GitHub user ueshin opened a pull request:
https://github.com/apache/spark/pull/1428
[SPARK-2509][SQL] Add optimization for Substring.
`Substring` including `null` literal cases could be added to
`NullPropagation`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ueshin/apache-spark issues/SPARK-2509
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/1428.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 #1428
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commit d9eb85f902c5498f9b7b6c6035471f622dd7d629
Author: Takuya UESHIN <ues...@happy-camper.st>
Date: 2014-07-16T03:31:45Z
Add Substring cases to NullPropagation.
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