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