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https://issues.apache.org/jira/browse/CALCITE-2469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16583072#comment-16583072
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Julian Hyde commented on CALCITE-2469:
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Maybe I'm confused about the precedence of NOT and IS NULL. Maybe we all are.
Can you clarify: are we talking about "(not (x)) is null" or "not (x is null)"?
> RexSimplify should not optimize 'not(x) is null' to 'x is not 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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