Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/4074#issuecomment-70301808
This is all there is to it. It's just a convenience method that implements
the check efficiently. Given several questions on the list, it seems that
people do want to test for an empty RDD and there hasn't been an accepted way
to do it that is faster than `count() == 0`:
http://apache-spark-user-list.1001560.n3.nabble.com/Testing-if-an-RDD-is-empty-td1678.html#a1679
... and of course
http://issues.apache.org/jira/browse/SPARK-5270
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