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https://issues.apache.org/jira/browse/CALCITE-5769?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17740365#comment-17740365
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xiong duan commented on CALCITE-5769:
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[~FatLittle] [~libenchao] Hi, The PR is ready for review If you have free time.
Thanks very much.
> Optimizing 'CAST(e AS t) IS NOT NULL' to 'e IS NOT NULL'
> --------------------------------------------------------
>
> Key: CALCITE-5769
> URL: https://issues.apache.org/jira/browse/CALCITE-5769
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.34.0
> Reporter: xiong duan
> Assignee: xiong duan
> Priority: Major
> Labels: pull-request-available
>
> According to CALCITE-5156. We should support optimize:
> * 'CAST(e AS t) IS NOT NULL' to 'e IS NOT NULL'
> * 'CAST(e AS t) IS NULL' to 'e IS NULL'
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