ClickHouse/dbms/include/DB/Storages/StorageSet.h

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#pragma once
#include <ext/shared_ptr_helper.hpp>
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#include <DB/Storages/IStorage.h>
namespace DB
{
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class Set;
using SetPtr = std::shared_ptr<Set>;
/** Общая часть StorageSet и StorageJoin.
*/
class StorageSetOrJoinBase : private ext::shared_ptr_helper<StorageSetOrJoinBase>, public IStorage
{
friend class ext::shared_ptr_helper<StorageSetOrJoinBase>;
friend class SetOrJoinBlockOutputStream;
public:
String getTableName() const override { return name; }
const NamesAndTypesList & getColumnsListImpl() const override { return *columns; }
void rename(const String & new_path_to_db, const String & new_database_name, const String & new_table_name) override;
BlockOutputStreamPtr write(ASTPtr query, const Settings & settings) override;
protected:
StorageSetOrJoinBase(
const String & path_,
const String & name_,
NamesAndTypesListPtr columns_,
const NamesAndTypesList & materialized_columns_,
const NamesAndTypesList & alias_columns_,
const ColumnDefaults & column_defaults_);
String path;
String name;
NamesAndTypesListPtr columns;
UInt64 increment = 0; /// Для имён файлов бэкапа.
/// Восстановление из бэкапа.
void restore();
private:
void restoreFromFile(const String & file_path);
/// Вставить блок в состояние.
virtual void insertBlock(const Block & block) = 0;
virtual size_t getSize() const = 0;
};
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/** Позволяет сохранить множество для последующего использования в правой части оператора IN.
* При вставке в таблицу, данные будут вставлены в множество,
* а также записаны в файл-бэкап, для восстановления после перезапуска.
* Чтение из таблицы напрямую невозможно - возможно лишь указание в правой части оператора IN.
*/
class StorageSet : private ext::shared_ptr_helper<StorageSet>, public StorageSetOrJoinBase
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{
friend class ext::shared_ptr_helper<StorageSet>;
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public:
static StoragePtr create(
const String & path_,
const String & name_,
NamesAndTypesListPtr columns_,
const NamesAndTypesList & materialized_columns_,
const NamesAndTypesList & alias_columns_,
const ColumnDefaults & column_defaults_)
{
return ext::shared_ptr_helper<StorageSet>::make_shared(path_, name_, columns_, materialized_columns_, alias_columns_, column_defaults_);
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}
String getName() const override { return "Set"; }
/// Получить доступ к внутренностям.
SetPtr & getSet() { return set; }
private:
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SetPtr set;
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StorageSet(
const String & path_,
const String & name_,
NamesAndTypesListPtr columns_,
const NamesAndTypesList & materialized_columns_,
const NamesAndTypesList & alias_columns_,
const ColumnDefaults & column_defaults_);
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void insertBlock(const Block & block) override;
size_t getSize() const override;
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};
}