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From "Peter Keegan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1017) BoostingTermQuery performance
Date Wed, 03 Oct 2007 13:22:51 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12532094
] 

Peter Keegan commented on LUCENE-1017:
--------------------------------------

Grant,

You are right about it not handling multiple payloads per document. In fact, I don't think
it's even reading the payloads for all the hits. I'll see what I can do, but feel free to
step in and help me get this right. I won't touch svn for now.

Peter

> 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
>         Attachments: BoostingTermQuery.java, termquery.patch
>
>
> 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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