Assume that you have a table that has a Clustered Columnstore Index in Microsoft SQL Server 2016. You run a query that has a non-distinct aggregate over a string column against this table. For example, you run SELECT COUNT_BIG(MyStringColumn) from MyClusteredColumnstoreTable. In this scenario, an access violation error occurs.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.