ClickHouse/src/Storages/MergeTree/MergeTreePartition.h

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#pragma once
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#include <base/types.h>
#include <Disks/IDisk.h>
#include <IO/WriteBuffer.h>
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#include <Storages/KeyDescription.h>
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#include <Storages/MergeTree/PartMetaCache.h>
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#include <Core/Field.h>
namespace DB
{
class Block;
class MergeTreeData;
struct FormatSettings;
struct MergeTreeDataPartChecksums;
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struct StorageInMemoryMetadata;
using StorageMetadataPtr = std::shared_ptr<const StorageInMemoryMetadata>;
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/// This class represents a partition value of a single part and encapsulates its loading/storing logic.
struct MergeTreePartition
{
Row value;
public:
MergeTreePartition() = default;
explicit MergeTreePartition(Row value_) : value(std::move(value_)) {}
/// For month-based partitioning.
explicit MergeTreePartition(UInt32 yyyymm) : value(1, yyyymm) {}
String getID(const MergeTreeData & storage) const;
String getID(const Block & partition_key_sample) const;
static std::optional<Row> tryParseValueFromID(const String & partition_id, const Block & partition_key_sample);
void serializeText(const MergeTreeData & storage, WriteBuffer & out, const FormatSettings & format_settings) const;
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void load(const MergeTreeData & storage, const PartMetaCachePtr & meta_cache, const DiskPtr & disk, const String & part_path);
void store(const MergeTreeData & storage, const DiskPtr & disk, const String & part_path, MergeTreeDataPartChecksums & checksums) const;
void store(const Block & partition_key_sample, const DiskPtr & disk, const String & part_path, MergeTreeDataPartChecksums & checksums) const;
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void assign(const MergeTreePartition & other) { value = other.value; }
void create(const StorageMetadataPtr & metadata_snapshot, Block block, size_t row, ContextPtr context);
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void appendFiles(const MergeTreeData & storage, Strings & files) const;
/// 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);
/// 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);
};
}