LRUQueryCache and live docs

Stéphane Campinas <[email protected]> Thu, 24 Jul 2025 11:28:26 +0200

Newsgroups	gmane.comp.jakarta.lucene.devel
Message-ID	<jfv4zhqnnndrh6zuzvp3ewtrbk2u3huurfpgwecpuc5morp3n4@mrox6iv7jmvo>

Hello,

In the bitset cache implementations (in LRUQueryCache), I am wondering
why livedocs aren't passed to the `score` methods used to create
bitsets. See [0] for an example.
My understanding would be that passing livedocs would benefit the
creation of the cached bitset:

- faster search since some docs are deleted
- potentially smaller memory usage, e.g., with the roaring bitset
- potentially smaller cost of the FixedBitset

I have checked the mailing list archive, as well as the commit history,
but found no explanation. Could you explain the reason why livedocs
isn't passed to the `score` method ?

Best,

[0] https://github.com/apache/lucene/blob/7fe43de9f6678b41d8894258e1f99a9f38e87689/lucene/core/src/java/org/apache/lucene/search/LRUQueryCache.java#L539-L553
-- 
Campinas Stephane

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