GitHub user rxin opened a pull request:
https://github.com/apache/spark/pull/8332
[SPARK-10100][SQL] Eliminate hash table lookup if there is no grouping key
in aggregation.
This improves performance by ~ 20 - 30% in one of my local test and should
fix the performance regression from 1.4 to 1.5 on ss_max.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/rxin/spark SPARK-10100
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/8332.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 #8332
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commit 4dc723d9534bf037fead25fbeb1edfa27bbfbc01
Author: Reynold Xin <[email protected]>
Date: 2015-08-20T07:16:45Z
[SPARK-10100][SQL] Eliminate hash table lookup if there is no grouping key
in aggregation.
This improves performance by ~ 20% in one of my local test.
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