Github user guowei2 commented on the pull request:
https://github.com/apache/spark/pull/1291#issuecomment-48691504
i think narrowing the flexibility of current implementation need to judge.
i don't think it's only a nice-to-have feature,
i think the modification in TransformedDStream and UnionDStream also should
be a improvement
and it does fix the situation.
if some place i modified does not suitable ,i'll be keeping improving it
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