[GitHub] [spark] srowen commented on a diff in pull request #37876: [SPARK-40175][CORE][SQL][MLLIB][STREAMING] Optimize the performance of `keys.zip(values).toMap` code pattern

[GitBox <gi...@apache.org>]

srowen commented on code in PR #37876:
URL: https://github.com/apache/spark/pull/37876#discussion_r970753044


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mllib/src/main/scala/org/apache/spark/mllib/evaluation/RankingMetrics.scala:
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@@ -153,9 +153,10 @@ class RankingMetrics[T: ClassTag] @Since("1.2.0") (predictionAndLabels: RDD[_ <:
   def ndcgAt(k: Int): Double = {
     require(k > 0, "ranking position k should be positive")
     rdd.map { case (pred, lab, rel) =>
+      import org.apache.spark.util.collection.Utils

Review Comment:
   No big deal but why import here?



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