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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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Julian Hyde resolved CALCITE-3049.
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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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