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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