ozancicek commented on issue #24939: [SPARK-18569][ML][R] Support RFormula arithmetic, I() and spark functions URL: https://github.com/apache/spark/pull/24939#issuecomment-537475705 > It should be possible to read older models in newer versions, but not necessary to ensure that newer models are still readable in older versions -- although that's a nice to have if possible. @felixcheung Regarding changes to persistence, older models are possible to read in newer versions. Newer models should also be possible to read in older versions, the additional column to the persisted case class is added to the end without any changes in column ordering & model is saved as parquet. I've also extended the tests regarding whitespace. Let me know if you have anything additional in mind.
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