Github user jaceklaskowski commented on a diff in the pull request: https://github.com/apache/spark/pull/12718#discussion_r61494448 --- Diff: mllib/src/main/scala/org/apache/spark/ml/feature/ChiSqSelector.scala --- @@ -79,11 +79,12 @@ final class ChiSqSelector(override val uid: String) @Since("2.0.0") override def fit(dataset: Dataset[_]): ChiSqSelectorModel = { + val sqlContext = dataset.sqlContext + import sqlContext.implicits._ + transformSchema(dataset.schema, logging = true) - val input = dataset.select($(labelCol), $(featuresCol)).rdd.map { - case Row(label: Double, features: Vector) => - LabeledPoint(label, features) - } + val input = dataset.select(col($(labelCol)).cast(DoubleType).as("label"), --- End diff -- Sorry, couldn't resist :) I'd change `"label"` to be a symbol `'label`. Not very widely used, but think it deserves its place in the code.
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