GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/11341
[SPARK-13466][SQL] Don't introduce redundant project with colum pruning rule
JIRA: https://issues.apache.org/jira/browse/SPARK-13466
## What changes were proposed in this pull request?
With column pruning rule in optimizer, we will introduce redundant project
for some cases. We should prevent it.
## How was the this patch tested?
Unit test is added into ColumnPruningSuite.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 remove-redundant-project
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11341.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 #11341
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commit 7f0dd87b1df4aac53d00d06b8f4bd0bc188d01e0
Author: Liang-Chi Hsieh <[email protected]>
Date: 2016-02-24T06:56:03Z
Don't introduce redundant project with colum pruning rule.
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