Github user sethah commented on the pull request:
https://github.com/apache/spark/pull/9003#issuecomment-149260063
@mengxr I am working on it, and I have incorporated changes from the note
you posted on the [Jira](https://issues.apache.org/jira/browse/SPARK-10641) -
thanks for that! I pushed some changes. I had already changed the existing
implementation of stddev unfortunately, but I can revert those changes so that
the PR is a bit smaller. I was thinking that since variance hasn't been merged
yet, that I could include it in the PR, but if you think it's best to leave it
out I can do that as well.
I tested the imperative versions vs the codegen versions I had before and
they are significantly faster. I will work on getting the changes for stddev
reverted so that it will be ready for review.
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