[jira] [Created] (SOLR-10727) Optimize faceting on empty docSet to return faster and not pollute filter cache

["David Smiley (JIRA)" <ji...@apache.org>]

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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