Github user ggevay commented on the pull request:
https://github.com/apache/flink/pull/1724#issuecomment-190143075
> I am not quite sure even, if Tuple subclasses have to be POJOs.
I wrote that based on the comment at TypeExtractor.java:1687. (I also tried
adding a check there for the result of the analyzePojo call being null, and
calling privateGetForClass in this case, but then I get an exception from
TypeExtractor.java:1379.)
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