dovecot - Apr 2012 - Username bug in '%%' variables selects

Hi! Forgive my bad English.

I trying to set up shared folders, but I can't.

I shared INBOX of 'victor at domain.com' for 'victor at
testmail.domain.com'
There is my debugging results:

doveadm acl debug -u victor at testmail.domain.com INBOX.shared.victor at
domain.com.

doveadm(victor at testmail.domain.com): Error: Couldn't create namespace
'INBOX.shared.' for user victor at domain: userdb didn't return a
home directory, but mail_location used it (%h): maildir:%h

That's I seen in logs:

auth-worker: Debug: sql(victor at domain): SELECT
CONCAT('/var/spool/mail/', SUBSTRING_INDEX(email, '@', -1),
'/', SUBSTRING_INDEX(email, '@', 1)) as home from `users` WHERE
email='victor at domain'

What happened with my username? 'victor at domain' is not correct value.



My config:

namespace {
  inbox = yes
  location   prefix = INBOX.
  separator = .
  type = private
}
namespace {
  hidden = no
  list = yes
  location = maildir:%%h
  prefix = INBOX.shared.%%u.
  separator = .
  subscriptions = no
  type = shared
}


password_query = \
  SELECT email as username, password \
  FROM users WHERE email = '%u'

user_query = SELECT CONCAT('/var/spool/mail/', SUBSTRING_INDEX(email,
'@', -1), '/', SUBSTRING_INDEX(email, '@', 1)) as home
from `users` WHERE email='%u'


Please, help me!


-- 
Best regards,

Victor

I solved this issue by changing a namespace to native type. 

namespace {
  separator = /
  prefix   inbox = yes
}

namespace {
  separator = .
  prefix = INBOX.
  inbox = no
  hidden = yes
  list = no
  alias_for }

namespace {
  type = shared
  separator = /
  prefix = shared/%%u/
  list = yes
  subscriptions = no
  hidden = no
  location = maildir:%%h:INDEX=%h/shared/%%u
}

It did not turn out to make the transparent migration. :(
Outlooks 2007 reloaded all scheme and frozen.


It's seems a bug in Dovecot.