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Posted to issues@calcite.apache.org by "Chunwei Lei (Jira)" <ji...@apache.org> on 2020/04/01 09:45:00 UTC

[jira] [Assigned] (CALCITE-3890) Infer IS NOT NULL predicate from join

     [ https://issues.apache.org/jira/browse/CALCITE-3890?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chunwei Lei reassigned CALCITE-3890:
------------------------------------

    Assignee: Chunwei Lei

> Infer IS NOT NULL predicate from join
> -------------------------------------
>
>                 Key: CALCITE-3890
>                 URL: https://issues.apache.org/jira/browse/CALCITE-3890
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>            Reporter: Chunwei Lei
>            Assignee: Chunwei Lei
>            Priority: Major
>
> We can infer IS NOT NULL predicate from join which implies some columns may not be null. For instance, 
>  
> {code:java}
> select * from a join b on a.id = b.id;
> {code}
> we can infer a.id is not null and b.id is not null.



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