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64 lines
2.6 KiB
C++
64 lines
2.6 KiB
C++
#pragma once
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#include <base/types.h>
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#include <Disks/IDisk.h>
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#include <IO/WriteBuffer.h>
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#include <Storages/KeyDescription.h>
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#include <Storages/MergeTree/IPartMetadataManager.h>
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#include <Core/Field.h>
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namespace DB
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{
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class Block;
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class MergeTreeData;
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struct FormatSettings;
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struct MergeTreeDataPartChecksums;
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struct StorageInMemoryMetadata;
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class IDataPartStorageBuilder;
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using StorageMetadataPtr = std::shared_ptr<const StorageInMemoryMetadata>;
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using DataPartStorageBuilderPtr = std::shared_ptr<IDataPartStorageBuilder>;
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/// This class represents a partition value of a single part and encapsulates its loading/storing logic.
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struct MergeTreePartition
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{
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Row value;
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public:
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MergeTreePartition() = default;
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explicit MergeTreePartition(Row value_) : value(std::move(value_)) {}
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/// For month-based partitioning.
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explicit MergeTreePartition(UInt32 yyyymm) : value(1, yyyymm) {}
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String getID(const MergeTreeData & storage) const;
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String getID(const Block & partition_key_sample) const;
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static std::optional<Row> tryParseValueFromID(const String & partition_id, const Block & partition_key_sample);
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void serializeText(const MergeTreeData & storage, WriteBuffer & out, const FormatSettings & format_settings) const;
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void load(const MergeTreeData & storage, const PartMetadataManagerPtr & manager);
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/// Store functions return write buffer with written but not finalized data.
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/// User must call finish() for returned object.
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[[nodiscard]] std::unique_ptr<WriteBufferFromFileBase> store(const MergeTreeData & storage, const DataPartStorageBuilderPtr & data_part_storage_builder, MergeTreeDataPartChecksums & checksums) const;
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[[nodiscard]] std::unique_ptr<WriteBufferFromFileBase> store(const Block & partition_key_sample, const DataPartStorageBuilderPtr & data_part_storage_builder, MergeTreeDataPartChecksums & checksums, const WriteSettings & settings) const;
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void assign(const MergeTreePartition & other) { value = other.value; }
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void create(const StorageMetadataPtr & metadata_snapshot, Block block, size_t row, ContextPtr context);
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static void appendFiles(const MergeTreeData & storage, Strings & files);
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/// Adjust partition key and execute its expression on block. Return sample block according to used expression.
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static NamesAndTypesList executePartitionByExpression(const StorageMetadataPtr & metadata_snapshot, Block & block, ContextPtr context);
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/// Make a modified partition key with substitution from modulo to moduloLegacy. Used in paritionPruner.
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static KeyDescription adjustPartitionKey(const StorageMetadataPtr & metadata_snapshot, ContextPtr context);
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};
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}
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