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https://issues.apache.org/jira/browse/SOLR-2072?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13176323#comment-13176323
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George P. Stathis commented on SOLR-2072:
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My progress so far has been in terms of climbing the learning curve. I had to
do some reading on the Lucene basics first (Lucene in Action is a great book
BTW). I came to the same conclusion as Martijn which is to create a specialized
implementation of an AbstractFirstPassGroupingCollector subclass. I had to
pause my efforts to address some other internal sprint work but I should be
tackling this again this week. My first goal is to hack a collector that can
sort by the sum of the document scores in group and learn from it for the more
generalized cases.
> 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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