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From "Andrzej Bialecki (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2482) Index sorter
Date Thu, 27 May 2010 21:11:37 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2482?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12872366#action_12872366
] 

Andrzej Bialecki  commented on LUCENE-2482:
-------------------------------------------

Re: combination of fields + a comparator: sure, why not, take a look at the implementation
of the DocScore inner class - you can stuff whatever you want there.

I'm not sure if I follow your use case though ... please remember that this re-sorting is
applied exactly the same to all postings, so savings on one list may cause bloat on another
list.

> Index sorter
> ------------
>
>                 Key: LUCENE-2482
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2482
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: contrib/*
>    Affects Versions: 3.1
>            Reporter: Andrzej Bialecki 
>             Fix For: 3.1
>
>         Attachments: indexSorter.patch
>
>
> A tool to sort index according to a float document weight. Documents with high weight
are given low document numbers, which means that they will be first evaluated. When using
a strategy of "early termination" of queries (see TimeLimitedCollector) such sorting significantly
improves the quality of partial results.
> (Originally this tool was created by Doug Cutting in Nutch, and used norms as document
weights - thus the ordering was limited by the limited resolution of norms. This is a pure
Lucene version of the tool, and it uses arbitrary floats from a specified stored field).

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