Github user viirya commented on the issue:
https://github.com/apache/spark/pull/13772
@yhuai I've run test against current branch. When case-insensitive
resolution is used, exepctedColumns is not correct actually. So I am not sure
why you said it is not really broken? I will close this first because I think
this approach is not good. Maybe I will try alternative one later. Thanks!
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