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Posted to issues@calcite.apache.org by "Steve Carlin (Jira)" <ji...@apache.org> on 2022/12/08 19:59:00 UTC

[jira] [Created] (CALCITE-5425) Should not pushdown filter through aggregate with an empty groupset

Steve Carlin created CALCITE-5425:
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             Summary: Should not pushdown filter through aggregate with an empty groupset
                 Key: CALCITE-5425
                 URL: https://issues.apache.org/jira/browse/CALCITE-5425
             Project: Calcite
          Issue Type: Bug
          Components: core
            Reporter: Steve Carlin


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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