text: --  @testpoint:opengauss关键字nvarchar2(非保留)，作为外部数据源名
  
  --关键字不带引号-成功
  drop data source if exists nvarchar2;
  create data source nvarchar2;
  drop data source nvarchar2;
  
  --关键字带双引号-成功
  drop data source if exists "nvarchar2";
  create data source "nvarchar2";
  drop data source "nvarchar2";
  
  --关键字带单引号-合理报错
  drop data source if exists 'nvarchar2';
  create data source 'nvarchar2';
  
  --关键字带反引号-合理报错
  drop data source if exists `nvarchar2`;
  create data source `nvarchar2`;
  