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https://issues.apache.org/jira/browse/HADOOP-4367?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zheng Shao resolved HADOOP-4367.
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Resolution: Fixed
> Hive: UDAF functions cannot handle NULL values
> ----------------------------------------------
>
> Key: HADOOP-4367
> URL: https://issues.apache.org/jira/browse/HADOOP-4367
> Project: Hadoop Core
> Issue Type: Bug
> Components: contrib/hive
> Reporter: Zheng Shao
> Assignee: Zheng Shao
>
> The UDAF functions cannot handle null values. It just throws a
> NullPointerException. We should properly handle null values in UDAF.
> For all UDAF functions that we have now: sum, count, ave, we should ignore
> the null values.
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