[jira] [Updated] (LUCENE-6066) Collector that manages diversity in search results

["Mark Harwood (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-6066?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mark Harwood updated LUCENE-6066:
---------------------------------
    Attachment: LUCENE-PQRemoveV8.patch

Tabs removed. Ant precommit now passes. Still no Bee Gees (sorry, Mike).
Will commit to trunk and 5.1 in a day or 2 if no objections. 

> Collector that manages diversity in search results
> --------------------------------------------------
>
>                 Key: LUCENE-6066
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6066
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/query/scoring
>            Reporter: Mark Harwood
>            Priority: Minor
>             Fix For: 5.0
>
>         Attachments: LUCENE-PQRemoveV8.patch
>
>
> This issue provides a new collector for situations where a client doesn't want more than N matches for any given key (e.g. no more than 5 products from any one retailer in a marketplace). In these circumstances a document that was previously thought of as competitive during collection has to be removed from the final PQ and replaced with another doc (eg a retailer who already has 5 matches in the PQ receives a 6th match which is better than his previous ones). This requires a new remove method on the existing PriorityQueue class.



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