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