Github user MLnick commented on a diff in the pull request: https://github.com/apache/spark/pull/19715#discussion_r156323615 --- Diff: mllib/src/main/scala/org/apache/spark/ml/feature/QuantileDiscretizer.scala --- @@ -168,20 +168,13 @@ final class QuantileDiscretizer @Since("1.6.0") (@Since("1.6.0") override val ui @Since("2.3.0") def setOutputCols(value: Array[String]): this.type = set(outputCols, value) - private[feature] def isQuantileDiscretizeMultipleColumns(): Boolean = { - if (isSet(inputCols) && isSet(inputCol)) { - logWarning("Both `inputCol` and `inputCols` are set, we ignore `inputCols` and this " + - "`QuantileDiscretizer` will only map one column specified by `inputCol`") - false - } else if (isSet(inputCols)) { - true - } else { - false - } - } - private[feature] def getInOutCols: (Array[String], Array[String]) = { - if (!isQuantileDiscretizeMultipleColumns) { + require((isSet(inputCol) && isSet(outputCol) && !isSet(inputCols) && !isSet(outputCols)) || + (!isSet(inputCol) && !isSet(outputCol) && isSet(inputCols) && isSet(outputCols)), + "Only allow to set either inputCol/outputCol, or inputCols/outputCols" --- End diff -- I think a better message is something like `QuantileDiscretizer only supports setting either ...`
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