text: -- @testpoint: opengauss关键字add(非保留)，作为同义词对象名，部分测试点合理报错
  --前置条件
  drop table if exists add_test;
  create table add_test(id int,name varchar(10));
  
  --关键字不带引号-成功
  drop synonym if exists add;
  create synonym add for add_test;
  insert into add values (1,'ada'),(2, 'bob');
  update add set add.name='cici' where add.id=2;
  select * from add;
  
  --清理环境
  drop synonym if exists add;
  
  --关键字带双引号-成功
  drop synonym if exists "add";
  create synonym "add" for add_test;
  insert into "add" values (1,'ada'),(2, 'bob');
  update "add" set "add".name='cici' where "add".id=2;
  select * from "add";
  
  --清理环境
  drop synonym if exists "add";
  
  --关键字带单引号-合理报错
  drop synonym if exists 'add';
  
  --关键字带反引号-合理报错
  drop synonym if exists `add`;
  drop table if exists add_test;