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