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https://issues.apache.org/jira/browse/CALCITE-2567?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

pengzhiwei updated CALCITE-2567:
--------------------------------
    Description: 
The "is null(null)" should simplify to "true",but RexSimplify#simplifyIsNull 
does not work for it.

A PR have made to solve this issue at [PR 
835|[https://github.com/apache/calcite/pull/835]]

  was:
The "is null(null)" should simplify to "true",but RexSimplify#simplifyIsNull 
does not work for it.

A PR have made to solve this issue at [PR 
835|[https://github.com/apache/calcite/pull/835]|https://github.com/apache/calcite/pull/835].Any]


> RexSimplify#simplifyIsNull does not work for "is null(null)"
> ------------------------------------------------------------
>
>                 Key: CALCITE-2567
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2567
>             Project: Calcite
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 1.17.0
>            Reporter: pengzhiwei
>            Assignee: Julian Hyde
>            Priority: Major
>
> The "is null(null)" should simplify to "true",but RexSimplify#simplifyIsNull 
> does not work for it.
> A PR have made to solve this issue at [PR 
> 835|[https://github.com/apache/calcite/pull/835]]



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