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Posted to issues@calcite.apache.org by "Dan Zou (Jira)" <ji...@apache.org> on 2023/05/30 02:45:00 UTC

[jira] [Commented] (CALCITE-5425) Should not pushdown Filter through Aggregate without group keys

    [ https://issues.apache.org/jira/browse/CALCITE-5425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17727308#comment-17727308 ] 

Dan Zou commented on CALCITE-5425:
----------------------------------

[~julianhyde] Thanks, I have improved the summary and code according to your opinions, and I will pay attention to these issues in the future.

> Should not pushdown Filter through Aggregate without group keys
> ---------------------------------------------------------------
>
>                 Key: CALCITE-5425
>                 URL: https://issues.apache.org/jira/browse/CALCITE-5425
>             Project: Calcite
>          Issue Type: Bug
>          Components: core
>            Reporter: Steve Carlin
>            Assignee: Dan Zou
>            Priority: Major
>              Labels: pull-request-available
>
> If we are given a query 
> SELECT count(x) FROM tbl HAVING false;
> This query should produce an empty set.  
> We should not allow a filter to pass through this aggregate.  When the aggregate has no group by, there is always one implied group (for the whole dataset).  So if we apply the filter before the aggregate, the implied group will still be created.  This is not what we want, since the filter should produce an empty set.



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