Github user jaceklaskowski commented on the issue:
https://github.com/apache/spark/pull/14891
Frankly, I'd not have bothered with the changes if I had not seen them
elsewhere. See
http://spark.apache.org/docs/latest/api/scala/index.html#org.apache.spark.sql.Dataset
and look for `foreach` and `foreachPartition` for (Java-specific) while
http://spark.apache.org/docs/latest/api/scala/index.html#org.apache.spark.sql.Encoders$
and `javaSerialization` / `kryo` for (Scala-specific). I have seen examples
with both in one source like
http://spark.apache.org/docs/latest/api/scala/index.html#org.apache.spark.sql.RelationalGroupedDataset.
That was the main reason while the other was to understand why there are two
different variants of the same method (and then it clicked but only when I'd
seen the other examples).
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