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Posted to issues@calcite.apache.org by "Rui Wang (Jira)" <ji...@apache.org> on 2020/02/02 04:59:00 UTC

[jira] [Assigned] (CALCITE-3764) AggregateCaseToFilterRule handles NULL values correctly

     [ https://issues.apache.org/jira/browse/CALCITE-3764?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rui Wang reassigned CALCITE-3764:
---------------------------------

    Assignee: Rui Wang

> AggregateCaseToFilterRule handles NULL values correctly
> -------------------------------------------------------
>
>                 Key: CALCITE-3764
>                 URL: https://issues.apache.org/jira/browse/CALCITE-3764
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: Julian Hyde
>            Assignee: Rui Wang
>            Priority: Major
>
> {{AggregateCaseToFilterRule}} handles NULL values correctly. It converts
> {code:sql}
> SELECT COUNT(CASE WHEN b THEN NULL ELSE 1 END) FROM t
> {code}
> to
> {code:sql}
> SELECT COUNT(*) FILTER (WHERE b IS FALSE) FROM t
> {code}
> which fails to count rows where {{b}} is UNKNOWN, so it should convert to
> {code:sql}
> SELECT COUNT(*) FILTER (WHERE b IS NOT TRUE) FROM t
> {code}



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