Github user shenh062326 commented on the pull request:
https://github.com/apache/spark/pull/5608#issuecomment-94995027
@mateiz
In most case, the first sampling size is contain the shared objects, the
second will not. But if the arrray is large, and is only has a few not null
objects, it can be the second sampling contain shared objects, but the first
will not.
In order to exclude the shared objects, I use the min size to caculate the
result. It will not going wrong if there are no shared objects, I have test it.
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