GitHub user davies opened a pull request:
https://github.com/apache/spark/pull/10960
[SPARK-12963] Improve performance of stddev/variance
As benchmarked and discussed here:
https://github.com/apache/spark/pull/10786/files#r50038294, benefits from
codegen, the declarative aggregate function could be much faster than
imperative one.
This PR is based on #10944
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/davies/spark stddev
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/10960.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #10960
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commit b4db00675bc3c51ddf8735cace522a5d771cf7e2
Author: Davies Liu <dav...@databricks.com>
Date: 2016-01-27T07:43:40Z
cleanup whole stage codegen
commit 70a7c7edd1988c7dd69bccc8e563c9943775bd2c
Author: Davies Liu <dav...@databricks.com>
Date: 2016-01-27T23:22:33Z
improve stddev and variance
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