text: -- Tags: no-parallel
  
  drop user if exists "       ";
  drop user if exists '   spaces';
  drop user if exists 'spaces    ';
  drop user if exists " spaces ";
  drop user if exists "test 01119";
  drop user if exists "Вася Пупкин";
  drop user if exists "无名氏 ";
  drop user if exists "🙈 🙉 🙊";
  
  create user "       ";
  create user '   spaces';
  create user 'spaces    ';
  create user ` INTERSERVER SECRET `;  -- { serverError BAD_ARGUMENTS }
  create user '';  -- { serverError BAD_ARGUMENTS }
  create user 'test 01119';
  alter user `test 01119` rename to " spaces ";
  alter user " spaces " rename to '';  -- { serverError BAD_ARGUMENTS }
  alter user " spaces " rename to " INTERSERVER SECRET ";  -- { serverError BAD_ARGUMENTS }
  create user "Вася Пупкин";
  create user "无名氏 ";
  create user "🙈 🙉 🙊";
  
  select length(name), name, '.' from system.users where position(name, ' ')!=0 order by name;
  
  drop user "       ";
  drop user '   spaces';
  drop user 'spaces    ';
  drop user " spaces ";
  drop user "Вася Пупкин";
  drop user "无名氏 ";
  drop user "🙈 🙉 🙊";
  