text: --  @testpoint:opengauss关键字dictionary(非保留)，作为角色名
  
  
  --关键字不带引号-成功
  drop role if exists dictionary;
  create role dictionary with password 'gauss@123' valid until '2020-12-31';
  drop role dictionary;
  
  --关键字带双引号-成功
  drop role if exists "dictionary";
  create role "dictionary" with password 'gauss@123' valid until '2020-12-31';
  drop role "dictionary";
  
  --关键字带单引号-合理报错
  drop role if exists 'dictionary';
  create role 'dictionary' with password 'gauss@123' valid until '2020-12-31';
  
  --关键字带反引号-合理报错
  drop role if exists `dictionary`;
  create role `dictionary` with password 'gauss@123' valid until '2020-12-31';
  