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https://issues.apache.org/jira/browse/CALCITE-2046?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16361279#comment-16361279
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Julian Hyde commented on CALCITE-2046:
--------------------------------------

Yes, at some point. I think that two cases are higher priority: (1) loading all 
functions from an external library (self-describing, so we don't need DDL for 
each individual function), (2) CREATE FUNCTION with SQL as the language (since 
it's SQL it can just be inlined into the query). But I wouldn't turn down a 
pull request for "CREATE FUNCTION ... AS LANGUAGE ..."! 

> Support "CREATE FUNCTION" DDL
> -----------------------------
>
>                 Key: CALCITE-2046
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2046
>             Project: Calcite
>          Issue Type: New Feature
>            Reporter: Shuyi Chen
>            Assignee: Shuyi Chen
>            Priority: Major
>
> We want to add DDL support for creating external function like Apache Drill 
> ([https://drill.apache.org/docs/create-function-using-jar/]). 
> {code:java}
> CREATE FUNCTION USING JAR '<jar_name>.jar';
> {code}



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