
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String getFileNameForColumn(const NameAndTypePair & column) const override;
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~MergeTreeDataPartWide() override;
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bool hasColumnFiles(const String & column, const IDataType & type) const 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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ColumnSize getColumnSizeImpl(const String & name, const IDataType & type, std::unordered_set<String> * processed_substreams) const;
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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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