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https://issues.apache.org/jira/browse/LUCENE-4858?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13622758#comment-13622758
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Shai Erera commented on LUCENE-4858:
------------------------------------
Adrien and I chatted about it and we think that what's best to do as part of
this issue is:
* Make a concrete EarlyTerminatingSortedCollector (instead of the ones in the
patch), which takes a Sorter and numDocs. For every segment, it checks whether
the reader is sorted and collects up to numDocs from each sorted segment, or
all docs from unsorted segments.
** That's basically a combination of what EarlyTerminationCollector and
SortingMPCollector do in the current patch.
* Add isSorted(AtomicReader, Sorter) to SortingMP, as a utility method for
other early terminating collectors (Adrien has an idea about a few, but not as
part of this issue).
* Clarify documentation of this collector (e.g. what early termination really
means).
I'll work on patch in the next few days, maybe during the weekend.
> Early termination with SortingMergePolicy
> -----------------------------------------
>
> Key: LUCENE-4858
> URL: https://issues.apache.org/jira/browse/LUCENE-4858
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Fix For: 4.3
>
> Attachments: LUCENE-4858.patch, LUCENE-4858.patch, LUCENE-4858.patch
>
>
> Spin-off of LUCENE-4752, see
> https://issues.apache.org/jira/browse/LUCENE-4752?focusedCommentId=13606565&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13606565
> and
> https://issues.apache.org/jira/browse/LUCENE-4752?focusedCommentId=13607282&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13607282
> When an index is sorted per-segment, queries that sort according to the index
> sort order could be early terminated.
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