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https://issues.apache.org/jira/browse/CALCITE-947?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16818269#comment-16818269
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Julian Hyde commented on CALCITE-947:
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No one is working on it. Feel free to assign it to yourself.
Do you plan to allow expressions or just literals?
> Allow optional parameters to have default values other than NULL
> ----------------------------------------------------------------
>
> Key: CALCITE-947
> URL: https://issues.apache.org/jira/browse/CALCITE-947
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Priority: Major
>
> As of CALCITE-941 user-defined functions can have optional parameters and you
> can omit them or use the DEFAULT keyword. But the default value must be NULL,
> and therefore the parameter must have an optional type.
> This case would remove that restriction and allow default values which are
> literals, or calls to system functions (e.g. USER) or references to other
> parameters, or expressions composed thereof.
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