David Smiley created SOLR-10727:
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Summary: Optimize faceting on empty docSet to return faster and
not pollute filter cache
Key: SOLR-10727
URL: https://issues.apache.org/jira/browse/SOLR-10727
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Reporter: David Smiley
Assignee: David Smiley
Priority: Minor
Fix For: master (7.0)
In certain faceting circumstances (both classic SimpleFacets and JSON Facets),
{{SolrIndexSearcher.numDocs(q,docSet)}} is invoked. numDocs can be improved to
return early if the passed docSet (the base of documents to compute facets on)
is empty. Since it doesn't today, it'll go create a filter cache entry (if it
doesn't exist) for the query. Range faceting is a heavy user of this method
since it'll be called for each range. If you're doing date range faceting and
do time based sharding and have a time based filter query, then there's a
decent chance the current index in question won't match the query. So lets not
pollute the filter cache.
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