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https://issues.apache.org/jira/browse/CALCITE-1444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15583715#comment-15583715
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Julian Hyde commented on CALCITE-1444:
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I think it's OK. When we unparse it has to produce a valid query, and a query 
that has the same effect, but it doesn't have to be same query.

> Add support for CONVERT scalar function
> ---------------------------------------
>
>                 Key: CALCITE-1444
>                 URL: https://issues.apache.org/jira/browse/CALCITE-1444
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>            Reporter: Laurent Goujon
>            Assignee: Julian Hyde
>
> Both ODBC and JDBC spec mention a {{CONVERT}} scalar function, which is the 
> equivalent of the {{CAST}} function.
> In order for JDBC and ODBC drivers to expose support for this function, 
> calcite should support parsing it, and converting it into a {{CAST}} 
> expression (currently, it doesn't unlike some other scalar functions).



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