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