text: --  @testpoint:opengauss关键字routine_schema(非保留)，作为数据库名
  
  --关键字不带引号-成功
  drop database if exists routine_schema;
  create database routine_schema;
  drop database routine_schema;
  
  --关键字带双引号-成功
  drop database if exists "routine_schema";
  create database "routine_schema";
  drop database "routine_schema";
  
  --关键字带单引号-合理报错
  drop database if exists 'routine_schema';
  create database 'routine_schema';
  
  --关键字带反引号-合理报错
  drop database if exists `routine_schema`;
  create database `routine_schema`;
  
  