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https://issues.apache.org/jira/browse/HIVE-21434?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HIVE-21434 started by Jesus Camacho Rodriguez.
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> Extend HiveAggregatePullUpConstantsRule to remove all grouping columns if
> possible
> ----------------------------------------------------------------------------------
>
> Key: HIVE-21434
> URL: https://issues.apache.org/jira/browse/HIVE-21434
> Project: Hive
> Issue Type: Improvement
> Components: CBO
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Priority: Major
>
> Currently there is a limitation in the rule implementation.
> {code}
> ...
> // No room for optimization since we cannot convert from non-empty
> // GROUP BY list to the empty one.
> ...
> {code}
> The rule extension should try to overcome the limitation by implementing this
> specific case calculating count(*) on Aggregate and applying Filter on top of
> it.
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