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80 lines
2.1 KiB
C++
80 lines
2.1 KiB
C++
#pragma once
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#include <Storages/IStorage.h>
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#include <Core/Defines.h>
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#include <Common/MultiVersion.h>
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#include <ext/shared_ptr_helper.h>
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#include <IO/WriteBufferFromString.h>
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#include <IO/Operators.h>
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namespace Poco
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{
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class Logger;
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}
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namespace DB
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{
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struct DictionaryStructure;
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struct IDictionaryBase;
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class ExternalDictionaries;
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class StorageDictionary : public ext::shared_ptr_helper<StorageDictionary>, public IStorage
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{
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friend struct ext::shared_ptr_helper<StorageDictionary>;
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public:
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std::string getName() const override { return "Dictionary"; }
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std::string getTableName() const override { return table_name; }
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std::string getDatabaseName() const override { return database_name; }
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BlockInputStreams read(const Names & column_names,
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const SelectQueryInfo & query_info,
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const Context & context,
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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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static NamesAndTypesList getNamesAndTypes(const DictionaryStructure & dictionary_structure);
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template <typename ForwardIterator>
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static std::string generateNamesAndTypesDescription(ForwardIterator begin, ForwardIterator end)
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{
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std::string description;
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{
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WriteBufferFromString buffer(description);
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bool first = true;
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for (; begin != end; ++begin)
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{
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if (!first)
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buffer << ", ";
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first = false;
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buffer << begin->name << ' ' << begin->type->getName();
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}
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}
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return description;
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}
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private:
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using Ptr = MultiVersion<IDictionaryBase>::Version;
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String table_name;
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String database_name;
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String dictionary_name;
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Poco::Logger * logger;
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void checkNamesAndTypesCompatibleWithDictionary(const DictionaryStructure & dictionary_structure) const;
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protected:
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StorageDictionary(
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const String & database_name_,
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const String & table_name_,
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const ColumnsDescription & columns_,
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const Context & context,
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bool attach,
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const String & dictionary_name_);
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};
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}
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