FIX: Access violation occurs when you run a batch-mode query with UNION statement in SQL Server 2017

Applies to: SQL Server 2017 Developer WindowsSQL Server 2017 Enterprise Core WindowsSQL Server 2017 Enterprise Windows

Symptoms


When you run a batch-mode query with UNION statement in SQL Server 2017, the query fails because of an access violation (AV).

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:

References


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