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From "Peter Keegan (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-1017) BoostingTermQuery performance
Date Wed, 03 Oct 2007 00:05:50 GMT
BoostingTermQuery performance
-----------------------------

                 Key: LUCENE-1017
                 URL: https://issues.apache.org/jira/browse/LUCENE-1017
             Project: Lucene - Java
          Issue Type: Improvement
          Components: Search
    Affects Versions: 2.2
         Environment: all
            Reporter: Peter Keegan


I have been experimenting with payloads and BoostingTermQuery, which I think are excellent
additions to Lucene core. Currently, BoostingTermQuery extends SpanQuery. I would suggest
changing this class to extend TermQuery and refactor the current version to something like
'BoostingSpanQuery'.

The reason is rooted in performance. In my testing, I compared query throughput using TermQuery
against 2 versions of BoostingTermQuery - the current one that extends SpanQuery and one that
extends TermQuery (which I've included, below). Here are the results (qps = queries per second):

TermQuery:    200 qps
BoostingTermQuery (extends SpanQuery): 97 qps
BoostingTermQuery (extends TermQuery): 130 qps

Here is a version of BoostingTermQuery that extends TermQuery. I had to modify TermQuery and
TermScorer to make them public. A code review would be in order, and I would appreciate your
comments on this suggestion.

Peter

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