[jira] [Updated] (HIVE-18105) Aggregation of an empty set doesn't pass constants to the UDAF

["Zoltan Haindrich (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-18105?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zoltan Haindrich updated HIVE-18105:
------------------------------------
    Attachment: HIVE-18105.01.patch

#1)

* write test for groupbyoperator
* fix issue

> Aggregation of an empty set doesn't pass constants to the UDAF
> --------------------------------------------------------------
>
>                 Key: HIVE-18105
>                 URL: https://issues.apache.org/jira/browse/HIVE-18105
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Zoltan Haindrich
>            Assignee: Zoltan Haindrich
>         Attachments: HIVE-18105.01.patch
>
>
> the groupbyoperator's logic for firstrow passes {{null}} for all parameters.
> see here:
>  {here|https://github.com/apache/hive/blob/39d46e8af5a3794f7395060b890f94ddc84516e7/ql/src/java/org/apache/hadoop/hive/ql/exec/GroupByOperator.java#L1116}
> this could obstruct {{compute_stats}} operations because it has a constant argument.



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