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