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https://issues.apache.org/jira/browse/CALCITE-2326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16642308#comment-16642308
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Julian Hyde commented on CALCITE-2326:
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I used the {{simplifyUnknownAs}} because the {{simplify(RexNode,
RexUnknownAs)}} is used for the "internal" simplify method (which does not
perform verification) and because, though public, we expect that it will rarely
be used.
> 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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