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47 lines
1.2 KiB
C++
47 lines
1.2 KiB
C++
#pragma once
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#include <ext/shared_ptr_helper.hpp>
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#include <DB/Storages/IStorage.h>
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namespace DB
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{
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class Context;
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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 : private ext::shared_ptr_helper<StorageSystemClusters>, public IStorage
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{
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friend class ext::shared_ptr_helper<StorageSystemClusters>;
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public:
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StorageSystemClusters(const std::string & name_, Context & context_);
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static StoragePtr create(const std::string & name_, Context & context_);
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std::string getName() const override { return "SystemClusters"; }
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std::string getTableName() const override { return name; }
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const NamesAndTypesList & getColumnsListImpl() const override { return columns; }
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BlockInputStreams read(
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const Names & column_names,
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ASTPtr query,
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const Context & context,
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const Settings & settings,
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QueryProcessingStage::Enum & processed_stage,
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size_t max_block_size = DEFAULT_BLOCK_SIZE,
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unsigned threads = 1) override;
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private:
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StorageSystemClusters(const std::string & name_);
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private:
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const std::string name;
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NamesAndTypesList columns;
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Context & context;
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};
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}
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