Github user kiszk commented on the issue:
https://github.com/apache/spark/pull/17587
@cloud-fan Good to see what plan is generated in your comment. People
(especially I) will forgot what plan we generated in the future.
When I saw the comment in `upCastToExpectedType`, I understood this PR. I
agree with @viirya' comment.
LGTM except this comment.
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