I really like the pg protocol (like e.g. Cockroach), it let me use my usual tools. There are a few things I noticed:

1. It has a fairly rich support for types - these new-ish SQL engines often lack quite a lot of things, but this seems pretty decent. 2. I don't see any comparisons to KSQL, which seems to be the primary competitor. 3. Read the license. Read it carefully. It has a weird "will become open source in four years" clause, so keep that in mind. It also disallows it being hosted for clients to use (esentially as a DBaaS).