text: --  @testpoint:opengauss关键字desc(保留)，作为函数名
  
  --关键字不带引号-失败
  drop function if exists desc;
  create function desc(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 "desc";
  create function "desc"(i integer)
  returns integer
  as $$
  begin
      return i+1;
  end;
  $$ language plpgsql;
  /
  drop function "desc";
  
  --关键字带单引号-合理报错
  drop function if exists 'desc';
  create function 'desc'(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 `desc`;
  create function `desc`(i integer)
  returns integer
  as $$
  begin
      return i+1;
  end;
  $$ language plpgsql;
  /