Bruno Roustant created LUCENE-10225:
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Summary: Improve IntroSelector with 3-way partitioning
Key: LUCENE-10225
URL: https://issues.apache.org/jira/browse/LUCENE-10225
Project: Lucene - Core
Issue Type: Improvement
Reporter: Bruno Roustant
The same way we improved IntroSorter, we can improve IntroSelector with
Bentley-McIlroy 3-way partitioning. The gain in performance is roughly the same.
With this new approach, we always use medians-of-medians (Tukey's Ninther), so
there is no real gain to fallback to a slower medians-of-medians technique as
an introspective protection (like the existing implementation does). Instead we
can simply shuffle the sub-range if we exceed the recursive max depth (this
does not change the speed as this intro-protective mechanism almost never
happens - maybe only in adversarial cases).
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