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