Github user jiangxb1987 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/20292#discussion_r163149674
  
    --- Diff: 
core/src/main/scala/org/apache/spark/util/collection/ExternalAppendOnlyMap.scala
 ---
    @@ -509,8 +509,8 @@ class ExternalAppendOnlyMap[K, V, C](
          */
         private def readNextItem(): (K, C) = {
           try {
    -        val k = deserializeStream.readKey().asInstanceOf[K]
    -        val c = deserializeStream.readValue().asInstanceOf[C]
    +        val k = deserializeStream.get.readKey().asInstanceOf[K]
    --- End diff --
    
    We should still check `deserializeStream` is not emtpy here to be safe


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