Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/8881#issuecomment-142897772
@jhu-chang I still don't see why you say a user can write logic to return a
null RDD, but can't write an if statement to handle it? a user who can use
`DStream` is surely capable of this. I think it's more surprising if you're
allowed to make a transformation that returns nothing, yet write a program that
tries to use it.
What is the problem with an empty RDD? Returning an empty RDD is not the
same as what you're suggesting. It's an RDD that has nothing in it. It's
meaningful to operate on it further. If the application doesn't wish to, it can
write logic to do something different for an RDD.
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