(I work for CockroachDB) This is something that we're definitely interested in. We haven't decided yet exactly what form it will take, but we plan to offer some

(I work for CockroachDB) This is something that we're definitely interested in. We haven't decided yet exactly what form it will take, but we plan to offer some way to ensure that the DB will return an error instead of silently falling back to an extremely inefficient query plan.