[jira] [Created] (LUCENE-10206) Implement O(1) count on query cache

["Nik Everett (Jira)" <ji...@apache.org>]

Nik Everett created LUCENE-10206:
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             Summary: Implement O(1) count on query cache
                 Key: LUCENE-10206
                 URL: https://issues.apache.org/jira/browse/LUCENE-10206
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Nik Everett


I'd like to implement the `Weight#count` method in `LRUQueryCache` so cached queries can quickly return their counts. We already have a count on all of the bit sets we use for the query cache we just have to store it and "plug it in".

 

I got here because we frequently end up wanting to get counts and I saw hot `RoaringDocIdSet`'s iterator hot spotting. I don't think it's slow or anything, but when the collector is just `count++` the iterator is substantial. It seems like we could frequently avoid the whole thing by implementing `count` in the query cache.



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