Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/7879#discussion_r36049316
--- Diff: mllib/src/main/scala/org/apache/spark/ml/feature/RFormula.scala
---
@@ -63,31 +61,26 @@ class RFormula(override val uid: String) extends
Estimator[RFormulaModel] with R
*/
val formula: Param[String] = new Param(this, "formula", "R model
formula")
- private var parsedFormula: Option[ParsedRFormula] = None
--- End diff --
I removed it because there are multiple places to set params. We need to
parse the input formula just-in-time.
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