strange error with openldap 2.4 and sql backend

[Adrian <adrian.moennich@cern.ch>]

Hi,

I have a very strange issue with OpenLDAP 2.4 and the SQL backend.
at_query fails although the exactly same query works fine with 2.3.

I posted some details on this question on SF:
http://serverfault.com/questions/566902/openldap-sql-backend-failing
There's also this Gist containing my config, the full error message,
etc.: https://gist.github.com/ThiefMaster/b47613f79d6a3ed879df

Regards,
Adrian