Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/9092#issuecomment-154743585
I'm wondering now if we should set it to convert to lowercase by default.
I know it breaks behavior, but otherwise, we'll introduce an inconsistency in
the API (between Tokenizer and RegexTokenizer) which will be around for a long
time. What do you think?
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