Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/17527
Yea, that's the concern. The downside is when these are exposed to users.
However, it might be an advantage as well. The behavior doesn't depend on
default JVM locale and is consistent. I think the argument is the same with
[SPARK-18076](https://issues.apache.org/jira/browse/SPARK-18076).
If it is easy to leave out the exposed ones, I think that's also an option.
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