text: --  @testpoint:opengauss关键字add(非保留)，作为序列名
  --关键字不带引号-成功
  drop sequence if exists add;
  create sequence add start 100 cache 50;
  
  --清理环境
  drop sequence add;
  
  --关键字带双引号-成功
  drop sequence if exists "add";
  create sequence "add" start 100 cache 50;
  
  --清理环境
  drop sequence "add";
  
  --关键字带单引号-合理报错
  drop sequence if exists 'add';
  
  --关键字带反引号-合理报错
  drop sequence if exists `add`;
  