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https://issues.apache.org/jira/browse/CALCITE-2469?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde resolved CALCITE-2469.
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Resolution: Fixed
Fix Version/s: 1.18.0
I've fixed the issue for strong functions with multiple arguments in
[86993bde|http://git-wip-us.apache.org/repos/asf/calcite/commit/86993bde].
> RexSimplify should optimize '(NOT x) IS NULL' to 'x IS NULL'
> ------------------------------------------------------------
>
> Key: CALCITE-2469
> URL: https://issues.apache.org/jira/browse/CALCITE-2469
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.17.0
> Reporter: pengzhiwei
> Assignee: Julian Hyde
> Priority: Critical
> Fix For: 1.18.0
>
>
> The RexSimplify currently optimizes '(not x) is null' to 'x is not null'.
> However, this is incorrect. It is same to the case '(not x) is not null'.
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