Github user fhueske commented on the pull request:
https://github.com/apache/flink/pull/1838#issuecomment-203307525
I'm currently on vacation. Will have a closer look when I'm back in about a
week.
I am not sure that we need to touch the Join and CoGroup operators to pass
the distributions. The optimizer is able to get this from the GlobalProperties
to decide whether the partitionings are valid and equivalent.
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