text: #pragma once
  #include <Common/config.h>
  #if USE_HDFS
  
  #include <Storages/IStorage.h>
  #include <Poco/URI.h>
  #include <common/logger_useful.h>
  #include <ext/shared_ptr_helper.h>
  
  namespace DB
  {
  /**
   * This class represents table engine for external hdfs files.
   * Read method is supported for now.
   */
  class StorageHDFS : public ext::shared_ptr_helper<StorageHDFS>, public IStorage
  {
  public:
      String getName() const override
      {
          return "HDFS";
      }
  
      String getTableName() const override
      {
          return table_name;
      }
  
      BlockInputStreams read(const Names & column_names,
          const SelectQueryInfo & query_info,
          const Context & context,
          QueryProcessingStage::Enum processed_stage,
          size_t max_block_size,
          unsigned num_streams) override;
  
      BlockOutputStreamPtr write(const ASTPtr & query, const Settings & settings) override;
  
      void rename(const String & new_path_to_db, const String & new_database_name, const String & new_table_name) override;
  
  protected:
      StorageHDFS(const String & uri_,
          const String & table_name_,
          const String & format_name_,
          const ColumnsDescription & columns_,
          Context & context_);
  
  private:
      String uri;
      String format_name;
      String table_name;
  
      Logger * log = &Logger::get("StorageHDFS");
  };
  }
  
  #endif
  