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https://issues.apache.org/jira/browse/CALCITE-2326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16642174#comment-16642174
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Vladimir Sitnikov commented on CALCITE-2326:
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[~julianhyde],
{quote} Vladimir Sitnikov: Please make sure that error message makes it clear
WHAT was the test case without looking at the source code.{quote}
Please make checkSimplify3 print understandable error messages or provide a
reasoning why it cannot be done.
It is not clear why you miss that change.
> Generalize p(x) IS TRUE/FALSE/UNKNOWN handling in RexSimplify
> -------------------------------------------------------------
>
> Key: CALCITE-2326
> URL: https://issues.apache.org/jira/browse/CALCITE-2326
> Project: Calcite
> Issue Type: Improvement
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
>
> Currently only IS TRUE is handle by the unknownAsFalse field variable.
> The main goal would be to extend the logic to also handle IS FALSE cases (and
> possibly IS UNKNOWN too)
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