Each table can have only 1 columnstore index, data from the index is stored in memory in the xVelocity engine. Once a columnstore index has been created on a table you cannot update the table. Microsoft recommends you take the following actions to update the data in a table containing a columnstore index.
Drop the columnstore index and then perform any required INSERT, DELETE, UPDATE, or MERGE operations. To complete the refresh rebuild the columnstore index. (Source Technet)
CREATE NONCLUSTERED COLUMNSTORE INDEX csindx_Table1 ON Table1 (DateKey, ProductKey, CustomerKey);