Github user srowen commented on the issue:
https://github.com/apache/spark/pull/17527
Yes that's certainly the question. Is it more surprising or less surprising
for Lower()'s behavior to vary by machine's Locale? Generally I'd say that the
varying behavior is bad. However in this case we also don't have a standard way
of letting users specify the Locale. It becomes impossible to get the
Turkish-lower-cased version of a string via the API.
For that reason I could see backing out changes that affect user
application strings, to be conservative. We could decide to change that later.
The issue here really stems from lowercasing of purely internal strings.
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