FIX: Queries that casts string or binary data to XML take a long time to compile in SQL Server 2016 and 2017

Applies to: SQL Server 2016 Service Pack 1SQL Server 2016 DeveloperSQL Server 2016 Enterprise More

Symptoms


Assume that you run a query that casts string or binary data to Extended Markup Language (XML) datatype in Microsoft SQL Server 2016 and 2017. You may notice that the compilation time taken by the query might be much longer when compared to the compilation time taken in the earlier versions of SQL Server. 

Resolution


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

       Cumulative Update 4 for SQL Server 2017

       Cumulative Update 7 for SQL Server 2016 SP1

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.