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https://issues.apache.org/jira/browse/LUCENE-4598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13526674#comment-13526674
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Michael McCandless commented on LUCENE-4598:
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bq. Though, if we move to only during-collection aggregation, I don't think
that this issue will still be valid.
Ahh good point. So we should do the other issue first :)
> Facet aggregation should work per segment
> -----------------------------------------
>
> Key: LUCENE-4598
> URL: https://issues.apache.org/jira/browse/LUCENE-4598
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/facet
> Reporter: Michael McCandless
>
> Currently the facet module uses MultiFields.* to pull the D&PEnum in
> PayloadIterator, to access the payloads that store the facet ords.
> It then makes heavy use of .advance and .getPayload to visit all docIDs in
> the result set.
> I think we should get some speedup if we go segment by segment instead ...
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