Github user fhueske commented on the pull request:
https://github.com/apache/flink/pull/1255#issuecomment-155052860
I just realized we also need to make the optimizer aware that two
auto-sampled range partitionings are not equivalent. These checks the to be
added to the `areCompatible()` methods of the `AbstractJoinDescriptor` and
`CoGroupDescriptor` to avoid incorrect joins and coGroups.
For now, it is sufficient to simply return `false` if a range partitioning
is observed for a join or coGroup. Later, we want to add a property to the
`GlobalProperties` that identifies the data distribution which is used for the
range partitioning.
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