text: -- @testpoint: opengauss关键字Instance(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 explain_test;
  create table explain_test(id int,name varchar(10));
  
  --关键字不带引号-成功
  drop synonym if exists Instance;
  create synonym Instance for explain_test;
  insert into Instance values (1,'ada'),(2, 'bob');
  update Instance set Instance.name='cici' where Instance.id=2;
  select * from Instance;
  
  --关键字带双引号-成功
  drop synonym if exists "Instance";
  create synonym "Instance" for explain_test;
  
  
  --关键字带单引号-合理报错
  drop synonym if exists 'Instance';
  create synonym 'Instance' for explain_test;
  insert into 'Instance' values (1,'ada'),(2, 'bob');
  update 'Instance' set 'Instance'.name='cici' where 'Instance'.id=2;
  select * from 'Instance';
  
  --关键字带反引号-合理报错
  drop synonym if exists `Instance`;
  create synonym `Instance` for explain_test;
  insert into `Instance` values (1,'ada'),(2, 'bob');
  update `Instance` set `Instance`.name='cici' where `Instance`.id=2;
  select * from `Instance`;
  --清理环境
  drop synonym if exists instance;
  drop synonym if exists "Instance";
  drop table if exists explain_test;