Earlier quoted context omitted.
I double checked my codebase and it looks like it's just JSONB, which CockroachDB also doesn't support [0]. Sorry to bother about missing features, but there are really some things that prevent a smooth transition from Postgres. [0] https://github.com/cockroachdb/cockroach/issues/2969
Yep, JSONB is on our roadmap as well, although it won't come before array column type support. Thanks for the feedback - I'd personally love to see migrations from PostgreSQL to CockroachDB become seamless for more complex use cases as we continue development.
However Odoo leans heavily on Postgres, migration would be a lot of work I imagine. The first snag I've hit with CockroachDB is the lack of 'CREATE SEQUENCE'.
Plus, Odoo uses REPEATABLE READ + a hand-rolled system of locks for consistency, I'm not sure how that would play out with CockroachDB. In my experience some of the performance issues come more from long lived locks in the app than from sheer DB performance.