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