Github user markhamstra commented on a diff in the pull request: https://github.com/apache/spark/pull/14332#discussion_r72014373 --- Diff: examples/src/main/scala/org/apache/spark/examples/ml/DataFrameExample.scala --- @@ -54,14 +54,13 @@ object DataFrameExample { } } - parser.parse(args, defaultParams).map { params => - run(params) - }.getOrElse { - sys.exit(1) + parser.parse(args, defaultParams) match { + case Some(params) => run(params) + case _ => sys.exit(1) } --- End diff -- It appears that you are reading what you want to see instead of what is really there. All of the examples in the Scala API doc involve side-effects. The three examples are essentially equivalent in their intent and effects, and using pattern matching with `Option` is clearly called out as the least idiomatic. `fold` isn't in question since it has already been ruled out by other Spark committers as beyond the ken of those unfamiliar with idiomatic functional programming. I see no reason, however, to do anything different in Spark's code than what the Scala API declares to be "most idiomatic way".
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