ClickHouse/src/Storages/System/StorageSystemClusters.h

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