Superset has currently two ways of connecting to Druid:
- pydruid (deprecated) - unfortunately the majority of our dashboard as of today (April 2020) are based on this.
- sqlalchemy
For the former, there seems to be some work in progress in https://github.com/apache/incubator-superset/pull/7091, but I'd concentrate on the latter. We have done something similar for Presto, see https://github.com/apache/incubator-superset/issues/8794#issuecomment-605603773
If possible all the pydruid datasources would need to be migrated to sqlalchemy before enabling anything.