srowen commented on a change in pull request #24431:
[SPARK-27536][CORE][ML][SQL][STREAMING] Remove most use of
scala.language.existentials
URL: https://github.com/apache/spark/pull/24431#discussion_r278564827
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File path: mllib/src/main/scala/org/apache/spark/ml/image/HadoopUtils.scala
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@@ -103,16 +102,16 @@ private object SamplePathFilter {
// scalastyle:off hadoopconfiguration
val hadoopConf = spark.sparkContext.hadoopConfiguration
// scalastyle:on hadoopconfiguration
- val old = Option(hadoopConf.getClass(flagName, null))
+ val old = hadoopConf.getClass(flagName, null)
Review comment:
Same sort of issue: assigning `Option[Class[_]]` caused the warning. Here it
seemed as fine to stick with the underlying null vs not-null.
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