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