Github user ggevay commented on the issue:
https://github.com/apache/flink/pull/2094
@rmetzger Thanks for looking at it.
> Is there a reason why the DataSet methods for "sum()" for example do not
allow to aggregate on POJOs with this change?
The reason is just that i didn't have time to do it. But I think it could
be done in a few hours. I'll open a JIRA.
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