[jira] [Resolved] (LUCENE-7364) Don't use BooleanScorer for small segments

["Hoss Man (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-7364?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hoss Man resolved LUCENE-7364.
------------------------------
    Resolution: Duplicate

> Don't use BooleanScorer for small segments
> ------------------------------------------
>
>                 Key: LUCENE-7364
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7364
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Alan Woodward
>            Assignee: Alan Woodward
>
> 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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