Emmanuel Keller created LUCENE-7588:
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Summary: A parallel DrillSideways implementation
Key: LUCENE-7588
URL: https://issues.apache.org/jira/browse/LUCENE-7588
Project: Lucene - Core
Issue Type: Improvement
Affects Versions: master (7.0), 6.3.1
Reporter: Emmanuel Keller
Priority: Minor
Fix For: master (7.0), 6.3.1
Currently DrillSideways implementation is based on the single threaded
IndexSearcher.search(Query query, Collector results).
On large document set, the single threaded collection can be really slow.
The ParallelDrillSideways implementation could:
1. Use the CollectionManager based method IndexSearcher.search(Query query,
CollectorManager collectorManager) to get the benefits of multithreading on
index segments,
2. Compute each DrillSideway subquery on a single thread.
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