Github user viirya commented on a diff in the pull request: https://github.com/apache/spark/pull/21772#discussion_r204617884 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/joins/HashedRelation.scala --- @@ -772,6 +772,8 @@ private[execution] final class LongToUnsafeRowMap(val mm: TaskMemoryManager, cap array = readLongArray(readBuffer, length) val pageLength = readLong().toInt page = readLongArray(readBuffer, pageLength) + // Set cursor because cursor is used in write function. --- End diff -- maybe: `Restore cursor variable to make this map able to be serialized again on executors`?
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