Github user maropu commented on the pull request:
https://github.com/apache/spark/pull/13372#issuecomment-222310137
yea, it is a difficult question. We must define explicit a behaviour for
`quote`, but I'm not sure about other options. So, An alternative idea is to
define a special function for `quote`, e.g., `getCharForQuote`, for the null
handling. Thought?
Anyway, yes, we need to document this change. After we get consensus, I'll
add this doc.
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