Assume that you use AlwaysOn Availability Group (AG) in Microsoft SQL Server. When you execute a query that retrieves data by using non-clustered index seek together with a clustered columnstore index on a secondary replica, the query may take much longer to complete than when it is executed on the primary replica.
Or, assume that you have a non-clustered index on a clustered columnstore index, and Snapshot Isolation level is used. When you execute a query that retrieves data by using non-clustered index seek together with clustered columnstore index key lookup, query execution may also be slow.
This fix is included in the following updates:
Cumulative Update 6 for SQL Server 2016 Service Pack 1
Cumulative Update 9 for SQL Server 2016
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Each new build for SQL Server contains all the hotfixes and security fixes that were in the previous build. We recommend that you install the latest cumulative updates for SQL Server:
Latest cumulative update for SQL Server 2017
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
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