CockroachDB explicitly aims to offer a Postgres-compatible interface. Is their homepage reference enough for that? https://www.cockroachlabs.com/product/cockroachdb/ or https://www.cockroachlabs.com/docs/stable/build-an-app-with-...
Roadmap: https://github.com/cockroachdb/cockroach/wiki/Roadmap
Confirmed Development (I see you already reference this issue above): https://github.com/cockroachdb/cockroach/issues/2969