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https://issues.apache.org/jira/browse/LUCENE-4600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13526630#comment-13526630
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Shai Erera commented on LUCENE-4600:
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Just one comment, sampling benefits from this two pass, because that way we can
guarantee a minimum sample set size. Maybe there's way to achieve that with
in-collection aggregation too, but noting it here so that it's in our minds.
See my comment on LUCENE-4598, the bitset may not be that small :).
> Facets should aggregate during collection, not at the end
> ---------------------------------------------------------
>
> Key: LUCENE-4600
> URL: https://issues.apache.org/jira/browse/LUCENE-4600
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
>
> Today the facet module simply gathers all hits (as a bitset, optionally with
> a float[] to hold scores as well, if you will aggregate them) during
> collection, and then at the end when you call getFacetsResults(), it makes a
> 2nd pass over all those hits doing the actual aggregation.
> We should investigate just aggregating as we collect instead, so we don't
> have to tie up transient RAM (fairly small for the bit set but possibly big
> for the float[]).
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