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https://issues.apache.org/jira/browse/LUCENE-1421?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless updated LUCENE-1421:
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Attachment: LUCENE-1421.patch
Initial rough patch. I think it's working well. I reused the test
case from the original patch (thank you Martijn!), and also created a
new random test case. There are still nocommits/sops/javadocs to
clean up... but I think it's close.
We cannot yet cutover Solr to this module because it doesn't support
grouping by ValueSource (from a function query) nor by arbitrary
query. (This refactoring groups by a single-valued indexed field.) I
think we need to first refactor function queries (LUCENE-2883) and
also filter caches out of Solr before cutting Solr over.
I plan to backport this to 3.x as contrib/grouping.
> 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
> Priority: Minor
> Fix For: 3.2, 4.0
>
> Attachments: 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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