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

    https://github.com/apache/spark/pull/21772#discussion_r204276886
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/joins/HashedRelation.scala
 ---
    @@ -770,8 +771,10 @@ private[execution] final class LongToUnsafeRowMap(val 
mm: TaskMemoryManager, cap
         val length = readLong().toInt
         mask = length - 2
         array = readLongArray(readBuffer, length)
    -    val pageLength = readLong().toInt
    -    page = readLongArray(readBuffer, pageLength)
    +    val usedWordsNumber = readLong().toInt
    +    // Set cursor because cursor is used in write function.
    +    cursor = usedWordsNumber * 8 + Platform.LONG_ARRAY_OFFSET
    +    page = readLongArray(readBuffer, usedWordsNumber)
    --- End diff --
    
    ditto. Can you just update `cursor` and revert other unrelated change?


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