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

["Julian Hyde (JIRA)" <ji...@apache.org>]

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

Julian Hyde resolved CALCITE-3049.
----------------------------------
       Resolution: Fixed
    Fix Version/s: 1.20.0

Fixed in https://github.com/apache/calcite/commit/247c7d4f76a3d7d862ae6f4148cc8e6556efa497, a collaboration between me and [~danny0405].

> 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
>              Labels: pull-request-available
>             Fix For: 1.20.0
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> 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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