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51 lines
1.6 KiB
C++
51 lines
1.6 KiB
C++
#pragma once
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#include <Storages/MergeTree/MergeTreeDataPartChecksum.h>
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#include <base/types.h>
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#include <IO/WriteBuffer.h>
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#include <IO/ReadBuffer.h>
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#include <IO/Operators.h>
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#include <array>
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namespace DB
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{
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class NamesAndTypesList;
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/// This class provides a compact representation of part metadata (available columns and checksums)
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/// that is intended to be stored in the part znode in ZooKeeper.
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/// It can also be initialized from the legacy format (from the contents of separate <part>/columns
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/// and <part>/checksums znodes).
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class ReplicatedMergeTreePartHeader
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{
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public:
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ReplicatedMergeTreePartHeader() = default;
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static ReplicatedMergeTreePartHeader fromColumnsAndChecksumsZNodes(
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const String & columns_znode, const String & checksums_znode);
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static ReplicatedMergeTreePartHeader fromColumnsAndChecksums(
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const NamesAndTypesList & columns, const MergeTreeDataPartChecksums & full_checksums);
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void read(ReadBuffer & in);
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static ReplicatedMergeTreePartHeader fromString(const String & str);
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void write(WriteBuffer & out) const;
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String toString() const;
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const std::array<char, 16> & getColumnsHash() const { return columns_hash; }
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const MinimalisticDataPartChecksums & getChecksums() const { return checksums; }
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private:
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ReplicatedMergeTreePartHeader(std::array<char, 16> columns_hash_, MinimalisticDataPartChecksums checksums_)
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: columns_hash(std::move(columns_hash_)), checksums(std::move(checksums_))
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{
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}
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std::array<char, 16> columns_hash;
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MinimalisticDataPartChecksums checksums;
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};
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}
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