Shai Erera created LUCENE-5298:
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Summary: Allow aggregating facets by any ValueSource
Key: LUCENE-5298
URL: https://issues.apache.org/jira/browse/LUCENE-5298
Project: Lucene - Core
Issue Type: New Feature
Components: modules/facet
Reporter: Shai Erera
Facets can be aggregated today by counting them, aggregating by summing their
association values, or summing the scores of the documents. Applications can
write their own FacetsAggregator to compute the value of the facet in other
ways. Following the new expressions module, I think it will be interesting to
allow aggregating facets by arbitrary expressions, e.g. {{_score *
sqrt(price)}} where 'price' is an NDV field. I'd like to explore allowing any
ValueSource to be passed in and write a ValueSourceFacetsAggregator.
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