Kensho Hirasawa created SOLR-10528:
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Summary: Use docvalue for range faceting in JSON facet API
Key: SOLR-10528
URL: https://issues.apache.org/jira/browse/SOLR-10528
Project: Solr
Issue Type: Improvement
Components: Facet Module
Affects Versions: 6.5
Reporter: Kensho Hirasawa
Priority: Minor
Range faceting in JSON facet API has only one implementation. In the
implementation, all buckets are allocated and then range queries are executed
for all the buckets. Therefore, memory usage and computational cost of range
facet can be very high if range is wide and gap is narrow.
I think range faceting in JSON facet should have the implementation which uses
DocValues instead of inverted indices. By scanning DocValues, we can execute
range facets much more efficiently especially when the number of buckets is
large.
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