GitHub user hvanhovell opened a pull request:
https://github.com/apache/spark/pull/10015
[SPARK-12024][SQL] More efficient multi-column counting.
In https://github.com/apache/spark/pull/9409 we enabled multi-column
counting. The approach taken in that PR introduces a bit of overhead by first
creating a row only to check if all of the columns are non-null.
This PR fixes that technical debt. Count now takes multiple columns as its
input. In order to make this work I have also added support for multiple
columns in the single distinct code path.
cc @yhuai
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/hvanhovell/spark SPARK-12024
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/10015.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 #10015
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commit 3fe9cf3373a90c0a0d0bd6e75d44e13905e15458
Author: Herman van Hovell <[email protected]>
Date: 2015-11-27T11:03:28Z
More efficient multi-column counting.
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