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https://issues.apache.org/jira/browse/SOLR-8593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15890431#comment-15890431
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Joel Bernstein commented on SOLR-8593:
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The backport is turning out be trickier then I thought.
The reason is that jira/solr-8593 has lost of master commits in it that are not
in branch_6x. So merging is not going to work.
Also getting an isolated list of the 80+ commits done in jira/solr-8593 for the
Calcite integration is tricky because the original pull request is closed.
Creating a new pull request against branch_6x includes all the master commits.
So I'm looking at ways to isolate all the commits to cherry-pick.
> 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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