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[SPARK-1687] [PySpark] fix unit tests related to pickable namedtuple
serializer is imported multiple times during doctests, so it's better to make _hijack_namedtuple() safe to be called multiple times. Author: Davies Liu <davies.liu@gmail.com> Closes apache#1771 from davies/fix and squashes the following commits: 1a9e336 [Davies Liu] fix unit tests
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