Github user kiszk commented on the issue:
https://github.com/apache/spark/pull/22361
@gatorsmile Overall, I agree with revert since performance degradation is
confirmed.
When I run the TPC-DS in #19222, I have not seen such a performance
regression as
[here](https://github.com/apache/spark/pull/19222#issuecomment-378154854). For
future analysis, I am very interested in
* execution time of each query
* environment (machine, os, jvm, cluster or local, ...)
* scaling factor,
* # of repeats per query
* others
@npoggi and @winglungngai Thanks for your investigations. Would it be
possible to share the avobe information?
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