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https://issues.apache.org/jira/browse/CALCITE-6409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17846120#comment-17846120
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Caican Cai commented on CALCITE-6409:
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[~mbudiu] Thank you. I thought this was a general concept, so I developed an
issue specifically. Sorry.
Then there is only one last question left, whether I should adapt to spark's
nvl2 (expr, Boolean, CHAR) situation
> Char types and Boolean types are comparable
> -------------------------------------------
>
> Key: CALCITE-6409
> URL: https://issues.apache.org/jira/browse/CALCITE-6409
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.37.0
> Reporter: Caican Cai
> Priority: Critical
> Fix For: 1.38.0
>
>
> In the SameOperandTypeChecker method, the char type and the boolean type are
> comparable because of the call to the isComparable method.
> Comparability of char types and boolean types returns true in the
> isComparable method.
> However, char types and Boolean types in Spark are incomparable. Does Calcite
> have fixed standards here?
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