Github user baishuo commented on the pull request:
https://github.com/apache/spark/pull/2157#issuecomment-53544332
thank you @chenghao-intel . I think I didnt express what I think clearly.
why there is a threadlocal is to ensure there is one and only one NumberFormat
instance in the same thread. othrewise, if open was called more than once,
there maybe more than one instance of NumberFormat
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