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https://issues.apache.org/jira/browse/HIVE-13555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15469691#comment-15469691
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Lefty Leverenz commented on HIVE-13555:
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Doc note: The nullif UDF should be documented in the wiki for release 2.2.0.
* [Hive Operators and UDFs -- Conditional Functions |
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF#LanguageManualUDF-ConditionalFunctions]
Added a TODOC2.2 label.
> Add nullif udf
> --------------
>
> Key: HIVE-13555
> URL: https://issues.apache.org/jira/browse/HIVE-13555
> Project: Hive
> Issue Type: Sub-task
> Components: UDF
> Reporter: Ashutosh Chauhan
> Assignee: Zoltan Haindrich
> Labels: TODOC2.2
> Fix For: 2.2.0
>
> Attachments: HIVE-13555.1.patch, HIVE-13555.2.patch,
> HIVE-13555.2.patch
>
>
> {{nullif(exp1, exp2)}} is shorthand for: {{case when exp1 = exp2 then null
> else exp1}}
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