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https://issues.apache.org/jira/browse/LUCENE-3918?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13563813#comment-13563813
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Michael McCandless commented on LUCENE-3918:
--------------------------------------------

bq. From what I remember (and I looked at the code again now), the 3.6 impl 
read the posting into a RAMOutputStream:

OK but that approach is quite memory efficient (the postings are stored 
compressed in RAM) ... vs creating java objects per-doc and per-position (as 
SortingD&PEnum does in the patch).

                
> Port index sorter to trunk APIs
> -------------------------------
>
>                 Key: LUCENE-3918
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3918
>             Project: Lucene - Core
>          Issue Type: Task
>          Components: modules/other
>    Affects Versions: 4.0-ALPHA
>            Reporter: Robert Muir
>             Fix For: 4.2, 5.0
>
>         Attachments: LUCENE-3918.patch
>
>
> LUCENE-2482 added an IndexSorter to 3.x, but we need to port this
> functionality to 4.0 apis.

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