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https://github.com/ClickHouse/ClickHouse.git
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3ebfd2fb7f
This reverts commit 34b3f738a67432b44f6f69238dd1529535984d1a.
66 lines
1.8 KiB
C++
66 lines
1.8 KiB
C++
#pragma once
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#include <DB/Core/NamesAndTypes.h>
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#include <DB/Storages/IStorage.h>
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#include <DB/DataStreams/NullBlockInputStream.h>
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#include <DB/DataStreams/NullBlockOutputStream.h>
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namespace DB
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{
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/** При записи, ничего не делает.
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* При чтении, возвращает пустоту.
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*/
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class StorageNull : public IStorage
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{
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public:
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static StoragePtr create(
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const std::string & name_,
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NamesAndTypesListPtr columns_,
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const NamesAndTypesList & materialized_columns_,
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const NamesAndTypesList & alias_columns_,
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const ColumnDefaults & column_defaults_)
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{
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return (new StorageNull{name_, columns_, materialized_columns_, alias_columns_, column_defaults_})->thisPtr();
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}
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std::string getName() const override { return "Null"; }
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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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const size_t max_block_size = DEFAULT_BLOCK_SIZE,
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const unsigned threads = 1) override
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{
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return { new NullBlockInputStream };
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}
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BlockOutputStreamPtr write(ASTPtr query) override
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{
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return new NullBlockOutputStream;
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}
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void rename(const String & new_path_to_db, const String & new_database_name, const String & new_table_name) override { name = new_table_name; }
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private:
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String name;
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NamesAndTypesListPtr columns;
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StorageNull(
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const std::string & name_,
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NamesAndTypesListPtr columns_,
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const NamesAndTypesList & materialized_columns_,
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const NamesAndTypesList & alias_columns_,
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const ColumnDefaults & column_defaults_)
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: IStorage{materialized_columns_, alias_columns_, column_defaults_}, name(name_), columns(columns_) {}
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};
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}
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