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https://issues.apache.org/jira/browse/HIVE-2532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13427197#comment-13427197
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Jonathan Chang commented on HIVE-2532:
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It's ok by me if you want to return a bool instead. That being said, things
should not crash if things are NULL (I think this was a recent regression and
there's a JIRA open for it).
> Evaluation of non-deterministic/stateful UDFs should not be skipped even if
> constant oi is returned.
> ----------------------------------------------------------------------------------------------------
>
> Key: HIVE-2532
> URL: https://issues.apache.org/jira/browse/HIVE-2532
> Project: Hive
> Issue Type: Bug
> Reporter: Jonathan Chang
> Assignee: Jonathan Chang
> Fix For: 0.8.0
>
> Attachments: D273.1.patch, D273.2.patch, D273.3.patch, D273.4.patch,
> D273.4.patch, D273.4.patch
>
>
> Even if constant oi is returned, these may have stateful/side-effect behavior
> and hence need to be called each cycle.
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