text: --  @testpoint:opengauss关键字character_set_schema(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 character_set_schema;
  create data source character_set_schema;
  
  --清理环境
  drop data source character_set_schema;
  
  --关键字带双引号-成功
  drop data source if exists "character_set_schema";
  create data source "character_set_schema";
  
  --清理环境
  drop data source "character_set_schema";
  
  --关键字带单引号-合理报错
  drop data source if exists 'character_set_schema';
  
  --关键字带反引号-合理报错
  drop data source if exists `character_set_schema`;
  