Github user mgaido91 commented on the issue:
https://github.com/apache/spark/pull/21529
thanks for your review @cloud-fan. Nice catch on the `transformUp`! I
addressed all your comments.
As far as the followup is regarded, we should decide if we want to support
the possibility that with different configs we get different results or not. In
the second case we have more flexibility, but we have also to be much more
careful in order not to introduce bugs when different configs should not
produce different results. Moreover, we would also have many more golden
files...
What do you think?
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