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https://issues.apache.org/jira/browse/SOLR-16243?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17552787#comment-17552787
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Joel Bernstein commented on SOLR-16243:
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The latest commit to the PR is getting closer to passing tests. Looks like the
select * ... queries are broken in this branch still though. I'll figure what
the issue is.
> Compile SQL to a Streaming Expression while visiting the Calcite SQL parse
> tree
> -------------------------------------------------------------------------------
>
> Key: SOLR-16243
> URL: https://issues.apache.org/jira/browse/SOLR-16243
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Parallel SQL
> Reporter: Joel Bernstein
> Assignee: Joel Bernstein
> Priority: Major
> Labels: RobustSQL
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Currently Solr SQL visits the SQL parse tree and builds up a set of
> properties that are passed to the SolrTable which creates the Streaming
> Expression object tree. This technique only works because we're not dealing
> yet with joins. It won't be practical to express joins using the current
> approach. In order to support joins we'll need to build the Streaming
> Expression as we visit the parse tree and pass the expression directly to the
> SolrTable.
> This ticket will only implement existing SQL support using the direct
> compilation approach.
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