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https://issues.apache.org/jira/browse/HIVE-18105?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zoltan Haindrich updated HIVE-18105:
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Attachment: HIVE-18105.02.patch
> 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, HIVE-18105.02.patch
>
>
> the groupbyoperator's logic for firstrow passes {{null}} for all parameters.
> see
> [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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