Github user jamesclampffer commented on the issue:
https://github.com/apache/orc/pull/134
Those errors should go away after HDFS-10787 is finished (or applied to the
PR temporarily) since it exposes an API to get at the configuration without
using std::tr2::optional. We had to suppress a bunch of errors coming from
optional when it was added to libhdfs++; eventually I'd like to get rid of the
remaining uses of it in the implementation as well.
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