GitHub user maropu opened a pull request:
https://github.com/apache/spark/pull/15945
[SPARK-12978][SQL] Merge unnecessary partial aggregates
## What changes were proposed in this pull request?
This pr is to merge unnecessary partial aggregates if the inputs of
aggregates satisfy the distribution requirement of these partial aggregates.
This pr is rework based on the @cloud-fan 's suggestion in #14909.
## How was this patch tested?
Add tests in `PlannerSuite` to check if these partial aggregates are
removed by catalyst.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/maropu/spark SPARK-12978
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15945.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 #15945
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commit 2633ceddf5d10472aea0e33ca5d5f0022879dbc5
Author: Takeshi YAMAMURO <linguin....@gmail.com>
Date: 2016-11-20T15:25:56Z
Merge unnecessary partial aggregates
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