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From "Rob Audenaerde (JIRA)" <>
Subject [jira] [Commented] (LUCENE-5476) Facet sampling
Date Tue, 04 Mar 2014 09:04:21 GMT


Rob Audenaerde commented on LUCENE-5476:


My use case is that I would like to present a 'overview' of the search results using facets.
Because the index might well be over 10M documents, I need the speed-up that comes from sampling
the facets.  The results do not need to be exact; as the user will be informed that the results
are estimated. 

I do want to provide a 'order of magnitude' comparison, that is why I need the {{correctCountFacetResults}}.
It is easier for the user to see that it is about 10.000 than just provide a percentage. 

> Facet sampling
> --------------
>                 Key: LUCENE-5476
>                 URL:
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Rob Audenaerde
>         Attachments: LUCENE-5476.patch, LUCENE-5476.patch, LUCENE-5476.patch,,
> 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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