[Dovecot] Problem with configuring dovecot to take namespaces from database

[Marcin Mirosław]

Hello!
I'd like to set up dovecot to keep namespaces in database, keep more 
than one namespace per user.

I try to create the simplest rule (even without tuple in db table) to 
get new namespace, unfortunately it doesn't work.

My user_query is:
SELECT '/dane/domeny/%d/mail/%n/' as home, dovecot_typ_skrzynki ||':'|| 
'/dane/domeny/%d/mail/%n/' ||'.'|| dovecot_typ_skrzynki as 
mail_location, '*:bytes='||quota_mb||'M' as quota_rule , 
'test33/location=mdbox:~/.mdbox/test33/' as "namespace/test3/prefix"

In debug log i'm getting:
Debug: master out: 
USER#0111#011user at examle.com#011home=/dane/domeny/mejor.pl/mail/marcin/#011mail_location=maildir:/dane/domeny/mejor.pl/mail/marcin/.maildir#011quota_rule=*:bytes=0M#011namespace/test3/prefix=test33/location=mdbox:~/.mdbox/test33/

If i knew how it should look like the line in auth debug log for working 
configuration it could be easier for me to write correct sql query.
May i please for advice?