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https://issues.apache.org/jira/browse/LUCENE-4600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13557581#comment-13557581
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Michael McCandless commented on LUCENE-4600:
--------------------------------------------
It's faster!
{noformat}
Task QPS base StdDev QPS comp StdDev
Pct diff
PKLookup 239.75 (1.2%) 237.59 (1.0%)
-0.9% ( -3% - 1%)
HighTerm 21.21 (1.5%) 29.80 (2.6%)
40.5% ( 35% - 45%)
MedTerm 34.90 (1.9%) 50.24 (1.9%)
44.0% ( 39% - 48%)
LowTerm 99.85 (3.7%) 152.40 (1.1%)
52.6% ( 46% - 59%)
{noformat}
> Explore facets aggregation during documents collection
> ------------------------------------------------------
>
> Key: LUCENE-4600
> URL: https://issues.apache.org/jira/browse/LUCENE-4600
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/facet
> Reporter: Michael McCandless
> Attachments: LUCENE-4600-cli.patch, LUCENE-4600.patch,
> LUCENE-4600.patch, LUCENE-4600.patch, LUCENE-4600.patch
>
>
> 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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