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https://issues.apache.org/jira/browse/CALCITE-2469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16596716#comment-16596716
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Vladimir Sitnikov commented on CALCITE-2469:
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Hey, [~julianhyde], I know you had concerts re this issue, however [~pzw2018]
has come up with an amazing PR; do you mind if I commit it?
> 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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