Github user reggert commented on the issue:
https://github.com/apache/spark/pull/15899
The only other weird case I've run into is trying to `flatMap` across
multiple RDDs, e.g., `for (x <- rdd1; y <- rdd2) yield x + y`, but it simply
won't compile because `RDD.flatMap` doesn't support it (for good reason). You
_can_ do it for an RDD and a regular collection, e.g., `for (x <- rdd; y <- 1
to 10) yield x + y`, which is a perfectly reasonable use case. Other than that,
the only issues that I'm aware of are ones that would also affect regular
(desugared) chained method calls.
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