GitHub user rxin opened a pull request:
https://github.com/apache/spark/pull/10827
[SPARK-12770][SQL] Implement rules for branch elimination for CaseWhen
The three optimization cases are:
1. If the first branch's condition is a true literal, remove the CaseWhen
and use the value from that branch.
2. If a branch's condition is a false or null literal, remove that branch.
3. If only the else branch is left, remove the CaseWhen and use the value
from the else branch.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/rxin/spark SPARK-12770
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/10827.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 #10827
----
commit 6c8201c4f884a16660088f3aa695a9b4f773c0d6
Author: Reynold Xin <[email protected]>
Date: 2016-01-19T07:05:03Z
[SPARK-12770][SQL] Implement rules for branch elimination for CaseWhen
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