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Date: Thu, 20 Sep 2012 20:58:07 +1100 (NCT)
From: "Simon Willnauer (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Message-ID: <422381909.101673.1348135088393.JavaMail.jiratomcat@arcas>
Subject: [jira] [Created] (LUCENE-4410) Make FilteredQuery more flexible
 with regards to how filters are applied
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Simon Willnauer created LUCENE-4410:
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             Summary: Make FilteredQuery more flexible with regards to how filters are applied
                 Key: LUCENE-4410
                 URL: https://issues.apache.org/jira/browse/LUCENE-4410
             Project: Lucene - Core
          Issue Type: Improvement
          Components: core/search
    Affects Versions: 4.0-BETA
            Reporter: Simon Willnauer
            Priority: Blocker
             Fix For: 5.0, 4.0


Currently FilteredQuery uses either the "old" lucene 3 leap frog approach or pushes the filter down together with accepted docs. Yet there might be more strategies required to fit common usecases like geo-filtering where a rather costly function is applied to each document. Using leap frog this might result in a very slow query if the filter is advanced since it might have linear running time to find the next valid document. We should be more flexible with regards to those usecases and make it possible to either tell FQ what to do or plug in a strategy that applied a filter in a different way.

The current FQ impl also uses an heuristic to decide if RA or LeapFrog should be used. This is really an implementation detail of the strategy and not of FQ and should be moved out.

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