Please correct me if I have this wrong, but my vague understanding is that the data representation heart of Apache Drill lives on in the rather active Apache Arrow project.

https://stackoverflow.com/questions/53533506/what-is-the-dif...

https://github.com/apache/arrow/commit/e6905effbb9383afd2423...

And the platform/tools side of Drill now lives on as Dremio, which uses Apache Arrow.

https://github.com/dremio/dremio-oss

So the essence of Drill still lives, but it became half Apache project and half vendor controlled and supported, and the root of that split is now orphaned.