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