Github user hvanhovell commented on the pull request:
https://github.com/apache/spark/pull/11083#issuecomment-186834561
@rxin I agree that this is stretching the definitions of both
`Distribution` and `Partitioning`. We should be able to define the form/shape
in which a child node delivers it data to the current node. This would also
allow us to pass `ColumnarBatches`, or could even be used to specify the row
type passed. I have created https://issues.apache.org/jira/browse/SPARK-13421
to track this.
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