Github user shenh062326 commented on the pull request:
https://github.com/apache/spark/pull/5608#issuecomment-95908120
Sampling strategy not always works, but sampling twice are more effective
then only discarding the first non-null sample. And sampling 200 times will
not cause performance issues.
If you think the code shouldn't written like that, I aggree, I will change
it.
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