Github user srowen commented on a diff in the pull request:

    https://github.com/apache/spark/pull/19168#discussion_r137780881
  
    --- Diff: 
core/src/main/scala/org/apache/spark/storage/ShuffleBlockFetcherIterator.scala 
---
    @@ -157,7 +157,14 @@ final class ShuffleBlockFetcherIterator(
       private[storage] def releaseCurrentResultBuffer(): Unit = {
         // Release the current buffer if necessary
         if (currentResult != null) {
    --- End diff --
    
    I can't evaluate the change, but, the 'null' case is now already handled by 
your `case _`


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