text: --  @testpoint:opengauss关键字within(非保留)，作为模式名
  
  
  --关键字不带引号-成功
  drop schema if exists within;
  create schema within;
  drop schema within;
  
  --关键字带双引号-成功
  drop schema if exists "within";
  create schema "within";
  drop schema "within";
  
  --关键字带单引号-合理报错
  drop schema if exists 'within';
  create schema 'within';
  
  --关键字带反引号-合理报错
  drop schema if exists `within`;
  create schema `within`;
  