GitHub user bomeng opened a pull request:
https://github.com/apache/spark/pull/12373
[SPARK-14541] [SQL] [WIP] SQL function: IFNULL, NULLIF, NVL and NVL2
## What changes were proposed in this pull request?
I am trying to implement functions `NULLIF` in this PR. The meaning of
NULLIF can be found here:
[NULLIF(
)](https://oracle-base.com/articles/misc/null-related-functions#nullif)
## How was this patch tested?
Test cases were added.
## JIRA related
[SPAKR-14541](https://issues.apache.org/jira/browse/SPARK-14541)
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/bomeng/spark SPARK-14541
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12373.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 #12373
----
commit c479394e1a6aa1588544357a0aa76054cb813088
Author: bomeng <[email protected]>
Date: 2016-04-13T22:53:47Z
support of NULLIF()
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