The documentation at
https://spark.apache.org/docs/1.0.0/api/scala/index.html#org.apache.spark.streaming.dstream.DStream
describes the union() method as

"Return a new DStream by unifying data of another DStream with this
DStream."

Can somebody provide a clear definition of what "unifying" means in this
context?  Does it append corresponding elements together?  Inside a wider
tuple if need be?

I'm hoping for something clear enough that it could just be added to the doc
page if the developers so chose.



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