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Antoine PitrouDavid Li
4c6e1b9932c
Antoine Pitrou authored and David Li committed 4801e433582
ARROW-6248: [Python][C++] Raise better exception on HDFS file open error

libhdfs sets `errno` to a value corresponding to the Java exception
(see hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfs/exception.c in Hadoop repo),
we can use that value to return a more informative error to the user.

Closes #9949 from pitrou/ARROW-6248-hdfs-errno

Authored-by: Antoine Pitrou <antoine@python.org>
Signed-off-by: David Li <li.davidm96@gmail.com>