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https://issues.apache.org/jira/browse/LUCENE-1421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13032082#comment-13032082
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Martijn van Groningen commented on LUCENE-1421:
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Nice work Michael! I also think that the two pass mechanism is definitely the
preferred way to go.
I think we also need a strategy mechanism (or at least an GroupCollector class
hierarchy) inside this module. The mechanism should select the right group
collector(s) for a certain request. Some users maybe only care about the top
group document, so I second pass won't be necessary. Another example with
faceting in mind. When group based faceting is necessary. The top N groups
don't suffice. You'll need all group docs (I currently don't see a other way).
These groups docs are then used to create a grouped Solr DocSet. But this
should be a completely different implementation.
> 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-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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