WindowedStream sum behavior

Posted by Elias Levy on
URL: http://deprecated-apache-flink-user-mailing-list-archive.369.s1.nabble.com/WindowedStream-sum-behavior-tp6035.html

I am wondering about the expected behavior of the sum method.  Obviously it sums a specific field in a tuple or POJO. But what should one expect in other fields?  Does sum keep the first field, last field or there aren't any guarantees?