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https://issues.apache.org/jira/browse/CALCITE-7748?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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krooswu resolved CALCITE-7748.
------------------------------
Resolution: Fixed
> CONCAT (and other STRING_SAME_SAME-typed operators) gives misleading error
> message for mixed CHARACTER/BINARY arguments
> -----------------------------------------------------------------------------------------------------------------------
>
> Key: CALCITE-7748
> URL: https://issues.apache.org/jira/browse/CALCITE-7748
> Project: Calcite
> Issue Type: Bug
> Affects Versions: 1.42.0
> Reporter: krooswu
> Assignee: krooswu
> Priority: Minor
> Fix For: 1.43.0
>
>
> {{SqlTypeFamily.STRING}} is an aggregate family that covers both
> {{CHARACTER}} and {{{}BINARY{}}}. Operators like {{CONCAT}} use
> {{{}OperandTypes.STRING_SAME_SAME{}}}, which is defined as:
>
> java
> {{STRING_SAME_SAME = STRING_STRING.and(SAME_SAME);}}
> {{STRING_STRING}} checks each operand independently against the aggregate
> {{STRING}} family, so a {{CHAR}} argument and a {{BINARY}} argument each pass
> on their own. The actual constraint that rejects mixed CHARACTER/BINARY calls
> comes from the second, AND-composed rule, {{{}SAME_SAME{}}}, which requires
> the operands to be mutually comparable (i.e. share the same _concrete_
> family).
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