Github user aarondav commented on the pull request:
https://github.com/apache/spark/pull/1327#issuecomment-48367468
This class has historically been "almost-reusable", but since there was
never any need to actually reuse it within Spark itself, the effort wasn't
completed. I'm not sure if this change is sufficient, but doing this
initialization in open() rather than the constructor seems marginally cleaner
anyway. Unless, @mridulm, you have a case in mind where this will cause an
issue.
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