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https://issues.apache.org/jira/browse/LUCENE-1849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12747851#action_12747851
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Michael McCandless commented on LUCENE-1849:
--------------------------------------------

We do need to index your memory cells!

Except: that entry is showing the [sizable] perf gains of disabling scoring 
when sorting by field (I think?). We were instead looking for the comparison of 
BooleanScorer vs BoolenScorer2.

> Add OutOfOrderCollector and InOrderCollector subclasses of Collector
> --------------------------------------------------------------------
>
>                 Key: LUCENE-1849
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1849
>             Project: Lucene - Java
>          Issue Type: Wish
>          Components: Search
>    Affects Versions: 2.9
>            Reporter: Tim Smith
>            Priority: Minor
>             Fix For: 2.9
>
>
> I find myself always having to implement these methods, and i always return a 
> constant (depending on if the collector can handle out of order hits)
> would be nice for these two convenience abstract classes to exist that 
> implemented acceptsDocsOutOfOrder() as final and returned the appropriate 
> value

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