Github user vasia commented on the pull request:
https://github.com/apache/flink/pull/408#issuecomment-75557616
I had an offline discussion with @balidani and we figured that the
exception was actually coming from the test, not the GatherSumApplyIteration.
So, no issue here.
Regarding the `ResultTypeQueryable` interface and types, I will point you
to [this mailing list thread]
(https://mail-archives.apache.org/mod_mbox/flink-dev/201501.mbox/%3CCANC1h_vyjXgL=0ddgb6gihe3jmmz+nixn3sdgji+zgciz61...@mail.gmail.com%3E)
and [this doc]
(https://github.com/apache/flink/blob/master/docs/internal_types_serialization.md).
I hope these clear things up a bit :-)
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