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https://issues.apache.org/jira/browse/SOLR-10292?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15930824#comment-15930824
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Dennis Gove commented on SOLR-10292:
------------------------------------
My concern with relying on sort() is that it requires reading all tuples before
doing the sort. If we're just providing a way to order the generated tuples I
think using a sort() stream would be too costly.
I agree that the result of each evaluator will be based on the original tuple.
But if multiple evaluators, e1 and e2, are used then the resulting tuples will
look like
{code}
{
fieldA : e1[0],
fieldB : e2[0],
<other fields>
},
{
fieldA : e1[0],
fieldB : e2[1],
<other fields>
},
{
fieldA : e1[0],
fieldB : e2[2],
<other fields>
},
{
fieldA : e1[1],
fieldB : e2[0],
<other fields>
},
{
fieldA : e1[1],
fieldB : e2[1],
<other fields>
},
{
fieldA : e1[1],
fieldB : e2[2],
<other fields>
},
{code}
> 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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