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#pragma once
#include <DataTypes/DataTypeString.h>
#include <DataTypes/DataTypesNumber.h>
#include <Storages/System/IStorageSystemOneBlock.h>
namespace DB
{
class Context;
class Cluster;
/** Implements system table 'clusters'
* that allows to obtain information about available clusters
* (which may be specified in Distributed tables).
*/
class StorageSystemClusters final : public IStorageSystemOneBlock<StorageSystemClusters>
{
public:
std::string getName() const override { return "SystemClusters"; }
static NamesAndTypesList getNamesAndTypes();
static NamesAndAliases getNamesAndAliases();
protected:
using IStorageSystemOneBlock::IStorageSystemOneBlock;
using NameAndCluster = std::pair<String, std::shared_ptr<Cluster>>;
void fillData(MutableColumns & res_columns, ContextPtr context, const SelectQueryInfo & query_info) const override;
static void writeCluster(MutableColumns & res_columns, const NameAndCluster & name_and_cluster, const std::vector<UInt8> & is_active);
};
}
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