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From "Oleg Gnatovskiy (JIRA)" <>
Subject [jira] Commented: (SOLR-236) Field collapsing
Date Fri, 08 Feb 2008 00:15:09 GMT


Oleg Gnatovskiy commented on SOLR-236:

Hello everyone. I am planning to implement chain collapsing on a high traffic production environment,
so I'd like to use a stable version of Solr. It doesn't seem like you have a chain collapse
patch for Solr 1.2, so I tried the Solr 1.1 patch. It seems to work fine at collapsing, but
how do I get a countt for the documents other then the one being displayed?

As a result I see:
<lst name="collapse_counts">
    <int name="Restaurant">2414</int>
    <int name="Bar/Club">9</int>
    <int name="Directory & Services">37</int>

Does that mean that there are 2414 more Restaurants, 9 more Bars and 37 more Directory &
Services? If so, then that's great.

However when I collapse on some integer fields I get an empty list for collapse_counts. Do
counts only work for text fields?

Thanks in advance for any help you can provide!

> Field collapsing
> ----------------
>                 Key: SOLR-236
>                 URL:
>             Project: Solr
>          Issue Type: New Feature
>          Components: search
>    Affects Versions: 1.3
>            Reporter: Emmanuel Keller
>         Attachments: field-collapsing-extended-592129.patch, field_collapsing_1.1.0.patch,
field_collapsing_1.3.patch, field_collapsing_dsteigerwald.diff, field_collapsing_dsteigerwald.diff,
SOLR-236-FieldCollapsing.patch, SOLR-236-FieldCollapsing.patch, SOLR-236-FieldCollapsing.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."
> 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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