Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/17527 If you refer column names being `ı` from `I` in Turkish locale, it might be correct per the discussion above as they are correct lower cases in Turkish locale. I would like to know and verify which test case failures make you assert we still have a few bugs in the locale support. The burden of proof should be yours if you think we still have the bugs and say this PR is incomplete due to this. If there are, we should make a followup and I am willing to track it down.
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