first, so that they all work the same way, because it's getting
complicated, and second, so that we can do the appropriate thing
instead of CREATE SCHEMA for cockroachdb.
Change-Id: I27fbaeeb6223a3e06d97bcf692a2d014b31465f7
Adjust the pg_constraint query so that it works without a LATERAL JOIN,
since CockroachDB doesn't like that.
This isn't hooked up to a cockroach test yet, but that's coming.
Change-Id: I0df6b477d958996b673fc121eaa1f7c35e5cc504