Github user srowen commented on the issue:
https://github.com/apache/spark/pull/17527
I reverted the changes to UTF8String, StopWordsRemover, and Tokenizer. The
rest look like either purely internal string-insensitive comparison, excepting
operations on database table and column names. I wonder if those need to be
Locale-sensitive or not? it is not a question of input a user program may
process in that case, but of the user's application and data schema itself.
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