Gavin King

This looks fine to me though I can't test it because I don't have Informix. The change would need to be replicated to H6.

@beikov it sounds like you're thinking about a different problem, though I can only speculate what it might be. The issue _this proposal_ seeks to solve is that there are...

Yep, using schemas for tenant segregation is all good, but a completely different usecase.

Note that the reason that the tests are failing here is that this PR depends on a change to commons-annotations: https://github.com/hibernate/hibernate-commons-annotations/pull/18

FTR, I was more thinking of Hibernate Reactive's test suite, which is not quite as "extreme" as core.

So, there's a problem with this: there's no good way for the previous-generation id generators to get access to the `@DefaultSchema` of the entities they belong to. There _might_ be...

> "tombstone" cache entries OMG "tombstone" I love it.

Probably breaks for composite keys?

- Use of aggregate functions `sum()`, `max()`, etc, in `where` clause should be an error - Use of `key()`, `value()`, `entry()` on a non-`Map` alias causes an NPE - subqueries...

One question: which version of the JDK should we be targeting here? Because I've been retesting everything and noticed that it doesn't compile on JDK 13 due to some minor...