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https://issues.apache.org/jira/browse/LUCENE-1421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13032350#comment-13032350
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Martijn van Groningen commented on LUCENE-1421:
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bq. But what if docid=2 had age=17 instead? How would we determine what value
the group (for hgid=1) should have for the "age" field?
That would depend on the group sort, right? If your group sort is age asc the
lowest document would be chosen.
bq. Or... would the group count +1 to age=10 and +1 to age=17 in that case?
You mean like a sum of all ages per group? That is interesting, but sounds more
like a function to me. This can be computed with a separated group collector.
Wouldn't make sense to me, to have this with a regular field facet.
> Ability to group search results by field
> ----------------------------------------
>
> Key: LUCENE-1421
> URL: https://issues.apache.org/jira/browse/LUCENE-1421
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Search
> Reporter: Artyom Sokolov
> Assignee: Michael McCandless
> Priority: Minor
> Fix For: 3.2, 4.0
>
> Attachments: LUCENE-1421.patch, LUCENE-1421.patch,
> lucene-grouping.patch
>
>
> It would be awesome to group search results by specified field. Some
> functionality was provided for Apache Solr but I think it should be done in
> Core Lucene. There could be some useful information like total hits about
> collapsed data like total count and so on.
> Thanks,
> Artyom
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