Symptoms

When you use columnstore indexes and run versioned scans (SI or RCSI) in SQL Server 2017 or 2019, you notice that the wrong result may return if tuple mover merge or alter index reorganize is running on the same table for a Compressed Rowgroup with 0 row count.

Resolution

This issue is fixed in the following cumulative updates for SQL Server:

Each new cumulative update for SQL Server contains all the hotfixes and security fixes that were in the previous build. We recommend that you install the latest build for your version of SQL Server:

Latest cumulative update for SQL Server 2019

Latest cumulative update for SQL Server 2017

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

References

Learn about the terminology that Microsoft uses to describe software updates.

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