Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/20229#discussion_r161345515
--- Diff: mllib/src/main/scala/org/apache/spark/ml/feature/RFormula.scala
---
@@ -25,7 +25,7 @@ import org.apache.hadoop.fs.Path
import org.apache.spark.annotation.{Experimental, Since}
import org.apache.spark.ml.{Estimator, Model, Pipeline, PipelineModel,
PipelineStage, Transformer}
import org.apache.spark.ml.attribute.AttributeGroup
-import org.apache.spark.ml.linalg.VectorUDT
+import org.apache.spark.ml.linalg.{Vector, VectorUDT}
--- End diff --
`Vector` is unused import here.
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