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