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