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From "Michael McCandless (JIRA)" <>
Subject [jira] Commented: (LUCENE-2690) Do MultiTermQuery boolean rewrites per segment
Date Sun, 10 Oct 2010 11:24:33 GMT


Michael McCandless commented on LUCENE-2690:

OK I opened LUCENE-2694.

> Do MultiTermQuery boolean rewrites per segment
> ----------------------------------------------
>                 Key: LUCENE-2690
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>    Affects Versions: 4.0
>            Reporter: Uwe Schindler
>            Assignee: Uwe Schindler
>             Fix For: 4.0
>         Attachments: LUCENE-2690-hack.patch, LUCENE-2690.patch, LUCENE-2690.patch, LUCENE-2690.patch,
LUCENE-2690.patch, LUCENE-2690.patch
> MultiTermQuery currently rewrites FuzzyQuery (using TopTermsBooleanQueryRewrite), the
auto constant rewrite method and the ScoringBQ rewrite methods using a MultiFields wrapper
on the top-level reader. This is inefficient.
> This patch changes the rewrite modes to do the rewrites per segment and uses some additional
datastructures (hashed sets/maps) to exclude duplicate terms. All tests currently pass, but
FuzzyQuery's tests should not, because it depends for the minimum score handling, that the
terms are collected in order..
> Robert will fix FuzzyQuery in this issue, too. This patch is just a start.

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