Github user balidani commented on the pull request:
https://github.com/apache/flink/pull/408#issuecomment-75546102
Hi @vasia!
Thanks for the review! I started making the changed, but I got stuck. I get
an exception about `GatherUdf` not being Serializable. I tried copying from
`VertexCentricIteration` and I'm not sure what's the difference that causes the
exception.
Here is the full stack trace:
https://gist.github.com/balidani/e6f716d3562d2aa131fb
Here is `GatherSumApplyIteration.java`:
https://gist.github.com/balidani/1139eddcb1b4cbf60404
The GatherUdf is at the end. I didn't bother fully converting the Sum and
Apply UDFs, because I already get an exception for gather.
What exactly is `ResultTypeQueryable`? Does it have anything to do with
Serializability? Should we implement this with all UDFs, just like in
`VertexCentricIteration`?
Cheers!
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