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https://issues.apache.org/jira/browse/LUCENE-4598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13527408#comment-13527408
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Shai Erera commented on LUCENE-4598:
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bq. I noticed that CategoryListIterator (and PayloadIterator) define an init()
method which must be called prior to using them
Maybe it's not useless after all. That way, impls can do some checks at init(),
and not repeat them in skipTo. So for now I think that I'll just leave it.
> 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
> Attachments: LUCENE-4598.patch
>
>
> 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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