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