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https://issues.apache.org/jira/browse/LUCENE-4598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13526704#comment-13526704
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Shai Erera commented on LUCENE-4598:
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not necessarily :). These are not either-or IMO. We've spent a lot of time
addressing different faceting scenarios in this module. There are plenty of
extension points ranging from simple configuration to writing your own facets
collection algorithm.
This issue is quite simple - you propose to fix a specific class to not use
MultiFields. Let's do it, even before LUCENE-4600. Since it's a low hanging
fruit, and I'm not sure that we'll never need to do a post-collection
aggregation, so this class will probably be needed still.
> 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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