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https://issues.apache.org/jira/browse/LUCENE-9361?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17099014#comment-17099014
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Michael McCandless commented on LUCENE-9361:
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Does the query cache also cache scores too now?
> Consider removing CachingCollector
> ----------------------------------
>
> Key: LUCENE-9361
> URL: https://issues.apache.org/jira/browse/LUCENE-9361
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Alan Woodward
> Assignee: Alan Woodward
> Priority: Major
>
> We have a caching collector implementation that is used by the grouping
> module to avoid running queries twice when doing two-phase grouping queries.
> This stores things in a flat array of int[maxDoc], and optionally stores
> scores as well in a parallel float[] array. Given that we have a much more
> efficient way of caching matching documents per-segment in the built-in
> QueryCache, should we consider removing this collector entirely and advise
> users to configure query caches appropriately instead?
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