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89 lines
2.4 KiB
C++
89 lines
2.4 KiB
C++
#pragma once
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#include <ext/shared_ptr_helper.h>
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#include <Storages/IStorage.h>
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namespace DB
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{
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class Set;
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using SetPtr = std::shared_ptr<Set>;
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/** Common part of StorageSet and StorageJoin.
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*/
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class StorageSetOrJoinBase : public IStorage
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{
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friend class SetOrJoinBlockOutputStream;
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public:
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void rename(const String & new_path_to_table_data, const String & new_database_name, const String & new_table_name, TableStructureWriteLockHolder &) override;
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BlockOutputStreamPtr write(const ASTPtr & query, const Context & context) override;
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Strings getDataPaths() const override { return {path}; }
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protected:
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StorageSetOrJoinBase(
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const String & relative_path_,
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const StorageID & table_id_,
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const ColumnsDescription & columns_,
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const ConstraintsDescription & constraints_,
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const Context & context_);
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String base_path;
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String path;
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std::atomic<UInt64> increment = 0; /// For the backup file names.
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/// Restore from backup.
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void restore();
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private:
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void restoreFromFile(const String & file_path);
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/// Insert the block into the state.
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virtual void insertBlock(const Block & block) = 0;
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/// Call after all blocks were inserted.
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virtual void finishInsert() = 0;
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virtual size_t getSize() const = 0;
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};
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/** Lets you save the set for later use on the right side of the IN statement.
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* When inserted into a table, the data will be inserted into the set,
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* and also written to a file-backup, for recovery after a restart.
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* Reading from the table is not possible directly - it is possible to specify only the right part of the IN statement.
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*/
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class StorageSet final : public ext::shared_ptr_helper<StorageSet>, public StorageSetOrJoinBase
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{
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friend struct ext::shared_ptr_helper<StorageSet>;
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public:
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String getName() const override { return "Set"; }
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/// Access the insides.
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SetPtr & getSet() { return set; }
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void truncate(const ASTPtr &, const Context &, TableStructureWriteLockHolder &) override;
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private:
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SetPtr set;
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void insertBlock(const Block & block) override;
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void finishInsert() override;
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size_t getSize() const override;
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protected:
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StorageSet(
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const String & relative_path_,
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const StorageID & table_id_,
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const ColumnsDescription & columns_,
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const ConstraintsDescription & constraints_,
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const Context & context_);
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};
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}
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