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https://issues.apache.org/jira/browse/CALCITE-1383?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15514421#comment-15514421
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James Taylor commented on CALCITE-1383:
---------------------------------------

Thanks makes sense, [~julianhyde]. I'll close this JIRA and open a specific one 
to add freemarker templates to parser for {{ALTER SYSTEM ...}} calls. Would you 
be able to point us toward a commit that added some of these templates in the 
past?

> Allow extensions to existing Calcite parser rules
> -------------------------------------------------
>
>                 Key: CALCITE-1383
>                 URL: https://issues.apache.org/jira/browse/CALCITE-1383
>             Project: Calcite
>          Issue Type: Improvement
>            Reporter: James Taylor
>            Assignee: Julian Hyde
>
> In Phoenix, we'd like to add some Phoenix-specific commands in support of our 
> UDF implementation. For example, we'd like to add commands like to manage the 
> jars containing the implementation of the UDFs:
> - {{ALTER SYSTEM ADD JAR ...}}
> - {{ALTER SYSTEM LIST JARS}}
> Without copy/pasting the entire parser grammar for the command (see comment 
> here[1]), it seems there's no easy way to do it. Perhaps we're missing 
> something and there's already an easy way?
> [1] 
> https://issues.apache.org/jira/browse/PHOENIX-3242?focusedCommentId=15512529&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15512529



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