GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/14876
showcase, DO NOT MERGE
## What changes were proposed in this pull request?
this is another approach to fix SPARK-12978, which was done in
https://github.com/apache/spark/pull/10896
## How was this patch tested?
new test in PlannerSuite
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark agg
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/14876.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 #14876
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commit a5b6d7140cf0de3bab75788fd32b497a8817c93c
Author: Wenchen Fan <[email protected]>
Date: 2016-08-30T14:44:49Z
remove unnecessary partial aggregate
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