GitHub user wzhfy opened a pull request:
https://github.com/apache/spark/pull/16431
[SPARK-19020] [SQL] Cardinality estimation of aggregate operator
## What changes were proposed in this pull request?
Support cardinality estimation of aggregate operator
## How was this patch tested?
Add test cases
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/wzhfy/spark aggEstimation
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16431.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 #16431
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commit c0645952aef0455ac0ad6cefc6de9e624813c7bc
Author: Zhenhua Wang <wzh_...@163.com>
Date: 2016-12-29T06:34:40Z
agg estimation
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