Github user gatorsmile commented on the issue: https://github.com/apache/spark/pull/15677 Sorry, I am confusing the merging standards. Why can we accept merging something incorrect? Just like `reverse`, to the external users, the argument type of `str` is not `a string expression`. How can our users know some types are implicitly casted but some other types are not able to cast? This is not the only example. We have many cases like this. Anyway, if this PR is merged, I hope we keep the same standard in the other PRs. Based on my observations, we reversed multiple PRs that improved the codes but did not perfectly resolved the problem.
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