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From "Martijn van Groningen (JIRA)" <>
Subject [jira] [Updated] (SOLR-2524) Adding grouping to Solr 3x
Date Wed, 18 May 2011 16:56:47 GMT


Martijn van Groningen updated SOLR-2524:

    Attachment: SOLR-2524.patch

Attached the initial patch.

* Patch is based on what is in the trunk. 
** Integrated the grouping contrib collectors
** Same response formats.
** All parameters except group.query and group.func are supported.
** Computed DocSet (for facetComponent and StatsComponent) is based the ungrouped result.
* Also integrated the caching collector. For this I added the group.cache=true|false and group.cache.maxSize=[number]

Things still todo:
* Integrate AllGroupsCollector for total count based on groups.
* Create a Solr Test for grouping
* Cleanup / Refactor / java doc

> Adding grouping to Solr 3x
> --------------------------
>                 Key: SOLR-2524
>                 URL:
>             Project: Solr
>          Issue Type: New Feature
>    Affects Versions: 3.2
>            Reporter: Martijn van Groningen
>         Attachments: SOLR-2524.patch
> Grouping was recently added to Lucene 3x. See LUCENE-1421 for more information.
> I think it would be nice if we expose this functionality also to the Solr users that
are bound to a 3.x version.
> The grouping feature added to Lucene is currently a subset of the functionality that
Solr 4.0-trunk offers. Mainly it doesn't support grouping by function / query.
> The work involved getting the grouping contrib to work on Solr 3x is acceptable. I have
it more or less running here. It supports the response format and request parameters (expect:
group.query and group.func) described in the FieldCollapse page on the Solr wiki.
> I think it would be great if this is included in the Solr 3.2 release. Many people are
using grouping as patch now and this would help them a lot. Any thoughts?

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