Github user gengliangwang commented on the issue:
https://github.com/apache/spark/pull/22687
@viirya @HyukjinKwon I did the code changes and then I found the condition
is not reachable, as I have stated in PR description.
Just feel that it won't hurt to have such handling in data source module,
the changes in code is short.
I am OK to close this one.
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