Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/11965#discussion_r57488935
--- Diff: mllib/src/main/scala/org/apache/spark/ml/feature/RFormula.scala
---
@@ -125,6 +125,7 @@ class RFormula(override val uid: String)
encoderStages += new StringIndexer()
.setInputCol(term)
.setOutputCol(indexCol)
+ prefixesToRewrite(indexCol + "_") = term + "_"
--- End diff --
With the bug fix, this now needs to be added. RFormula tests for
factor-numeric and factor-factor interactions fail otherwise because of
prefixes like "stridx_ie94k9ef90127_"
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