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From "Martijn van Groningen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-236) Field collapsing
Date Thu, 17 Dec 2009 15:57:18 GMT

    [ https://issues.apache.org/jira/browse/SOLR-236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12791986#action_12791986
] 

Martijn van Groningen commented on SOLR-236:
--------------------------------------------

Shalin.
1. This configuration also looks fine by me. The reason I added <fieldCollapsing> ...
</fieldCollapsing> was to be able support sharing of collapseCollectorFactory instances
between different collapse components in the near future. You think that is a valid reason
for that? Or do you think that collapseCollectorFactories shouldn't be shared? 
2. I forgot to create that, so a good thing you added it.
3. I think leaving out those changes will make the distributed integration tests fail (Haven't
checked it).

Noble. 
1. The reason I gave a name to collaspeCollectorFactory was for using an instance twice for
different collapse components. 
2. Moving the classname to the class attribute looks better, then in the function element.
So I think we should change that.

Grant. 
1. I think you also referring to sharding. Sharding is supported, but not in a very elegant
way. You will need to partition your documents to your shards in such a way that all documents
belonging to a collapse group appear on one shard. To be honest I have never tested the patch
on a corpus of 100M docs.
2. Field collapsing can impact the search time in a very negative way. I wrote a small paragraph
about it on my [blog|http://blog.jteam.nl/2009/10/20/result-grouping-field-collapsing-with-solr/].
3. The first two response examples are for 'old' patches. The last response example is for
the more recent patches (and current patch). 

> Field collapsing
> ----------------
>
>                 Key: SOLR-236
>                 URL: https://issues.apache.org/jira/browse/SOLR-236
>             Project: Solr
>          Issue Type: New Feature
>          Components: search
>    Affects Versions: 1.3
>            Reporter: Emmanuel Keller
>            Assignee: Shalin Shekhar Mangar
>             Fix For: 1.5
>
>         Attachments: collapsing-patch-to-1.3.0-dieter.patch, collapsing-patch-to-1.3.0-ivan.patch,
collapsing-patch-to-1.3.0-ivan_2.patch, collapsing-patch-to-1.3.0-ivan_3.patch, field-collapse-3.patch,
field-collapse-4-with-solrj.patch, field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patch,
field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patch,
field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patch,
field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patch,
field-collapse-solr-236-2.patch, field-collapse-solr-236.patch, field-collapsing-extended-592129.patch,
field_collapsing_1.1.0.patch, field_collapsing_1.3.patch, field_collapsing_dsteigerwald.diff,
field_collapsing_dsteigerwald.diff, field_collapsing_dsteigerwald.diff, quasidistributed.additional.patch,
SOLR-236-FieldCollapsing.patch, SOLR-236-FieldCollapsing.patch, SOLR-236-FieldCollapsing.patch,
SOLR-236.patch, solr-236.patch, SOLR-236_collapsing.patch, SOLR-236_collapsing.patch
>
>
> This patch include a new feature called "Field collapsing".
> "Used in order to collapse a group of results with similar value for a given field to
a single entry in the result set. Site collapsing is a special case of this, where all results
for a given web site is collapsed into one or two entries in the result set, typically with
an associated "more documents from this site" link. See also Duplicate detection."
> http://www.fastsearch.com/glossary.aspx?m=48&amid=299
> The implementation add 3 new query parameters (SolrParams):
> "collapse.field" to choose the field used to group results
> "collapse.type" normal (default value) or adjacent
> "collapse.max" to select how many continuous results are allowed before collapsing
> TODO (in progress):
> - More documentation (on source code)
> - Test cases
> Two patches:
> - "field_collapsing.patch" for current development version
> - "field_collapsing_1.1.0.patch" for Solr-1.1.0
> P.S.: Feedback and misspelling correction are welcome ;-)

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