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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 updated CALCITE-2469:
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Summary: RexSimplify should optimize '(NOT x) IS NULL' to 'x IS NULL'
(was: RexSimplify should not optimize '(not x) is null' to 'x is not null')
> 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
>
> The RexSimplify will optimize the '(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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