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