Github user viirya commented on the pull request:
https://github.com/apache/spark/pull/12729#issuecomment-216245697
BTW, benchmark with two skewness.
codes:
test("skewness and skewness") {
val N = 50L << 20
runBenchmark("skewness and skewness", N) {
sqlContext.range(N).agg(skewness("id"), skewness("id")).collect()
}
}
old:
Java HotSpot(TM) 64-Bit Server VM 1.8.0_25-b17 on Linux
3.13.0-57-generic
Westmere E56xx/L56xx/X56xx (Nehalem-C)
skewness and skewness: Best/Avg Time(ms) Rate(M/s)
Per Row(ns) Relative
-------------------------------------------------------------------------------------------
skewness and skewness codegen=false 11623 / 11908 4.5
221.7 1.0X
skewness and skewness codegen=true 2405 / 2481 21.8
45.9 4.8X
new:
Java HotSpot(TM) 64-Bit Server VM 1.8.0_25-b17 on Linux
3.13.0-57-generic
Westmere E56xx/L56xx/X56xx (Nehalem-C)
skewness and skewness: Best/Avg Time(ms) Rate(M/s)
Per Row(ns) Relative
-------------------------------------------------------------------------------------------
skewness and skewness codegen=false 11570 / 12089 4.5
220.7 1.0X
skewness and skewness codegen=true 2008 / 2100 26.1
38.3 5.8X
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