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71 lines
2.7 KiB
C++
71 lines
2.7 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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class UncompressedCache;
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class MergeTreeDataPartInMemory : public IMergeTreeDataPart
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{
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public:
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MergeTreeDataPartInMemory(
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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 VolumePtr & volume_,
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const std::optional<String> & relative_path_ = {},
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const IMergeTreeDataPart * parent_part_ = nullptr);
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MergeTreeDataPartInMemory(
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MergeTreeData & storage_,
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const String & name_,
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const VolumePtr & volume_,
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const std::optional<String> & relative_path_ = {},
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const IMergeTreeDataPart * parent_part_ = nullptr);
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MergeTreeReaderPtr getReader(
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const NamesAndTypesList & columns,
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const StorageMetadataPtr & metadata_snapshot,
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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 StorageMetadataPtr & metadata_snapshot,
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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 false; }
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bool isStoredOnRemoteDisk() const override { return false; }
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bool hasColumnFiles(const NameAndTypePair & column) const override { return !!getColumnPosition(column.getNameInStorage()); }
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String getFileNameForColumn(const NameAndTypePair & /* column */) const override { return ""; }
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void renameTo(const String & new_relative_path, bool remove_new_dir_if_exists) const override;
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void makeCloneInDetached(const String & prefix, const StorageMetadataPtr & metadata_snapshot) const override;
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void flushToDisk(const String & base_path, const String & new_relative_path, const StorageMetadataPtr & metadata_snapshot) const;
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/// Returns hash of parts's block
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Checksum calculateBlockChecksum() const;
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mutable Block block;
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private:
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mutable std::condition_variable is_merged;
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/// Calculates uncompressed sizes in memory.
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void calculateEachColumnSizes(ColumnSizeByName & each_columns_size, ColumnSize & total_size) const override;
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};
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using DataPartInMemoryPtr = std::shared_ptr<const MergeTreeDataPartInMemory>;
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DataPartInMemoryPtr asInMemoryPart(const MergeTreeDataPartPtr & part);
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}
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