Add Unique and Foreign Key Constraint Support to Clustered Columnstore Indexes

[jakub4]

Posted on connect but just putting here as well: https://connect.microsoft.com/SQLServer/feedback/details/1031466/constraints-on-clustered-column-store-indexes Currently clustered columnstore indexed tables only support not null constraints. Unique and foreign key (even unenforced - just for metadata purposes) are required for these to be considered "rea" relational tables. I don't want to have to manually code in a unique constraint check every time I insert or update a CCI table.