Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/8888#issuecomment-142811363
Thank you @andrewor14 for the explanation. I believe you're talking about
to reserve the data page in advanced via the
`UnsafeFixedWidthAggregationMap.map` (BytesToBytesMap), which will reserve the
data page in its constructor.
Everything looks reasonable to me now, the only concern is the performance,
since only a single data page available for the sort-based aggregation. Anyway,
it's not related to this fix.
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