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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4410) Make FilteredQuery more flexible with regards to how filters are applied
Date Thu, 20 Sep 2012 16:15:07 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13459703#comment-13459703
] 

Uwe Schindler commented on LUCENE-4410:
---------------------------------------

We can only do this, if we add "experimental" to the random access detetion method... Otherwise
we are in backwards-compatibility hell in 4.1

I checked the code, it's identical to the one before, just class hierarchy changed... We can
maybe only remove the new QueryFirstStrategy, but the other one is 100% identical to current
4.0 code. I see no problem with it going in.
                
> 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
>             Fix For: 5.0, 4.0
>
>         Attachments: LUCENE-4410.patch, LUCENE-4410.patch, LUCENE-4410.patch
>
>
> 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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