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https://issues.apache.org/jira/browse/LUCENE-4598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13526602#comment-13526602
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Shai Erera commented on LUCENE-4598:
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Is this really an issue? I thought that pulling a top-level D&PEnum on a single
posting won't gain much by iterating per segment? The per-segment iteration is
more complicated (code-wise) ...
Anyway, I think that either in this issue or another one, we should explore a
Collector that aggregates the ordinals during collection, and not after
collection has finished. That will save substantial RAM consumed by the bitset
(not critical) and potential float[] (for scores), which is the size of the
result set.
> 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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