Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/6452#discussion_r31271301
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/feature/VectorAssembler.scala ---
@@ -46,19 +47,59 @@ class VectorAssembler(override val uid: String)
def setOutputCol(value: String): this.type = set(outputCol, value)
override def transform(dataset: DataFrame): DataFrame = {
+ // Schema transformation.
+ val schema = dataset.schema
+ lazy val first = dataset.first()
+ val attrs = $(inputCols).flatMap { c =>
--- End diff --
This does not remove "index" from attributes. Should it remove or fix that
field? (It's sort of odd that attributes have an index field.)
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