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https://issues.apache.org/jira/browse/SOLR-236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13028248#comment-13028248
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Yuriy Akopov commented on SOLR-236:
-----------------------------------
Hi and sorry for breaking the silence.
So far the patch is working okay in our system, thanks again.
However I've noticed that the collapse.facet parameter set to 'after' doesn't
produce very precise figures. When results are collapsed, it may give, say, 366
results for the facet item while actually there are 396 returned by Solr after
collapsing.
The figures are never very different from the actual ones but they vary in some
narrow interval. I mean, for number of results up to 10000 they differ by <100
only. My collapsing-related part of the query is the following:
$search_options['qt'] = 'collapse';
$search_options['collapse.field'] = 'my_string_field'; // name of
the field to collapse on, in my case it is a string field
$search_options['collapse.type'] = 'normal'; // it is always
'normal' and never 'adjacent' in my case
$search_options['collapse.facet'] = 'after';
When collapsing is turned off, facet figures are calculated precisely, as
expected. Have anybody else experienced that, and if so, is there a solution
available? Thanks in advance.
> 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: DocSetScoreCollector.java,
> NonAdjacentDocumentCollapser.java, NonAdjacentDocumentCollapserTest.java,
> SOLR-236-1_4_1-NPEfix.patch, SOLR-236-1_4_1-paging-totals-working.patch,
> SOLR-236-1_4_1.patch, SOLR-236-FieldCollapsing.patch,
> SOLR-236-FieldCollapsing.patch, SOLR-236-FieldCollapsing.patch,
> SOLR-236-branch_3x.patch, SOLR-236-distinctFacet.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,
> 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.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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