text: -- @testpoint: opengauss关键字sysid(非保留)，作为函数名,部分测试点合理报错
  
  --关键字不带引号-成功
  drop function if exists sysid;
  create function sysid(i integer)
  returns integer
  as $$
  begin
      return i+1;
  end;
  $$ language plpgsql;
  /
  --关键字带双引号-成功
  drop function if exists "sysid";
  create function "sysid"(i integer)
  returns integer
  as $$
  begin
      return i+1;
  end;
  $$ language plpgsql;
  /
  --关键字带单引号-合理报错
  drop function if exists 'sysid';
  create function 'sysid'(i integer)
  returns integer
  as $$
  begin
      return i+1;
  end;
  $$ language plpgsql;
  /
  --关键字带反引号-合理报错
  drop function if exists `sysid`;
  create function `sysid`(i integer)
  returns integer
  as $$
  begin
      return i+1;
  end;
  $$ language plpgsql;
  /
  --清理环境
  drop function if exists sysid;
  drop function if exists "sysid";
  