Github user tdas commented on the pull request:
https://github.com/apache/spark/pull/2192#issuecomment-57539843
This is not a good idea. Not returning an RDD can mess up a lot of the
logic and semantics. For example if there is a transform() followed by
updateStateByKey(), the result will be unpredictable. updateStateByKey expects
the previous batch to have a state RDD. If it does not find any state RDD it
will assume that this the start of the streamign computation and effectively
initialize again, forgetting the previous states from 2 batches ago. So this
change is incorrect.
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