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https://issues.apache.org/jira/browse/SOLR-18195?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18074476#comment-18074476
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ASF subversion and git services commented on SOLR-18195:
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Commit ef75ab82a5a8ee56a64e2bc70302904fcf86c8dd in solr's branch
refs/heads/main from Sonu Sharma
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=ef75ab82a5a ]
SOLR-18195: CombinedQueryComponent supports Collapse now (#4277)
Support for using {!collapse} with CombinedQueryComponent (RRF)
> Support for Collapse Results in Combined Query Component
> --------------------------------------------------------
>
> Key: SOLR-18195
> URL: https://issues.apache.org/jira/browse/SOLR-18195
> Project: Solr
> Issue Type: Improvement
> Components: vector-search
> Reporter: Sonu Sharma
> Priority: Minor
> Labels: pull-request-available
> Time Spent: 2.5h
> Remaining Estimate: 0h
>
> With reference to previous new Query Component Feature:
> https://issues.apache.org/jira/browse/SOLR-17319
> When using \{!collapse} with CombinedQueryComponent (hybrid search / RRF),
> duplicate documents appear in the result set for the same collapse field
> value. Each sub-query independently collapses correctly via
> CollapsingPostFilter, but simpleCombine() merges results by Lucene doc ID
> only - it has no awareness of the collapse field. Different sub-queries may
> select different group heads for the same field value, and both survive the
> merge.
> However it is well know limitation that :[ "In order to use these features
> with SolrCloud, the documents must be located on the same
> shard."|https://solr.apache.org/guide/solr/latest/query-guide/collapse-and-expand-results.html]
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