Github user moustaki commented on the pull request:
https://github.com/apache/spark/pull/5059#issuecomment-141298174
@marmbrus On your earlier documentation point, I was thinking that there
might be genuine cases where the actual location of a partition might not be
matching the expected partition structure, and where this check needs to be
disabled.
The case I just encountered was a unit test which was adding as a partition
a randomly generated temp directory using ALTER TABLE / ADD PARTITION, which
leads to an NPE in
https://github.com/apache/spark/pull/5059/files#diff-8887a877bd52611df9aea06ccfe3a2d7R166
when running a SELECT against the corresponding table.
Disabling the check using that configuration flag gets rid of that
exception. Really not sure how common that use-case is though.
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