Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/12414#discussion_r118307768
--- Diff: mllib/src/main/scala/org/apache/spark/ml/feature/RFormula.scala
---
@@ -163,12 +163,20 @@ class RFormula @Since("1.5.0") (@Since("1.5.0")
override val uid: String)
}.toMap
// Then we handle one-hot encoding and interactions between terms.
+ var hasReferenceCategory = false
--- End diff --
because then the 2nd condition `!hasReferenceCategory` is always true on
L175
https://github.com/apache/spark/pull/12414/files#diff-bedaa993ebc2cc2e0d496859095270feR175
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