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https://issues.apache.org/jira/browse/CALCITE-5963?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17759651#comment-17759651
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Julian Hyde commented on CALCITE-5963:
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Yes, this is a duplicate of CALCITE-4189. Let's discuss there.
> Simplify 'x OR NOT(x)' to TRUE
> ------------------------------
>
> Key: CALCITE-5963
> URL: https://issues.apache.org/jira/browse/CALCITE-5963
> Project: Calcite
> Issue Type: New Feature
> Reporter: hongyu guo
> Assignee: hongyu guo
> Priority: Major
>
> When unknownAs is TRUE, or type of x is not nullable, Calcite can simpify:
> x OR NOT( x ) ==> TRUE
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