Github user sarutak commented on the pull request:
https://github.com/apache/spark/pull/12939#issuecomment-219931480
Lots of punctuation characters like `*`, `+` can be used as an operator in
expressions so I'm afraid comments in generated code will be difficult to read
if characters are removed based on the whitelist.
On the other hand, I noticed my another PR (#12979) can keep the
readability of the comment and the safety.
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