Github user mengxr commented on a diff in the pull request: https://github.com/apache/spark/pull/8830#discussion_r40046365 --- Diff: mllib/src/main/scala/org/apache/spark/ml/feature/RFormulaParser.scala --- @@ -87,11 +129,17 @@ private[ml] case class ResolvedRFormula(label: String, terms: Seq[String]) */ private[ml] sealed trait Term +/** A term that may be part of an interaction, e.g. 'x' in 'x:y' */ +private[ml] sealed trait InteractionComponent extends Term + /* R formula reference to all available columns, e.g. "." in a formula */ -private[ml] case object Dot extends Term +private[ml] case object Dot extends InteractionComponent /* R formula reference to a column, e.g. "+ Species" in a formula */ -private[ml] case class ColumnRef(value: String) extends Term +private[ml] case class ColumnRef(value: String) extends InteractionComponent --- End diff -- This makes the implementation easier but code harder to understand, because a `ColRef` is not an interaction.
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