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