CockroachDB is not a fork of Postgres, it's a NewSQL database written from scratch, compatible with the PostgreSQL protocol, and aiming at being SQL compatible

CockroachDB is not a fork of Postgres, it's a NewSQL database written from scratch, compatible with the PostgreSQL protocol, and aiming at being SQL compatible with Postgres. I think you were thinking about YugabyteDB which is a wrapper/fork around Postgres.