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https://issues.apache.org/jira/browse/LUCENE-4969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13645467#comment-13645467
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Michael McCandless commented on LUCENE-4969:
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+1
> add sort comparator that uses OrdinalMap
> ----------------------------------------
>
> Key: LUCENE-4969
> URL: https://issues.apache.org/jira/browse/LUCENE-4969
> Project: Lucene - Core
> Issue Type: New Feature
> Reporter: Robert Muir
>
> OrdinalMap (LUCENE-4795, SOLR-4490) lets you trade off reopen time for faster
> faceting: it maps per-segment ordinals to a "global" space based on deviation
> from expected deltas.
> We could add a sort comparator to the sandbox or similar that uses this,
> especially in the case you are using this for faceting anyway: you can then
> safely offload all terms bytes to disk (DiskDV) and still have performant
> sorting and faceting.
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