ClickHouse/dbms/include/DB/Storages/StorageChunkRef.h
2015-01-21 06:56:28 +03:00

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#pragma once
#include <DB/Storages/StorageChunks.h>
namespace DB
{
/** Ссылка на кусок данных в таблице типа Chunks.
* Запись не поддерживается.
*/
class StorageChunkRef : public IStorage
{
public:
static StoragePtr create(const std::string & name_, const Context & context_, const std::string & source_database_name_, const std::string & source_table_name_, bool attach);
std::string getName() const override { return "ChunkRef"; }
std::string getTableName() const override { return name; }
const NamesAndTypesList & getColumnsListImpl() const override { return getSource().getColumnsListImpl(); }
/// В таблице, на которую мы ссылаемся, могут быть виртуальные столбцы.
NameAndTypePair getColumn(const String & column_name) const override { return getSource().getColumn(column_name); };
bool hasColumn(const String & column_name) const override { return getSource().hasColumn(column_name); };
BlockInputStreams read(
const Names & column_names,
ASTPtr query,
const Context & context,
const Settings & settings,
QueryProcessingStage::Enum & processed_stage,
size_t max_block_size = DEFAULT_BLOCK_SIZE,
unsigned threads = 1) override;
ASTPtr getCustomCreateQuery(const Context & context) const override;
void drop() override;
String source_database_name;
String source_table_name;
bool checkData() const override;
private:
String name;
const Context & context;
StorageChunkRef(const std::string & name_, const Context & context_, const std::string & source_database_name_, const std::string & source_table_name_, bool attach);
/// TODO: может быть, можно просто хранить указатель на родительскую таблицу?
StorageChunks & getSource();
const StorageChunks & getSource() const;
};
}