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https://issues.apache.org/jira/browse/LUCENE-4598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13528911#comment-13528911
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Shai Erera commented on LUCENE-4598:
------------------------------------

nice !

I expect a higher gain when indexing multiple facets per document, since the 
payload will be bigger. I think that not copying the payload would show a 
bigger gain than in this benchmark.
                
> Change PayloadIterator to not use top-level reader API
> ------------------------------------------------------
>
>                 Key: LUCENE-4598
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4598
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: modules/facet
>            Reporter: Michael McCandless
>            Assignee: Shai Erera
>             Fix For: 4.1, 5.0
>
>         Attachments: LUCENE-4598.patch, LUCENE-4598.patch, 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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