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