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https://issues.apache.org/jira/browse/SOLR-16235?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joel Bernstein reassigned SOLR-16235:
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Assignee: Joel Bernstein
> Allow Solr SQL to use the drill Streaming Expression for high cardinality
> aggregations
> --------------------------------------------------------------------------------------
>
> Key: SOLR-16235
> URL: https://issues.apache.org/jira/browse/SOLR-16235
> 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
>
> The latest versions of Streaming Expressions support the drill function which
> is designed for high cardinality aggregations
> (https://solr.apache.org/guide/8_6/stream-source-reference.html#drill). Drill
> allows users to push down a Streaming Expression into the export handler
> itself and emit aggregated tuples over the wire. Because drill still takes
> advantage of the sort order of the export handler it supports unlimited
> cardinality.
> This improvement should be rather easy to implement but there are some
> questions about the design. One thought I had was to add a new mode called
> *drill* to the existing *map_reduce* and *facet* modes. This would preserve
> the existing map_reduce execution plan. The other approach is simply to
> always use drill in *map_reduce* mode aggregations.
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