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Posted to dev@lucene.apache.org by "David Smiley (JIRA)" <ji...@apache.org> on 2015/03/25 14:08:53 UTC
[jira] [Updated] (LUCENE-6198) two phase intersection
[ https://issues.apache.org/jira/browse/LUCENE-6198?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
David Smiley updated LUCENE-6198:
---------------------------------
Attachment: LUCENE-6198_move_approximation_to_constructor.patch
This patch moves the approximation to a constructor, as I suggested. It reduces the lines of code wherever a TwoPhaseIterator was defined. I updated the javadocs too. I have yet to run precommit & tests, but assuming they check out; does this look committable?
> two phase intersection
> ----------------------
>
> Key: LUCENE-6198
> URL: https://issues.apache.org/jira/browse/LUCENE-6198
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Robert Muir
> Assignee: David Smiley
> Fix For: Trunk, 5.1
>
> Attachments: LUCENE-6198.patch, LUCENE-6198.patch, LUCENE-6198.patch, LUCENE-6198.patch, LUCENE-6198.patch, LUCENE-6198_move_approximation_to_constructor.patch, phrase_intersections.tasks
>
>
> Currently some scorers have to do a lot of per-document work to determine if a document is a match. The simplest example is a phrase scorer, but there are others (spans, sloppy phrase, geospatial, etc).
> Imagine a conjunction with two MUST clauses, one that is a term that matches all odd documents, another that is a phrase matching all even documents. Today this conjunction will be very expensive, because the zig-zag intersection is reading a ton of useless positions.
> The same problem happens with filteredQuery and anything else that acts like a conjunction.
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