Github user marmbrus commented on the issue:
https://github.com/apache/spark/pull/16564
Hmm, I'm not sure that I agree with the solution from #15427. I do not
think that it should be valid to have to different expressions that have the
same expression id. There are many case where we break the `df("col")` syntax
by adding new operations, and I don't think it is worth that hack to preserve
this particular case with drop duplicates.
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