Github user WeichenXu123 commented on the issue:
https://github.com/apache/spark/pull/19565
Yes I think when dataset is large enough, using the same
`miniBatchFraction`, the result RDD size of "filter before sample" and "filter
after sample" will be asymptotically equal, no matter how many empty elements
in dataset. (correct me if I am wrong, I am a little confused about
"miniBatchFraction should be adjusted proportionally", if adjusted, then
asymptotically equality is broken?) If So, does it really effect the algo ?
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