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https://issues.apache.org/jira/browse/SOLR-8593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15844115#comment-15844115
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Kevin Risden commented on SOLR-8593:
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There is one test that I need to look at testDriverMetadata that depends on the 
order of schemas returned. I haven't checked precommit yet but I can run that.

> Integrate Apache Calcite into the SQLHandler
> --------------------------------------------
>
>                 Key: SOLR-8593
>                 URL: https://issues.apache.org/jira/browse/SOLR-8593
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Joel Bernstein
>            Assignee: Joel Bernstein
>         Attachments: SOLR-8593.patch, SOLR-8593.patch
>
>
>    The Presto SQL Parser was perfect for phase one of the SQLHandler. It was 
> nicely split off from the larger Presto project and it did everything that 
> was needed for the initial implementation.
> Phase two of the SQL work though will require an optimizer. Here is where 
> Apache Calcite comes into play. It has a battle tested cost based optimizer 
> and has been integrated into Apache Drill and Hive.
> This work can begin in trunk following the 6.0 release. The final query plans 
> will continue to be translated to Streaming API objects (TupleStreams), so 
> continued work on the JDBC driver should plug in nicely with the Calcite work.



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