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Uwe Schindler commented on LUCENE-2690:
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Yes, Mr. No-inlining-Policeman :-)
We are still working on this patch, its marked as TODO, so we will investigate further. For
random queries it had a huge positive impact on query perf. The BQ cloning/reordering was
not measureable. We did this after you left Mike's house, so it was just a quick idea.
> Do MultiTermQuery boolean rewrites per segment
> ----------------------------------------------
>
> Key: LUCENE-2690
> URL: https://issues.apache.org/jira/browse/LUCENE-2690
> Project: Lucene - Java
> Issue Type: Improvement
> Affects Versions: 4.0
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Fix For: 4.0
>
> Attachments: LUCENE-2690-attributes.patch, LUCENE-2690-attributes.patch, LUCENE-2690-attributes.patch,
LUCENE-2690-hack.patch, LUCENE-2690.patch, LUCENE-2690.patch, LUCENE-2690.patch, LUCENE-2690.patch,
LUCENE-2690.patch, LUCENE-2690.patch, LUCENE-2690.patch, LUCENE-2690.patch, LUCENE-2690.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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