text: #pragma once
  
  #include <ext/shared_ptr_helper.h>
  
  #include <Core/NamesAndTypes.h>
  #include <Storages/IStorage.h>
  #include <DataStreams/NullBlockInputStream.h>
  #include <DataStreams/NullBlockOutputStream.h>
  
  
  namespace DB
  {
  
  /** When writing, does nothing.
    * When reading, returns nothing.
    */
  class StorageNull : public ext::shared_ptr_helper<StorageNull>, public IStorage
  {
  public:
      std::string getName() const override { return "Null"; }
      std::string getTableName() const override { return table_name; }
  
      BlockInputStreams read(
          const Names & column_names,
          const SelectQueryInfo &,
          const Context &,
          QueryProcessingStage::Enum &,
          size_t,
          unsigned) override
      {
          return { std::make_shared<NullBlockInputStream>(getSampleBlockForColumns(column_names)) };
      }
  
      BlockOutputStreamPtr write(const ASTPtr &, const Settings &) override
      {
          return std::make_shared<NullBlockOutputStream>(getSampleBlock());
      }
  
      void rename(const String & /*new_path_to_db*/, const String & /*new_database_name*/, const String & new_table_name) override
      {
          table_name = new_table_name;
      }
  
      void alter(const AlterCommands & params, const String & database_name, const String & table_name, const Context & context) override;
  
  private:
      String table_name;
  
  protected:
      StorageNull(String table_name_, ColumnsDescription columns_description_)
          : IStorage{std::move(columns_description_)}, table_name(std::move(table_name_))
      {
      }
  };
  
  }
  