Github user liancheng commented on the issue:
https://github.com/apache/spark/pull/16564
LGTM as long as we decide to preserve #15427.
The root cause of this issue is still the `df("col")` syntax, which is the
motivation behind #15427. We decided not to deprecate/remove this syntax to
ensure backward compatibility but maybe we should reconsider that decision as
it keeps causing issues and confuses users?
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