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https://issues.apache.org/jira/browse/CALCITE-2469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16597227#comment-16597227
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Vladimir Sitnikov commented on CALCITE-2469:
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Hey, [~julianhyde], your "improvement for strong functions" introduces a bug.
Would you please mind to revert your improvement and/or fix the bug?
It would be so great if you could add at least a single test for the feature
you implement.
> 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 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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