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https://issues.apache.org/jira/browse/CALCITE-2567?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16620545#comment-16620545
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Vladimir Sitnikov commented on CALCITE-2567:
--------------------------------------------
Fixed in
https://git-wip-us.apache.org/repos/asf?p=calcite.git;a=commit;h=1420e4da8240d44a6a0f80b42d37a9e6fd836af7
> Simplify IS NULL(null) to true
> ------------------------------
>
> 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
> Fix For: 1.18.0
>
>
> 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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