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https://issues.apache.org/jira/browse/CALCITE-5366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17628454#comment-17628454
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Julian Hyde commented on CALCITE-5366:
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A test case for this would be useful. It might be useful to look through the
existing unit tests and see if there's something similar. I honestly thought
that I covered this case in CALCITE-941.
> User defined function optional named arguments are required to be present
> -------------------------------------------------------------------------
>
> Key: CALCITE-5366
> URL: https://issues.apache.org/jira/browse/CALCITE-5366
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.32.0
> Reporter: Tuomas Kiviaho
> Priority: Major
>
> In situation where optional parameters are stated before the required ones
> the {{FamilyOperandTypeChecker#getOperandCountRange}} prohibits leaving these
> arguments undefined.
> Would it be possible to have {{getOperandCountRange}} reporting only the
> number of non-optional parameters in case named parameters are used.
> The current behavior might indeed be in line with SQL99 SQL:1999 Part 2
> Section 10.4 as the {{SqlUtil#lookupSubjectRoutines}} states, but the current
> behavior kind of beats the flexibility that named parameters provide.
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