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https://issues.apache.org/jira/browse/SOLR-8593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15378665#comment-15378665
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Joel Bernstein commented on SOLR-8593:
--------------------------------------
The CoGroup operator is interesting. Solr's Streaming Expressions provide some
similar operations
(https://cwiki.apache.org/confluence/display/solr/Streaming+Expressions).
CoGroup seems similar to a rollup() function wrapped around a join in Streaming
Exrpressions. Psuedo-code:
{code}
rollup(sum(x),
over="y",
innerJoin(on="a=b",
search(...),
search(...)))
{code)
Our basic strategy is to build up a Streaming Expressions that implements
Calcites relational algebra. We've done this already with the Presto parser,
but without joins.
Looking forward to diving deeper into Calcite.
> Integrate Apache Calcite into the SQLHandler
> --------------------------------------------
>
> Key: SOLR-8593
> URL: https://issues.apache.org/jira/browse/SOLR-8593
> Project: Solr
> Issue Type: Improvement
> Reporter: Joel Bernstein
>
> 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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