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https://issues.apache.org/jira/browse/CALCITE-7619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18090907#comment-18090907
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Yu Xu commented on CALCITE-7619:
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In my opinion, simplifyIs1 directly prevents IS_FALSE(x) → NOT x from occurring
when x is nullable. This is the least modified and most localized solution,
ensuring that simplifyPreservingType does not result in an expression that
requires forced CAST.
> RexSimplify incorrectly simplifies IS_FALSE(x) when x is nullable
> -----------------------------------------------------------------
>
> Key: CALCITE-7619
> URL: https://issues.apache.org/jira/browse/CALCITE-7619
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.42.0
> Reporter: Mihai Budiu
> Priority: Minor
> Fix For: 1.43.0
>
>
> The expression is reduced to CAST(NOT(x) AS BOOLEAN NOT NULL). This is wrong
> when x is NULL.
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