GitHub user davies opened a pull request:
https://github.com/apache/spark/pull/11256
[SPARK-13376] [SQL] improve column pruning
## What changes were proposed in this pull request?
This PR mostly rewrite the ColumnPruning rule to support most of the SQL
logical plans (except those for Dataset).
## How was the this patch tested?
This is test by unit tests, also manually test with TPCDS Q78, which could
prune all unused columns successfully, improved the performance by 78% (from
22s to 12s).
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/davies/spark fix_column_pruning
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11256.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 #11256
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commit 1145f1975481fc5dadc0efe876a7b746ce26cdc1
Author: Davies Liu <[email protected]>
Date: 2016-02-18T23:00:35Z
improve column pruning
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