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https://issues.apache.org/jira/browse/HIVE-8151?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Prasanth J updated HIVE-8151:
-----------------------------
    Release Note: Added config changes to 
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties

> Dynamic partition sort optimization inserts record wrongly to partition when 
> used with GroupBy
> ----------------------------------------------------------------------------------------------
>
>                 Key: HIVE-8151
>                 URL: https://issues.apache.org/jira/browse/HIVE-8151
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 0.14.0, 0.13.1
>            Reporter: Prasanth J
>            Assignee: Prasanth J
>            Priority: Blocker
>              Labels: TODOC14
>             Fix For: 0.14.0
>
>         Attachments: HIVE-8151.1.patch, HIVE-8151.10.patch, 
> HIVE-8151.2.patch, HIVE-8151.3.patch, HIVE-8151.4.patch, HIVE-8151.5.patch, 
> HIVE-8151.6.patch, HIVE-8151.7.patch, HIVE-8151.8.patch, HIVE-8151.9.patch
>
>
> HIVE-6455 added dynamic partition sort optimization. It added startGroup() 
> method to FileSink operator to look for changes in reduce key for creating 
> partition directories. This method however is not reliable as the key called 
> with startGroup() is different from the key called with processOp(). 
> startGroup() is called with newly changed key whereas processOp() is called 
> with previously aggregated key. This will result in processOp() writing the 
> last row of previous group as the first row of next group. This happens only 
> when used with group by operator.
> The fix is to not rely on startGroup() and do the partition directory 
> creation in processOp() itself.



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