Specialize BooleanQuery if all clauses are TermQueries
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Key: LUCENE-3328
URL: https://issues.apache.org/jira/browse/LUCENE-3328
Project: Lucene - Java
Issue Type: Improvement
Components: core/search
Affects Versions: 3.4, 4.0
Reporter: Simon Willnauer
Fix For: 3.4, 4.0
During work on LUCENE-3319 I ran into issues with BooleanQuery compared to
PhraseQuery in the exact case. If I disable scoring on PhraseQuery and bypass
the position matching, essentially doing a conjunction match, ExactPhraseScorer
beats plain boolean scorer by 40% which is a sizeable gain. I converted a
ConjunctionScorer to use DocsEnum directly but still didn't get all the 40%
from PhraseQuery. Yet, it turned out with further optimizations this gets very
close to PhraseQuery. The biggest gain here came from converting the hand
crafted loop in ConjunctionScorer#doNext to a for loop which seems to be less
confusing to hotspot. In this particular case I think code specialization makes
lots of sense since BQ with TQ is by far one of the most common queries.
I will upload a patch shortly
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