zero323 commented on a change in pull request #26247: [SPARK-29566][ML] Imputer 
should support single-column input/output
URL: https://github.com/apache/spark/pull/26247#discussion_r367167581
 
 

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 File path: mllib/src/main/scala/org/apache/spark/ml/feature/Imputer.scala
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 @@ -205,6 +227,14 @@ class ImputerModel private[ml] (
 
   import ImputerModel._
 
+  /** @group setParam */
+  @Since("3.0.0")
+  def setInputCol(value: String): this.type = set(inputCol, value)
 
 Review comment:
   And what about overriding `inputCols` (taking a subset?)
   
       new 
Estimator().setInputCols(...).fit(...).setInputCols(...).transform(...)
   
   for that matter?

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