Github user srowen commented on the issue:
https://github.com/apache/spark/pull/14260
Yeah that's the 'problem' -- consider `wc -l` which returns 0 for no input
at all. That explains the behavior now, where an empty partition results in a
partition of one element: "0". That seems a bit odd. It's not _that_ odd
because `pipe` is actually quite partition-oriented. I don't feel strongly
about changing the behavior of an empty partition though, if anyone thinks it
actual has the right semantics. But in any event the current behavior could be
documented better.
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