Github user viirya commented on the issue:
https://github.com/apache/spark/pull/16724
@cloud-fan Is the current change not suitable? We can change it to only
preserve data order when specifying partitioning and no bucketing for the
output.
This change only adds a new constructor to `UnsafeKVExternalSorter`. No
other API change I think. As the data output is going through this external
sorter, it definitely changes the data order without this change. I think we
may not be able to preserve data order with a workaround which doesn't touch
`UnsafeKVExternalSorter`.
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