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From "Shalin Shekhar Mangar (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-236) Field collapsing
Date Tue, 22 Dec 2009 13:02:29 GMT

    [ https://issues.apache.org/jira/browse/SOLR-236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12793607#action_12793607
] 

Shalin Shekhar Mangar commented on SOLR-236:
--------------------------------------------

{quote}
This is exactly the point, it's not really meta-data over the document, but on the group the
document belongs to. And you also need a more obvious way to mark this document as a group
representation (to distinguish it from other normal documents).
{quote}

We show the highest scoring document of a group, so does the fact that the metadata belongs
to the group and not the document matter at all?

{quote}
But extending the current <doc> element, doesn't mean we break BWC. Adding a <collapse-info>
(or <collapse-meta-data>) sub element to it, will certainly not break anything, specially
when we still don't have a formal xsd for the responses (I know we're working on it, but it's
still not out there so it's safe).
{quote}

We are not extending anything. We're just adding a couple of fields which may not exist in
the index and this is a capability we plan to introduce anyway (however this issue does not
need to depend on SOLR-1566). The response format remains exactly the same. There is no break
in compatibility.

> 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.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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