Github user shenh062326 commented on the pull request:
https://github.com/apache/spark/pull/5608#issuecomment-95904531
@srowen
The last assertResult I have add in the testcase is the case that can't
only discarding the first non-null sample, because half of the array elems are
not link to the shared object, if the first non-null sample (which generate by
random) is not link to the shared object, we can't exclude the shared object.
But if we sampling twice, even if the twice has not exclude the shared object,
it can also work.
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