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https://issues.apache.org/jira/browse/CALCITE-7425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18062345#comment-18062345
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Zhen Wang commented on CALCITE-7425:
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> A bug without a test case isn't really a bug. Because it's rather subjective 
> what a method *should* do if it is never called.

If this method is never used and it has some ambiguity, should we throw an 
unsupported exception directly for the SqlBetweenOperator#not method?

> I see that {{RelBuilder.call()}} calls not() for LIKE and SIMILAR operators 
> but not for BETWEEN. Maybe there's an opportunity to make {{RelBuilder}} a 
> bit smarter.

SqlBetweenOperator is not a valid rex operator, so we may not be able to use it 
on toRel.

[https://github.com/apache/calcite/blob/7654dd82162508231cb3ed44e60fed356e931403/core/src/main/java/org/apache/calcite/sql/fun/SqlBetweenOperator.java#L114-L116]

> The logic of the `SqlBetweenOperator#not` method is incorrect.
> --------------------------------------------------------------
>
>                 Key: CALCITE-7425
>                 URL: https://issues.apache.org/jira/browse/CALCITE-7425
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 1.41.0
>            Reporter: Zhen Wang
>            Priority: Major
>              Labels: pull-request-available
>
> While reading the `SqlBetweenOperator` code, I found that the logic of the 
> `SqlBetweenOperator#not` method is incorrect.
>  



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