KB4577590 - FIX: Error occurs when row width is less than DMS buffer size of 32K and an incorrect return path is chosen in SQL Server 2019

Symptoms

When you have a table with large number of columns that are nullable in SQL Server 2019 and the row width size calculation falls short of the maximum DMS buffer size of 32K, you may receive an error. In addition, an incorrect return path is chosen.

Status

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

Resolution

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

About cumulative updates for SQL Server:

Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server:

Workaround

To work around this issue, you can add views on top of the table and reduce the columns that are selected on a single table\view.

References

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

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