Github user fhueske commented on the pull request:
https://github.com/apache/flink/pull/1255#issuecomment-149203986
I think the right way to implement the range partitioner feature is to
inject the sampler during the JobGraph generation phase after the OptimizedPlan
has been created. This would allow to transparently handle range partitioning
during optimization and make it a completely runtime-related feature.
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