Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/9380#issuecomment-155224857
Which part is boxing the result? I tested the following on master with
changes from #9480:
~~~scala
val df = sqlContext.range(100000000)
df.select(var_samp("id")).show(); // ~7.5s
df.select(stddev_samp("id")).show() // ~10s
~~~
Both have low GC activities.
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