Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/11270#issuecomment-186470543
Also this is some best effort thing. I'd just pick one file to read and
test that, rather than testing all the files.
If a folder has mixed Parquet and other files, then unfortunately an error
will be thrown at runtime. I don't know how users will be able to read that
anyway.
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