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Posted to dev@lucene.apache.org by "Alan Woodward (JIRA)" <ji...@apache.org> on 2016/06/29 18:30:15 UTC

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

Alan Woodward created LUCENE-7364:
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             Summary: 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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