[Dovecot] "select NULL as password..." failing after upgrade to dovecot-1.1

[Sergey Ivanov]

Hi,
I've upgraded mail server to dovecot-1.1, on solaris-10 with mysql user 
database.
I used sql query
"SELECT NULL as password, login as user, 
concat('/mail/var/dovecot/',login) AS userdb_home, 501 AS userdb_uid, 
501 AS userdb_gid FROM users WHERE login='%n' AND 
password=old_password('%w')" with dovecot-1.0.15 and it worked perfectly.
But since upgrade the server can not authenticate any users, complaining 
in info_log: "Empty password returned without no_password".
How to set up such things in dovecot-1.1? Is it possible?
-- 
  Sergey Ivanov.