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https://issues.apache.org/jira/browse/SOLR-4654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16187509#comment-16187509
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Erick Erickson commented on SOLR-4654:
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[~cpoerschke] Can we close this or are there still parts undone?
> Integrate Lucene's sorting and early query termination capabilities into Solr
> -----------------------------------------------------------------------------
>
> Key: SOLR-4654
> URL: https://issues.apache.org/jira/browse/SOLR-4654
> Project: Solr
> Issue Type: Improvement
> Reporter: Adrien Grand
> Priority: Trivial
> Labels: gsoc2014
>
> I think there would be some interesting work to do to integrate Lucene's
> sorting and early query termination capabilities into Solr, in particular
> (just ideas, maybe they're not all interesting/useful):
> - configuring a SortingMergePolicy,
> - figuring out when the sort order of queries matches the sort order of the
> index segments,
> - giving the ability to get approximated results when the query is not
> sorted but only boosted by the sort order of the index,
> - integration with TimeLimitingCollector: maybe it's better to collect only
> half of all segments than to fully collect half of the segments,
> - approximation of the number of matches based on the ratio of collected
> documents,
> - ...
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