Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/8888#issuecomment-142779662
https://github.com/apache/spark/blob/master/core/src/main/java/org/apache/spark/util/collection/unsafe/sort/UnsafeExternalSorter.java#L138
Seems reserve the data page only if the `existingInMemorySorter` is unset,
however, SPARK-474 is not this case right? As it follows the sort merge join
operator.
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