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https://issues.apache.org/jira/browse/LUCENE-3918?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13591725#comment-13591725
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Shai Erera commented on LUCENE-3918:
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Well, in theory, one could do the following:
* Let segments be flushed unsorted
* During merge, open an AtomicReader which detects that it's an unsorted
segment and build the old2New[], reading the documents in the right order
* Provide his own SegmentMerger which doesn't append seg2 after seg1, but
rather does a true "merge" of the two, by comparing the sort-by-value of each
document
But that's all in theory, none of the API exist today. Also, even if you did
that, your index would still be unsorted, because a sorted segment says nothing
about the total sort order of the index...
> 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-3918.patch, LUCENE-3918.patch,
> LUCENE-3918.patch, LUCENE-3918.patch, LUCENE-3918.patch, 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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