Github user srowen commented on the issue:
https://github.com/apache/spark/pull/17527
The general idea is to leave any lower-casing that affects strings in the
user program alone, to use the locale-sensitive `toLowerCase()`. This is more
conservative. All of the changes should only affect internal strings or API
values, where there is no reason to be locale-specific. For example: checking a
property value against a known list of enum string values in a case-insensitive
way. This should address the underlying problem, where lower-casing an internal
property results int he wrong result in the Turkish locale, without changing
the results of a user program.
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