Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/5199#discussion_r28199545
--- Diff:
core/src/main/scala/org/apache/spark/util/collection/CompactBuffer.scala ---
@@ -152,6 +152,20 @@ private[spark] class CompactBuffer[T: ClassTag]
extends Seq[T] with Serializable
}
private[spark] object CompactBuffer {
+ def constantEmpty[T: ClassTag](): CompactBuffer[T] = new
CompactBuffer[T] {
--- End diff --
Is this really worth creating a new class for? Creating new subclasses can
actually affect how JIT is going to inline things so might end up degrading
performance.
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