Github user viirya commented on the issue:
https://github.com/apache/spark/pull/21772
Let me clarify it. So this means that when `LongToUnsafeRowMap` is
broadcasted to executors, and it is too big to hold in memory, it will be
stored in disk. At that time, because `write` uses `cursor` to determine
`used`, it will write out nothing from `page` into disk.
Is this what you mean?
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