EF7和GroupBy（）無法翻譯

我在EF7 Beta 8上運行以下代碼：

var locationGrops = from l in db.Locations
                    group l by l.ServiceType into g
                    select g;

var list = locationGrops.ToList();

當我執行此代碼時，EF會顯示警告。

var locationGrops = from l in db.Locations
                    group l by l.ServiceType into g
                    select g;

var list = locationGrops.ToList();

查詢對我來說似乎很基礎，SQL中有GROUP BY。有沒有辦法讓它在服務器上運行？