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https://issues.apache.org/jira/browse/SOLR-8593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15378775#comment-15378775
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Joel Bernstein edited comment on SOLR-8593 at 7/15/16 2:53 AM:
---------------------------------------------------------------
Ah, I see. I think we can pull off CoGroup with a merge() and reduce().
{code}
reduce(merge(search(..., sort="a asc"),
search(..., sort="a asc"),
on="a asc")),
by="a",
group(sort="b asc", n="5"))
{code}
This operation is more generic in that it could be an aggregation or a join
depending on what comes after the reduce.
Fun stuff.
was (Author: joel.bernstein):
Ah, I see. I think we can pull off CoGroup with a merge() and reduce().
{code}
reduce(merge(search(..., sort="a asc"),
search(..., sort="a asc"),
on="a asc")),
by="a",
group(sort="b asc", n="5"))
{code}
This operation is more generic in that it could be an aggregation or a join
depending what comes after the reduce.
Fun stuff.
> 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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