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https://issues.apache.org/jira/browse/SOLR-1298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12733631#action_12733631
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Chris Male commented on SOLR-1298:
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In my patch in SOLR-773, I tackled this issue by creating the idea of a 
FieldValueSource, which mapped a name of a pseudo-field to an arbitrary source 
of data which could be computed at runtime.  For me it was distances, but it 
could also be the results of a FunctionQuery.  Since there was a mapping of 
name to data, it was possible to include or exclude the FieldValueSources from 
adding their information to the search results through the fl parameter.

> FunctionQuery results as pseudo-fields
> --------------------------------------
>
>                 Key: SOLR-1298
>                 URL: https://issues.apache.org/jira/browse/SOLR-1298
>             Project: Solr
>          Issue Type: New Feature
>            Reporter: Grant Ingersoll
>            Priority: Minor
>             Fix For: 1.5
>
>
> It would be helpful if the results of FunctionQueries could be added as 
> fields to a document. 
> Couple of options here:
> 1. Run FunctionQuery as part of relevance score and add that piece to the 
> document
> 2. Run the function (not really a query) during Document/Field retrieval

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