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https://issues.apache.org/jira/browse/LUCENE-10120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17420359#comment-17420359
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Adrien Grand commented on LUCENE-10120:
---------------------------------------
FixedBitSet is only used in the case when the Scorer's cost suggests that many
documents match. Otherwise we're using a RoaringBitSet which should already be
quite good at not allocating too much memory up-front, so I'm not sure if the
change that you are proposing would make a noticeable difference.
> Lazy initialize FixedBitSet in LRUQueryCache
> --------------------------------------------
>
> Key: LUCENE-10120
> URL: https://issues.apache.org/jira/browse/LUCENE-10120
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/search
> Affects Versions: main (9.0)
> Reporter: Lu Xugang
> Priority: Major
> Attachments: 1.png
>
>
> Basing on the implement of collecting docIds in DocsWithFieldSet, may be we
> could do similar way to cache docIdSet in
> *LRUQueryCache#cacheIntoBitSet(BulkScorer scorer, int maxDoc)* when docIdSet
> is density.
> In this way , we do not always init a huge FixedBitSet which sometime is not
> necessary when maxDoc is large
>
>
>
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