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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