Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/19553#discussion_r147576141 --- Diff: core/src/main/scala/org/apache/spark/api/java/JavaUtils.scala --- @@ -43,10 +43,15 @@ private[spark] object JavaUtils { override def size: Int = underlying.size - override def get(key: AnyRef): B = try { - underlying.getOrElse(key.asInstanceOf[A], null.asInstanceOf[B]) - } catch { - case ex: ClassCastException => null.asInstanceOf[B] + // Delegate to implementation because AbstractMap implementation iterates over whole key set + override def containsKey(key: AnyRef): Boolean = key match { + case key: A => underlying.contains(key) --- End diff -- +1
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