Assume that you have Microsoft SQL Server 2014, 2016 and 2017 installed. You have a table column that contains many null values, and you execute a query on that table by using the default Cardinality Estimator (CE). In this scenario, you may experience an overestimation in a filter that compares the table column to a value that's unknown at compile time.
This issue is fixed in the following 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:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Learn about the terminology Microsoft uses to describe software updates.