Github user HyukjinKwon commented on the pull request:
https://github.com/apache/spark/pull/11947#issuecomment-202682552
For codes, overall, it looks good to me. However, I am not used to and have
a lot of experience of dealing with `NaN`, `Inf ` or `-Inf`. If the values can
be different in many cases, I think it is reasonable.
Nevertheless, I feel a bit questionable for the options for `null` for each
type.
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