[HyperDB] Select in multiple partitions

[Pablo Fabregat]

Hi all, i'm using hyperDB with WP MU and i'm trying to do a select in all
the partitions...
that is,
i want to make a "SELECT fields FROM table WHERE etc..." but i need the
results from all the partitions, is this possible ?
I set up the servers with add_db_server.

Thanks in advance