GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/12122
[SPARK-14338][SQL] Improve `SimplifyConditionals` rule to handle `null` in
IF/CASEWHEN
## What changes were proposed in this pull request?
Currently, `SimplifyConditionals` handles `true` and `false` to optimize
branches. This issue improves `SimplifyConditionals` to take advantage of
`null` conditions for `if` and `CaseWhen` expressions, too.
## How was this patch tested?
Pass the Jenkins tests (including new extended test cases).
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dongjoon-hyun/spark SPARK-14338
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12122.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 #12122
----
commit 22bb31f7eb7217aa5f6d9541d56d18b9aaeb3735
Author: Dongjoon Hyun <[email protected]>
Date: 2016-04-01T23:49:06Z
[SPARK-14338][SQL] Improve `SimplifyConditionals` rule to handle `null` in
IF/CASEWHEN
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