Github user gengliangwang commented on the issue:
https://github.com/apache/spark/pull/22311
> We may also need to change the outputColumns in DataWritingCommand
afterward, to avoid it is changed after optimization.
After second thought, I will create PR to fix `outputColumns` first. It
takes time to cover all the cases by changing optimizer rules.
Mark this PR as "WIP" for now.
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