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https://issues.apache.org/jira/browse/SOLR-2072?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13164384#comment-13164384
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Erick Erickson commented on SOLR-2072:
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George:
This isn't going to be all that much help, but you might try stepping through
the test cases to get a feel for how grouping works, see: TestGroupingSearch
for instance. And the files referenced in some of the patches might also be
useful, e.g. SOLR-2072.
Warning: I know very little to nothing about the code in question, but that's
how I'd start to get a feel for it, hopefully enough to propose an approach...
> Search Grouping: expand group sort options
> ------------------------------------------
>
> Key: SOLR-2072
> URL: https://issues.apache.org/jira/browse/SOLR-2072
> Project: Solr
> Issue Type: Sub-task
> Reporter: Yonik Seeley
>
> Ability to specify functions over group documents when sorting groups.
> max(score) or avg(popularity), etc.
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