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72 lines
2.2 KiB
C++
72 lines
2.2 KiB
C++
#pragma once
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#include <DB/Storages/IStorage.h>
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#include <DB/Databases/IDatabase.h>
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namespace DB
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{
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class DatabaseCloud;
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/** Таблица, представляющая собой объединение произвольного количества других таблиц.
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* У всех таблиц должна быть одинаковая структура.
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*/
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class StorageCloud : public IStorage
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{
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public:
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static StoragePtr create(
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const std::string & name_,
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NamesAndTypesListPtr columns_,
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const NamesAndTypesList & materialized_columns_,
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const NamesAndTypesList & alias_columns_,
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const ColumnDefaults & column_defaults_);
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std::string getName() const override { return "Cloud"; }
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std::string getTableName() const override { return name; }
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/// Проверка откладывается до метода read. Там проверяется поддержка PREWHERE у использующихся таблиц.
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bool supportsSampling() const override { return true; }
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bool supportsPrewhere() const override { return true; }
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bool supportsFinal() const override { return true; }
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bool supportsIndexForIn() const override { return true; }
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const NamesAndTypesList & getColumnsListImpl() const override { return *columns; }
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NameAndTypePair getColumn(const String & column_name) const override;
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bool hasColumn(const String & column_name) const override;
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BlockInputStreams read(
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const Names & column_names,
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ASTPtr query,
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const Context & context,
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const Settings & settings,
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QueryProcessingStage::Enum & processed_stage,
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size_t max_block_size = DEFAULT_BLOCK_SIZE,
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unsigned threads = 1) override;
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void drop() override {}
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void rename(const String & new_path_to_db, const String & new_database_name, const String & new_table_name) override
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{
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name = new_table_name;
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}
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//void alter(const AlterCommands & params, const String & database_name, const String & table_name, const Context & context) override;
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private:
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String name;
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NamesAndTypesListPtr columns;
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std::weak_ptr<IDatabase> database;
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StorageCloud(
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const std::string & name_,
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NamesAndTypesListPtr columns_,
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const NamesAndTypesList & materialized_columns_,
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const NamesAndTypesList & alias_columns_,
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const ColumnDefaults & column_defaults_);
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};
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}
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