Github user sarutak commented on a diff in the pull request:
https://github.com/apache/spark/pull/3789#discussion_r22250287
--- 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 --
I thought it should be `A` but the type parameter at the position is no
mean because the erasure removes type information at the time of compile.
Even though, should we place `A` for readability?
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