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https://issues.apache.org/jira/browse/SOLR-5020?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yonik Seeley resolved SOLR-5020.
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Resolution: Fixed
Fix Version/s: 4.4
Although I'm still questioning "configurable collectors", this issue certainly
makes sense on it's own.
Committed 4x & trunk.
> Add final() method to DelegatingCollector
> -----------------------------------------
>
> Key: SOLR-5020
> URL: https://issues.apache.org/jira/browse/SOLR-5020
> Project: Solr
> Issue Type: New Feature
> Components: search
> Affects Versions: 5.0
> Reporter: Joel Bernstein
> Priority: Minor
> Fix For: 5.0, 4.4
>
> Attachments: SOLR-5020.patch
>
>
> This issue adds a final() method to the DelegatingCollector class so that it
> can be notified when collection is complete.
> The current collect() method assumes that the delegating collector will
> either forward on the document or not with each call. The final() method will
> allow DelegatingCollectors to have more sophisticated behavior.
> For example a Field Collapsing delegating collector could collapse the
> documents as the collect() method is being called. Then when the final()
> method is called it could pass the collapsed documents to the delegate
> collectors.
> This would allow grouping to be implemented within the PostFilter framework.
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