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71 lines
2.1 KiB
C++
71 lines
2.1 KiB
C++
#pragma once
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#include <Storages/IStorage.h>
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#include <ext/shared_ptr_helper.h>
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namespace DB
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{
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struct DictionaryStructure;
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class StorageDictionary final : 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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void checkTableCanBeDropped() const override;
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Pipe read(
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const Names & column_names,
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const StorageMetadataPtr & /*metadata_snapshot*/,
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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,
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unsigned threads) override;
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static NamesAndTypesList getNamesAndTypes(const DictionaryStructure & dictionary_structure);
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static String generateNamesAndTypesDescription(const NamesAndTypesList & list);
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const String & dictionaryName() const { return dictionary_name; }
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String resolvedDictionaryName() const;
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/// Specifies where the table is located relative to the dictionary.
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enum class Location
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{
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/// Table was created automatically as an element of a database with the Dictionary engine.
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DictionaryDatabase,
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/// Table was created automatically along with a dictionary
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/// and has the same database and name as the dictionary.
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/// It provides table-like access to the dictionary.
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/// User cannot drop that table.
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SameDatabaseAndNameAsDictionary,
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/// Table was created explicitly by a statement like
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/// CREATE TABLE ... ENGINE=Dictionary
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/// User chose the table's database and name and can drop that table.
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Custom,
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};
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private:
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const String dictionary_name;
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const Location location;
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protected:
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StorageDictionary(
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const StorageID & table_id_,
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const String & dictionary_name_,
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const ColumnsDescription & columns_,
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Location location_);
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StorageDictionary(
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const StorageID & table_id_,
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const String & dictionary_name_,
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const DictionaryStructure & dictionary_structure,
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Location location_);
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};
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}
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