My product team at Google just released a downloadable edition of #AlloyDB, its #PostgreSQL-compatible database engine loaded with lots of neat features like an index advisor and a columnar engine and so on and suchlike.
It's in preview! You can install it on any newish RHEL or Debian-like and try it out for free.
https://cloud.google.com/blog/products/databases/run-alloydb-anywhere
I co-authored the docs, by gar.