Alan Woodward created LUCENE-9361:
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Summary: 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
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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