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https://issues.apache.org/jira/browse/SOLR-10292?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15930428#comment-15930428
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Joel Bernstein commented on SOLR-10292:
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For the read() implementation I think each cartesian evaluator's product should
be based on the original tuple, not on the tuples created by the proceeding
cartesian evaluators. Otherwise the final product will be hard to understand.
> 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
> Attachments: SOLR-10292.patch
>
>
> 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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