Github user viirya commented on the pull request:
https://github.com/apache/spark/pull/11578#issuecomment-194664538
When `withReplacement = true`.
Without generated code for sample():
Intel(R) Core(TM) i7-5557U CPU @ 3.10GHz
range/sample/sum: Best/Avg Time(ms) Rate(M/s)
Per Row(ns) Relative
-------------------------------------------------------------------------------------------
range/sample/sum codegen=false 55656 / 56490 9.4
106.2 1.0X
range/sample/sum codegen=true 35423 / 35758 14.8
67.6 1.6X
With generated code for sample():
Intel(R) Core(TM) i7-5557U CPU @ 3.10GHz
range/sample/sum: Best/Avg Time(ms) Rate(M/s)
Per Row(ns) Relative
-------------------------------------------------------------------------------------------
range/sample/sum codegen=false 53058 / 54023 9.9
101.2 1.0X
range/sample/sum codegen=true 33153 / 33509 15.8
63.2 1.6X
So when `withReplacement = true`, the difference is insignificant.
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