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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