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