Github user davies commented on the pull request:
https://github.com/apache/spark/pull/1623#issuecomment-51020851
It's easy to extend pickle to support namedtuple, couldpickle and dill have
done in this way, but they are slow. We want to use cPickle for dataset, it
should be fast by default. I had not find an way to extend cPickle, do you have
any ideas?
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