GitHub user adrian-wang opened a pull request:
https://github.com/apache/spark/pull/4415
[SPARK-5642] [SQL] Apply column pruning on unused aggregation fields
select k from (select key k, max(value) v from src group by k) t
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/adrian-wang/spark groupprune
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/4415.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 #4415
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commit ce99ea14c376e2c568f722d91d479772b11753d9
Author: Daoyuan Wang <[email protected]>
Date: 2015-02-06T03:01:27Z
add a prune rule for grouping set
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