GitHub user wzhfy opened a pull request:
https://github.com/apache/spark/pull/16430
[SPARK-17077] [SQL] Cardinality estimation project operator
## What changes were proposed in this pull request?
Support cardinality estimation for project operator.
## How was this patch tested?
Add a test case.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/wzhfy/spark projectEstimation
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16430.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 #16430
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commit 12a48fa528bfcd8119251cd585bcef9dd555d3a3
Author: Zhenhua Wang <[email protected]>
Date: 2016-12-29T03:07:11Z
project estimation
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