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https://issues.apache.org/jira/browse/SOLR-5020?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13762992#comment-13762992
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Joel Bernstein commented on SOLR-5020:
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Good catch. I'll open a new ticket for this and get a patch up this afternoon.
> Add finish() 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: 4.5, 5.0
>
> Attachments: SOLR-5020.patch
>
>
> This issue adds a finish() 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 finish() 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 finish()
> 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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