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https://issues.apache.org/jira/browse/CALCITE-2644?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16666688#comment-16666688
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Julian Hyde commented on CALCITE-2644:
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Wasn't this fixed in CALCITE-2438?
> isAlwaysTrue broken for IS FALSE
> --------------------------------
>
> Key: CALCITE-2644
> URL: https://issues.apache.org/jira/browse/CALCITE-2644
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.17.0
> Reporter: Michael Mior
> Assignee: Michael Mior
> Priority: Major
>
> This came up in the fuzz test added by [~vlsi]. In RexCall#isAlwaysTrue, the
> return value for IS FALSE is the result of checking isAlwaysTrue for the
> operand. Similarly, the behaviour seems to also be correct for IS NOT FALSE
> and IS NOT TRUE. Could someone take a quick look and tell me if I'm missing
> something?
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