[jira] [Commented] (LUCENE-4598) Facet aggregation should work per segment

["Shai Erera (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-4598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13526602#comment-13526602 ] 

Shai Erera commented on LUCENE-4598:
------------------------------------

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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