Github user marmbrus commented on the issue:
https://github.com/apache/spark/pull/17371
I really think the core problem here is that we allow you to use resolved
attributes at all in the user API. Unfortunately we are somewhat stuck with
that bad decision. Personally, I never use `df['col']` and only ever use
`col("col")` since that avoids the problem.
However, I don't think that piecemeal switching to unresolved attributes is
a good idea.
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