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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