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From "Martijn van Groningen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-236) Field collapsing
Date Tue, 29 Jun 2010 06:56:49 GMT

    [ https://issues.apache.org/jira/browse/SOLR-236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12883435#action_12883435
] 

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 also 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 internally, 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= parameter, only querying one core.
I think that this part of the response is not copied from the shard's responses 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 committed. Child issues
of SOLR-236 like SOLR-1682 on the other hand will get committed 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. Just to make some things clear, because this is a long, very long and
complicated 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-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, DocSetScoreCollector.java,
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, NonAdjacentDocumentCollapser.java,
NonAdjacentDocumentCollapserTest.java, quasidistributed.additional.patch, SOLR-236-1_4_1.patch,
SOLR-236-FieldCollapsing.patch, SOLR-236-FieldCollapsing.patch, SOLR-236-FieldCollapsing.patch,
SOLR-236-trunk.patch, SOLR-236-trunk.patch, SOLR-236-trunk.patch, SOLR-236-trunk.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 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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