David Smiley created SOLR-15899:
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Summary: Use new Weight.count optimization
Key: SOLR-15899
URL: https://issues.apache.org/jira/browse/SOLR-15899
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Components: search
Reporter: David Smiley
Lucene LUCENE-9620 added a Weight.count API. Solr's DocSet based queries
(presently, Filter) can implement the count. It's primarily used by
IndexSearcher.count. GraphQueryWeight could implement this too.
FYI SolrIndexSearcher.numDocs is related to IndexSearcher.count in purpose but
the overloads declare that filter cache entries will be created/used, and so
it's probably not appropriate to change them, as they should continue to cache
by side-effect. However, the overload taking (Query a, DocSet b) checks for a
lack of a filterCache and it counts in a more manual way. It could be updated
to use count(q).
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