> The problem with preview() is that it must "freeze" the query into a
> final form, as opposed to the intermediate form it uses when holding the
> query prior to execution. preview() almost goes completely through the
> actual query finalization process in order to freeze the query, so it
> can have unfortunate side effects. Probably the change is due to the
> Query call chain reorganization, needed to allow nulls in queries.
> I'm not saying that's what's going on for certain, but that's my best
> guess right now. Unfortunately, I'm not likely to be able to spend much
> more time on it for a while.
I hope that you will find some time to solve this bug. It sounds like a joke,
but this bug make v2.2.0 not binary, not logically compatible with previous
versions - because of bug existent code doesn't work. So v2.2.0 should be at
last 3.0.0 :)