Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/3789#discussion_r22249340
--- Diff: core/src/main/scala/org/apache/spark/api/java/JavaUtils.scala ---
@@ -80,7 +80,7 @@ private[spark] object JavaUtils {
prev match {
case Some(k) =>
underlying match {
- case mm: mutable.Map[a, _] =>
+ case mm: mutable.Map[_, _] =>
--- End diff --
Should this really be `A` to express the relation to the generic bound? although `underlying`
must already have keys of type `A` already. It just looks like that was the intent.
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