GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/5979
[SPARK-2155][SQL] add CaseKeyWhen for "CASE a WHEN b THEN c [WHEN d THEN
e]* [ELSE f] END"
Avoid translating to CaseWhen and evaluate the key expression many times.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark condition
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/5979.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 #5979
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commit 3ce54e11f884e42371b10906e1586f182fe77be1
Author: Wenchen Fan <[email protected]>
Date: 2015-05-07T12:43:31Z
add CaseKeyWhen
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