what is sys.dm_pdw_nodes_os_wait_stats

Hi Friends,

SQL 2008 SP3/CU6

what is this object ? sys.dm_pdw_nodes_os_wait_stats I can't find any BOL about it. it's listed in the master db as DMV but I can't do anything with it ? I need to modify permission on it but getting error as object doesn't exist. I'm SA on server, when bowsring through SSMS I can see the obkect, but when trying to execute the following it fails.

use [master]
GO
GRANT SELECT ON sys.dm_pdw_nodes_os_wait_stats TO [db_executor_role]
GO

any idea what's going on ?

Patrick Alexander