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