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Posted to issues@hive.apache.org by "Jesus Camacho Rodriguez (JIRA)" <ji...@apache.org> on 2019/03/12 23:27:00 UTC
[jira] [Commented] (HIVE-21434) Extend
HiveAggregatePullUpConstantsRule to remove all grouping columns if possible
[ https://issues.apache.org/jira/browse/HIVE-21434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16791091#comment-16791091 ]
Jesus Camacho Rodriguez commented on HIVE-21434:
------------------------------------------------
Initial patch to trigger ptest.
> 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
> Attachments: HIVE-21434.patch
>
>
> 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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