Robert Muir created LUCENE-10299:
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Summary: investigate prefix/wildcard perf drop in nightly
benchmarks
Key: LUCENE-10299
URL: https://issues.apache.org/jira/browse/LUCENE-10299
Project: Lucene - Core
Issue Type: Task
Environment: Recently the prefix/wildcard dropped. As these are super
simple and not impacted by cleanups being done around RegExp, I think instead
the perf-difference is in the guts of MultiTermQuery where it uses
DocIdSetBuilder?
*note that I haven't confirmed this and it is just a suspicion*
So I think it may be LUCENE-10289 changes? e.g. doing loops with {{long}}
instead of {{int}} like before, we know these are slower in java.
I will admit, I'm a bit confused why we made this change since lucene docids
can only be {{int}}.
Maybe we get the performance back for free, with JDK18/19 which are optimizing
loops on {{long}} better? So I'm not arguing that we burn a bunch of time to
fix this, but just opening the issue.
Reporter: Robert Muir
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