Github user shivaram commented on the pull request:
https://github.com/apache/spark/pull/377#issuecomment-43116145
Thanks @patmcdonough . There is one known source of error in that when we
have a large array we sample some items from it for size estimation and then
scale it by the number of items. When I find some time, I'll try to see if
there are other problems.
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