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https://issues.apache.org/jira/browse/HIVE-326?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joydeep Sen Sarma resolved HIVE-326.
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Resolution: Duplicate
> [hive] groupby count distinct with nulls has some problems
> ----------------------------------------------------------
>
> Key: HIVE-326
> URL: https://issues.apache.org/jira/browse/HIVE-326
> Project: Hadoop Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: Namit Jain
>
> select a, count(distinct b) from T group by a;
> had some problems if b is null.
> I will construct the exact testcase and get back
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