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https://issues.apache.org/jira/browse/LUCENE-7365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15357459#comment-15357459
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Adrien Grand commented on LUCENE-7365:
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Yes, exactly.
> Don't use BooleanScorer for small segments
> ------------------------------------------
>
> Key: LUCENE-7365
> URL: https://issues.apache.org/jira/browse/LUCENE-7365
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Alan Woodward
> Assignee: Alan Woodward
> Attachments: LUCENE-7365-query.patch, LUCENE-7365.patch,
> LUCENE-7365.patch
>
>
> If a BooleanQuery meets certain criteria (only contains disjunctions, is
> likely to match large numbers of docs) then we use a BooleanScorer to score
> groups of 1024 docs at a time. This allocates arrays of 1024 Bucket objects
> up-front. On very small segments (for example, a MemoryIndex) this is very
> wasteful of memory, particularly if the query is large or deeply-nested. We
> should avoid using a bulk scorer on these segments.
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