[Exim] Multiple rows from a MySQL query

Just upgraded to Exim4 and decided to do some new fancy DB routines....

Do the MySQL lookups support having multiple rows returned?

I'm attempting to create an alias router that will forward an alias to
multiple addresses. Traditionally I'd just add
"xxx:user1@domain,user2@domain" in the aliases file...but I don't see
anything in the Exim docs about handling multiple rows or anything in the
MySQL docs about combining multiple rows into a single concatentated string.

Sam