Github user kiszk commented on the issue:
https://github.com/apache/spark/pull/19222
@cloud-fan
I compared the performance of TPC-DS using modified maropu's script between
this PR and master.
I collected average performance of 20 trials of each query.
Here is [performance
data](https://docs.google.com/spreadsheets/d/1k28lbU1JuisQCUQM5g9invhtovnWjddu-1DKLTA03Hc/edit#gid=0).
Overall, we have not seen large regression. While only one query Q98 is 10%
slower, the best time is comparable.
WDYT?
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