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https://issues.apache.org/jira/browse/SOLR-16238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17547339#comment-17547339
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Joel Bernstein commented on SOLR-16238:
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There are some serious mysteries need to be unraveled in order to document this
code. One of big mysteries is how rules actually fire.
Then solrImplementer is instantiated and empty here:
https://github.com/apache/solr/blob/03efd00a4fe2b5f946cf539c3ef831ff55d4f07b/solr/modules/sql/src/java/org/apache/solr/handler/sql/SolrToEnumerableConverter.java#L57
By the time it reaches this line it's populated by rules that have fired:
https://github.com/apache/solr/blob/03efd00a4fe2b5f946cf539c3ef831ff55d4f07b/solr/modules/sql/src/java/org/apache/solr/handler/sql/SolrToEnumerableConverter.java#L70
So somewhere between line 57 and 70 the rules have fired. The most likely place
where the rules fire is:
https://github.com/apache/solr/blob/03efd00a4fe2b5f946cf539c3ef831ff55d4f07b/solr/modules/sql/src/java/org/apache/solr/handler/sql/SolrToEnumerableConverter.java#L58
Some debugging in the code will confirm this.
> 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
>
> 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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