Kevin Risden commented on SOLR-8593:

The merge looks like it went well. Tests haven't failed from what I've seen. 
Thanks Joel!

> Integrate Apache Calcite into the SQLHandler
> --------------------------------------------
>                 Key: SOLR-8593
>                 URL: https://issues.apache.org/jira/browse/SOLR-8593
>             Project: Solr
>          Issue Type: Improvement
>          Components: Parallel SQL
>            Reporter: Joel Bernstein
>            Assignee: Joel Bernstein
>             Fix For: 6.5, master (7.0)
>         Attachments: SOLR-8593.patch, 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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