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https://issues.apache.org/jira/browse/LUCENE-5476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13937580#comment-13937580
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Gilad Barkai commented on LUCENE-5476:
--------------------------------------
About the scores (the only part I got to review thus far), the scores should be
a non-sparse float array.
E,g, if there are 1M documents and the original set contains 1000 documents the
score[] array would be of length 1000, If the sampled set will only have 10
documents, the score[] array should be only 10.
The relevant part:
{code}
if (getKeepScores()) {
scores[doc] = docs.scores[doc];
}
{code}
should be changed as the scores[] size and index should be relative to the
sampled set and not the original results.
Also the size of the score[] array could be the amount of bins?
> Facet sampling
> --------------
>
> Key: LUCENE-5476
> URL: https://issues.apache.org/jira/browse/LUCENE-5476
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Rob Audenaerde
> Attachments: LUCENE-5476.patch, LUCENE-5476.patch, LUCENE-5476.patch,
> LUCENE-5476.patch, LUCENE-5476.patch, LUCENE-5476.patch, LUCENE-5476.patch,
> LUCENE-5476.patch, LUCENE-5476.patch,
> SamplingComparison_SamplingFacetsCollector.java, SamplingFacetsCollector.java
>
>
> With LUCENE-5339 facet sampling disappeared.
> When trying to display facet counts on large datasets (>10M documents)
> counting facets is rather expensive, as all the hits are collected and
> processed.
> Sampling greatly reduced this and thus provided a nice speedup. Could it be
> brought back?
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