text: --  @testpoint:opengauss关键字exchange(非保留)，作为用户组名
  
  
  --关键字不带引号-成功
  drop group if exists exchange;
  create group exchange with password 'gauss@123';
  drop group exchange;
  
  --关键字带双引号-成功
  drop group if exists "exchange";
  create group "exchange" with password 'gauss@123';
  drop group "exchange";
  
  --关键字带单引号-合理报错
  drop group if exists 'exchange';
  create group 'exchange' with password 'gauss@123';
  
  --关键字带反引号-合理报错
  drop group if exists `exchange`;
  create group `exchange` with password 'gauss@123';
  