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