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Date: Tue, 29 Jun 2010 02:56:49 -0400 (EDT)
From: "Martijn van Groningen (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Subject: [jira] Commented: (SOLR-236) Field collapsing
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    [ https://issues.apache.org/jira/browse/SOLR-236?page=3Dcom.atlassian.j=
ira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D128834=
35#action_12883435 ]=20

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

bq. Seconded. The NPE's were occurring rather randomly, but I haven't seen =
them since I've switched to 1.4.1 + your latest patch. Good stuff! It's als=
o nice to have a patch against an actual release version (FYI, I was using =
r955615 before as per your patch note).
A lot of stuff is changing (or already has changed) in Lucene / Solr intern=
ally, so that might have been the cause of these exceptions.

bq. So the actual field requested (content) doesn't get added. It does work=
 when I remove the shards=3D parameter, only querying one core.
I think that this part of the response is not copied from the shard's respo=
nses into the response that is returned to the client. So that 'll have to =
be added in order to get these collapsed documents

One important notice about this patch is that it is not going to be committ=
ed. Child issues of SOLR-236 like SOLR-1682 on the other hand will get comm=
itted to the trunk, but it might take some time till all the functionality =
that patches of SOLR-236 provide are implemented in a efficient manner. Jus=
t to make some things clear, because this is a long, very long and complica=
ted issue.

> 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: Next
>
>         Attachments: collapsing-patch-to-1.3.0-dieter.patch, collapsing-p=
atch-to-1.3.0-ivan.patch, collapsing-patch-to-1.3.0-ivan_2.patch, collapsin=
g-patch-to-1.3.0-ivan_3.patch, DocSetScoreCollector.java, field-collapse-3.=
patch, field-collapse-4-with-solrj.patch, field-collapse-5.patch, field-col=
lapse-5.patch, field-collapse-5.patch, field-collapse-5.patch, field-collap=
se-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.p=
atch, field-collapse-5.patch, field-collapse-5.patch, field-collapse-5.patc=
h, 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, Non=
AdjacentDocumentCollapser.java, NonAdjacentDocumentCollapserTest.java, quas=
idistributed.additional.patch, SOLR-236-1_4_1.patch, SOLR-236-FieldCollapsi=
ng.patch, SOLR-236-FieldCollapsing.patch, SOLR-236-FieldCollapsing.patch, S=
OLR-236-trunk.patch, SOLR-236-trunk.patch, SOLR-236-trunk.patch, SOLR-236-t=
runk.patch, SOLR-236-trunk.patch, SOLR-236.patch, SOLR-236.patch, SOLR-236.=
patch, SOLR-236.patch, SOLR-236.patch, SOLR-236.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 gi=
ven 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 docum=
ents from this site" link. See also Duplicate detection."
> http://www.fastsearch.com/glossary.aspx?m=3D48&amid=3D299
> 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 c=
ollapsing
> 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 ;-)

--=20
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