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https://issues.apache.org/jira/browse/SOLR-10292?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15929953#comment-15929953
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Dennis Gove commented on SOLR-10292:
------------------------------------

I like this. Also, a new set of evaluator types which return arrays/lists.

> Add cartesian Streaming Expression to build cartesian products from 
> multi-value fields and text fields
> ------------------------------------------------------------------------------------------------------
>
>                 Key: SOLR-10292
>                 URL: https://issues.apache.org/jira/browse/SOLR-10292
>             Project: Solr
>          Issue Type: New Feature
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Joel Bernstein
>
> Currently all the Streaming Expression such as rollups, intersections, fetch 
> etc, work on single value fields. The *cartesian* expression would create a 
> stream of tuples from a single tuple with a multi-value field. This would 
> allow multi-valued fields to be operated on by the wider library of Streaming 
> Expression.
> For example a single tuple with a multi-valued field:
> id: 1
> author: [Jim, Jack, Steve]
> Would be transformed in the following three tuples:
> id:1
> author:Jim
> id:1
> author:Jack
> id:1
> author:Steve



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