2014-06-16 17:32:31 +00:00
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#pragma once
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2017-06-06 17:18:32 +00:00
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#include <ext/shared_ptr_helper.h>
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2016-08-26 21:25:05 +00:00
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2017-04-01 09:19:00 +00:00
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#include <Core/NamesAndTypes.h>
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#include <Storages/IStorage.h>
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#include <DataStreams/NullBlockInputStream.h>
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#include <DataStreams/NullBlockOutputStream.h>
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2014-06-16 17:32:31 +00:00
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namespace DB
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{
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2017-04-16 15:00:33 +00:00
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/** When writing, does nothing.
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* When reading, returns nothing.
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2014-06-16 17:32:31 +00:00
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*/
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2017-06-06 18:36:13 +00:00
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class StorageNull : public ext::shared_ptr_helper<StorageNull>, public IStorage
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2014-06-16 17:32:31 +00:00
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{
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public:
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2017-04-01 07:20:54 +00:00
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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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2014-06-16 17:32:31 +00:00
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2017-04-01 07:20:54 +00:00
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BlockInputStreams read(
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2018-01-09 02:09:08 +00:00
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const Names & column_names,
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2017-12-01 21:13:25 +00:00
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const SelectQueryInfo &,
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const Context &,
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QueryProcessingStage::Enum &,
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size_t,
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unsigned) override
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2017-04-01 07:20:54 +00:00
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{
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2018-01-09 02:09:08 +00:00
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return { std::make_shared<NullBlockInputStream>(getSampleBlockForColumns(column_names)) };
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2017-04-01 07:20:54 +00:00
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}
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2014-06-16 17:32:31 +00:00
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2017-12-01 21:13:25 +00:00
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BlockOutputStreamPtr write(const ASTPtr &, const Settings &) override
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2017-04-01 07:20:54 +00:00
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{
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2018-02-19 00:45:32 +00:00
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return std::make_shared<NullBlockOutputStream>(getSampleBlock());
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2017-04-01 07:20:54 +00:00
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}
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2014-06-16 17:32:31 +00:00
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2017-12-01 21:13:25 +00:00
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void rename(const String & /*new_path_to_db*/, const String & /*new_database_name*/, const String & new_table_name) override
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2017-04-01 07:20:54 +00:00
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{
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name = new_table_name;
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}
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2014-06-16 17:32:31 +00:00
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2018-01-11 19:13:19 +00:00
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void alter(const AlterCommands & params, const String & database_name, const String & table_name, const Context & context) override;
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2014-06-16 17:32:31 +00:00
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private:
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2017-04-01 07:20:54 +00:00
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String name;
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2014-06-16 17:32:31 +00:00
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2017-11-04 03:20:18 +00:00
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protected:
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2017-04-01 07:20:54 +00:00
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StorageNull(
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const std::string & name_,
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2017-12-25 21:57:29 +00:00
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const NamesAndTypesList & columns_,
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const NamesAndTypesList & materialized_columns_,
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const NamesAndTypesList & alias_columns_,
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2017-04-01 07:20:54 +00:00
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const ColumnDefaults & column_defaults_)
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2018-01-25 14:42:39 +00:00
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: IStorage{columns_, materialized_columns_, alias_columns_, column_defaults_}, name(name_) {}
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2014-06-16 17:32:31 +00:00
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};
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}
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