Github user holdenk commented on the pull request:
https://github.com/apache/spark/pull/9709#issuecomment-157626540
So if I understand the change correctly this will treat null values the
same as the string "null" yes? If we do this we should document that behavior
(it seems like a reasonable approach provided this is the standard but maybe
add a comment so people aren't caught by surprise)? It might also make sense to
have this be configurable (as per @jkbradley's comments in the JIRA).
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