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