Does anybody know if the issue mentioned in the NH-528 (http://jira.nhibernate.org/browse/NH-528) will be actually implemented/fixed in NHibernate, and if yes, which possible version? I tried with 1.2 RC and you still cannot use object instances with the GROUP BY clause (as stated in the 1.2 RC documentation as well).

It would be really a nice thing to have. Right now I have to explicitly declare a GROUP BY part of the query which includes all the properties I need to group by on.

I just bumped into the same problem using NH 1.2b3. I would really love to see this fixed as well.

Perhaps it was forgotten about because it was marked as fixed in 1.2b2. I do hope that it was not decided to leave the feature out forever.

Seems like a good, standard feature to include in the 1.2 release.

The issue you are referring to describes a documentation change, this was done already.

As for the GROUP BY functionality, no, it won't be implemented.

Why not?

This is a really useful feature and it should be relatively easy to implement. At least it seems so, i figure if you can expand the object names to their full column names in the select, couldn't you just use the same code in the group by to expand the object?