Github user jkbradley commented on a diff in the pull request: https://github.com/apache/spark/pull/17233#discussion_r105706598 --- Diff: mllib/src/main/scala/org/apache/spark/ml/feature/StringIndexer.scala --- @@ -39,20 +39,21 @@ import org.apache.spark.util.collection.OpenHashMap private[feature] trait StringIndexerBase extends Params with HasInputCol with HasOutputCol { /** - * Param for how to handle unseen labels. Options are 'skip' (filter out rows with - * unseen labels), 'error' (throw an error), or 'keep' (put unseen labels in a special additional + * Param for how to handle invalid data (unseen labels or NULL values). + * Options are 'skip' (filter out rows with invalid data), + * 'error' (throw an error), or 'keep' (put invalid data in a special additional * bucket, at index numLabels. --- End diff -- Add ")" at end: "numLabels)."
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