Github user viirya commented on the pull request:
https://github.com/apache/spark/pull/11578#issuecomment-194665698
From the benchmark, using generated codes of sample() much benefits to the
case `withReplacement = false`. I think it is because there are many branches
in the sample() of `BernoulliCellSampler`. The sample() of `PoissonSampler` is
simpler.
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