Github user WeichenXu123 commented on a diff in the pull request: https://github.com/apache/spark/pull/20904#discussion_r181018223 --- Diff: mllib/src/main/scala/org/apache/spark/ml/stat/KolmogorovSmirnovTest.scala --- @@ -81,32 +81,37 @@ object KolmogorovSmirnovTest { * Java-friendly version of `test(dataset: DataFrame, sampleCol: String, cdf: Double => Double)` */ @Since("2.4.0") - def test(dataset: DataFrame, sampleCol: String, - cdf: Function[java.lang.Double, java.lang.Double]): DataFrame = { - val f: Double => Double = x => cdf.call(x) - test(dataset, sampleCol, f) + def test( + dataset: Dataset[_], + sampleCol: String, + cdf: Function[java.lang.Double, java.lang.Double]): DataFrame = { + test(dataset, sampleCol, (x: Double) => cdf.call(x)) --- End diff -- [SPARK-23751][FOLLOW-UP] fix build for scala-2.12
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