Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/8881#issuecomment-142854071
@jhu-chang you can write application logic that selectively performs
additional operations or not on an RDD depending on whether it's empty. It's
just an if statement.
Why would the lineage of the empty RDD matter? indeed, it's better if it's
known to be empty without recomputing anything. Why would something not be
computed -- the point is that you're deciding how to continue based on the
result of some RDD that _was_ computed.
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