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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