Github user budde commented on the issue:
https://github.com/apache/spark/pull/16797
> BTW, what behavior do we expect if a parquet file has two columns whose
lower-cased names are identical?
I can take a look at how Spark handled this prior to 2.1, although I'm not
sure if the behavior we'll see there was the result of a conscious decision or
"undefined" behavior.
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