Github user jerryshao commented on the pull request:
https://github.com/apache/spark/pull/1327#issuecomment-48565390
IMHO, if we leave reuse of this object aside, I don't think this change
will bring specific effect to the current code path. If we really want to
defend the reuse of this object, there's no conflict with adding closed flag.
Also this change align with other field which are all initialized in the
initialize(), not constructor....
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