Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19156#discussion_r149641037
--- Diff: mllib/src/main/scala/org/apache/spark/ml/stat/Summarizer.scala ---
@@ -60,15 +61,18 @@ sealed abstract class SummaryBuilder {
* This class lets users pick the statistics they would like to extract
for a given column. Here is
* an example in Scala:
* {{{
- * val dataframe = ... // Some dataframe containing a feature column
- * val allStats = dataframe.select(Summarizer.metrics("min",
"max").summary($"features"))
- * val Row(Row(min_, max_)) = allStats.first()
+ * import org.apache.spark.ml.linalg._
+ * import org.apache.spark.sql.Row
--- End diff --
nit: indent
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