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Posted to issues@calcite.apache.org by "Danny Chan (JIRA)" <ji...@apache.org> on 2019/05/05 01:44:00 UTC

[jira] [Assigned] (CALCITE-3049) When simplifying expressions, revisit "IS NULL" if its argument has been simplified

     [ https://issues.apache.org/jira/browse/CALCITE-3049?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Danny Chan reassigned CALCITE-3049:
-----------------------------------

    Assignee: Danny Chan

> When simplifying expressions, revisit "IS NULL" if its argument has been simplified
> -----------------------------------------------------------------------------------
>
>                 Key: CALCITE-3049
>                 URL: https://issues.apache.org/jira/browse/CALCITE-3049
>             Project: Calcite
>          Issue Type: Bug
>          Components: core
>            Reporter: Julian Hyde
>            Assignee: Danny Chan
>            Priority: Major
>
> When simplifying expressions, revisit "IS NULL" if its argument has been simplified. For example, we currently simplify {code}(CASE WHEN FALSE THEN +(v0) ELSE -1 END) IS UNKNOWN{code} to {code}-1 IS UNKNOWN{code} but we should further simplify that to {{FALSE}}.
> I have a preliminary [dev branch|https://github.com/julianhyde/calcite/tree/3049-simplify-is-null], but it needs a little more debugging. I'd be grateful if someone could finish it.



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