Github user HyukjinKwon commented on the pull request:
https://github.com/apache/spark/pull/10980#issuecomment-188103804
I am closing this.
BTW, I think the issue itself is a little bit questionable at the end. If
we can apply the same rules for casting, then it would be great to re-use the
`Cast()` but both CSV and JSON data sources are dealing with data types
differently.
As long as we are not going to this behaviour for backwards compatibility,
I believe this issue is invalid or this will end up with some additional logics
like I just did in this PR with some cases to deal with the differences.
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