mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-05 15:21:43 +00:00
47 lines
1.2 KiB
C++
47 lines
1.2 KiB
C++
#pragma once
|
|
|
|
#include <ext/shared_ptr_helper.hpp>
|
|
#include <DB/Storages/IStorage.h>
|
|
|
|
|
|
namespace DB
|
|
{
|
|
|
|
class Context;
|
|
|
|
/** Implements system table 'clusters'
|
|
* that allows to obtain information about available clusters
|
|
* (which may be specified in Distributed tables).
|
|
*/
|
|
class StorageSystemClusters : private ext::shared_ptr_helper<StorageSystemClusters>, public IStorage
|
|
{
|
|
friend class ext::shared_ptr_helper<StorageSystemClusters>;
|
|
|
|
public:
|
|
StorageSystemClusters(const std::string & name_, Context & context_);
|
|
static StoragePtr create(const std::string & name_, Context & context_);
|
|
|
|
std::string getName() const override { return "SystemClusters"; }
|
|
std::string getTableName() const override { return name; }
|
|
const NamesAndTypesList & getColumnsListImpl() const override { return columns; }
|
|
|
|
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;
|
|
|
|
private:
|
|
StorageSystemClusters(const std::string & name_);
|
|
|
|
private:
|
|
const std::string name;
|
|
NamesAndTypesList columns;
|
|
Context & context;
|
|
};
|
|
|
|
}
|