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From "Michael McCandless (JIRA)" <>
Subject [jira] [Updated] (LUCENE-1421) Ability to group search results by field
Date Tue, 10 May 2011 17:33:47 GMT


Michael McCandless updated LUCENE-1421:

    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:
>             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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