Github user hvanhovell commented on the pull request:
https://github.com/apache/spark/pull/9566#issuecomment-155578114
I'll rebase.
The potential bug is caused by the fact that the attributes for the
distinct columns and the expressions for the distinct columns can possibly be
misaligned. This currently relies on the fact that a sequence maintains the
same order as a (hash) map derived from it. This currently works, but is not
guaranteed by the scala collections library. I'd rather fix this, than to wait
for something to go wrong.
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