Github user dain commented on the issue:
https://github.com/apache/orc/pull/163
We were considering doing this internally and then we ran into a production
bug where files got truncated to zero bytes. Since empty files are illegal we
could find all of the effected partitions easily, but without this you would be
stuck. A good work around would be to require empty files to end with ".empty"
but I'm not sure you can do that with M/R.
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