[GitHub] spark pull request #21772: [SPARK-24809] [SQL] Serializing LongHashedRelatio...

Wed, 18 Jul 2018 05:51:01 -0700 

Github user liutang123 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/21772#discussion_r203365167
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/joins/HashedRelation.scala
 ---
    @@ -726,8 +726,9 @@ private[execution] final class LongToUnsafeRowMap(val 
mm: TaskMemoryManager, cap
     
         writeLong(array.length)
         writeLongArray(writeBuffer, array, array.length)
    -    val used = ((cursor - Platform.LONG_ARRAY_OFFSET) / 8).toInt
    -    writeLong(used)
    +    val cursorFlag = cursor - Platform.LONG_ARRAY_OFFSET
    +    writeLong(cursorFlag)
    +    val used = (cursorFlag / 8).toInt
    --- End diff --
    
    
![image](https://issues.apache.org/jira/secure/attachment/12932027/Spark%20LongHashedRelation%20serialization.svg)



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