Assume that you run INSERT statements into EXTERNAL TABLES by using PolyBase or Big Data Clusters (BDC) in SQL Server 2019. You may notice that the PUT operator addsspurious lines to the SQL Server error log at each initialization as follows:
Put operator initializing - ThreadId: %d - region handle %d - DOP: %d - HR: %d
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
This issue is fixed in thefollowing cumulative update for SQL Server:
Aboutcumulative updates for SQL Server:
Each new cumulativeupdate for SQL Server contains all the hotfixes and all the security fixes thatwere included with the previous cumulative update. Check out the latestcumulative updates for SQL Server: