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https://issues.apache.org/jira/browse/SOLR-16857?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joel Bernstein updated SOLR-16857:
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    Description: 
E-commerce catalogs often use collapse to collapse product records within a 
group. For example a particular couch might come in different colors or 
fabrics. So a single couch might have a large number of slightly different 
records within the group.

When reranking a collapsed query with a vector query the vector query will 
select the top K matches based on the vector. The top K could include multiple 
records from within the same product group although only one group head was 
selected from the group. This will pollute the top K results with lots 
duplicate records of no value.

The solution is to devise a filter that limits the vector query to searching on 
the selected group heads from the collapse.

> Efficiently rerank collapsed queries with vector queries
> --------------------------------------------------------
>
>                 Key: SOLR-16857
>                 URL: https://issues.apache.org/jira/browse/SOLR-16857
>             Project: Solr
>          Issue Type: New Feature
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Joel Bernstein
>            Priority: Major
>
> E-commerce catalogs often use collapse to collapse product records within a 
> group. For example a particular couch might come in different colors or 
> fabrics. So a single couch might have a large number of slightly different 
> records within the group.
> When reranking a collapsed query with a vector query the vector query will 
> select the top K matches based on the vector. The top K could include 
> multiple records from within the same product group although only one group 
> head was selected from the group. This will pollute the top K results with 
> lots duplicate records of no value.
> The solution is to devise a filter that limits the vector query to searching 
> on the selected group heads from the collapse.



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