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From "Michael McCandless (JIRA)" <>
Subject [jira] [Commented] (SOLR-2524) Adding grouping to Solr 3x
Date Wed, 18 May 2011 18:00:48 GMT


Michael McCandless commented on SOLR-2524:

Awesome, that was fast!

Maybe rename group.cache.maxSize -> .maxSizeMB?  (So it's clear what the units are).

Should we default group.cache to true?  (It's false now?).

When you get the top groups from collector2, should you pass in offset instead of 0?  (Hmm
-- maybe groupOffset?  It seems like you're using offset for both the first & second phase
collectors?  Maybe I'm confused...).

bq. Computed DocSet (for facetComponent and StatsComponent) is based the ungrouped result.

This matches how Solr does grouping on trunk right?

> 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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