Github user omalley commented on the issue:
https://github.com/apache/orc/pull/132
There are a couple of problems with enums in Protobuf... The main is that
if it is an unknown value (from a future version) it becomes unset. It is
important that we can tell the difference between an unset value (orc java
writer) and some future writer implementation. It is also useful to be able to
print the value of the unknown enum.
Obviously I wasn't aware of the problems when I wrote the original version
of orc_proto.proto. I probably should go through and convert them all to
integers.
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