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https://issues.apache.org/jira/browse/CALCITE-5798?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17739492#comment-17739492
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xiong duan commented on CALCITE-5798:
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[~Runking] Hi, I prefer
|'(1 < x) IS NOT TRUE' when x is not nullable should be simplified to '1 >= x'|
And this summary is complete. The '(x < y) IS TRUE' is just another test case，
covered by test is enough.
> Improve simplification of '(x < y) IS NOT TRUE' and '(x < y) IS TRUE' when x
> and y are not nullable
> ---------------------------------------------------------------------------------------------------
>
> Key: CALCITE-5798
> URL: https://issues.apache.org/jira/browse/CALCITE-5798
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.34.0
> Reporter: Runkang He
> Assignee: Runkang He
> Priority: Major
> Labels: pull-request-available
>
> Currently '(1 < x) IS NOT TRUE' when pulled up predicates contain 'x IS NOT
> NULL' is not simplified, and keeps it as it is.
>
> It can and should be simplified to '1 >= x', which is more concise and useful
> for further simplification, such as CALCITE-5780
>
> Note that this Jira is splited from CALCITE-5780, which makes this part of
> codes more clear, and follows the principle that a Jira only discusses one
> issue.
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