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https://issues.apache.org/jira/browse/SOLR-16238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17551091#comment-17551091
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Kevin Risden commented on SOLR-16238:
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one thing that might help is looking at
https://github.com/risdenk/solr-calcite-example
its old and out of date compared to what is in the Apache Solr tree - but its a
standalone example of using Calcite w/ Solr. I originally developed the SQL
stuff there and then migrated it into the Solr tree.
I think its much simpler to understand since it is JUST the calcite code - no
Solr code to mess w/ at the same time.
When I started I literally only had the Solr tablescan basically and worked to
add from there. I don't know what has been added lately to the SQL code (I
haven't followed as closely as I want to)
> Code level documentation for Solr SQL
> -------------------------------------
>
> Key: SOLR-16238
> URL: https://issues.apache.org/jira/browse/SOLR-16238
> Project: Solr
> Issue Type: Task
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Parallel SQL
> Reporter: Joel Bernstein
> Assignee: Joel Bernstein
> Priority: Major
> Labels: RobustSQL
>
> The Solr SQL module is an Apache Calcite adaptor. I find the Apache Calcite
> framework quite confusing. So, for my own knowledge and for future devs who
> want to contribute to Solr SQL, I'd like to take the time to document the
> code thoroughly.
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