Sort by subfield's subfield (sort=a.b.c)

[gen]

Hi, 

Is it possible to sort by subfield's field or even deeper.

e.g. Let's go wild (assume each subfield is a page reference):

"..., sort=person.address.city.shortTitle"

Thanks!

P.S.
Fetching all results and then sorting is not an option because there is a ton of records.